SQL批量删除与批量插入

批量删除：

DELETE FROM MyTable WHERE ID IN (1,2);

批量插入：

INSERT INTO MyTable(ID,NAME) VALUES(1,'123');
INSERT INTO MyTable(ID,NAME) VALUES(2,'456');
INSERT INTO MyTable(ID,NAME) VALUES(3,'789');

第二种方法，使用UNION ALL来进行插入操作：
INSERT INTO MyTable(ID,NAME)
SELECT 4,'000'
UNION ALL
SELECT 5,'001'
UNION ALL
SELECT 6,'002' ;
据说要比第一种要快！

第三种方法
INSERT INTO MyTable(ID,NAME) VALUES(7,'003'),(8,'004'),(9,'005');

Example：

表： leafjob(
leafnum INT NOT NULL PRIMARY KEY,
machine VARCHAR(15) );

删除：delete from leafjob where leafnum in (1,2,4);

插入：

INSERT INTO leafjob (leafnum, machine) values(1, 'r1leaf3'), (2, 'r1leaf22');

insert into leafjob(leafnum, machine) select 4,'000' union all select 1,'r1leaf3' union all select 2,'r1leaf22';

insert into leafjob(leafnum, machine) select 1,'r1leaf3' union select 2,'r1leaf22';

注：性能问题需要具体测试。示例在MySql下测试过，version: 4.1.20

删除A表的a列等于1的数据

代码如下	复制代码
Delete from A where exists （Select 1 from A where a=1）

上面的方法只适用于简单小数据量的批量数据删除了，如果是大批量数据删除我们可参考下面方法

代码如下

复制代码

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