If you are currently already in a transaction Drizzle will give a warning
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stating that you are in a transaction in a similar way to PostgreSQL.
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This is instead of implicitly committing the transaction in the way MySQL
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does.
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When https://bugs.launchpad.net/drizzle/+bug/674719 is fixed, Drizzle will have the PostgreSQL like behaviour of giving an error if a transaction is already in progress.