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sqlserver instead of触发器

时间: 2023-03-16 08:47:11 浏览: 129

instead of 触发器

CREATE TRIGGER IO_Trig_INS_Employee ON Employee INSTEAD OF INSERT AS BEGIN SET NOCOUNT ON IF (NOT EXISTS (SELECT P.SSN FROM Person P, inserted I WHERE P.SSN = I.SSN)) INSERT INTO Person SELECT SSN,Name,Address,Birthdate,Comment FROM inserted ELSE INSERT INTO PersonDuplicates SELECT SSN,Name,Address,Birthdate,SUSER_SNAME(),GETDATE() FROM inserted IF (NOT EXISTS (SELECT E.SSN FROM EmployeeTable E, inserted WHERE E.SSN = inserted.SSN)) INSERT INTO EmployeeTable SELECT EmployeeID,SSN, Department, Salary,Comment FROM inserted ELSE UPDATE EmployeeTable SET EmployeeID = I.EmployeeID, Department = I.Department, Salary = I.Salary, Comment = I.Comment FROM EmployeeTable E, inserted I WHERE E.SSN = I.SSN END

SQL Server 触发器是一种特殊的存储过程，它会在数据库中的特定事件发生时自动执行。触发器可以用于执行数据验证、数据转换、数据复制等操作。但是，触发器的使用也会带来一些问题，例如性能问题、复杂性问题等。因此，在某些情况下，可以考虑使用其他方法来代替触发器，例如使用存储过程、使用约束等。

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