declare name varchar(40)declare t_cursor cursor for select name from sysobjects where type='U'open t_cursorfetch next from t_cursor into @namewhile @@fetch_status=0 begin exec('select * from '+@name) fetch next from t_cursor into @name endclose t_cursor deallocate t_cursorgo
--用微软未公开的存储过程 exec sp_msforeachtable 'select ''?'' as ''表名'',(select count(1) from ?) as ''行数'''
浅析SQL SERVER一个没有公开的存储过程 从SQLSERVER6.5开始,MS提供了一个非常有用的系统存储过程sp_MSforeachtable和sp_MSforeachDB;作为DBA会经常需要检查所有的数据库或用户 表,比如:检查所有数据库的容量;看看指定数据库所有用户表的容量,所有表的记录数,我们一般处理这样的问题都是用游标分别处理处理,比如: 在数据库检索效率非常慢时,我们想检查数据库所有的用户表,我们就必须这样写游标:DECLARE @TableName varchar(255) DECLARE @ExeSQL varchar(4000) DECLARE Table_Cursor CURSOR FOR SELECT [name] FROM sysobjects WHERE xtype='U' OPEN Table_Cursor FETCH NEXT FROM Table_Cursor INTO @TableName WHILE(@@FETCH_STATUS=0) BEGIN PRINT @TableName SELECT @ExeSQL='DBCC CHECKTABLE('''+@TableName+''')' EXEC(@EXESQL) FETCH NEXT FROM Table_Cursor INTO @TableName END CLOSE Table_Cursor DEALLOCATE Table_Cursor GO 如果我们用sp_MSforeachtable就可以非常方便的达到相同的目的: EXEC sp_MSforeachtable @command1=“print '?' DBCC CHECKTABLE('?')” 大家可以看出这样就更加简洁(虽然在后台也是通过游标来处理的),下面我们就仔细分析一下sp_MSforeachtable这个存储过程: 我们看看sp_MSforeachtable详细的CODE: USE MASTER GO SP_HELPTEXT sp_MSforeachtable --下面时sp_MSforeachtable的原始代码 CREATE proc sp_MSforeachtable @command1 nvarchar(2000), @replacechar nchar(1) = N'?', @command2 nvarchar(2000) = null, @command3 nvarchar(2000) = null, @whereand nvarchar(2000) = null, @precommand nvarchar(2000) = null, @postcommand nvarchar(2000) = null as /* This proc returns one or more rows for each table (optionally, matching @where), with each table defaulting to its own result set */ /* @precommand and @postcommand may be used to force a single result set via a temp table。 */ /* Preprocessor won't replace within quotes so have to use str()。 */ declare @mscat nvarchar(12) select @mscat = ltrim(str(convert(int, 0x0002))) if (@precommand is not null) exec(@precommand) /* Create the select */ exec(N'declare hCForEach cursor global for select ''['' + REPLACE(user_name(uid), N'']'', N'']]'') + '']'' + ''。'' + ''['' + REPLACE(object_name(id), N'']'', N'']]'') + '']'' from dbo。sysobjects o ' + N' where OBJECTPROPERTY(o。id, N''IsUserTable'') = 1 ' + N' and o。category & ' + @mscat + N' = 0 ' + @whereand) declare @retval int select @retval = @@error if (@retval = 0) exec @retval = sp_MSforeach_worker @command1, @replacechar, @command2, @command3 if (@retval = 0 and @postcommand is not null) exec(@postcommand) return @retval这个系统存储过程有7个参数: @command1 nvarchar(2000), --第一条运行的T-SQL指令 @replacechar nchar(1) = N'?', --指定的占位符号 @command2 nvarchar(2000) = null,--第二条运行的T-SQL指令 @command3 nvarchar(2000) = null, --第三条运行的T-SQL指令 @whereand nvarchar(2000) = null, --可选条件来选择表 @precommand nvarchar(2000) = null, --在表前执行的指令 @postcommand nvarchar(2000) = null --在表后执行的指令所以上面的语句也可以这样写:EXEC sp_MSforeachtable @command1=“print '?'”, @command2= “DBCC CHECKTABLE('?')” 了解参数以后,就让我们做几个实列吧:1。