--动态语句语法 /****************************************************************************************************************************************************** 动态语句语法:exec\sp_executesql语法整理人:中国风(Roy)日期:2008.06.06 ******************************************************************************************************************************************************/ 动态语句语法:--方法1查询表改为动态 select * from sysobjects exec('select ID,Name from sysobjects') exec sp_executesql N'select ID,Name from sysobjects'--多了一个N为unicode--方法2:字段名,表名,数据库名之类作为变量时,用动态SQL declare @FName varchar(20) set @FName='ID' exec('select '+@FName+' from sysobjects where '+@FName+'=5' ) declare @s varchar(1000) set @s=N'select '+@FName+' from sysobjects where '+@FName+'=5' exec sp_executesql @s--会报错 declare @s nvarchar(1000)--改为nvarchar set @s=N'select '+@FName+' from sysobjects where '+@FName+'=5' exec sp_executesql @s--成功 --方法3:输入参数declare @i int,@s nvarchar(1000) set @i=5 exec('select ID,Name from sysobjects where ID='+@i)set @s='select ID,Name from sysobjects where ID=@i' exec sp_executesql @s,N'@i int',@i--此处输入参数要加上N--方法4:输出参数declare @i int,@s nvarchar(1000) set @s='select @i=count(1) from sysobjects'--用exec exec('declare @i int '+@s+' select @i')--把整个语句用字符串加起来执行--用sp_executesql exec sp_executesql @s,N'@i int output',@i output--此处输出参数要加上N select @i --方法5:输入输出--用sp_executesql declare @i int,@con int,@s nvarchar(1000) set @i=5 select @s='select @con=count(1) from sysobjects where ID>@i' exec sp_executesql @s,N'@con int output,@i int',@con output ,@i select @con--用exec declare @i int,@s nvarchar(1000) set @i=5 select @s='declare @con int select @con=count(1) from sysobjects where ID>'+rtrim(@i)+' select @con' exec(@s)
declare @field varchar(100),@printSQL varchar(8000)
select @field='f1,f2,f3',@printsql='select '
select @printSQL=@printSQL + replace(@field,',',' union all select ')
print @printSQL
用@index来选择@field1或@field2或@field3是必须要做到的但是我就是不知道如果动态的来实现?
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/******************************************************************************************************************************************************
动态语句语法:exec\sp_executesql语法整理人:中国风(Roy)日期:2008.06.06
******************************************************************************************************************************************************/
动态语句语法:--方法1查询表改为动态
select * from sysobjects
exec('select ID,Name from sysobjects')
exec sp_executesql N'select ID,Name from sysobjects'--多了一个N为unicode--方法2:字段名,表名,数据库名之类作为变量时,用动态SQL
declare @FName varchar(20)
set @FName='ID'
exec('select '+@FName+' from sysobjects where '+@FName+'=5' )
declare @s varchar(1000)
set @s=N'select '+@FName+' from sysobjects where '+@FName+'=5'
exec sp_executesql @s--会报错
declare @s nvarchar(1000)--改为nvarchar
set @s=N'select '+@FName+' from sysobjects where '+@FName+'=5'
exec sp_executesql @s--成功
--方法3:输入参数declare @i int,@s nvarchar(1000)
set @i=5
exec('select ID,Name from sysobjects where ID='+@i)set @s='select ID,Name from sysobjects where ID=@i'
exec sp_executesql @s,N'@i int',@i--此处输入参数要加上N--方法4:输出参数declare @i int,@s nvarchar(1000)
set @s='select @i=count(1) from sysobjects'--用exec
exec('declare @i int '+@s+' select @i')--把整个语句用字符串加起来执行--用sp_executesql
exec sp_executesql @s,N'@i int output',@i output--此处输出参数要加上N
select @i
--方法5:输入输出--用sp_executesql
declare @i int,@con int,@s nvarchar(1000)
set @i=5
select @s='select @con=count(1) from sysobjects where ID>@i'
exec sp_executesql @s,N'@con int output,@i int',@con output ,@i
select @con--用exec
declare @i int,@s nvarchar(1000)
set @i=5
select @s='declare @con int select @con=count(1) from sysobjects where ID>'+rtrim(@i)+' select @con'
exec(@s)
以下前几日闲来没事时,写了2005环境下一个实现变量传参的方法改为2000方法相同
http://blog.csdn.net/roy_88/archive/2008/06/19/2564334.aspx
declare @index int
declare @len int
declare @printSQL varchar(8000) --declare @field1 varchar(50)
--declare @field2 varchar(50)
--declare @field3 varchar(50)
--
--set @field1='filed1'
--set @field2='filed2'
--set @field3='filed3' set @index=1
set @len=3 while @index <=@len
begin
set @printSQL =isnull(@printSQL+'union all select',' select ')+ ' ''field'+rtrim(@index)+''''
set @index = @index + 1
end
print(@printSQL)
exec(@printSQL)