SQL批量删除含有外键的表的方法

SQL批量删除表时，如果表有外键，就不能直接删除，下面将为您介绍SQL批量删除含有外键的表的方法，供您参考，希望能够帮助到您。

写法一：

set xact_abort on

begin tran

DECLARE @SQL VARCHAR(99)

DECLARE CUR_FK CURSOR LOCAL FOR

SELECT 'alter table '+ OBJECT_NAME(FKEYID) + ' drop constraint ' + OBJECT_NAME(CONSTID) FROM SYSREFERENCES

--删除所有外键

OPEN CUR_FK

FETCH CUR_FK INTO @SQL

WHILE @@FETCH_STATUS =0

BEGIN

EXEC(@SQL)

FETCH CUR_FK INTO @SQL

END

CLOSE CUR_FK

DEALLOCATE CUR_FK

-- 删除所有表

DECLARE CUR_TAB CURSOR LOCAL FOR

SELECT 'DROP TABLE '+ NAME FROM SYSOBJECTS WHERE XTYPE='U' -- AND NAME LIKE 'xx%'

OPEN CUR_TAB

FETCH CUR_TAB INTO @SQL

WHILE @@FETCH_STATUS =0

BEGIN

EXEC(@SQL)

FETCH CUR_TAB INTO @SQL

END

CLOSE CUR_TAB

DEALLOCATE CUR_TAB

commit tran

写法二

DECLARE @SQL VARCHAR(99),@TBL VARCHAR(30),@FK VARCHAR(30)

DECLARE CUR_FK CURSOR LOCAL FOR

SELECT OBJECT_NAME(CONSTID),OBJECT_NAME(FKEYID) FROM SYSREFERENCES

--删除所有外键

OPEN CUR_FK

FETCH CUR_FK INTO @FK,@TBL

WHILE @@FETCH_STATUS =0

BEGIN

SELECT @SQL='ALTER TABLE '+@TBL+' DROP CONSTRAINT '+@FK

EXEC(@SQL)

FETCH CUR_FK INTO @FK,@TBL

END

CLOSE CUR_FK

DECLARE CUR_FKS CURSOR LOCAL FOR

SELECT NAME FROM SYSOBJECTS WHERE XTYPE='U'

OPEN CUR_FKS

FETCH CUR_FKS INTO @TBL

WHILE @@FETCH_STATUS =0

BEGIN

SELECT @SQL='DROP TABLE ['+@TBL+']'

EXEC(@SQL)

FETCH CUR_FKS INTO @TBL

END

CLOSE CUR_FKS