获得每个表的记录数和容量:EXEC sp_MSforeachtable @command1=“print '?'“, @command2=“sp_spaceused '?'“, @command3= “SELECT count(*) FROM ? ”2。更新PUBS数据库中已t开头的所有表的统计:EXEC sp_MSforeachtable @whereand=“and name like 't%'”, @replacechar='*', @precommand=“print 'Updating Statistics。。' print ''”, @command1=“print '*' update statistics * “, @postcommand= “print''print 'Complete Update Statistics!'”sp_MSforeachDB除了@whereand外,和sp_MSforeachtable的参数是一样的,我们可以通过这个存储过程检测所有的数据库,比如:1。获得所有的数据库的存储空间: EXEC sp_MSforeachdb @command1=“print '?'“, @command2=“sp_spaceused “ 2。检查所有的数据库 EXEC sp_MSforeachdb @command1=“print '?'“, @command2=“DBCC CHECKDB (?) “ 有了上面的分析,我们可以建立自己的sp_MSforeachObject:USE MASTER GO CREATE proc sp_MSforeachObject @objectType int=1, @command1 nvarchar(2000), @replacechar nchar(1) = N'?', @command2 nvarchar(2000) = null, @command3 nvarchar(2000) = null, @whereand nvarchar(2000) = null, @precommand nvarchar(2000) = null, @postcommand nvarchar(2000) = null as /* This proc returns one or more rows for each table (optionally, matching @where), with each table defaulting to its own result set */ /* @precommand and @postcommand may be used to force a single result set via a temp table。 */ /* Preprocessor won't replace within quotes so have to use str()。 */ declare @mscat nvarchar(12) select @mscat = ltrim(str(convert(int, 0x0002))) if (@precommand is not null) exec(@precommand) /* Defined @isobject for save object type */ Declare @isobject varchar(256) select @isobject= case @objectType when 1 then 'IsUserTable' when 2 then 'IsView' when 3 then 'IsTrigger' when 4 then 'IsProcedure' when 5 then 'IsDefault' when 6 then 'IsForeignKey' when 7 then 'IsScalarFunction' when 8 then 'IsInlineFunction' when 9 then 'IsPrimaryKey' when 10 then 'IsExtendedProc' when 11 then 'IsReplProc' when 12 then 'IsRule' end /* Create the select */ /* Use @isobject variable isstead of IsUserTable string */ EXEC(N'declare hCForEach cursor global for select ''['' + REPLACE(user_name(uid), N'']'', N'']]'') + '']'' + ''。'' + ''['' + REPLACE(object_name(id), N'']'', N'']]'') + '']'' from dbo。sysobjects o ' + N' where OBJECTPROPERTY(o。id, N'''+@isobject+''') = 1 '+N' and o。category & ' + @mscat + N' = 0 ' + @whereand) declare @retval int select @retval = @@error if (@retval = 0) exec @retval = sp_MSforeach_worker @command1, @replacechar, @command2, @command3 if (@retval = 0 and @postcommand is not null) exec(@postcommand) return @retval GO 这样我们来测试一下:1。获得所有的存储过程的脚本: EXEc sp_MSforeachObject @command1=“sp_helptext '?' “,@objectType=42。获得所有的视图的脚本: EXEc sp_MSforeachObject @command1=“sp_helptext '?' “,@objectType=23。比如在开发过程中,没一个用户都是自己的OBJECT OWNER,所以在真实的数据库时都要改为DBO: EXEc sp_MSforeachObject @command1=“sp_changeobjectowner '?', 'dbo'“,@objectType=1 EXEc sp_MSforeachObject @command1=“sp_changeobjectowner '?', 'dbo'“,@objectType=2 EXEc sp_MSforeachObject @command1=“sp_changeobjectowner '?', 'dbo'“,@objectType=3 EXEc sp_MSforeachObject @command1=“sp_changeobjectowner '?', 'dbo'“,@objectType=4 这样就非常方便的将每一个数据库对象改为DBO。 当然还要很多非常好的功能,大家可以自己深入研究吧。
