RE: [nhusers] Re: Inserting a Primary Key value into the database
I'm in the middle of Chapter 5 of the NHibernate 2 Beginner's Guide, specifically the end of page 97. When I try to run the console project, I get the following runtime error at the session.Save line: could not get or update next value[SQL: ] The inner exception is Invalid object name 'hibernate_unique_key'. That error is encountered when I have the generator class set to 'hilo.' did you create the hilo sequence table and insert 1 row in it? You need to do that, as the hilo generator increases an existing row's value. FB I'm currently using a SQL Server 2008 Express database with this project. The tables do NOT have an auto-sequenced number at the moment. When I changed the generator class to increment, I was able to successfully save the object to the database table. Any ideas why 'hilo' isn't good in this situation? (This was the value recommended in the book/associated source code.) Stephen On Thu, Jul 29, 2010 at 10:40 AM, Jason Dentler jasondent...@gmail.com wrote: Frans, Sorry. I was referring to Identity in terms of SQL Server, as this is the database referred to in the NHibernate beginner's book. This particular POID generator, and it's cousin, Native on SQL server require the data to be inserted in order to generate an ID. This breaks batching, as the session.Save, etc. will put data in the database rather than waiting for transaction.Commit (or session.Flush, which IMO, should be considered deprecated when using flush-on-commit, the default) Compare that with hilo, which also doesn't allow duplicates when transactions are used properly, doesn't break batching, and even better, doesn't require a trip to the database for every insert; just one trip to flush the session. As I understand it, on Oracle, native works just fine because it's equivalent to sequence. It does require an extra trip to the database for every insert, but only to fetch an id value, not to insert data. I'm not sure if Identity is available on Oracle, if it has a different meaning than sequence, or if it's just silently converted to sequence. I'm a SQL guy. In any case, I'd like to know what exception Stephen encountered before guessing about the root cause. Thanks, Jason On Thu, Jul 29, 2010 at 10:21 AM, John Davidson jwdavid...@gmail.com wrote: Yes, please create a test and try it John Davidson On Thu, Jul 29, 2010 at 11:18 AM, Frans Bouma fr...@sd.nl wrote: the issue with identity is that it causes two trips to the database for every save of a new record and their are complications with Flush hmm, are you sure? the new identity value is requested by a batched SCOPE_IDENTITY() select right after the insert, same roundtrip as the insert, and it can then immediately be synced with related (fk side) entities. HiLo requires an extra roundtrip for the new value to obtain and insert, as that is required to obtain the new hilo using the sql posted by jason. Or am I missing something? FB John Davidson On Thu, Jul 29, 2010 at 10:51 AM, Frans Bouma fr...@sd.nl wrote: 2 separate clients accessing the same database using HiLo will not grab duplicate hi values. when the next_hi is retrieved by the session factory the following 2 statements are executed. select next_hi from hilo_table (with lock) update hilo_table set next_hi = next_hi + 1 where next_hi = @p0 (with update lock) ...or something like that. between these statements and having the operation within a transaction there is little (if any) chance of 2 factories pulling the same next_hi value. thanks Jason :) It's indeed highly unlikely that the number is issued twice, although I fail to see why this is better than Identity, considering that this table row is locked _alot_ and many
[nhusers] Re: SetFirstResult without SetMaxResult
John, sorry, but you are not in a subject.
On Jul 30, 3:11 am, John Davidson jwdavid...@gmail.com wrote:
Yes, I expect it to get all the Entity items from the database and then
filter it according to your LINQtoObject filter and skip the first ten
records and then return the following ten records. If you want different
behaviour do not use CreateQuery, QueryOver or Query, but use IQueryable.
See the LINQ tests in the NHibernate trunk for more examples of
NHibernateLINQ.
[Category(Paging)]
[Test(Description = This sample uses a where clause and the Skip and Take
operators to select +
the second, third and fourth pages of products)]
public void TriplePageSelection()
{
IQueryableProduct q = (
from p in db.Products
where p.ProductId 1
orderby p.ProductId
select p
);
IQueryableProduct page2 = q.Skip(5).Take(5);
IQueryableProduct page3 = q.Skip(10).Take(5);
IQueryableProduct page4 = q.Skip(15).Take(5);
var firstResultOnPage2 = page2.First();
var firstResultOnPage3 = page3.First();
var firstResultOnPage4 = page4.First();
Assert.AreNotEqual(firstResultOnPage2.ProductId,
firstResultOnPage3.ProductId);
Assert.AreNotEqual(firstResultOnPage3.ProductId,
firstResultOnPage4.ProductId);
Assert.AreNotEqual(firstResultOnPage2.ProductId,
firstResultOnPage4.ProductId);
}
That test will produce output that behaves as you would expect with respect
to the records returned, but your assumptions as to how it does it are
incorrect. The SQL generated to create page2, page3 and page4 objects
follow:
* NHibernate.Test.Linq.MiscellaneousTextFixture.TriplePageSelection
NHibernate:
SELECT
TOP (@p0) ProductId32_,
ProductN2_32_,
SupplierId32_,
CategoryId32_,
Quantity5_32_,
UnitPrice32_,
UnitsInS7_32_,
UnitsOnO8_32_,
ReorderL9_32_,
Discont10_32_
FROM
(select
product0_.ProductId as ProductId32_,
product0_.ProductName as ProductN2_32_,
product0_.SupplierId as SupplierId32_,
product0_.CategoryId as CategoryId32_,
product0_.QuantityPerUnit as Quantity5_32_,
product0_.UnitPrice as UnitPrice32_,
product0_.UnitsInStock as UnitsInS7_32_,
product0_.UnitsOnOrder as UnitsOnO8_32_,
product0_.ReorderLevel as ReorderL9_32_,
product0_.Discontinued as Discont10_32_,
ROW_NUMBER() OVER(
ORDER BY
product0_.ProductId) as __hibernate_sort_row
from
Products product0_
where
product0_.ProductId@p2) as query
WHERE
query.__hibernate_sort_row @p1
ORDER BY
query.__hibernate_sort_row;
@p0 = 1 [Type: Int32 (0)],
@p1 = 5 [Type: Int32 (0)],
@p2 = 1 [Type: Int32 (0)]
NHibernate:
SELECT
TOP (@p0) ProductId32_,
ProductN2_32_,
SupplierId32_,
CategoryId32_,
Quantity5_32_,
UnitPrice32_,
UnitsInS7_32_,
UnitsOnO8_32_,
ReorderL9_32_,
Discont10_32_
FROM
(select
product0_.ProductId as ProductId32_,
product0_.ProductName as ProductN2_32_,
product0_.SupplierId as SupplierId32_,
product0_.CategoryId as CategoryId32_,
product0_.QuantityPerUnit as Quantity5_32_,
product0_.UnitPrice as UnitPrice32_,
product0_.UnitsInStock as UnitsInS7_32_,
product0_.UnitsOnOrder as UnitsOnO8_32_,
product0_.ReorderLevel as ReorderL9_32_,
product0_.Discontinued as Discont10_32_,
ROW_NUMBER() OVER(
ORDER BY
product0_.ProductId) as __hibernate_sort_row
from
Products product0_
where
product0_.ProductId@p2) as query
WHERE
query.__hibernate_sort_row @p1
ORDER BY
query.__hibernate_sort_row;
@p0 = 1 [Type: Int32 (0)],
@p1 = 10 [Type: Int32 (0)],
@p2 = 1 [Type: Int32 (0)]
NHibernate:
SELECT
TOP (@p0) ProductId32_,
ProductN2_32_,
SupplierId32_,
CategoryId32_,
Quantity5_32_,
UnitPrice32_,
UnitsInS7_32_,
UnitsOnO8_32_,
ReorderL9_32_,
Discont10_32_
FROM
(select
product0_.ProductId as ProductId32_,
product0_.ProductName as ProductN2_32_,
product0_.SupplierId as SupplierId32_,
product0_.CategoryId as CategoryId32_,
product0_.QuantityPerUnit as Quantity5_32_,
product0_.UnitPrice as UnitPrice32_,
product0_.UnitsInStock as UnitsInS7_32_,
