1.对数据库中的表批量清空删除 （慎用）
use PL123
EXEC sp_MSForEachTable 'ALTER TABLE ? NOCHECK CONSTRAINT ALL'
EXEC sp_MSForEachTable 'ALTER TABLE ? DISABLE TRIGGER ALL'
EXEC sp_MSForEachTable 'DELETE from ?'
EXEC sp_MSForEachTable 'ALTER TABLE ? CHECK CONSTRAINT ALL'
EXEC sp_MSForEachTable 'ALTER TABLE ? ENABLE TRIGGER ALL'
EXEC sp_MSFOREACHTABLE 'SELECT * from ?'
EXEC sp_MSFOREACHTABLE 'drop table ?'
GO
2.清空表
Truncate table tablename
delete from tablename
3.游标实现清空指定表 ！！！游标经典应用
use TOMR_SYS_C_LP --选择你要清空的数据库
---禁用本库中所有表的外键约束
DECLARE Employee_Cursor CURSOR FOR
select name from sysobjects where xtype='u' and (not name LIKE 'dtproperties') order by [name] asc;
declare @tablename varchar(300);
declare @str varchar(1000);
declare @rst int;
OPEN Employee_Cursor;
FETCH NEXT FROM Employee_Cursor into @tablename;
WHILE @@FETCH_STATUS = 0
BEGIN
select @str = 'ALTER TABLE '+ @tablename + ' NOCHECK CONSTRAINT ALL';
EXECUTE(@str);
FETCH NEXT FROM Employee_Cursor into @tablename;
END
CLOSE Employee_Cursor;
DEALLOCATE Employee_Cursor;
GO
--删除表中数据
DECLARE delete_Cursor CURSOR FOR
select name from sysobjects where xtype='u' and (not name LIKE 'dtproperties') order by [name] asc;
declare @tablename varchar(300);
declare @str varchar(1000);
declare @rst int;
OPEN delete_Cursor;
FETCH NEXT FROM delete_Cursor into @tablename;
WHILE @@FETCH_STATUS = 0
BEGIN
--这里写你不需要删除数据的表名
IF(@tablename = 'xx')
begin
print('未删除表数据 '+@tablename)
end
ElSE
begin
select @str = 'delete from '+ @tablename;
EXECUTE(@str);
print('删除表数据 '+@tablename)
end
FETCH NEXT FROM delete_Cursor into @tablename;
END
CLOSE delete_Cursor;
DEALLOCATE delete_Cursor;
GO
--恢复所有表外键约束
DECLARE Employee_Cursor CURSOR FOR
select name from sysobjects where xtype='u' and (not name LIKE 'dtproperties') order by [name] asc;
declare @tablename varchar(300);
declare @str varchar(1000);
declare @rst int;
OPEN Employee_Cursor;
FETCH NEXT FROM Employee_Cursor into @tablename;
WHILE @@FETCH_STATUS = 0
BEGIN
select @str = 'ALTER TABLE '+ @tablename + ' CHECK CONSTRAINT ALL';
EXECUTE(@str);
FETCH NEXT FROM Employee_Cursor into @tablename;
END
CLOSE Employee_Cursor;
DEALLOCATE Employee_Cursor;
GO
实例：
use tyzh
--删除表数据readerdata
DECLARE delete_Cursor CURSOR FOR
select name from sysobjects where xtype='u' and (not name LIKE 'dtproperties')
and name like 'locatedata2011%'
or name like 'ReaderData2011%'
or name like 'stayInterval2011%'
order by [name] asc;
declare @tablename varchar(300);
declare @str varchar(1000);
declare @rst int;
OPEN delete_Cursor;
FETCH NEXT FROM delete_Cursor into @tablename;
WHILE @@FETCH_STATUS = 0
BEGIN
--这里写你不需要删除数据的表名
IF(
@tablename = 'locatedata20111221'
or
@tablename = 'ReaderData20111221'
or
@tablename = 'stayInterval20111221'
)
begin
print('-------------------------')
print('未删除表数据'+@tablename)
end
ElSE
begin
select @str = 'delete from '+ @tablename;
EXECUTE(@str);
print('删除表数据'+@tablename)
end
FETCH NEXT FROM delete_Cursor into @tablename;
END
CLOSE delete_Cursor;
DEALLOCATE delete_Cursor;
GO
系统存储批量清空SqlServer中所有表的数据
2010-12-19 14:03
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清空SqlServer中所有表的数据 view sourceprint?1 sp_MSforeachtable @command1='Delete from ?'
view sourceprint?01 sp_MSforeachtable使用方法 02 03 1)说明 04 系统存储过程sp_MSforeachtable和sp_MSforeachdb,是微软提供的两个不公开的存储过程,从ms sql 6.5开始。 05 存放在SQL Server的MASTER数据库中。 06 07 2)参数说明: 08 @command1 nvarchar(2000), --第一条运行的SQL指令 09 @replacechar nchar(1) = N'?', --指定的占位符号 10 @command2 nvarchar(2000)= null, --第二条运行的SQL指令 11 @command3 nvarchar(2000)= null, --第三条运行的SQL指令 12 @whereand nvarchar(2000)= null, --可选条件来选择表 13 @precommand nvarchar(2000)= null, --执行指令前的操作(类似控件的触发前的操作) 14 @postcommand nvarchar(2000)= null --执行指令后的操作(类似控件的触发后的操作) 15 16 3)举例 17 --统计数据库里每个表的详细情况 18 exec sp_MSforeachtable @command1="sp_spaceused '?'" 19 --获得每个表的记录数和容量: 20 EXEC sp_MSforeachtable @command1="print '?'", 21 @command2="sp_spaceused '?'", 22 @command3= "SELECT count(*) FROM ? " 23 --获得所有的数据库的存储空间: 24 EXEC sp_MSforeachdb @command1="print '?'", 25 @command2="sp_spaceused " 26 --检查所有的数据库 27 EXEC sp_MSforeachdb @command1="print '?'", 28 @command2="DBCC CHECKDB (?) " 29 --更新PUBS数据库中已t开头的所有表的统计: 30 EXEC sp_MSforeachtable @whereand="and name like 't%'", 31 @replacechar='*', 32 @precommand="print 'Updating Statistics.....' print ''", 33 @command1="print '*' update statistics * ", 34 @postcommand= "print''print 'Complete Update Statistics!'" 35 --删除当前数据库所有表中的数据 36 sp_MSforeachtable @command1='Delete from ?' 37 sp_MSforeachtable @command1 = "TRUNCATE TABLE ?" 38 39 4)参数@whereand的用法 40 @whereand参数在存储过程中起到指令条件限制的作用,具体的写法如下: 41 @whereend,可以这么写 @whereand=' AND o.name in (''Table1'',''Table2'',.......)' 42 例如:我想更新Table1/Table2/Table3中NOTE列为NULL的值 43 sp_MSforeachtable @command1='Update ? Set NOTE='''' Where NOTE is NULL',@whereand=' AND o.name in (''Table1'',''Table2'',''Table3'')' 44 45 5)"?"在存储过程的特殊用法,造就了这两个功能强大的存储过程 46 这里"?"的作用,相当于DOS命令中、以及我们在WINDOWS下搜索文件时的通配符的作用。
print '打印所有需要清空的表:' print '打印没有外键约束的表:' print '打印有外键约束的表:'
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