select name from sysobjects where type='U'open t_cursorfetch next from t_cursor into @namewhile @@fetch_status=0
begin
exec('select * from '+@name)
fetch next from t_cursor into @name
endclose t_cursor
deallocate t_cursorgo
exec sp_msforeachtable 'select ''?'' as ''表名'',(select count(1) from ?) as ''行数'''
浅析SQL SERVER一个没有公开的存储过程 从SQLSERVER6.5开始,MS提供了一个非常有用的系统存储过程sp_MSforeachtable和sp_MSforeachDB;作为DBA会经常需要检查所有的数据库或用户
表,比如:检查所有数据库的容量;看看指定数据库所有用户表的容量,所有表的记录数,我们一般处理这样的问题都是用游标分别处理处理,比如:
在数据库检索效率非常慢时,我们想检查数据库所有的用户表,我们就必须这样写游标:DECLARE @TableName varchar(255)
DECLARE @ExeSQL varchar(4000)
DECLARE Table_Cursor CURSOR FOR SELECT [name] FROM sysobjects WHERE xtype='U'
OPEN Table_Cursor
FETCH NEXT FROM Table_Cursor INTO @TableName
WHILE(@@FETCH_STATUS=0)
BEGIN
PRINT @TableName
SELECT @ExeSQL='DBCC CHECKTABLE('''+@TableName+''')'
EXEC(@EXESQL)
FETCH NEXT FROM Table_Cursor INTO @TableName
END
CLOSE Table_Cursor
DEALLOCATE Table_Cursor
GO
如果我们用sp_MSforeachtable就可以非常方便的达到相同的目的:
EXEC sp_MSforeachtable @command1=“print '?' DBCC CHECKTABLE('?')” 大家可以看出这样就更加简洁(虽然在后台也是通过游标来处理的),下面我们就仔细分析一下sp_MSforeachtable这个存储过程: 我们看看sp_MSforeachtable详细的CODE:
USE MASTER
GO
SP_HELPTEXT sp_MSforeachtable
--下面时sp_MSforeachtable的原始代码
CREATE proc sp_MSforeachtable
@command1 nvarchar(2000), @replacechar nchar(1) = N'?', @command2 nvarchar(2000) = null,
@command3 nvarchar(2000) = null, @whereand nvarchar(2000) = null,
@precommand nvarchar(2000) = null, @postcommand nvarchar(2000) = null
as
/* This proc returns one or more rows for each table (optionally, matching @where), with each table defaulting to its
own result set */
/* @precommand and @postcommand may be used to force a single result set via a temp table。 */
/* Preprocessor won't replace within quotes so have to use str()。 */
declare @mscat nvarchar(12)
select @mscat = ltrim(str(convert(int, 0x0002)))
if (@precommand is not null)
exec(@precommand)
/* Create the select */
exec(N'declare hCForEach cursor global for select ''['' + REPLACE(user_name(uid), N'']'', N'']]'') + '']'' + ''。'' +
''[''
+ REPLACE(object_name(id), N'']'', N'']]'') + '']'' from dbo。sysobjects o '
+ N' where OBJECTPROPERTY(o。id, N''IsUserTable'') = 1 ' + N' and o。category & ' + @mscat + N' = 0 '
+ @whereand)
declare @retval int
select @retval = @@error
if (@retval = 0)
exec @retval = sp_MSforeach_worker @command1, @replacechar, @command2, @command3
if (@retval = 0 and @postcommand is not null)
exec(@postcommand)
return @retval这个系统存储过程有7个参数: @command1 nvarchar(2000), --第一条运行的T-SQL指令
@replacechar nchar(1) = N'?', --指定的占位符号
@command2 nvarchar(2000) = null,--第二条运行的T-SQL指令
@command3 nvarchar(2000) = null, --第三条运行的T-SQL指令
@whereand nvarchar(2000) = null, --可选条件来选择表
@precommand nvarchar(2000) = null, --在表前执行的指令
@postcommand nvarchar(2000) = null --在表后执行的指令所以上面的语句也可以这样写:EXEC sp_MSforeachtable @command1=“print '?'”,
@command2= “DBCC CHECKTABLE('?')” 了解参数以后,就让我们做几个实列吧:1。获得每个表的记录数和容量:EXEC sp_MSforeachtable @command1=“print '?'“,
