Re: Combine two table caches to expose a database view type cache?
Muthu,
You can use binary representation instead of POJO classes [1]. I think it
can help you to avoid boilerplate code.
1.
https://apacheignite.readme.io/docs/binary-marshaller#binaryobject-cache-api
On Mon, Jun 5, 2017 at 10:18 PM, Muthu <muthu.kumara...@gmail.com> wrote:
> Our current application code uses this view in several places. We use
> MyBatis for ORM & it generates the DTO object & everything. The thought is
> if there is way to transparently use Ignite cache for the view instead of
> going to the database & let the rest of the application code use the same
> DTO object as generated by MyBatis.
>
> Regards,
> Muthu
>
> On Mon, Jun 5, 2017 at 12:10 PM, Muthu <muthu.kumara...@gmail.com> wrote:
>
>>
>> Thanks Nikolai for the suggestion..one other thing i was thinking was to
>> use continuous queries feature to create & update the new cache...but the
>> problem is i still have to manually construct the resultant DTO object
>> (manually set every field in the code). Since this is a view that joins two
>> or three tables with lots of columns i was wondering if there was a way i
>> can auto generate this boiler plate code...
>>
>> Regards,
>> Muthu
>>
>> On Mon, Jun 5, 2017 at 5:44 AM, Nikolai Tikhonov <ntikho...@apache.org>
>> wrote:
>>
>>> Hello,
>>>
>>> You need to implement your own CacheStore which will execute several
>>> selects for one entry and combine two rows to one cache entry.
>>>
>>> On Thu, Jun 1, 2017 at 9:34 AM, Muthu <muthu.kumara...@gmail.com> wrote:
>>>
>>>> Hello Folks,
>>>>
>>>> Just to add a little bit more clarity & context...taking the
>>>> Cross-Cache querying example from the ignite docs (copied below) if one
>>>> were to select fields from both Person & Organization table caches in the
>>>> select query what would be the elegant way to construct a domain POJO from
>>>> the query result set instead of constructing it in the application code.
>>>>
>>>>
>>>>- Cross-Cache SqlFieldsQuery
>>>><https://apacheignite.readme.io/docs/sql-queries>
>>>>
>>>> // In this example, suppose Person objects are stored in a // cache named
>>>> 'personCache' and Organization objects // are stored in a cache named
>>>> 'orgCache'.IgniteCache<Long, Person> personCache =
>>>> ignite.cache("personCache");
>>>> // Select with join between Person and Organization to // get the names of
>>>> all the employees of a specific organization.SqlFieldsQuery sql = new
>>>> SqlFieldsQuery(
>>>> "select Person.name "
>>>> + "from Person as p, \"orgCache\".Organization as org where "
>>>> + "p.orgId = org.id "
>>>> + "and org.name = ?");
>>>> // Execute the query and obtain the query result cursor.try
>>>> (QueryCursor<List> cursor = personCache.query(sql.setArgs("Ignite"))) {
>>>> for (List row : cursor)
>>>> System.out.println("Person name=" + row.get(0));
>>>> }
>>>>
>>>>
>>>> Regards,
>>>> Muthu
>>>>
>>>> -- The latest fact in modern technology isn't that machines will begin
>>>> to think like people, but that people will begin to think like machines.
>>>> -- Nothing exists except atoms and empty space, everything else is
>>>> opinion - *Democritus*
>>>>
>>>> On Tue, May 30, 2017 at 4:26 PM, Muthu <muthu.kumara...@gmail.com>
>>>> wrote:
>>>>
>>>>>
>>>>> Just to clarify a little bit i don't want the view created on the
>>>>> database but rather created & exposed purely in ignite. The individual
>>>>> tables are already cached & available as L2 cache (MyBatis L2 cache) in
>>>>> Ignite.
>>>>>
>>>>> Regards,
>>>>> Muthu
>>>>>
>>>>>
>>>>> On Tue, May 30, 2017 at 4:07 PM, Muthu <muthu.kumara...@gmail.com>
>>>>> wrote:
>>>>>
>>>>>> Hi Folks,
>>>>>>
>>>>>> I need to combine two table caches to expose a database view type
>>>>>> cache. Is there an elegant way to do this where i don't need to manually
>>>>>> set/construct the view's POJO from the result of the join query?
>>>>>>
>>>>>> Regards,
>>>>>> Muthu
>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>
Re: Combine two table caches to expose a database view type cache?
Our current application code uses this view in several places. We use
MyBatis for ORM & it generates the DTO object & everything. The thought is
if there is way to transparently use Ignite cache for the view instead of
going to the database & let the rest of the application code use the same
DTO object as generated by MyBatis.
Regards,
Muthu
On Mon, Jun 5, 2017 at 12:10 PM, Muthu <muthu.kumara...@gmail.com> wrote:
>
> Thanks Nikolai for the suggestion..one other thing i was thinking was to
> use continuous queries feature to create & update the new cache...but the
> problem is i still have to manually construct the resultant DTO object
> (manually set every field in the code). Since this is a view that joins two
> or three tables with lots of columns i was wondering if there was a way i
> can auto generate this boiler plate code...
