sql批量删除数据与批量删除数据库表语句

//定义游标

DECLARE tables_cursor CURSOR

FOR

SELECT name FROM sysobjects WHERE type = 'U' //选择用户表名

OPEN tables_cursor //打开游标连接

DECLARE @tablename sysname // 定义变量

FETCH NEXT FROM tables_cursor INTO @tablename //结果集中一行一行读取表名

WHILE (@@FETCH_STATUS <> -1) //判断游标状态

BEGIN

EXEC ('TRUNECATE TABLE ' + @tablename) //清空表中的数据

FETCH NEXT FROM tables_cursor INTO @tablename //下一行数据

END

DEALLOCATE tables_cursor //关闭游标

Create PROCEDURE Batch_Delete
@TableName nvarchar(100), --表名
@FieldName nvarchar(100), --删除字段名
@DelCharIndexID nvarchar(1000)
as
DECLARE @PointerPrev int
DECLARE @PointerCurr int
DECLARE @TId NVARCHAR(50), @sql NVARCHAR(1000)

Set @PointerPrev = 1
while (@PointerPrev < LEN(@DelCharIndexID))
Begin
Set @PointerCurr = CharIndex(',',@DelCharIndexID,@PointerPrev)
if(@PointerCurr>0)
Begin
SET @TId = cast(SUBSTRING(@DelCharIndexID, @PointerPrev, @PointerCurr - @PointerPrev) As NVARCHAR(50))
SET @sql = 'Delete From '+ @TableName +' Where '+ @FieldName + ' = '''+ @TID+''''
Exec(@Sql)
Print('======='+@TId+'=======sql'+@Sql)
SET @PointerPrev = @PointerCurr + 1
Print(@PointerPrev)
End
else
Begin
Print('break')
Break
End
End
--删除最后一个,因为最后一个后面没有逗号,所以在循环中跳出,需另外再删除
SET @TId = cast(SUBSTRING(@DelCharIndexID, @PointerPrev, LEN(@DelCharIndexID) - @PointerPrev + 1) As NVARCHAR(50))
SET @sql = 'Delete From '+ @TableName +' Where '+ @FieldName + ' = '''+ @TID+''''
Exec(@Sql)
Print('======='+@TId+'=======sql'+@Sql)
GO

  /*--------------------------------

功能说明:  批量DropTable

使用说明:  使用时一定要小心，因为删选表的where条件是like所有必须保证where

后的like确定与你要删除表名相匹配

---------------------------------*/

--------参数定义-------------------

DECLARE @tableName AS Nvarchar(50) --查询表名条件（小心！，确保like条件是你要Drop的表.TableName尽量精确）

SET @tableName='test' 

--------------------------------------

--SELECT name FROM sys.tables   WHERE name LIKE '%'+@tableName+'%' --查询出要删除表的名称

IF @tableName='' SET @tableName='tableName'--初始化TableName为tableName,防止@tableName为空

DECLARE @tableNames AS Nvarchar(3000)

DECLARE @sql AS Nvarchar(3000)

SET @tableNames=

(SELECT ','+name FROM sys.tables   WHERE name LIKE '%'+@tableName+'%'  FOR XML PATH(''))

SET @tableNames= Stuff(@tableNames,1,1,'')

SET @sql='DROP TABLE '+@tableNames

EXEC(@sql)