SQL删除数据库里所有表的外键，同时删除所有用户表
删除所有的用户表的外键，直接将下面的代码拷贝到数据库里执行即可：
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--查询删除前的当前数据库所有约束select * from information_schema.key_column_usage
declare @TableName nvarchar(250)--声明读取数据库所有数据表名称游标mycursor1declare mycursor1 cursor for select name from dbo.SysObjects WHERE OBJECTPROPERTY(ID, 'IsUserTable') = 1
--打开游标
open mycursor1 --从游标里取出数据赋值到我们刚才声明的数据表名变量中fetch next from mycursor1 into @TableName
--如果游标执行成功 while (@@fetch_status=0)
begin --定义当前外键约束变量
declare @ConstraintName varchar (200) --删除当前数据表的所有外键约束 --声明读取数据表所有外键约束名称游标mycursor2declare mycursor2 cursor for select name from dbo.sysobjects where Xtype = 'F' and Parent_Obj = (select [ID] from dbo.sysobjects where id = object_id(N'['+@TableName+']') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
--打开游标open mycursor2 --从游标里取出数据赋值到外键约束名称变量中fetch next from mycursor2 into @ConstraintName
--如果游标执行成功 while (@@fetch_status=0)
begin --删除当前找到的外键exec ('ALTER TABLE '+@TableName+' DROP CONSTRAINT '+@ConstraintName)
--print 'ALTER TABLE '+@TableName+' DROP CONSTRAINT '+@ConstraintName
--用游标去取下一条记录fetch next from mycursor2 into @ConstraintName
end --关闭游标close mycursor2 --撤销游标deallocate mycursor2 --用游标去取下一条记录
fetch next from mycursor1 into @TableName
end --关闭游标close mycursor1 --撤销游标deallocate mycursor1 --查询删除后的当前数据库所有约束select * from information_schema.key_column_usage
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删除所有的数据表，也是直接执行下面的代码：
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declare @sql varchar(8000)SELECT @sql='drop table ' + name
FROM sysobjectsWHERE (type = 'U')
ORDER BY 'drop table ' + name
exec(@sql) |