sqlserver 各种判断是否存在(表、视图、函数、存储过程等) |
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-- SQL SERVER 判断是否存在某个触发器、储存过程 -- 判断储存过程,如果存在则删除IF (EXISTS(SELECT * FROM sysobjects WHERE name='procedurename' AND type='P'))DROP PROCEDURE procedurename -- 判断触发器,如果存在则删除IF (EXISTS(SELECT * FROM sysobjects WHERE id=object_id(N'[dbo].[triggername]') AND OBJECTPROPERTY(id, N'IsTrigger') = 1))DROP TRIGGER triggername -- 判断用户函数是否存在,如果存在则删除-- 此处type有两种: 'TF'- Table-Value Function 表值函数 'FN'- Scalar-Value Function 标量值函数IF (EXISTS(SELECT * FROM sysobjects WHERE id=object_id(N'[dbo].[userfunction]') AND (type='FN' OR type='TF')))DROP FUNCTION userfunction -- 判断视图是否存在,存在则删除IF (EXISTS(SELECT TABLE_NAME FROM INFORMATION_SCHEMA.VIEWS WHERE TABLE_NAME=N'viewname'))DROP VIEW viewname -- 判断用户表 是否存在,若存在则删除IF (EXISTS(SELECT * FROM sysobjects WHERE id=N'tablename' AND OBJECTPROPERTY(id, N'IsUserTable')=1))DROP TABLE tablename -- 判断数据库,如果存在则删除IF (EXISTS(SELECT * FROM master.dbo.sysdatabases WHERE dbid=db_ID('dbname')))DROP DATABASE dbname -- 如果提示:删除数据库时提示数据库正在被使用,无法删除(Cannot drop database databasename because it is currently in use),使用: IF (EXISTS(SELECT * FROM master.dbo.sysdatabases WHERE dbid=db_ID('dbname'))) BEGIN USE master ALTER DATABASE dbname SET single_user WITH ROLLBACK IMMEDIATE DROP DATABASE dbname END |
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