SET XACT_ ABORT ON

SET XACT_ABORT ON when , In business , If an error occurs , The system rolls back the transaction by default , But only for non custom errors

SET XACT_ABORT OFF, The default value is , In business , Whether to rollback a statement or the whole transaction depends on the serious program of the error , User level errors generally do not rollback the entire transaction When SET XACT_ABORT is ON, if a Transact-SQL statement raises a run-time error, the entire transaction is terminated and rolled back. The setting of SET XACT_ABORT is set at execute or run time and not at parse（ Analyze... Grammatically ; analysis ） time.

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