-- pageSize=3 pageIndex total=7

-- 开始行号 startRowNum=(pageIndex-1)*pageSize+1;

-- 结束行号 endRowNum=pageIndex*pageSize

-- 总页数 (total+pageSize-1)/pageSize

select *  from (

SELECT `code`,cname,@rownum:=@rownum+1 as row_num FROM `dic_town`,(select @rownum:=0) t

)as a where 1=1 and  a.row_num BETWEEN 1 and 3;

select count(*) from `dic_town`;

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