Rumah >pembangunan bahagian belakang >tutorial php >PHP+MYSQL 多关键词+模糊搜索+匹配度排序,请教怎么实现?
mysql php 模糊搜索 排序
已经用MYSQL 的 UNION 实现了一个,但是效率太差,请教论坛上的高人有没有更好的方法。将你的表结构贴和sql贴出来
sql:
(SELECT a.`askid`,a.`catid`,a.`title`,a.`status`,a.`addtime`,a.`reward`,a.`answercount`,b.`message` FROM `phpcms_ask` a LEFT JOIN `phpcms_ask_posts` b ON a.`askid`=b.`askid` WHERE (a.status=3 OR a.status=5) AND (LOCATE('中国北京天安门',a.`title`)>0) AND b.`isask`=1)UNION (SELECT a.`askid`,a.`catid`,a.`title`,a.`status`,a.`addtime`,a.`reward`,a.`answercount`,b.`message` FROM `phpcms_ask` a LEFT JOIN `phpcms_ask_posts` b ON a.`askid`=b.`askid` WHERE (a.status=3 OR a.status=5) AND (LOCATE('中国',a.`title`)>0 AND LOCATE('北京',a.`title`)>0 AND LOCATE('天安门',a.`title`)>0) AND b.`isask`=1) UNION (SELECT a.`askid`,a.`catid`,a.`title`,a.`status`,a.`addtime`,a.`reward`,a.`answercount`,b.`message` FROM `phpcms_ask` a LEFT JOIN `phpcms_ask_posts` b ON a.`askid`=b.`askid` WHERE (a.status=3 OR a.status=5) AND (LOCATE('中国',a.`title`)>0 AND LOCATE('北京',a.`title`)>0) AND b.`isask`=1)UNION(SELECT a.`askid`,a.`catid`,a.`title`,a.`status`,a.`addtime`,a.`reward`,a.`answercount`,b.`message` FROM `phpcms_ask` a LEFT JOIN `phpcms_ask_posts` b ON a.`askid`=b.`askid` WHERE (a.status=3 OR a.status=5) AND (LOCATE('北京',a.`title`)>0 AND LOCATE('天安门',a.`title`)>0) AND b.`isask`=1)UNION(SELECT a.`askid`,a.`catid`,a.`title`,a.`status`,a.`addtime`,a.`reward`,a.`answercount`,b.`message` FROM `phpcms_ask` a LEFT JOIN `phpcms_ask_posts` b ON a.`askid`=b.`askid` WHERE (a.status=3 OR a.status=5) AND (LOCATE('中国',a.`title`)>0 OR LOCATE('北京',a.`title`)>0 OR LOCATE('天安门',a.`title`)>0) AND b.`isask`=1)LIMIT 0,20
phpcms_ask表: askid catid title tags reward userid username addtime endtime status flag answercount anonymity hits ischeck
phpcms_ask_posts表:pid askid isask message addtime reply rptime candidate optimal reversion userid status anonymity username
既然你不需要计算出现的次数,那么合起来不是更好
SELECT a.`askid`,a.`catid`,a.`title`,a.`status`,a.`addtime`,a.`reward`,a.`answercount`,b.`message` FROM `phpcms_ask` a LEFT JOIN `phpcms_ask_posts` b ON a.`askid`=b.`askid` WHERE (a.status=3 OR a.status=5) AND b.`isask`=1 AND (LOCATE('中国',a.`title`)>0 OR LOCATE('北京',a.`title`)>0 OR LOCATE('天安门',a.`title`)>0)
若要计算匹配度,也只需
select sign(LOCATE('中国',a.`title`))+sign(LOCATE('北京',a.`title`))+sign(LOCATE('天安门',a.`title`)) as 匹配数 from ...
既然你不需要计算出现的次数,那么合起来不是更好
SQL code?123SELECT a.`askid`,a.`catid`,a.`title`,a.`status`,a.`addtime`,a.`reward`,a.`answercount`,b.`message` FROM `phpcms_ask` a LEFT JOIN `phpcms_ask_posts` b……
感谢版主,您的方法非常有效!!现在速度快了很多。
匹配度排序该如何实现呢
若要计算匹配度,也只需
select sign(LOCATE('中国',a.`title`))+sign(LOCATE('北京',a.`title`))+sign(LOCATE('天安门',a.`title`)) as 匹配数 from ...
版主 请问:按指定的??字在字段中出?的次?排序 该如何实现呢? 只在一个字段中查询