product0_.UnitsOnOrder as UnitsOnO8_32_,
[nhusers] Dynamic query to DTO
Hi, I am using query object pattern to pass query from the UI to the DAL layer. Then in the DAL, convert the passed query object to the NHibernate criteria. How can I make NHibernate to return DTO object from this type of query? The problem is that the query isn't known in the design time but on the runtime. -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
[nhusers] Re: Dynamic query to DTO
i don't understand very well what you need, with this criteria.SetResultTransformer (new EntityToBeanTransformer(typeof(YourDto)) you can return an object not mapped in the xml, if it's not what you need can explain better what you want? -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
RE: [nhusers] Re: Inserting a Primary Key value into the database
I'd like to comment in general terms... because I saw a few misunderstantings regarding hilo. - The strength of HiLo performance is that Hi values are retrieved per SessionFactory. If you use the default max_lo, it retrieves a value every 32 kibirecords, which is essentialy zero for most OLTP purposes - As noted, collisions are not possible because access to the hilo table uses appropriate locks - If that were an issue, seqhilo is the way to go in databases that support sequences - Identity breaks both batching and UoW. This is explained here: http://fabiomaulo.blogspot.com/2009/02/nh210-generators-behavior- explained.html http://fabiomaulo.blogspot.com/2009/02/nh210-generators-behavior- explained.html - In short, the best generators are hilo/seqhilo and guid.comb. That should be in the docs :-) this list you mean? Absolutely. Looking at the docs of HiLo in march 2010 or so, I concluded that it wasn't really a useful thing to use due to the misinformation, and I didn't build support for it in our nhibernate support in llblgen pro. But after reading this thread and your list, I'll add it today :) Good info all :) Frans Diego On Thu, Jul 29, 2010 at 12:56, Frans Bouma fr...@sd.nl wrote: Sorry. I was referring to Identity in terms of SQL Server, as this is the database referred to in the NHibernate beginner's book. This particular POID generator, and it's cousin, Native on SQL server require the data to be inserted in order to generate an ID. This breaks batching, as the session.Save, etc. will put data in the database rather than waiting for transaction.Commit (or session.Flush, which IMO, should be considered deprecated when using flush-on-commit, the default) Compare that with hilo, which also doesn't allow duplicates when transactions are used properly, doesn't break batching, and even better, doesn't require a trip to the database for every insert; just one trip to flush the session. aha! good point, I totally ignored that, but you're right. HiLo could execute up front, claim X id's and the session could hand those out already, insert everything and that indeed would not require extra roundtrips. So in case of batching: identity fetch makes batching not really useful if table rows with pending fk field syncs are present as the identity value as to be obtained before those rows can be saved. Although one could create extra parameters and still do it in a single trip, but that would require hairy code I guess on the side of the o/r core (read: sql server specific stuff outside the dialect/driver), not what you want) As I understand it, on Oracle, native works just fine because it's equivalent to sequence. It does require an extra trip to the database for every insert, but only to fetch an id value, not to insert data. I'm not sure if Identity is available on Oracle, if it has a different meaning than sequence, or if it's just silently converted to sequence. I'm a SQL guy. yes, for batching, on oracle you have the same problem, although one could create 1 extra batched query which fetches, say for ever entity to save a parameter and a query with a series of batched SELECT :paramX = seq.NEXTVAL FROM DUAL; etc. Not ideal as well. Good point! My crappy test I posted earlier is indeed showing that in non-batching situations, things aren't that happy for HiLo, but for batching, John and you are absolutely right. In any case, I'd like to know what exception Stephen encountered before guessing about the root cause. indeed. Sorry for the side-track. :) FB Thanks, Jason On Thu, Jul 29, 2010 at 10:21 AM, John Davidson jwdavid...@gmail.com wrote: Yes, please create a test and try it John Davidson On Thu, Jul 29, 2010 at 11:18 AM, Frans Bouma fr...@sd.nl wrote: the issue with identity is that it causes two trips to the database for every save of a new record and their are complications with Flush hmm, are you sure? the new identity value is requested by a batched SCOPE_IDENTITY() select right after the insert, same roundtrip as the insert, and it can then immediately be synced with related (fk side) entities. HiLo requires an extra roundtrip for the new value to
[nhusers] Re: NotNull and Unique String
if you need it on the database-side put in the mapping property name=MyStringPropertyName not-null=true unique=true / if you need it on the application-side you need to use a custom validation or an external validation framework (for example see nhibernate.validator) -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
[nhusers] Re: CreateCriteria Issue
try to do that query by hand, maybe in the Profile table you have 72 rows with the same values -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
[nhusers] Re: Dynamic query to DTO
I read that I need to speccify mappings (projections) in the query like this: IList resultWithAliasedBean = s.CreateCriteria(typeof(Enrolment)) .CreateAlias(Student, st) .CreateAlias(Course, co) .SetProjection(Projections.ProjectionList() .Add(Projections.Property(st.Name), studentName) .Add(Projections.Property(co.Description), courseDescription) ) .AddOrder(Order.Desc(studentName)) .SetResultTransformer(NHibernate.Transform.Transformers .AliasToBean(typeof(StudentDTO))) .List(); In this query is visible that I must SetProjections, and Add Projectons (Mapping between DTO and DomainClass). Am I wrong? On Jul 30, 9:44 am, kor korkl...@yahoo.it wrote: i don't understand very well what you need, with this criteria.SetResultTransformer (new EntityToBeanTransformer(typeof(YourDto)) you can return an object not mapped in the xml, if it's not what you need can explain better what you want? -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
[nhusers] NHibernate in Windows Workflow Foundation
I'm looking to use NHibernate as my database access layer inside a WF workflow. At the moment, I have a singleton workflow extension (one per workflow service host) which holds the session factory. However, I ran into a problem trying to implement a CurrentSessionContext provider - there doesn't seem to be an easy way to obtain the workflow instance of the current thread. I've resorted to using a thread-local session context (my own implementation using .NET 4.0's ThreadLocalT - which is an IDisposable - does the SessionFactory support IDisposable CurrentSessionContext providers?) for the time being, but I suspect that's fragile and likely to break for the same reasons as in ASP.NET. I've also implemented a CurrentSessionContext provider using the InstanceContext of the current WCF OperationContext, but that's not useful in WF since workflows can execute outside the context of a WCF operation. -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
[nhusers] Where to report bugs about db2hbm? ManyToOneStrategy.WireManyToOnes gives an exception.