>
> Regards,
> Muthu
>
> On Mon, Jun 5, 2017 at 5:44 AM, Nikolai Tikhonov <ntikho...@apache.org>
> wrote:
>
>> Hello,
>>
>> You need to implement your own CacheStore which will execute several
>> selects for one entry and combine two rows to one cache entry.
>>
>> On Thu, Jun 1, 2017 at 9:34 AM, Muthu <muthu.kumara...@gmail.com> wrote:
>>
>>> Hello Folks,
>>>
>>> Just to add a little bit more clarity & context...taking the Cross-Cache
>>> querying example from the ignite docs (copied below) if one were to select
>>> fields from both Person & Organization table caches in the select query
>>> what would be the elegant way to construct a domain POJO from the query
>>> result set instead of constructing it in the application code.
>>>
>>>
>>>- Cross-Cache SqlFieldsQuery
>>><https://apacheignite.readme.io/docs/sql-queries>
>>>
>>> // In this example, suppose Person objects are stored in a // cache named
>>> 'personCache' and Organization objects // are stored in a cache named
>>> 'orgCache'.IgniteCache<Long, Person> personCache =
>>> ignite.cache("personCache");
>>> // Select with join between Person and Organization to // get the names of
>>> all the employees of a specific organization.SqlFieldsQuery sql = new
>>> SqlFieldsQuery(
>>> "select Person.name "
>>> + "from Person as p, \"orgCache\".Organization as org where "
>>> + "p.orgId = org.id "
>>> + "and org.name = ?");
>>> // Execute the query and obtain the query result cursor.try
>>> (QueryCursor<List> cursor = personCache.query(sql.setArgs("Ignite"))) {
>>> for (List row : cursor)
>>> System.out.println("Person name=" + row.get(0));
>>> }
>>>
>>>
>>> Regards,
>>> Muthu
>>>
>>> -- The latest fact in modern technology isn't that machines will begin
>>> to think like people, but that people will begin to think like machines.
>>> -- Nothing exists except atoms and empty space, everything else is
>>> opinion - *Democritus*
>>>
>>> On Tue, May 30, 2017 at 4:26 PM, Muthu <muthu.kumara...@gmail.com>
>>> wrote:
>>>
>>>>
>>>> Just to clarify a little bit i don't want the view created on the
>>>> database but rather created & exposed purely in ignite. The individual
>>>> tables are already cached & available as L2 cache (MyBatis L2 cache) in
>>>> Ignite.
>>>>
>>>> Regards,
>>>> Muthu
>>>>
>>>>
>>>> On Tue, May 30, 2017 at 4:07 PM, Muthu <muthu.kumara...@gmail.com>
>>>> wrote:
>>>>
>>>>> Hi Folks,
>>>>>
>>>>> I need to combine two table caches to expose a database view type
>>>>> cache. Is there an elegant way to do this where i don't need to manually
>>>>> set/construct the view's POJO from the result of the join query?
>>>>>
>>>>> Regards,
>>>>> Muthu
>>>>>
>>>>>
>>>>
>>>
>>
>
Re: Combine two table caches to expose a database view type cache?
Thanks Nikolai for the suggestion..one other thing i was thinking was to
use continuous queries feature to create & update the new cache...but the
problem is i still have to manually construct the resultant DTO object
(manually set every field in the code). Since this is a view that joins two
or three tables with lots of columns i was wondering if there was a way i
can auto generate this boiler plate code...
Regards,
Muthu
On Mon, Jun 5, 2017 at 5:44 AM, Nikolai Tikhonov <ntikho...@apache.org>
wrote:
> Hello,
>
> You need to implement your own CacheStore which will execute several
> selects for one entry and combine two rows to one cache entry.
>
> On Thu, Jun 1, 2017 at 9:34 AM, Muthu <muthu.kumara...@gmail.com> wrote:
>
>> Hello Folks,
>>
>> Just to add a little bit more clarity & context...taking the Cross-Cache
>> querying example from the ignite docs (copied below) if one were to select
>> fields from both Person & Organization table caches in the select query
>> what would be the elegant way to construct a domain POJO from the query
>> result set instead of constructing it in the application code.
