postgresql触发器使用实例

概述创建测试表： CREATE TABLE emp ( empname text NOT NULL, salary integer ); CREATE TABLE emp_audit( operation text NOT NULL, stamp timestamp NOT NULL, userid text NOT NULL, empname text NOT NULL, salary intege 创建测试表：
CREATE table emp (
empname text NOT NulL,
salary integer
);

CREATE table emp_audit(
operation text NOT NulL,
stamp timestamp NOT NulL,
userID text NOT NulL,
empname text NOT NulL,
salary integer
);

创建存储过程：
CREATE OR REPLACE FUNCTION process_emp_audit()
RETURNS TRIGGER AS
$emp_audit$
BEGIN
IF (TG_OP = 'DELETE') THEN
INSERT INTO emp_audit SELECT 'DELETE',Now(),user,olD.*;
ELSIF (TG_OP = 'UPDATE') THEN
-- save old and new values
INSERT INTO emp_audit SELECT 'olD',olD.*;
INSERT INTO emp_audit SELECT 'NEW',NEW.*;
ELSIF (TG_OP = 'INSERT') THEN
INSERT INTO emp_audit SELECT 'INSERT',NEW.*;
ELSEIF (TG_OP = 'TruncATE') THEN
INSERT INTO emp_audit SELECT 'TruncATE','-',-1;
END IF;
RETURN NulL; -- result is ignored bacause this is an AFTER trigger
END;
$emp_audit$ LANGUAGE plpgsql;

创建针对insert和update每行的触发器：

CREATE TRIGGER emp_audit
AFTER INSERT OR UPDATE OR DELETE ON emp
FOR EACH ROW EXECUTE PROCEDURE process_emp_audit();

创建针对update的语句级的触发器：

CREATE TRIGGER emp_audit_truncate AFTER TruncATE ON emp FOR EACH STATEMENT EXECUTE PROCEDURE process_emp_audit(); 总结

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