存储过程中使用Like

文章来自：CSDN-xiayuzhongdexiaotan的专栏

SET QUOTED_IDENTIFIER ON 
GO
SET ANSI_NULLS OFF 
GO
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[GetOperationLogs]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop procedure [dbo].[GetOperationLogs]
GO


/* 查询Voltage_Dist_Data的存储过程 */
create procedure GetOperationLogs
(
  @useridList varchar(500),  
  @BeginTime datetime,
  @EndTime datetime,
  @description varchar(500)
)
as
begin
  declare @s varchar(2000)
  set @s='select * from d_lg_6'
  /* 如果没有设置任何查询条件,在返回所有的operationlogs */
  if ((@useridList=null)and(@BeginTime=null)and(@EndTime=null)and(@Description=null))
  begin
      exec(@s)
      return
  end      
  set @s=@s+' where '
  /*如果设置了useridList，则返回这些用户的OperationLogs */
  if (@useridList!=null)
      set @s=@s+' userid in ('+@useridList+') and '
  /*如果设置了查询时间，则返回该时间那的查询时间*/
  if ((@BeginTime!=null)and(@EndTime!=null))
      set @s=@s+' logtime between '''+convert(varchar(19),@BeginTime,120)+''' and '''+convert(varchar(19),@endtime,120)+''' and '
  /*如果设置了日志内容过滤器，则过滤日志内容 */
  if (@Description!=null)
      set @s=@s+' Description like ''%'+@Description+'%'''
  if (substring(@s,len(@s)-2,3)='and')
      set @s=substring(@s,0,len(@s)-3)
  exec(@s)
  --select @s
  --select substring(@s,len(@s)-2,3)
end
GO
SET QUOTED_IDENTIFIER OFF 
GO
SET ANSI_NULLS ON 
GO 

这里的关键还是 两个单眼号的连续使用，注意观察

if (@Description!=null)
　　set @s=@s+' Description like ''%'+@Description+'%'''

这里%旁边的是两个单眼号，而不是双眼号；

select * from Book where BookName   like '%'+@BookName+'%'