SQL中游标的使用示例

       declare @email_source varchar(MAX);                       --1.原始发件人字段
       declare @key_name varchar(50);                            --2.我方卷号或客户代码
             declare c_cur cursor for select distinct vc_your_email,vc_our_ref_or_code from #ip_special_email_total where vc_your_email like '%@%' order by vc_our_ref_or_code;
             open c_cur;
             fetch next from c_cur into @email_source,@key_name;
         while (@@FETCH_STATUS = 0)
           begin
             declare @split_str varchar(50)    --分隔符
             declare @pos int                  --当前位置
             declare @split_len int            --分隔符长度
             declare @split_index int          --最近的分隔符位置
             declare @split_last_index int     --上次分隔符位置
             declare @avc_email varchar(500)

             set @split_str = ';'              --指定分隔符
             set @pos = 1
             set @split_len = len(@split_str)
             set @split_index = 0
             set @split_last_index = 0

             while (@pos <= len(@email_source))
               begin
                 if @split_index > 0 set @split_last_index = @split_index
                 set @split_index = charindex(@split_str, @email_source, @pos)
                 set @pos = @pos + @split_len
                 if @pos = len(@email_source) set @split_index = @pos + @split_len
                 if @split_index > @split_last_index
                   begin
                     set @avc_email = substring(@email_source,(@split_last_index + @split_len),(@split_index - @split_last_index - @split_len))
                     if isnull(@avc_email,'')<>'' insert #ip_single_email_total select @avc_email,@key_name
                   end
               end
             fetch next from c_cur into @email_source,@key_name;
           end
             close c_cur
             deallocate c_cur