@command2=“sp_spaceused '?'“,
@command3= “SELECT count(*) FROM ? ”2。更新PUBS数据库中已t开头的所有表的统计:EXEC sp_MSforeachtable @whereand=“and name like 't%'”,
@replacechar='*',
@precommand=“print 'Updating Statistics。。' print ''”,
@command1=“print '*' update statistics * “,
@postcommand= “print''print 'Complete Update Statistics!'”sp_MSforeachDB除了@whereand外,和sp_MSforeachtable的参数是一样的,我们可以通过这个存储过程检测所有的数据库,比如:1。获得所有的数据库的存储空间:
EXEC sp_MSforeachdb @command1=“print '?'“,
@command2=“sp_spaceused “
2。检查所有的数据库
EXEC sp_MSforeachdb @command1=“print '?'“,
@command2=“DBCC CHECKDB (?) “
有了上面的分析,我们可以建立自己的sp_MSforeachObject:USE MASTER
GO
CREATE proc sp_MSforeachObject
@objectType int=1,
@command1 nvarchar(2000),
@replacechar nchar(1) = N'?',
@command2 nvarchar(2000) = null,
@command3 nvarchar(2000) = null,
@whereand nvarchar(2000) = null,
@precommand nvarchar(2000) = null,
@postcommand nvarchar(2000) = null
as
/* This proc returns one or more rows for each table (optionally, matching @where), with each table defaulting to its
own result set */
/* @precommand and @postcommand may be used to force a single result set via a temp table。 */
/* Preprocessor won't replace within quotes so have to use str()。 */
declare @mscat nvarchar(12)
select @mscat = ltrim(str(convert(int, 0x0002)))
if (@precommand is not null)
exec(@precommand)
/* Defined @isobject for save object type */
Declare @isobject varchar(256)
select @isobject= case @objectType when 1 then 'IsUserTable'
when 2 then 'IsView'
when 3 then 'IsTrigger'
when 4 then 'IsProcedure'
when 5 then 'IsDefault'
when 6 then 'IsForeignKey'
when 7 then 'IsScalarFunction'
when 8 then 'IsInlineFunction'
when 9 then 'IsPrimaryKey'
when 10 then 'IsExtendedProc'
when 11 then 'IsReplProc'
when 12 then 'IsRule'
end
/* Create the select */
/* Use @isobject variable isstead of IsUserTable string */
EXEC(N'declare hCForEach cursor global for select ''['' + REPLACE(user_name(uid), N'']'', N'']]'') + '']'' + ''。'' + ''['' +
REPLACE(object_name(id), N'']'', N'']]'') + '']'' from dbo。sysobjects o '
+ N' where OBJECTPROPERTY(o。id, N'''+@isobject+''') = 1 '+N' and o。category & ' + @mscat + N' = 0 '
+ @whereand)
declare @retval int
select @retval = @@error
if (@retval = 0)
exec @retval = sp_MSforeach_worker @command1, @replacechar, @command2, @command3
if (@retval = 0 and @postcommand is not null)
exec(@postcommand)
return @retval
GO 这样我们来测试一下:1。获得所有的存储过程的脚本:
EXEc sp_MSforeachObject @command1=“sp_helptext '?' “,@objectType=42。获得所有的视图的脚本:
EXEc sp_MSforeachObject @command1=“sp_helptext '?' “,@objectType=23。比如在开发过程中,没一个用户都是自己的OBJECT OWNER,所以在真实的数据库时都要改为DBO:
EXEc sp_MSforeachObject @command1=“sp_changeobjectowner '?', 'dbo'“,@objectType=1
EXEc sp_MSforeachObject @command1=“sp_changeobjectowner '?', 'dbo'“,@objectType=2
EXEc sp_MSforeachObject @command1=“sp_changeobjectowner '?', 'dbo'“,@objectType=3
EXEc sp_MSforeachObject @command1=“sp_changeobjectowner '?', 'dbo'“,@objectType=4 这样就非常方便的将每一个数据库对象改为DBO。 当然还要很多非常好的功能,大家可以自己深入研究吧。