I've not been able to figure out where to file a bug report for db2hbm. I've found a bug in either db2hbm or SQL Server 2005. The problem is that the SQL code in MSSQLForeignKeyCrawler.GetForeignKeyColumns doesn't return any rows for some FKs. I've got this FK in my DB: ALTER TABLE [dbo].[verConsecutiveEntityVersion] WITH CHECK ADD CONSTRAINT [FKAUTO_verConsecutiveEntityVersion_verDataSet_UsesDataSetSid_DataSetExists] FOREIGN KEY([UsesDataSetSid], [IsOfEntityTypeNumber]) REFERENCES [dbo].[verDataSet] ([Sid], [IsForEntityTypeNumber]) When using the INFORMATION_SCHEMA to find it, the UNIQUE_CONSTRAINT_NAME returns 'UX_verDataSet', which is not present in INFORMATION_SCHEMA.KEY_COLUMN_USAGE and the inner join for KCU2 does not match anything, later leading to an exception in ManyToOneStrategy.WireManyToOnes: string referredTable = keyManyToOne.First().PrimaryKeyTableName; I changed the SQL to: SELECT f.name AS 'FK_CONSTRAINT_NAME', OBJECT_NAME(f.parent_object_id) AS 'FK_TABLE_NAME', @p1 AS 'FK_TABLE_CATALOG', OBJECT_SCHEMA_NAME(f.parent_object_id) AS 'FK_TABLE_SCHEMA', COL_NAME(fc.parent_object_id, fc.parent_column_id) AS 'FK_COLUMN_NAME', fc.constraint_column_id AS 'FK_ORDINAL_POSITION', NULL AS 'UQ_CONSTRAINT_NAME', OBJECT_NAME(f.referenced_object_id) AS 'UQ_TABLE_NAME', @p1 AS 'UQ_TABLE_CATALOG', OBJECT_SCHEMA_NAME(f.parent_object_id) AS 'UQ_TABLE_SCHEMA', COL_NAME(fc.referenced_object_id, fc.referenced_column_id) AS 'UQ_COLUMN_NAME', fc.referenced_column_id AS 'UQ_ORDINAL_POSITION' FROM sys.foreign_keys AS f LEFT JOIN sys.foreign_key_columns AS fc ON f.OBJECT_ID = fc.constraint_object_id WHERE f.na...@p0 AND SCHEMA_NAME(f.schema_id) = @p2 and changed the code for the query to change to the correct database. This seemed to work for me, but I know too little about SQL Server to know if this is close to correct (and the returned NULL value is obviously not correct). -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
[nhusers] Re: Inserting a Primary Key value into the database
@Stephen did you allow NH to generate the db schema for you, or are you trying to retro fit a legacy database to use hilo? When you select the hilo PIOD strategy it expects the actual table you are mapping to and a second table where the HiLo seed is stored by default it's named hibernate_unique_key with a single column max_lo. you can over ride the table name and column name if you want. for example I override the table name for each entity that uses hilo. this way each entity has it's own set of high low values. otherwise all entities get there max_lo seed from the same table. if this isn't enough to help you solve the problem please start another thread. On Jul 30, 12:25 am, Stephen Karl skarl...@gmail.com wrote: Hi Jason, I'm in the middle of Chapter 5 of the NHibernate 2 Beginner's Guide, specifically the end of page 97. When I try to run the console project, I get the following runtime error at the session.Save line: could not get or update next value[SQL: ] The inner exception is Invalid object name 'hibernate_unique_key'. That error is encountered when I have the generator class set to 'hilo.' I'm currently using a SQL Server 2008 Express database with this project. The tables do NOT have an auto-sequenced number at the moment. When I changed the generator class to increment, I was able to successfully save the object to the database table. Any ideas why 'hilo' isn't good in this situation? (This was the value recommended in the book/associated source code.) Stephen On Thu, Jul 29, 2010 at 10:40 AM, Jason Dentler jasondent...@gmail.comwrote: Frans, Sorry. I was referring to Identity in terms of SQL Server, as this is the database referred to in the NHibernate beginner's book. This particular POID generator, and it's cousin, Native on SQL server require the data to be inserted in order to generate an ID. This breaks batching, as the session.Save, etc. will put data in the database rather than waiting for transaction.Commit (or session.Flush, which IMO, should be considered deprecated when using flush-on-commit, the default) Compare that with hilo, which also doesn't allow duplicates when transactions are used properly, doesn't break batching, and even better, doesn't require a trip to the database for every insert; just one trip to flush the session. As I understand it, on Oracle, native works just fine because it's equivalent to sequence. It does require an extra trip to the database for every insert, but only to fetch an id value, not to insert data. I'm not sure if Identity is available on Oracle, if it has a different meaning than sequence, or if it's just silently converted to sequence. I'm a SQL guy. In any case, I'd like to know what exception Stephen encountered before guessing about the root cause. Thanks, Jason On Thu, Jul 29, 2010 at 10:21 AM, John Davidson jwdavid...@gmail.comwrote: Yes, please create a test and try it John Davidson On Thu, Jul 29, 2010 at 11:18 AM, Frans Bouma fr...@sd.nl wrote: the issue with identity is that it causes two trips to the database for every save of a new record and their are complications with Flush hmm, are you sure? the new identity value is requested by a batched SCOPE_IDENTITY() select right after the insert, same roundtrip as the insert, and it can then immediately be synced with related (fk side) entities. HiLo requires an extra roundtrip for the new value to obtain and insert, as that is required to obtain the new hilo using the sql posted by jason. Or am I missing something? FB John Davidson On Thu, Jul 29, 2010 at 10:51 AM, Frans Bouma fr...@sd.nl wrote: 2 separate clients accessing the same database using HiLo will not grab duplicate hi values. when the next_hi is retrieved by the session factory the following 2 statements are executed. select next_hi from hilo_table (with lock) update hilo_table set next_hi = next_hi + 1 where next_hi = @p0 (with update lock) ...or something like that. between these statements and having the operation within a transaction there is little (if any) chance of 2 factories pulling the same next_hi value. thanks Jason :) It's indeed highly unlikely that the number is issued twice, although I fail to see why this is better than Identity, considering that this table row is locked _alot_ and many inserts thus will have a serious impact on performance here. On Oracle for example, you can achieve the same thing by using the same sequence on all tables, without the penalty. :) FB On Jul 29, 10:15 am, Frans Bouma fr...@sd.nl wrote: hilo uses a lock to ensure 2 factories don't pull the same hi value. a
Re: [nhusers] Re: Inserting a Primary Key value into the database
Hi Stephen, Thanks for pointing this out. It is an oversight in the book. You see, the drafts of the book used Identity. However, for the reasons pointed out previously, we (the book's technical reviewers) strongly suggested the author switch to hilo. Because the book takes the database first approach (I'm not a fan of this approach, by the way), the schema isn't generated from the model mappings. It's built by hand. When the author switched the book from Identity to Hilo, he failed to add the necessary steps for creating the hilo table. The fix is simple. You can manually create the table as Frans suggested. Alternatively, as Jason M suggested, use hbm2ddl to generate your database schema. The hilo table will be included. Either will accomplish our goal. Thanks, Jason On Fri, Jul 30, 2010 at 5:52 AM, Jason Meckley jasonmeck...@gmail.comwrote: @Stephen did you allow NH to generate the db schema for you, or are you trying to retro fit a legacy database to use hilo? When you select the hilo PIOD strategy it expects the actual table you are mapping to and a second table where the HiLo seed is stored by default it's named hibernate_unique_key with a single column max_lo. you can over ride the table name and column name if you want. for example I override the table name for each entity that uses hilo. this way each entity has it's own set of high low values. otherwise all entities get there max_lo seed from the same table. if this isn't enough to help you solve the problem please start another thread. On Jul 30, 12:25 am, Stephen Karl skarl...@gmail.com wrote: Hi Jason, I'm in the middle of Chapter 5 of the NHibernate 2 Beginner's Guide, specifically the end of page 97. When I try to run the console project, I get the following runtime error at the session.Save line: could not get or update next value[SQL: ] The inner exception is Invalid object name 'hibernate_unique_key'. That error is encountered when I have the generator class set to 'hilo.' I'm currently using a SQL Server 2008 Express database with this project. The tables do NOT have an auto-sequenced number at the moment. When I changed the generator class to increment, I was able to successfully save the object to the database table. Any ideas why 'hilo' isn't good in this situation? (This was the value recommended in the book/associated source code.) Stephen On Thu, Jul 29, 2010 at 10:40 AM, Jason Dentler jasondent...