Home Database Mysql Tutorial MySQL全文搜索索引字段的作用

MySQL全文搜索索引字段的作用

Jun 07, 2016 pm 03:07 PM
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MySQL全文搜索索引的字段来对搜索效率进行提高在实际中的应用还是比较多的,如果你对这一技术,心存好奇的话,以下的文章将会揭开它的神秘面纱,希望会给你带来一些帮助在此方面。 一个SELECT查询中的LIKE语句来执行这种查询,尽管这种方法可行,但对于全文

  MySQL全文搜索索引的字段来对搜索效率进行提高在实际中的应用还是比较多的,如果你对这一技术,心存好奇的话,以下的文章将会揭开它的神秘面纱,希望会给你带来一些帮助在此方面。

  一个SELECT查询中的LIKE语句来执行这种查询,尽管这种方法可行,但对于全文查找而言,这是一种效率极端低下的方法,尤其在处理大量数据的时候。

  开发者只需要简单地标记出需要全文查找的字段,然后使用特殊的MySQL(和PHP搭配之最佳组合)方法在那些字段运行搜索,这不仅仅提高了性能和效率(因为MySQL(和PHP搭配之最佳组合)对这些字段做了索引来优化搜索),而且实现了更高质量的搜索,因为MySQL(和PHP搭配之最佳组合) 使用自然语言来智能地对结果评级,以去掉不相关的项目。

  建表:

  ALTER TABLE 表名 ADD FULLTEXT INDEX (表字段);

  使用SHOW INDEXES命令来检查索引已经被添加

  拥有了数据和索引,就可以使用MySQL(和PHP搭配之最佳组合)的全文搜索了,最简单的全文搜索方式是带有MATCH...AGAINST语句的SELECT查询:

  SELECT 表字段 FROM 表名 WHERE MATCH (全文搜索表字段) AGAINST ('搜索字符串');

  最后显示结果。

  以上的相关内容就是对MySQL全文搜索索引的字段提高搜索效率的介绍,望你能有所收获。

 

MySQL全文搜索索引字段的作用

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