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From "Abdul Chaudhry (JIRA)" <>
Subject [jira] Commented: (SOLR-1262) DIH needs support for prepared statements
Date Mon, 20 Jul 2009 06:27:14 GMT


Abdul Chaudhry commented on SOLR-1262:

I could try to use stored procedures instead of trying to get prepared stements to work in
the DIH - however that would mean most of the logic would need to live in SQL and I hate SQL.

> DIH needs support for prepared statements 
> ------------------------------------------
>                 Key: SOLR-1262
>                 URL:
>             Project: Solr
>          Issue Type: Improvement
>          Components: contrib - DataImportHandler
>    Affects Versions: 1.3
>         Environment: linux
> mysql
>            Reporter: Abdul Chaudhry
>            Assignee: Noble Paul
>            Priority: Minor
> During an indexing run we noticed that we were spending a lot of time creating and tearing
down queries in mysql
> The queries we are using are complex and involve joins spanning across multiple tables.
> We should support prepared statements in the data import handler via the data-config.xml
file - for those databases that support prepared statements.
> We could add a new attribute to the entity entity in dataConfig - say - pquery or preparedQuery
and then pass the prepared statement and have values filled in by the actual queries for each
row using a placeholder - like a ? or something else.
> I would probably start by hacking class JdbcDataSource to try a test but was wondering
if anyone had experienced this or had any suggestions or if there is something in the works
that I missed - I couldn't find any other bugs mentioning using prepared statements for performance.

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