@gmail.com wrote: Frans, Sorry. I was referring to Identity in terms of SQL Server, as this is the database referred to in the NHibernate beginner's book. This particular POID generator, and it's cousin, Native on SQL server require the data to be inserted in order to generate an ID. This breaks batching, as the session.Save, etc. will put data in the database rather than waiting for transaction.Commit (or session.Flush, which IMO, should be considered deprecated when using flush-on-commit, the default) Compare that with hilo, which also doesn't allow duplicates when transactions are used properly, doesn't break batching, and even better, doesn't require a trip to the database for every insert; just one trip to flush the session. As I understand it, on Oracle, native works just fine because it's equivalent to sequence. It does require an extra trip to the database for every insert, but only to fetch an id value, not to insert data. I'm not sure if Identity is available on Oracle, if it has a different meaning than sequence, or if it's just silently converted to sequence. I'm a SQL guy. In any case, I'd like to know what exception Stephen encountered before guessing about the root cause. Thanks, Jason On Thu, Jul 29, 2010 at 10:21 AM, John Davidson jwdavid...@gmail.com wrote: Yes, please create a test and try it John Davidson On Thu, Jul 29, 2010 at 11:18 AM, Frans Bouma fr...@sd.nl wrote: the issue with identity is that it causes two trips to the database for every save of a new record and their are complications with Flush hmm, are you sure? the new identity value is requested by a batched SCOPE_IDENTITY() select right after the insert, same roundtrip as the insert, and it can then immediately be synced with related (fk side) entities. HiLo requires an extra roundtrip for the new value to obtain and insert, as that is required to obtain the new hilo using the sql posted by jason. Or am I missing something? FB John Davidson On Thu, Jul 29, 2010 at 10:51 AM, Frans Bouma fr...@sd.nl wrote: 2 separate clients accessing the same database using HiLo will not grab duplicate hi values. when the next_hi is retrieved by the session factory the following 2 statements are executed. select next_hi from hilo_table (with
[nhusers] Re: CreateCriteria Issue
When the query is run by hand against Oracle - it returns 72 unique rows. I am a newby with NHibernate and can't figure out what is wrong with the statement. All the examples that I look at seem to be written the same way. On Jul 30, 3:52 am, kor korkl...@yahoo.it wrote: try to do that query by hand, maybe in the Profile table you have 72 rows with the same values -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
RE: [nhusers] Re: CreateCriteria Issue
When you run this in Oracle, what do you get back? SELECT this_.USER_ID as USER1_12_0_, this_.RIGHTS_ID as RIGHTS2_12_0_, this_.FUNCTIONAL_AREA as FUNCTIONAL3_12_0_, this_.PERM_RIGHTS_ID as PERM4_12_0_ FROM PROFILE this_ WHERE this_.USER_ID = 7943 Rippo -Original Message- From: nhusers@googlegroups.com [mailto:nhus...@googlegroups.com] On Behalf Of William Sent: 30 July 2010 13:29 To: nhusers Subject: [nhusers] Re: CreateCriteria Issue When the query is run by hand against Oracle - it returns 72 unique rows. I am a newby with NHibernate and can't figure out what is wrong with the statement. All the examples that I look at seem to be written the same way. On Jul 30, 3:52 am, kor korkl...@yahoo.it wrote: try to do that query by hand, maybe in the Profile table you have 72 rows with the same values -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en. -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
[nhusers] Re: CreateCriteria Issue
When run in Oracle I get 72 records for User id = 7943. The functional areas are all unique. In the table each user id has 72 entries to cover the areas of the application. The query returns the proper records, but for some reason when I run it in the code - I am only getting the first entry 72 times. On Jul 30, 9:00 am, Richard Wilde rich...@wildesoft.net wrote: When you run this in Oracle, what do you get back? SELECT this_.USER_ID as USER1_12_0_, this_.RIGHTS_ID as RIGHTS2_12_0_, this_.FUNCTIONAL_AREA as FUNCTIONAL3_12_0_, this_.PERM_RIGHTS_ID as PERM4_12_0_ FROM PROFILE this_ WHERE this_.USER_ID = 7943 Rippo -Original Message- From: nhusers@googlegroups.com [mailto:nhus...@googlegroups.com] On Behalf Of William Sent: 30 July 2010 13:29 To: nhusers Subject: [nhusers] Re: CreateCriteria Issue When the query is run by hand against Oracle - it returns 72 unique rows. I am a newby with NHibernate and can't figure out what is wrong with the statement. All the examples that I look at seem to be written the same way. On Jul 30, 3:52 am, kor korkl...@yahoo.it wrote: try to do that query by hand, maybe in the Profile table you have 72 rows with the same values -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group athttp://groups.google.com/group/nhusers?hl=en.- Hide quoted text - - Show quoted text - -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
AW: [nhusers] How to map an objectified Many to Many relationship?
Hi Fabio, would you like to post an example here? I am trying the same thing ;-) Michael Von: nhusers@googlegroups.com [mailto:nhus...@googlegroups.com] Im Auftrag von Fabio Maulo Gesendet: Montag, 26. Juli 2010 16:53 An: nhusers@googlegroups.com Betreff: Re: [nhusers] How to map an objectified Many to Many relationship? Frans. Can you send me a private mail with classes and scrip to create tables ? Please simplified I'll then add the Order.Products readonly collection. btw have a look to loader On Mon, Jul 26, 2010 at 11:41 AM, Frans Bouma fr...@sd.nl wrote: Hi, Consider Northwind. It has several objectified many to many (m:n) relationships: Customer m:n Employee (via Order) and Order m:n Product (via OrderDetails). 'objectified relationship' is a NIAM/ORM (object role modeling) term, see http://www.orm.net, and it means that a m:n relationship on itself is an entity with its own attributes (fields). In the examples above, Order and OrderDetails are normal entities with non-pk fields. So let's pick Order m:n Product in Northwind. This relationship is defined on two m:1 relationships: - OrderDetails m:1 Order and - OrderDetails m:1 Product I can define for each entity a class and map it into their table in Northwind, define the two m:1 relationships as well and all is well. But I also want to define the m:n relationship Order m:n Product, so I can fetch the products of an order without fetching Order Details and without the necessity of formulating the joins, like: var products = myOrder.Products; which, through lazy loading, should create a query like (I use '*' but you get the idea) SELECT DISTINCT p.* FROMProducts p INNER JOIN [Order Details] od ON p.ProductId = od.ProductId INNER JOIN Orders o ON od.OrderId = o.OrderId WHERE o.OrderId = @orderId (yes this can be made more efficient, that's irrelevant now) My o/r mapper supports this, also in queries with filters etc. and my designer does as well. I wanted to support these relationships for NHibernate in my designer as well, but couldn't find any info about how to map Order.Products in such a way that I get the above query. I only could find information about mapping a 'pure' m:n relationship, so with an intermediate table which isn't an entity and doesn't have a class mapped onto it. Typical example of a pure m:n relationship: User m:n Group, where a 3rd, 'hidden', table is present in the db, UserGroup, which has two m:1 relationships, and only PK fields which are the FK fields to resp. User and Group. So, my questions are: 1) is mapping Order.Products supported in NHibernate? 2) if so, how to map Order.Products ? I know that Order.Products is 'readonly' as adding a product there requires an OrderDetails instance as well, so this might be the reason it's _not_ supported, but I'd like to know for sure. TIA, Frans Lead developer of LLBLGen Pro, .NET's most advanced O/R mapping designer. LLBLGen Pro website: http://www.llblgen.com Blog: http://weblogs.asp.net/fbouma Twitter: http://twitter.com/FransBouma Microsoft MVP (C#). -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com mailto:nhusers%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/nhusers?hl=en. -- Fabio Maulo -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en. -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
[nhusers] Re: CreateCriteria Issue
when you do the test and call this code return Session .CreateCriteriaProfile() .Add(Restrictions.Eq(UserId, id)) .ListProfile(); this is the only code that you calls? i mean that before it you don't work with nhibernate session and that after you check directly the list that has been returnd by ListProfile()? the returned items have the same id or different id but the same values? do you use same 2-level cache? -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
[nhusers] Many-to-one relationship do not delete orphan children.
