SqlServer 存储过程 if else 两层判断 语句拼接

今天自己摸索写了一个sql的存储过程，两层if 判断，语句拼接，backup

语句模式有两种，一种是Create New 还有一种是Modify ，下面的是第一种

 

要提示的是，写语句的时候 单引号的引用：用到单引号的一律两个单引号代替

 

USE [a] GO /****** Object: StoredProcedure [a].[Processname] Script Date: 02/24/2011 11:49:55 ******/ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO -- ============================================= -- Author: <Author,Name> -- Create date: <Create Date,> -- Description: <Description,> -- ============================================= CREATE PROCEDURE [a].[Processname] @FromDateTime varchar(200),@ToDateTime varchar(200),@CountryCode varchar(200),@Version varchar(200) AS declare @<a href="/tag/sql/" target="_blank" class="keywords">sql</a> varchar(1000) set @<a href="/tag/sql/" target="_blank" class="keywords">sql</a>='select AccessDateTime,IpAddress,Area,AreaDetail as description,City,Version from a.TableName where AccessDateTime between ''' + @FromDateTime+''' and '''+ @ToDateTime+'''' BEGIN if(@CountryCode='') begin set @<a href="/tag/sql/" target="_blank" class="keywords">sql</a>=@<a href="/tag/sql/" target="_blank" class="keywords">sql</a> if(@Version='') begin set @<a href="/tag/sql/" target="_blank" class="keywords">sql</a> = @<a href="/tag/sql/" target="_blank" class="keywords">sql</a> +' order by id desc' end else begin set @<a href="/tag/sql/" target="_blank" class="keywords">sql</a> = @<a href="/tag/sql/" target="_blank" class="keywords">sql</a> + ' and Version='''+@Version +''' order by id desc' end end else begin set @<a href="/tag/sql/" target="_blank" class="keywords">sql</a>=@<a href="/tag/sql/" target="_blank" class="keywords">sql</a> if(@Version='') begin set @<a href="/tag/sql/" target="_blank" class="keywords">sql</a>=@<a href="/tag/sql/" target="_blank" class="keywords">sql</a> +' and Area='''+@CountryCode+''' order by id desc' end else begin set @<a href="/tag/sql/" target="_blank" class="keywords">sql</a>=@<a href="/tag/sql/" target="_blank" class="keywords">sql</a> +' and Area='''+@CountryCode+''' and Version='''+ @Version +''' order by id desc' end end exec(@<a href="/tag/sql/" target="_blank" class="keywords">sql</a>) END