FSchumacher commented on issue #6090:
URL: https://github.com/apache/jmeter/issues/6090#issuecomment-1781784483
Well, I think I know, what happens. We set the default autocommit value on
the database pool. The pool initializes every connection we borrow from it with
that value. When we set (default) autocommit to true and use the sampler
autocommit (false), we set the autocommit flag for the borrowed connection,
which immediately gets returned (with autocommit false). The next borrow
operation re-sets the autocommit status to the default one.
To work around this behaviour, you can use a JSR 223 Sampler which sets the
default value for autocommit to `null`. That will keep the autocommit status on
the connections through their entire lifetime.
Note, that you will still have to set it for every connection the pool
contains.
The script for a database pool named `db` would look like
```groovy
def dataSource = vars.getObject("db").configuredDataSource
dataSource.defaultAutoCommit = null
dataSource.autoCommitOnReturn = false
```
This script should be the called before any other JDBC Sampler.
I believe the JDBC Connection Config element should allow for `null`(or
empty) value for the default autocommit value.
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