Hi all, I can't see why the orphans doesn't get delete, when cascade is set to all in the many-to-one xml-element. I have this mapping of an aggregate entity (table test_aggregates) and child entity (table test_reference_entities): hibernate-mapping xmlns=urn:nhibernate-mapping-2.2 default- access=property auto-import=true default-cascade=save-update default-lazy=false class xmlns=urn:nhibernate-mapping-2.2 lazy=false mutable=true name=TestAggregate, Tests, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null table=test_aggregates id access=backfield name=Id type=System.Int64, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 column name=id / generator class=hilo param name=max_lo100/param /generator /id many-to-one cascade=all class=Namic.Being.Framework.Tests.Database.TestReferenceEntity, Namic.Being.Framework.Tests, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null name=ReferenceEntity column name=ReferenceEntity_id / /many-to-one /class /hibernate-mapping hibernate-mapping xmlns=urn:nhibernate-mapping-2.2 default- access=property auto-import=true default-cascade=save-update default-lazy=false class xmlns=urn:nhibernate-mapping-2.2 lazy=false mutable=true name=TestReferenceEntity, Tests, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null table=test_reference_entities id access=backfield name=Id type=System.Int64, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 column name=id / generator class=hilo param name=max_lo100/param /generator /id /class /hibernate-mapping Cheers! -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
[nhusers] Optimizing too many joins
[I posted that to old NH Users forum too (https://forum.hibernate.org/ viewtopic.php?f=25t=1006127) - sorry for double post, just realized you moved here...] Hello, I have quite complex database model, an Ad has a collection of Details, every Detail has reference to Parameter, a Parameter belongs to a Group and to a Field. A Field has OptionItems and Units. OptionItem, Unit and a Group have Translations collection. There are more relations, but these mentioned above are the most relevant. I need to get efficiently full object graph for specific Ad. My solution gets it in one query, but there are too many joins and I get a cartesian product. My query: [code] var ad = _session.CreateCriteriaAd(ad) //Address with Country and Country Translations .CreateAlias(Address, address, JoinType.LeftOuterJoin) .SetFetchMode(address, FetchMode.Eager) .CreateAlias(address.Country, country, JoinType.LeftOuterJoin) .SetFetchMode(country, FetchMode.Eager) .CreateAlias(country.Translations, countryTranslations, JoinType.LeftOuterJoin) .SetFetchMode(countryTranslations, FetchMode.Eager) //Details .CreateAlias(Details, details, JoinType.LeftOuterJoin) .SetFetchMode(details, FetchMode.Eager) //Parameter .CreateAlias(details.Parameter, parameter, JoinType.LeftOuterJoin) .SetFetchMode(parameter, FetchMode.Eager) //Group with Translations .CreateAlias(parameter.Group, group, JoinType.LeftOuterJoin) .SetFetchMode(group, FetchMode.Eager) .CreateAlias(group.Translations, groupTranslations, JoinType.LeftOuterJoin) .SetFetchMode(groupTranslations, FetchMode.Eager) //Field .CreateAlias(parameter.Field, field, JoinType.LeftOuterJoin) .SetFetchMode(field, FetchMode.Eager) .CreateAlias(field.Translations, fieldTranslations, JoinType.LeftOuterJoin) .SetFetchMode(fieldTranslations, FetchMode.Eager) //OptionItems with translations .CreateAlias(field.OptionItems, optionItems, JoinType.LeftOuterJoin) .SetFetchMode(optionItems, FetchMode.Eager) .CreateAlias(optionItems.Translations, optionItemTranslations, JoinType.LeftOuterJoin) .SetFetchMode(optionItemTranslations, FetchMode.Eager) //Units with translations .CreateAlias(field.Units, unit, JoinType.LeftOuterJoin) .SetFetchMode(unit, FetchMode.Eager) .CreateAlias(unit.Translations, unitTranslations, JoinType.LeftOuterJoin) .SetFetchMode(unitTranslations, FetchMode.Eager) .CreateAlias(Images, images, JoinType.LeftOuterJoin) .SetFetchMode(images, FetchMode.Eager) .CreateAlias(Make, make, JoinType.LeftOuterJoin) .SetFetchMode(make, FetchMode.Eager) .CreateAlias(make.Models, model, JoinType.LeftOuterJoin) .SetFetchMode(model, FetchMode.Eager) .SetResultTransformer(new DistinctRootEntityResultTransformer()) .Add(Restrictions.Eq(Id, id)) .UniqueResultAd(); [/code] As you can see it gets huge... And not really efficient. Any ideas how to optimize it using NHibernate? Thanks in advance. Marek -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
[nhusers] Re: Optimizing too many joins
Have you seen this post http://ayende.com/Blog/archive/2010/01/16/eagerly-loading-entity-associations-efficiently-with-nhibernate.aspx I used this technique with pretty good success. On Jul 30, 10:21 am, marek marek.stach...@googlemail.com wrote: [I posted that to old NH Users forum too (https://forum.hibernate.org/ viewtopic.php?f=25t=1006127) - sorry for double post, just realized you moved here...] Hello, I have quite complex database model, an Ad has a collection of Details, every Detail has reference to Parameter, a Parameter belongs to a Group and to a Field. A Field has OptionItems and Units. OptionItem, Unit and a Group have Translations collection. There are more relations, but these mentioned above are the most relevant. I need to get efficiently full object graph for specific Ad. My solution gets it in one query, but there are too many joins and I get a cartesian product. My query: [code] var ad = _session.CreateCriteriaAd(ad) //Address with Country and Country Translations .CreateAlias(Address, address, JoinType.LeftOuterJoin) .SetFetchMode(address, FetchMode.Eager) .CreateAlias(address.Country, country, JoinType.LeftOuterJoin) .SetFetchMode(country, FetchMode.Eager) .CreateAlias(country.Translations, countryTranslations, JoinType.LeftOuterJoin) .SetFetchMode(countryTranslations, FetchMode.Eager) //Details .CreateAlias(Details, details, JoinType.LeftOuterJoin) .SetFetchMode(details, FetchMode.Eager) //Parameter .CreateAlias(details.Parameter, parameter, JoinType.LeftOuterJoin) .SetFetchMode(parameter, FetchMode.Eager) //Group with Translations .CreateAlias(parameter.Group, group, JoinType.LeftOuterJoin) .SetFetchMode(group, FetchMode.Eager) .CreateAlias(group.Translations, groupTranslations, JoinType.LeftOuterJoin) .SetFetchMode(groupTranslations, FetchMode.Eager) //Field .CreateAlias(parameter.Field, field, JoinType.LeftOuterJoin) .SetFetchMode(field, FetchMode.Eager) .CreateAlias(field.Translations, fieldTranslations, JoinType.LeftOuterJoin) .SetFetchMode(fieldTranslations, FetchMode.Eager) //OptionItems with translations .CreateAlias(field.OptionItems, optionItems, JoinType.LeftOuterJoin) .SetFetchMode(optionItems, FetchMode.Eager) .CreateAlias(optionItems.Translations, optionItemTranslations, JoinType.LeftOuterJoin) .SetFetchMode(optionItemTranslations, FetchMode.Eager) //Units with translations .CreateAlias(field.Units, unit, JoinType.LeftOuterJoin) .SetFetchMode(unit, FetchMode.Eager) .CreateAlias(unit.Translations, unitTranslations, JoinType.LeftOuterJoin) .SetFetchMode(unitTranslations, FetchMode.Eager) .CreateAlias(Images, images, JoinType.LeftOuterJoin) .SetFetchMode(images, FetchMode.Eager) .CreateAlias(Make, make, JoinType.LeftOuterJoin) .SetFetchMode(make, FetchMode.Eager) .CreateAlias(make.Models, model, JoinType.LeftOuterJoin) .SetFetchMode(model, FetchMode.Eager) .SetResultTransformer(new DistinctRootEntityResultTransformer()) .Add(Restrictions.Eq(Id, id)) .UniqueResultAd(); [/code] As you can see it gets huge... And not really efficient. Any ideas how to optimize it using NHibernate? Thanks in advance. Marek -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
Re: [nhusers] Re: Dynamic query to DTO
Luka, are you using Criteria even for static queries ? On Fri, Jul 30, 2010 at 7:32 AM, Luka cluk...@gmail.com wrote: I read that I need to speccify mappings (projections) in the query like this: IList resultWithAliasedBean = s.CreateCriteria(typeof(Enrolment)) .CreateAlias(Student, st) .CreateAlias(Course, co) .SetProjection(Projections.ProjectionList() .Add(Projections.Property(st.Name), studentName) .Add(Projections.Property(co.Description), courseDescription) ) .AddOrder(Order.Desc(studentName)) .SetResultTransformer(NHibernate.Transform.Transformers .AliasToBean(typeof(StudentDTO))) .List(); In this query is visible that I must SetProjections, and Add Projectons (Mapping between DTO and DomainClass). Am I wrong? On Jul 30, 9:44 am, kor korkl...@yahoo.it wrote: i don't understand very well what you need, with this criteria.SetResultTransformer (new EntityToBeanTransformer(typeof(YourDto)) you can return an object not mapped in the xml, if it's not what you need can explain better what you want? -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.comnhusers%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/nhusers?hl=en. -- Fabio Maulo -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
Re: [nhusers] CreateCriteria Issue
Class impl, please. On Thu, Jul 29, 2010 at 12:01 PM, William wlangb...@paychex.com wrote: I am having an issue with query below: return Session .CreateCriteriaProfile() .Add(Restrictions.Eq(UserId, id)) .ListProfile(); This should return 72 records from a table based on the User Id. What is being returned to the c# is 72 copies of the first record. Here is the query that NUnit is indicating is being run: SELECT this_.USER_ID as USER1_12_0_, this_.RIGHTS_ID as RIGHTS2_12_0_, this_.FUNCTIONAL_AREA as FUNCTIONAL3_12_0_, this_.PERM_RIGHTS_ID as PERM4_12_0_ FROM PROFILE this_ WHERE this_.USER_ID = :p0;:p0 = 7943 -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.comnhusers%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/nhusers?hl=en. -- Fabio Maulo -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
[nhusers] Re: Possible to map some properties on entity from json column
bumpety-bump!
On Jul 26, 10:49 am, mcintyre321 mcintyre...@gmail.com wrote:
I want to be able to add new properties to an entity without having to
define schema for them, and have them all persist to a single db
column.
Unless I'm mistaken about their capabilities, I'm not sure an
IUserType is what I'm after - I previously wrote an XML serialized
generic UserType before, but what that did was map 1 property - 1 db
column. I want to map n properties to 1 column.
On Jul 23, 6:30 pm, Fabio Maulo fabioma...@gmail.com wrote:
No Jason... it is very easy... IUserType
Note: He said map some properties of an entity
On Fri, Jul 23, 2010 at 1:23 PM, Jason Dentler
jasondent...@gmail.comwrote:
I'm sure you can do this with some seriously heavy lifting, like writing a
custom persister, but it would be easier to map this to some field in your
entity and then parse it.
On Fri, Jul 23, 2010 at 11:15 AM,mcintyre321mcintyre...@gmail.comwrote:
I've been wondering if its possible to have NH map some properties on
an entity from a schema-free json (or xml) column
e.g. map a db table like
Id, Name, Json
1, Marmaduke, {address1: Windsor Castle, address2: London }
to a class like
class Person{
int Id{get;set;}
string Name {get;set;}
string Address1 {get;set;}
string Address2 {get;set;}
}
Is there a way to do this, or an extension point I could use to enable
this?
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Re: [nhusers] Re: Possible to map some properties on entity from json column
Can you send a simple class and its persistent representation ?
thanks.
On Mon, Jul 26, 2010 at 6:49 AM, mcintyre321 mcintyre...@gmail.com wrote:
I want to be able to add new properties to an entity without having to
define schema for them, and have them all persist to a single db
column.
Unless I'm mistaken about their capabilities, I'm not sure an
IUserType is what I'm after - I previously wrote an XML serialized
generic UserType before, but what that did was map 1 property - 1 db
column. I want to map n properties to 1 column.
On Jul 23, 6:30 pm, Fabio Maulo fabioma...@gmail.com wrote:
No Jason... it is very easy... IUserType
Note: He said map some properties of an entity
On Fri, Jul 23, 2010 at 1:23 PM, Jason Dentler jasondent...@gmail.com
wrote:
I'm sure you can do this with some seriously heavy lifting, like
writing a
custom persister, but it would be easier to map this to some field in
your
entity and then parse it.
On Fri, Jul 23, 2010 at 11:15 AM, mcintyre321 mcintyre...@gmail.com
wrote:
I've been wondering if its possible to have NH map some properties on
an entity from a schema-free json (or xml) column
e.g. map a db table like
Id, Name, Json
1, Marmaduke, {address1: Windsor Castle, address2: London }
to a class like
class Person{
int Id{get;set;}
string Name {get;set;}
string Address1 {get;set;}
string Address2 {get;set;}
}
Is there a way to do this, or an extension point I could use to enable
this?
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Re: [nhusers] How to map an objectified Many to Many relationship?
