Re: [GENERAL] PostgreSQL and Crystal Report
On 05/09/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > > Hi All. > I've the necessity to use Crystal Report in my C++ project to report (in > PDF) some PostgreSQL table. > Any idea how to implement this functionality in my C++ project, or where I > can find some useful CR documentation? > All the Crystal Report documentation I found is about VisualBasic or C# > API. > > Thanks in advance. > > Luca. > Luca, Good luck in getting a license from Crystal Reports. They set us a license which didn't work (gave invalid id error). They spent over a week insisting that the license was valid and us telling them that it didn't. We gave up on them and went to Jasper Reports. In many ways it's a better product. Crystal Reports also couldn't give us assurance that they would support Postgresql. Jasper works great with it. We are using Jasper Server as well for delivery of our reports and I think it's a great product. I've used the Java API into Jasper - I've no knowledge of what the C++ API would be like to it though. Rob
Re: [GENERAL] Data Warehousing
Andrej Ricnik-Bay wrote: On 9/3/07, Rob Kirkbride <[EMAIL PROTECTED]> wrote: We're using hibernate to write to the database. Partitioning looks like it will be too much of a re-architecture. In reply to Andrej we do have a logged_time entity in the required tables. That being the case how does that help me with the tools provided? Might I have to write a custom JDBC application to do the data migration? That would be one option :} If the server is on a Unix/Linux-platform you should be able to achieve the result with a reasonably simple shell-script and cron, I'd say. I am on a Linux platform but I'm going to need some pointers regarding the cron job. Are you suggesting that I parse the dump file? I assume I would need to switch to using inserts and then parse the dump looking for where I need to start from? ---(end of broadcast)--- TIP 2: Don't 'kill -9' the postmaster
Re: [GENERAL] Data Warehousing
On 03/09/07, Scott Marlowe <[EMAIL PROTECTED]> wrote: > > On 9/3/07, Rob Kirkbride <[EMAIL PROTECTED]> wrote: > > Hi, > > > > I've got a postgres database collected logged data. This data I have to > keep > > for at least 3 years. The data in the first instance is being recorded > in a > > postgres cluster. This then needs to be moved a reports database server > for > > analysis. Therefore I'd like a job to dump data on the cluster say every > > hour and record this is in the reports database. The clustered database > > could be purged of say data more than a week old. > > > > So basically I need a dump/restore that only appends new data to the > reports > > server database. > > > > I've googled but can't find anything, can anyone help? > > You might find an answer in partitioning your data. There's a section > in the docs on it. Then you can just dump the old data from the > newest couple of partitions if you're partitioning by week, and dump > anything older with a simple delete where date < now() - interval '1 > week' or something like that. We're using hibernate to write to the database. Partitioning looks like it will be too much of a re-architecture. In reply to Andrej we do have a logged_time entity in the required tables. That being the case how does that help me with the tools provided? Might I have to write a custom JDBC application to do the data migration? Rob
[GENERAL] Data Warehousing
Hi, I've got a postgres database collected logged data. This data I have to keep for at least 3 years. The data in the first instance is being recorded in a postgres cluster. This then needs to be moved a reports database server for analysis. Therefore I'd like a job to dump data on the cluster say every hour and record this is in the reports database. The clustered database could be purged of say data more than a week old. So basically I need a dump/restore that only appends new data to the reports server database. I've googled but can't find anything, can anyone help? Thanks Rob
Re: [GENERAL] Optimising Union Query.
Jim C. Nasby wrote on 25/04/2005 01:28: On Sat, Apr 23, 2005 at 10:39:14PM +, Patrick TJ McPhee wrote: In article <[EMAIL PROTECTED]>, Rob Kirkbride <[EMAIL PROTECTED]> wrote: % I've done a explain analyze and as I expected the database has to check % every row in each of the three tables below but I'm wondering if I can This is because you're returning a row for every row in the three tables. % select l.name,l.id from pa i,locations l where i.location=l.id union % select l.name,l.id from andu i,locations l where i.location=l.id union % select l.name,l.id from idu i,locations l where i.location=l.id; You might get some improvement from select name,id from locations where id in (select distinct location from pa union select distinct location from andu union select distinct location from idu); Note that SELECT DISTINCT is redundant with a plain UNION. By definition, UNION does a DISTINCT. In fact, this is going to hurt you; you'll end up doing 4 distinct operations (one for each SELECT DISTINCT and one for the overall UNION). Unless some of those tables have a lot of duplicated location values, you should either use UNION ALLs or drop the DISTINCTs. Note that going with DISTINCTs is different than what your original query does. You should also consider this: SELECT name, id FROM locations l WHERE EXISTS (SELECT * FROM pa p WHERE p.location=l.id) OR EXISTS (SELECT * FROM andu a WHERE a.location=l.id) OR EXISTS (SELECT * FROM idu i WHERE i.location=l.id) This query would definately be helped by having indexes on (pa|andu|idu).location. Thanks for that. I tried a few things, including using DISTINCTS and UNION ALLs but none made a big difference. However your query above sped things up by a factor of more than 2. Thanks very much! Rob ---(end of broadcast)--- TIP 4: Don't 'kill -9' the postmaster
[GENERAL] Optimising Union Query.
Hi, I've got a query that takes quite some time to complete. I'm not an SQL expert so I'm not sure how to improve things. I've done a explain analyze and as I expected the database has to check every row in each of the three tables below but I'm wondering if I can do it much quicker by a use of an index or something. Each of the three tables could have several thousand entries in. Basically the tables contain data recorded against time then every hour a script deletes entries that more than so many hours old. select l.name,l.id from pa i,locations l where i.location=l.id union select l.name,l.id from andu i,locations l where i.location=l.id union select l.name,l.id from idu i,locations l where i.location=l.id; Thanks for any help, Rob ---(end of broadcast)--- TIP 6: Have you searched our list archives? http://archives.postgresql.org
[GENERAL] Time
Hi, I'm trying to fetch out the epoch value of a time, the data type is 'timestamp with time zone'. When I do select extract(epoch from time) it returns a fractional part as well. Am I doing this the correct way? Is the fractional part microseconds? Thanks for any help, Rob ---(end of broadcast)--- TIP 7: don't forget to increase your free space map settings
