借助SQL游标,可以轻松解决SQL查询全表的问题 。下面就为您介绍该SQL游标的写法,供您参考,希望对您学习SQL游标有所帮助 。
- Create procedure Full_Search(@string varchar(100))
- as
- begin
- declare @tbname varchar(100)
- declare tbroy cursor for select name from sysobjects
- where xtype=u --第一个游标遍历所有的表
-
- open tbroy
- fetch next from tbroy into @tbname
- while @@fetch_status=0
- begin
-
- declare @colname varchar(100)
- declare colroy cursor for select name from syscolumns
- where id=object_id(@tbname) and xtype in (
- select xtype from systypes
- where name in (varchar,nvarchar,char,nchar) --数据类型为字符型的字段
- ) --第二个游标是第一个游标的嵌套游标,遍历某个表的所有字段
-
- open colroy
- fetch next from colroy into @colname
- while @@fetch_status=0
- begin
-
- declare @sql nvarchar(4000),@j int
- select @sql=select @i=count(1) from +quotename(@tbname) + where + quotename(@colname)+ like +%+@string+%
- exec sp_executesql @sql,N@i int output,@i=@j output --输出满足条件表的记录数
- if @j>0
- begin
- declare @v varchar(8000)
- set @v=select distinct +quotename(@colname)+ from +quotename(@tbname) + where + quotename(@colname)+ like +%+@string+%
- exec(@v)
- end
- fetch next from colroy into @colname
- end
-
- close colroy
- deallocate colroy
-
- fetch next from tbroy into @tbname
- end
- close tbroy
- deallocate tbroy
- end
-
- exec Full_Search 市场
-
- drop proc Full_Search
-