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Code Inspection: Use of transaction management statements in triggers

Reports usages of transaction management statements like COMMIT or ROLLBACK in trigger bodies.

With COMMIT or ROLLBACK statements in a trigger body, the trigger will not compile. The fail happens because triggers start during transactions. When the trigger starts the current transaction is still not complete. As COMMIT terminates a transaction, both statements (COMMIT and ROLLBACK) would lead to an exception. Changes that are executed in a trigger should be committed (or rolled back) by the owning transaction that started the trigger.

Example (Oracle):

CREATE TABLE employee_audit ( id INT NOT NULL, update_date DATE NOT NULL, old_name VARCHAR2(100), new_name VARCHAR2(100) ); CREATE TABLE employees ( id INT NOT NULL, name VARCHAR2(100) NOT NULL ); CREATE OR REPLACE TRIGGER trig_commit AFTER UPDATE OF name ON employees FOR EACH ROW BEGIN INSERT INTO employee_audit VALUES (:old.id, SYSDATE, :old.name, :new.name); COMMIT; END; CREATE OR REPLACE TRIGGER trig_rollback AFTER UPDATE OF name ON employees FOR EACH ROW BEGIN INSERT INTO employee_audit VALUES (:old.id, SYSDATE, :old.name, :new.name); ROLLBACK; END;

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Last modified: 13 May 2022