在开发PHP的过程中由于时常要用到数据库操作，因此写一个数据库操作的类也是必须的。下面这个类可以通过具有参数的数组来构建MySQL查询语句，通过指定的表和字段参数创建SELECT ,INSERT , UPDATE和DELETE语句，创建SQL语句的WHERE条件，像LIKE的查询语句，使用LEFT JOIN和ORDER 语句。-In the process of the development of PHP due to the frequent use of　operations, so write a　of the operation of the class is also a must. Below this class can with the parameters of the array to build MySQL query, by creating a specified table and field parameters select, insert, update and delete statements to create SQL where clause conditions, like like query using a left join and order statement.