By default, DML operations (
INSERT, UPDATE, DELETE) are committed automatically as soon as they are executed.
This is known as auto-commit mode.
You can, however, disable auto-commit mode with the following method call on the Connection object:
conn.setAutoCommit(false);If you disable auto-commit mode, then you must manually commit or roll back changes with the appropriate method call on the
Connection object:
conn.commit( );or conn.rollback( ); |
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COMMIT or ROLLBACK operation affects all DML statements executed since the last COMMIT or ROLLBACK.Note that
- If auto-commit mode is disabled and you close the connection without explicitly committing or rolling back your last changes, then an implicit
COMMIToperation is executed. - Any DDL operation, such as
CREATEorALTER, always includes an implicitCOMMIT. If auto-commit mode is disabled, this implicitCOMMITwill not only commit the DDL statement, but also any pending DML operations that had not yet been explicitly committed or rolled back.
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