set @sql = 'select m.orderid , m.orderno , m.ContSize , m.ContClass , m.contno ' select @sql = @sql + ' , max(case n.px when ''' + cast(px as varchar) + ''' then yfdx else '''' end) [yfdx' + cast(px as varchar) + ']' + ' , max(case n.px when ''' + cast(px as varchar) + ''' then yflx else '''' end) [yflx' + cast(px as varchar) + ']' + ' , max(case n.px when ''' + cast(px as varchar) + ''' then yfje else 0 end) [yfje' + cast(px as varchar) + ']' from (select distinct px from (select * , px = (select count(*) from planyf where orderid = t.orderid and yfid < t.yfid) + 1 from planyf t) o) as a set @sql = @sql + ' from planorder m ,(select * , px = (select count(*) from planyf where orderid = t.orderid and yfid < t.yfid) + 1 from planyf t) n where m.orderid = n.orderid and and substring(m.orderno,2,2)='''+@nf+''' and substring(M.orderno,4,2)='''+@yf+''' group by m.orderid , m.OrderNo , m.ContSize , m.ContClass , m.contno'
动态sql语句基本语法 1 :普通SQL语句可以用Exec执行 eg: Select * from tableName Exec('select * from tableName') Exec sp_executesql N'select * from tableName' -- 请注意字符串前一定要加N 2:字段名,表名,数据库名之类作为变量时,必须用动态SQL eg: declare @fname varchar(20) set @fname = 'FiledName' Select @fname from tableName -- 错误,不会提示错误,但结果为固定值FiledName,并非所要。 Exec('select ' + @fname + ' from tableName') -- 请注意 加号前后的 单引号的边上加空格 当然将字符串改成变量的形式也可 declare @fname varchar(20) set @fname = 'FiledName' --设置字段名 declare @s varchar(1000) set @s = 'select ' + @fname + ' from tableName' Exec(@s) -- 成功 exec sp_executesql @s -- 此句会报错 declare @s Nvarchar(1000) -- 注意此处改为nvarchar(1000) set @s = 'select ' + @fname + ' from tableName' Exec(@s) -- 成功 exec sp_executesql @s -- 此句正确 3. 输出参数 declare @num int, @sqls nvarchar(4000) set @sqls='select count(*) from tableName' exec(@sqls) --如何将exec执行结果放入变量中? declare @num int, @sqls nvarchar(4000) set @sqls='select @a=count(*) from tableName ' exec sp_executesql @sqls,N'@a int output',@num output select @num
select @sql = @sql + ' , max(case n.px when ''' + cast(px as varchar) + ''' then yfdx else '''' end) [yfdx' + cast(px as varchar) + ']'
+ ' , max(case n.px when ''' + cast(px as varchar) + ''' then yflx else '''' end) [yflx' + cast(px as varchar) + ']'
+ ' , max(case n.px when ''' + cast(px as varchar) + ''' then yfje else 0 end) [yfje' + cast(px as varchar) + ']'
from (select distinct px from (select * , px = (select count(*) from planyf where orderid = t.orderid and yfid < t.yfid) + 1 from planyf t) o) as a
set @sql = @sql + ' from planorder m ,(select * , px = (select count(*) from planyf where orderid = t.orderid and yfid < t.yfid) + 1 from planyf t) n where m.orderid = n.orderid and and substring(m.orderno,2,2)='''+@nf+''' and substring(M.orderno,4,2)='''+@yf+''' group by m.orderid , m.OrderNo , m.ContSize , m.ContClass , m.contno'
1 :普通SQL语句可以用Exec执行 eg: Select * from tableName
Exec('select * from tableName')
Exec sp_executesql N'select * from tableName' -- 请注意字符串前一定要加N 2:字段名,表名,数据库名之类作为变量时,必须用动态SQL eg:
declare @fname varchar(20)
set @fname = 'FiledName'
Select @fname from tableName -- 错误,不会提示错误,但结果为固定值FiledName,并非所要。
Exec('select ' + @fname + ' from tableName') -- 请注意 加号前后的 单引号的边上加空格 当然将字符串改成变量的形式也可
declare @fname varchar(20)
set @fname = 'FiledName' --设置字段名 declare @s varchar(1000)
set @s = 'select ' + @fname + ' from tableName'
Exec(@s) -- 成功
exec sp_executesql @s -- 此句会报错 declare @s Nvarchar(1000) -- 注意此处改为nvarchar(1000)
set @s = 'select ' + @fname + ' from tableName'
Exec(@s) -- 成功
exec sp_executesql @s -- 此句正确 3. 输出参数
declare @num int,
@sqls nvarchar(4000)
set @sqls='select count(*) from tableName'
exec(@sqls)
--如何将exec执行结果放入变量中? declare @num int,
@sqls nvarchar(4000)
set @sqls='select @a=count(*) from tableName '
exec sp_executesql @sqls,N'@a int output',@num output
select @num