spring ibatis mysql intermittent asynchronous problem

Question

I'm using ibatis in spring to write to mysql.

I have an intermittent bug. On each cycle of a process I write two rows to the db. The next cycle I read in the rows from the previous cycle. Sometimes (one time in 30, sometimes more frequently, sometimes less) I only get back one row from the db.

I have turned off all caching I can think of. My sqlmap-config.xml just says:

<sqlMapConfig>
<settings enhancementEnabled="false" statementCachingEnabled="false" classInfoCacheEnabled="false"/>

<sqlMap resource="ibatis/model/cognitura_core.xml"/>

Is there some asynchrony, or else caching to spring or ibatis or the mysql driver that I'm missing?

Using spring 3.0.5, mybatis 2.3.5, mysql-connector-java 5.0.5

EDIT 1:

Could it be because I'm using a pool of connections (c3p0)? Is it possible the insert is still running when I'm reading. It's weird, though, I thought everything would be occuring synchronously unless I explicitly declared asynch?

Answer 1

Are you calling SqlSession.commit() after the inserts? C3P0 asynchronously "closes" the connections, which may be calling commit under the covers. That could explain the behavior you are seeing.

Answer 2

I'm getting similar behavior. This is what I'm doing. I have an old version of IBATIS I don't plan on upgrading. You can easily move this into a decorator.

SqlMapSession session = client.openSession();
try {
    try {
        session.startTransaction();
        // do work
        session.commitTransaction();
        // The transaction should be committed now, but it doesn't always happen.
        session.getCurrentConnection().commit(); // Commit again :/
    } finally {
        session.endTransaction();
    }
} finally {
    session.close(); // would be nice if it was 'AutoCloseable'
}