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