(PECL ibm_db2 >= 1.0.0)
db2_commit — Commits a transaction
$connection): boolCommits an in-progress transaction on the specified connection resource and begins a new transaction. PHP applications normally default to AUTOCOMMIT mode, so db2_commit() is not necessary unless AUTOCOMMIT has been turned off for the connection resource.
connectionA valid database connection resource variable as returned from db2_connect() or db2_pconnect().
成功时返回 true， 或者在失败时返回 false。