自动生成索引的脚本-mysql教程-PHP中文网

自动生成索引的脚本

php中文网

发布： 2016-06-07 16:32:04

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写了个自动建索引的脚本，基本原理是解析SQL的条件，然后得出每个条件的运算符，最后通过优先级矩阵将可以建索引的列排序求最长的序列，也就是尽可能把更多的列包含进索引。

使用方法：
./AutoCreateIndex.pl -e “你的SQL”

对于多表连接，务必将列名前跟上表名，否则无法处理，因为脚本并不连接数据库，无法判断哪个列属于那个表。
测试版本，Bug很多，欢迎提供意见。

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下面是一些例子

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<span style="color: #993333; font-weight: bold;">ALTER</span> <span style="color: #993333; font-weight: bold;">TABLE</span> foo2 <span style="color: #993333; font-weight: bold;">ADD</span> <span style="color: #993333; font-weight: bold;">INDEX</span> idx <span style="color: #66cc66;">&#40;</span>col2<span style="color: #66cc66;">,</span>col3<span style="color: #66cc66;">,</span>col1<span style="color: #66cc66;">&#41;</span>;
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<span style="color: #993333; font-weight: bold;">ALTER</span> <span style="color: #993333; font-weight: bold;">TABLE</span> t1 <span style="color: #993333; font-weight: bold;">ADD</span> <span style="color: #993333; font-weight: bold;">INDEX</span> idx <span style="color: #66cc66;">&#40;</span>t2<span style="color: #66cc66;">,</span>t1<span style="color: #66cc66;">&#41;</span>;
plx@plinux<span style="color: #66cc66;">-</span>Laptop:~<span style="color: #66cc66;">/</span>Dropbox<span style="color: #66cc66;">/</span>MySQLScript$ <span style="color: #66cc66;">./</span>AutoCreateIndex<span style="color: #66cc66;">.</span>pl <span style="color: #66cc66;">-</span>e <span style="color: #ff0000;">"SELECT * FROM t1 where col1=1 and col2=4"</span>
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