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MySQL 5.7 Reference Manual
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Excerpts from this Manual mysql_rollback()

my_bool mysql_rollback(MYSQL *mysql)


Rolls back the current transaction.

The action of this function is subject to the value of the completion_type system variable. In particular, if the value of completion_type is RELEASE (or 2), the server performs a release after terminating a transaction and closes the client connection. Call mysql_close() from the client program to close the connection from the client side.

Return Values

Zero for success. Nonzero if an error occurred.



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