What you are trying to do exactly ? On Fri, Jul 30, 2010 at 10:24 AM, Michael Möhle moehl...@googlemail.comwrote: Hi Fabio, would you like to post an example here? I am trying the same thing ;-) Michael *Von:* nhusers@googlegroups.com [mailto:nhus...@googlegroups.com] *Im Auftrag von *Fabio Maulo *Gesendet:* Montag, 26. Juli 2010 16:53 *An:* nhusers@googlegroups.com *Betreff:* Re: [nhusers] How to map an objectified Many to Many relationship? Frans. Can you send me a private mail with classes and scrip to create tables ? Please simplified I'll then add the Order.Products readonly collection. btw have a look to loader On Mon, Jul 26, 2010 at 11:41 AM, Frans Bouma fr...@sd.nl wrote: Hi, Consider Northwind. It has several objectified many to many (m:n) relationships: Customer m:n Employee (via Order) and Order m:n Product (via OrderDetails). 'objectified relationship' is a NIAM/ORM (object role modeling) term, see http://www.orm.net, and it means that a m:n relationship on itself is an entity with its own attributes (fields). In the examples above, Order and OrderDetails are normal entities with non-pk fields. So let's pick Order m:n Product in Northwind. This relationship is defined on two m:1 relationships: - OrderDetails m:1 Order and - OrderDetails m:1 Product I can define for each entity a class and map it into their table in Northwind, define the two m:1 relationships as well and all is well. But I also want to define the m:n relationship Order m:n Product, so I can fetch the products of an order without fetching Order Details and without the necessity of formulating the joins, like: var products = myOrder.Products; which, through lazy loading, should create a query like (I use '*' but you get the idea) SELECT DISTINCT p.* FROMProducts p INNER JOIN [Order Details] od ON p.ProductId = od.ProductId INNER JOIN Orders o ON od.OrderId = o.OrderId WHERE o.OrderId = @orderId (yes this can be made more efficient, that's irrelevant now) My o/r mapper supports this, also in queries with filters etc. and my designer does as well. I wanted to support these relationships for NHibernate in my designer as well, but couldn't find any info about how to map Order.Products in such a way that I get the above query. I only could find information about mapping a 'pure' m:n relationship, so with an intermediate table which isn't an entity and doesn't have a class mapped onto it. Typical example of a pure m:n relationship: User m:n Group, where a 3rd, 'hidden', table is present in the db, UserGroup, which has two m:1 relationships, and only PK fields which are the FK fields to resp. User and Group. So, my questions are: 1) is mapping Order.Products supported in NHibernate? 2) if so, how to map Order.Products ? I know that Order.Products is 'readonly' as adding a product there requires an OrderDetails instance as well, so this might be the reason it's _not_ supported, but I'd like to know for sure. TIA, Frans Lead developer of LLBLGen Pro, .NET's most advanced O/R mapping designer. LLBLGen Pro website: http://www.llblgen.com Blog: http://weblogs.asp.net/fbouma Twitter: http://twitter.com/FransBouma Microsoft MVP (C#). -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.comnhusers%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/nhusers?hl=en. -- Fabio Maulo -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.comnhusers%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/nhusers?hl=en. -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.comnhusers%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/nhusers?hl=en. -- Fabio Maulo -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
[nhusers] Re: CreateCriteria Issue
The more research that I am doing into this is leading me to believe
that my mapping file is the problem. Here is what I have:
public class ProfileMap : ClassMapProfile
{
public ProfileMap()
{
Id(x = x.UserId)
.Column(USER_ID)
.Not.Nullable();
Map(x = x.RightsId)
.Column(RIGHTS_ID)
.Not.Nullable();
Map(x = x.FunctionalArea)
.Column(FUNCTIONAL_AREA)
.Not.Nullable();
Map(x = x.PermanentRightsId)
.Column(PERM_RIGHTS_ID)
.Nullable();
}
}
Here is the entity:
public class Profile
{
public virtual long UserId { get; set; }
public virtual int RightsId { get; set; }
public virtual string FunctionalArea { get; set; }
public virtual int PermanentRightsId { get; set; }
}
When I run my query using HQL the results are the same. That is why I
am now thinking the issue is with the mapping, but I haven't yet found
any mapping examples that differ all that much.
On Jul 30, 11:48 am, Fabio Maulo fabioma...@gmail.com wrote:
Class impl, please.
On Thu, Jul 29, 2010 at 12:01 PM, William wlangb...@paychex.com wrote:
I am having an issue with query below:
return Session
.CreateCriteriaProfile()
.Add(Restrictions.Eq(UserId, id))
.ListProfile();
This should return 72 records from a table based on the User Id. What
is being returned to the c# is 72 copies of the first record. Here is
the query that NUnit is indicating is being run:
SELECT this_.USER_ID as USER1_12_0_, this_.RIGHTS_ID as RIGHTS2_12_0_,
this_.FUNCTIONAL_AREA as FUNCTIONAL3_12_0_, this_.PERM_RIGHTS_ID as
PERM4_12_0_ FROM PROFILE this_ WHERE this_.USER_ID = :p0;:p0 = 7943
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Re: [nhusers] Understanding Proxy Objects
http://ayende.com/Blog/archive/2009/09/03/answer-the-lazy-loaded-inheritance-many-to-one-association-orm.aspx
Diego
On Wed, Jul 28, 2010 at 10:14, alexey_baranov mias...@gmail.com wrote:
Hi!
I have simple class hierarchy. One superclass Obj and few subclasses
class Obj{
public virtual string TypeName=Object;
}
class Person: Obj{
public override string TypeName=Person;
}
class Request:Obj{
public override string TypeName=Servise request
public virtual Obj Initier{get;set;} //Initier can be any Obj
subclass like Person, Client, ...
}
In my code I have persisted Request inctance
request= new Request{ Initier= new Person() };
sess.Save(request);
After loading this object back I have strange things:
request.Initier.GetType().FullName == ObjProxyae6
request.Initier.GetType().IsSubclassOf(typeof(Obj)) == true // so it
is subclass of Obj
request.Initier.GetType().IsSubclassOf(typeof(Person)) == false // it
is not subclass of Person
request.Initier.TypeName==Person // !!! I suppost it should be
Object
The question is: if ObjProxyae6. is not subclass of Person, why
does it return TypeName==Person not Object?
Thanks!
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[nhusers] Re: NotNull and Unique String
I´m using NotNull:= false and Unique:=true. The problem occur when i save an object that has empty string. On 30 jul, 04:48, kor korkl...@yahoo.it wrote: if you need it on the database-side put in the mapping property name=MyStringPropertyName not-null=true unique=true / if you need it on the application-side you need to use a custom validation or an external validation framework (for example see nhibernate.validator) -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
[nhusers] Re: Many-to-one relationship do not delete orphan children.
cascade=all-delete-orphan -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
[nhusers] linq child filtering
I am using the nhibernate 3 alpha and have this basics query
var query = from record in session.QueryRecord()
from brwSet in session.QueryBorrowerSet()
from brw in session.QueryBorrower()
where
brw.PrintOrder == 1 brwSet.PrintOrder ==
0
record.Package.BorrowerSet.Contains( brwSet )
brwSet.Borrower.Contains( brw )
select new Summary()
{
BorrowerFirstName =
brw.Contact.FirstName,
BorrowerLastName =
brw.Contact.LastName,
LoanPackageID = record.Id
};
I would like to find a way to remove the two contains calls any
suggestions?
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Re: [nhusers] Re: Many-to-one relationship do not delete orphan children.
On 30.7.2010 22:09, Aaron Fischer wrote: cascade=all-delete-orphan As far as I remember, orphan delete is only supported for collections. Sergej -- You received this message because you are subscribed to the Google Groups nhusers group. To post to this group, send email to nhus...@googlegroups.com. To unsubscribe from this group, send email to nhusers+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/nhusers?hl=en.
RE: [nhusers] linq child filtering
I am using the nhibernate 3 alpha and have this basics query
var query = from record in session.QueryRecord()
from brwSet in session.QueryBorrowerSet()
from brw in session.QueryBorrower()
where
brw.PrintOrder == 1 brwSet.PrintOrder ==
0
record.Package.BorrowerSet.Contains( brwSet )
brwSet.Borrower.Contains( brw )
select new Summary()
{
BorrowerFirstName = brw.Contact.FirstName,
BorrowerLastName = brw.Contact.LastName,
LoanPackageID = record.Id
};
I would like to find a way to remove the two contains calls any
suggestions?
IMHO it would require joins, which are IMHO less efficient, as
Contains should generate an EXISTS(correlated subquery) query which is
easier to optimize (and doesn't runs the risk of creating a larger temp set
due to joins).
Is there a reason why you'd want to remove the contains?
FB
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[nhusers] Re: How to map an objectified Many to Many relationship?