>>
>>
>>- Cross-Cache SqlFieldsQuery
>><https://apacheignite.readme.io/docs/sql-queries>
>>
>> // In this example, suppose Person objects are stored in a // cache named
>> 'personCache' and Organization objects // are stored in a cache named
>> 'orgCache'.IgniteCache<Long, Person> personCache =
>> ignite.cache("personCache");
>> // Select with join between Person and Organization to // get the names of
>> all the employees of a specific organization.SqlFieldsQuery sql = new
>> SqlFieldsQuery(
>> "select Person.name "
>> + "from Person as p, \"orgCache\".Organization as org where "
>> + "p.orgId = org.id "
>> + "and org.name = ?");
>> // Execute the query and obtain the query result cursor.try
>> (QueryCursor<List> cursor = personCache.query(sql.setArgs("Ignite"))) {
>> for (List row : cursor)
>> System.out.println("Person name=" + row.get(0));
>> }
>>
>>
>> Regards,
>> Muthu
>>
>> -- The latest fact in modern technology isn't that machines will begin to
>> think like people, but that people will begin to think like machines.
>> -- Nothing exists except atoms and empty space, everything else is
>> opinion - *Democritus*
>>
>> On Tue, May 30, 2017 at 4:26 PM, Muthu <muthu.kumara...@gmail.com> wrote:
>>
>>>
>>> Just to clarify a little bit i don't want the view created on the
>>> database but rather created & exposed purely in ignite. The individual
>>> tables are already cached & available as L2 cache (MyBatis L2 cache) in
>>> Ignite.
>>>
>>> Regards,
>>> Muthu
>>>
>>>
>>> On Tue, May 30, 2017 at 4:07 PM, Muthu <muthu.kumara...@gmail.com>
>>> wrote:
>>>
>>>> Hi Folks,
>>>>
>>>> I need to combine two table caches to expose a database view type
>>>> cache. Is there an elegant way to do this where i don't need to manually
>>>> set/construct the view's POJO from the result of the join query?
>>>>
>>>> Regards,
>>>> Muthu
>>>>
>>>>
>>>
>>
>
Re: Combine two table caches to expose a database view type cache?
Hello,
You need to implement your own CacheStore which will execute several
selects for one entry and combine two rows to one cache entry.
On Thu, Jun 1, 2017 at 9:34 AM, Muthu <muthu.kumara...@gmail.com> wrote:
> Hello Folks,
>
> Just to add a little bit more clarity & context...taking the Cross-Cache
> querying example from the ignite docs (copied below) if one were to select
> fields from both Person & Organization table caches in the select query
> what would be the elegant way to construct a domain POJO from the query
> result set instead of constructing it in the application code.
>
>
>- Cross-Cache SqlFieldsQuery
><https://apacheignite.readme.io/docs/sql-queries>
>
> // In this example, suppose Person objects are stored in a // cache named
> 'personCache' and Organization objects // are stored in a cache named
> 'orgCache'.IgniteCache<Long, Person> personCache =
> ignite.cache("personCache");
> // Select with join between Person and Organization to // get the names of
> all the employees of a specific organization.SqlFieldsQuery sql = new
> SqlFieldsQuery(
> "select Person.name "
> + "from Person as p, \"orgCache\".Organization as org where "
> + "p.orgId = org.id "
> + "and org.name = ?");
> // Execute the query and obtain the query result cursor.try
> (QueryCursor<List> cursor = personCache.query(sql.setArgs("Ignite"))) {
> for (List row : cursor)
> System.out.println("Person name=" + row.get(0));
> }
>
>
> Regards,
> Muthu
>
> -- The latest fact in modern technology isn't that machines will begin to
> think like people, but that people will begin to think like machines.
> -- Nothing exists except atoms and empty space, everything else is opinion
> - *Democritus*
>
> On Tue, May 30, 2017 at 4:26 PM, Muthu <muthu.kumara...@gmail.com> wrote:
>
>>
>> Just to clarify a little bit i don't want the view created on the
>> database but rather created & exposed purely in ignite. The individual
>> tables are already cached & available as L2 cache (MyBatis L2 cache) in
>> Ignite.
>>
>> Regards,
>> Muthu
>>
>>
>> On Tue, May 30, 2017 at 4:07 PM, Muthu <muthu.kumara...@gmail.com> wrote:
>>
>>> Hi Folks,
>>>
>>> I need to combine two table caches to expose a database view type cache.
>>> Is there an elegant way to do this where i don't need to manually
>>> set/construct the view's POJO from the result of the join query?
>>>
>>> Regards,
>>> Muthu
>>>
>>>
>>
>
Re: Combine two table caches to expose a database view type cache?
Just to clarify a little bit i don't want the view created on the database but rather created & exposed purely in ignite. The individual tables are already cached & available as L2 cache (MyBatis L2 cache) in Ignite. Regards, Muthu On Tue, May 30, 2017 at 4:07 PM, Muthu <muthu.kumara...@gmail.com> wrote: > Hi Folks, > > I need to combine two table caches to expose a database view type cache. > Is there an elegant way to do this where i don't need to manually > set/construct the view's POJO from the result of the join query? > > Regards, > Muthu > >
Combine two table caches to expose a database view type cache?
Hi Folks, I need to combine two table caches to expose a database view type cache. Is there an elegant way to do this where i don't need to manually set/construct the view's POJO from the result of the join query? Regards, Muthu
