sql搜索功能问题，LIKE和MATCH答案

【问题标题】：sql search function issue, LIKE and MATCHsql搜索功能问题，LIKE和MATCH
【发布时间】：2014-06-13 11:16:25
【问题描述】：

我必须解决其他人的代码中的一个问题，即搜索函数返回太多结果，我注意到它使用 MATCH

我的SQL不太好，我把所有的MATCH都改成了LIKE的..

这显然带来了一个错误，我认为它与 AGAINST 有关，我不确定但可能只与 MATCH 一起工作..

这是asp代码中的语句。

    strSQL = ""
        strSQL  = "SELECT 'case-studies' AS pagetype, cs.title AS entrytitle, cs.casestudyid AS id, csi.casestudyimageid AS imageid, csi.imagetitle,  LIKE (cs.title, cs.content) AGAINST ('" & searchfor & "') AS relevance, LIKE (csi.imagetitle) AGAINST ('" & searchfor & "') AS imagerelevance "
        strSQL = strSQL & "FROM casestudies AS cs, casestudiesimages AS csi "
        strSQL = strSQL & "WHERE cs.casestudyid = csi.casestudyid AND cs.modestatus = '1' AND ((LIKE(cs.title, cs.content) AGAINST ('" & searchfor & "' IN BOOLEAN MODE)) OR (LIKE(csi.imagetitle) AGAINST ('" & searchfor & "' IN BOOLEAN MODE)) OR (cs.title like '%" & searchfor & "%') OR (cs.content like '%" & searchfor & "%') OR (csi.imagetitle like '%" & searchfor & "%')) "
        strSQL = strSQL & "UNION ALL "
        strSQL = strSQL & "SELECT 'news' AS pagetype, news.title AS entrytitle, news.newsid AS id, newsimages.newsimageid AS imageid, newsimages.imagetitle, LIKE (news.title, news.content) AGAINST ('" & searchfor & "') AS relevance, LIKE (newsimages.imagetitle) AGAINST ('" & searchfor & "') AS imagerelevance "
        strSQL = strSQL & "FROM news, newsimages "
        strSQL = strSQL & "WHERE news.newsid = newsimages.newsid AND news.modestatus = '1' AND ((LIKE(news.title, news.content) AGAINST ('" & searchfor & "' IN BOOLEAN MODE)) OR (LIKE(newsimages.imagetitle) AGAINST ('" & searchfor & "' IN BOOLEAN MODE)) OR (news.title like '%" & searchfor & "%') OR (news.content like '%" & searchfor & "%') OR (newsimages.imagetitle like '%" & searchfor & "%')) "          
        strSQL = strSQL & "GROUP BY id "
        strSQL = strSQL & "ORDER BY relevance DESC, imagerelevance DESC "

任何人都可以帮助破译这段代码.. 它需要像搜索一样搜索，而不是搜索“他”并获得“帮助”等

谢谢

【问题讨论】：

标签： sql match sql-like

【解决方案1】：

你说的是 LIKE，但你没有将你的 LIKE 与任何东西进行比较，一个有效的 LIKE 语句是

SELECT *
FROM CUSTOMERS
WHERE CUSTOMERNAME LIKE '%' + @Param+ '%'

【讨论】：

好的，我明白你的意思了，我所做的只是将 MATCH 更改为 LIKE，所以我认为这一切都是错误的......问题在于我缺乏 SQL 知识...您可以连续拥有多个 LIKE 吗？
嗨，Paul，是的，您的声明中可以有多个 LIKE。但是你总是必须像上面那样定义它。所以然后你添加AND，然后像...一样的列名，再次以同样的方式:)

【解决方案2】：

如果您使用 MyISAM 并且您希望搜索的列上有全文索引，您可以通过使用“MATCH..AGAINST”而不是 LIKE 来避免全表扫描，这样更有效.我已经在 MATCH 合适的地方替换了“LIKEs” - 然后是代码中的 AGAINST。 SQL 的一般规则是，如果要测试的表达式没有通配符（在这种情况下只有 %），请使用 MATCH。

strSQL  = "SELECT 'case-studies' AS pagetype, cs.title AS entrytitle, 
          cs.casestudyid AS id, csi.casestudyimageid AS imageid, csi.imagetitle,
          MATCH (cs.title, cs.content) AGAINST ('" & searchfor & "') AS relevance, 
          MATCH (csi.imagetitle) AGAINST ('" & searchfor & "') AS imagerelevance "
strSQL = strSQL & "FROM casestudies AS cs, casestudiesimages AS csi "
strSQL = strSQL & "WHERE cs.casestudyid = csi.casestudyid AND cs.modestatus = '1' AND
    ((MATCH (cs.title, cs.content) AGAINST ('" & searchfor & "' IN BOOLEAN MODE)) OR
    (MATCH (csi.imagetitle) AGAINST ('" & searchfor & "' IN BOOLEAN MODE)) OR 
    (cs.title LIKE '%" & searchfor & "%') OR (cs.content LIKE '%" & 
     searchfor & "%') OR (csi.imagetitle LIKE '%" & searchfor & "%')) "
strSQL = strSQL & "UNION ALL "
    strSQL = strSQL & "SELECT 'news' AS pagetype, news.title AS entrytitle, 
        news.newsid AS id, newsimages.newsimageid AS imageid, newsimages.imagetitle, 
        MATCH (news.title, news.content) 
        AGINST ('" & searchfor & "') AS relevance, 
        MATCH (newsimages.imagetitle) 
        AGAINST ('" & searchfor & "') AS imagerelevance "
    strSQL = strSQL & "FROM news, newsimages "
    strSQL = strSQL & "WHERE news.newsid = newsimages.newsid AND news.modestatus = '1'
         AND ((MATCH (news.title, news.content) 
                 AGAINST ('" & searchfor & "' IN BOOLEAN MODE)) OR
        (MATCH (newsimages.imagetitle) AGAINST ('" & searchfor & "' 
        IN BOOLEAN MODE)) OR (news.title LIKE '%" & searchfor & "%') 
        OR (news.content LIKE '%" & searchfor & "%') 
        OR (newsimages.imagetitle LIKE '%" & searchfor & "%')) "          
    strSQL = strSQL & "GROUP BY id "
    strSQL = strSQL & "ORDER BY relevance DESC, imagerelevance DESC "

【讨论】：