Sorry, for my stupidy, but im following this discussion in my mail client. And it seems, that i did not get got all answers here. Please forget my question at all. With the hints from you and Frans i could solve my Problem! Michael On Jul 30, 9:32 pm, Michael Möhle moehl...@googlemail.com wrote: I have an entity Artikel: class name=Artikel table=artikel id name=Nr column =nr type=int access =nosetter.pascalcase-m-underscore generator class =sequence param name=sequenceartikel_nr_seq/param /generator /id property type=int name=ArtikelNr column=artikelnr access =nosetter.pascalcase-m-underscore not-null=true/ property type=string length=16 name=BarcodeString column=barcode access =nosetter.pascalcase-m-underscore/ property type=string length=80 name=NameEnglisch1 column=nameenglisch1 access =nosetter.pascalcase-m-underscore/ property type=string length=60 name =NameEnglisch2 column=nameenglisch2 access =nosetter.pascalcase-m-underscore/ . . . bag name=Auftraege inverse=true lazy=true access =nosetter.pascalcase-m-underscore key/ many-to-many class =Auftrag/ loader query-ref =ArtikelAuftrag/ /bag /class An entity Auftrag: class name=Auftrag table=auftrag1 lazy=true id name=Nr column =nr type=int access =nosetter.pascalcase-m-underscore generator class =sequence param name=sequenceauftrag1_seq/param /generator /id property type=int name=AuftragNr column=nr2 access =nosetter.pascalcase-m-underscore not-null=true/ property type=int name=Jahr column=jahr access =nosetter.pascalcase-m-underscore not-null=true/ property type=date name=Datum column=datum access =nosetter.pascalcase-m-underscore/ . . . bag name=AuftragDetails inverse=true lazy=true cascade=all access =nosetter.pascalcase-m-underscore order-by =artikelnrzusatz asc key column=nrhaupt / one-to-many class=AuftragDetails / /bag /class An entity Auftragdetails: class name=AuftragDetails table=auftrag2 lazy=true id name=Nr column=nr type=int access =nosetter.pascalcase-m-underscore generator class=sequence param name=sequenceauftrag2_seq/param /generator /id property type=int name=Jahr column=jahr access =nosetter.pascalcase-m-underscore/ property type=int name=ZeilenNr column=zeilennr access =nosetter.pascalcase-m-underscore/ many-to-one name=Auftrag cascade=none class=Auftrag column=nrhaupt access =nosetter.pascalcase-m-underscore / many-to-one name=Artikel cascade=none class=Artikel column=artikelnr access =nosetter.pascalcase-m-underscore / property type=int name=ArtikelNr column=artikelnrzusatz access =nosetter.pascalcase-m-underscore / . . . /class And my problem is the Bag in Artikel (Auftraege). I want all “Auftraege” where the “Artikel” is on. (Maybe reduced to Offene Auftraege(open orders), but this is the next step ;-) Here is the the loading sql: sql-query name =ArtikelAuftrag read-only =true return alias =at1 class =Auftrag lock-mode =read/ select at1.* from auftrag1 at1 inner join auftrag2 at2 ON at1.nr=at2.nrhaupt and (at2.artikelnr=?) /sql-query The error message is: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt. (null reference?) StackTrace = bei NHibernate.Collection.PersistentBag.get_Count() bei NHibernate.DebugHelpers.CollectionProxy`1.get_Items() Any hints are welcome! Von: nhusers@googlegroups.com [mailto:nhus...@googlegroups.com] Im Auftrag von Fabio Maulo Gesendet: Freitag, 30. Juli 2010 20:23 An: nhusers@googlegroups.com Betreff: Re: [nhusers] How to map an objectified Many to Many relationship? What you are trying to do exactly ? On Fri, Jul 30, 2010 at 10:24 AM, Michael Möhle moehl...@googlemail.com wrote: Hi Fabio, would you like to post an example here? I am trying the same thing ;-) Michael Von: nhusers@googlegroups.com [mailto:nhus...@googlegroups.com] Im Auftrag von Fabio Maulo Gesendet: Montag, 26. Juli 2010 16:53 An: nhusers@googlegroups.com Betreff: Re: [nhusers] How to map an objectified Many to Many relationship? Frans. Can you send me a private mail with classes and scrip to create tables ? Please simplified I'll then add the Order.Products readonly collection. btw have a look to loader On Mon, Jul 26, 2010 at 11:41 AM, Frans Bouma fr...@sd.nl wrote: Hi, Consider Northwind. It has several objectified many to many (m:n) relationships: Customer m:n Employee (via Order) and Order m:n Product (via OrderDetails). 'objectified relationship' is a NIAM/ORM (object role modeling) term, seehttp://www.orm.net, and it means that a m:n relationship on itself is an entity with its own attributes (fields). In the examples above, Order and OrderDetails are normal entities with non-pk fields. So let's pick
Re: [nhusers] Re: Inserting a Primary Key value into the database
@Jason Meckley I am not sure how to allow NHibernate to generate the database schema at this point. I created the database and tables first and then built the program. Also, I had no clue that a separate HiLo table was needed. Do you link the HiLo table to a particular table or do you just need one HiLo table period for a database? Stephen On Fri, Jul 30, 2010 at 5:52 AM, Jason Meckley jasonmeck...@gmail.comwrote: @Stephen did you allow NH to generate the db schema for you, or are you trying to retro fit a legacy database to use hilo? When you select the hilo PIOD strategy it expects the actual table you are mapping to and a second table where the HiLo seed is stored by default it's named hibernate_unique_key with a single column max_lo. you can over ride the table name and column name if you want. for example I override the table name for each entity that uses hilo. this way each entity has it's own set of high low values. otherwise all entities get there max_lo seed from the same table. if this isn't enough to help you solve the problem please start another thread. On Jul 30, 12:25 am, Stephen Karl skarl...@gmail.com wrote: Hi Jason, I'm in the middle of Chapter 5 of the NHibernate 2 Beginner's Guide, specifically the end of page 97. When I try to run the console project, I get the following runtime error at the session.Save line: could not get or update next value[SQL: ] The inner exception is Invalid object name 'hibernate_unique_key'. That error is encountered when I have the generator class set to 'hilo.' I'm currently using a SQL Server 2008 Express database with this project. The tables do NOT have an auto-sequenced number at the moment. When I changed the generator class to increment, I was able to successfully save the object to the database table. Any ideas why 'hilo' isn't good in this situation? (This was the value recommended in the book/associated source code.) Stephen On Thu, Jul 29, 2010 at 10:40 AM, Jason Dentler jasondent...@gmail.com wrote: Frans, Sorry. I was referring to Identity in terms of SQL Server, as this is the database referred to in the NHibernate beginner's book. This particular POID generator, and it's cousin, Native on SQL server require the data to be inserted in order to generate an ID. This breaks batching, as the session.Save, etc. will put data in the database rather than waiting for transaction.Commit (or session.Flush, which IMO, should be considered deprecated when using flush-on-commit, the default) Compare that with hilo, which also doesn't allow duplicates when transactions are used properly, doesn't break batching, and even better, doesn't require a trip to the database for every insert; just one trip to flush the session. As I understand it, on Oracle, native works just fine because it's equivalent to sequence. It does require an extra trip to the database for every insert, but only to fetch an id value, not to insert data. I'm not sure if Identity is available on Oracle, if it has a different meaning than sequence, or if it's just silently converted to sequence. I'm a SQL guy. In any case, I'd like to know what exception Stephen encountered before guessing about the root cause. Thanks, Jason On Thu, Jul 29, 2010 at 10:21 AM, John Davidson jwdavid...@gmail.com wrote: Yes, please create a test and try it John Davidson On Thu, Jul 29, 2010 at 11:18 AM, Frans Bouma fr...@sd.nl wrote: the issue with identity is that it causes two trips to the database for every save of a new record and their are complications with Flush hmm, are you sure? the new identity value is requested by a batched SCOPE_IDENTITY() select right after the insert, same roundtrip as the insert, and it can then immediately be synced with related (fk side) entities. HiLo requires an extra roundtrip for the new value to obtain and insert, as that is required to obtain the new hilo using the sql posted by jason. Or am I missing something? FB John Davidson On Thu, Jul 29, 2010 at 10:51 AM, Frans Bouma fr...@sd.nl wrote: 2 separate clients accessing the same database using HiLo will not grab duplicate hi values. when the next_hi is retrieved by the session factory the following 2 statements are executed. select next_hi from hilo_table (with lock) update hilo_table set next_hi = next_hi + 1 where next_hi = @p0 (with update lock) ...or something like that. between these statements and having the operation within a transaction there is little (if any) chance of 2 factories pulling the same next_hi value. thanks Jason :) It's indeed highly unlikely that the number is
