实现PHP框架系列文章(6)mysql数据库方法_php实例
实现一个mysql数据库封装需要考虑的问题
1.使用方便性
采用直接sql语句操作方式。只要会写sql语句,那么将没有其他学习成本。
uctphp框架提供的dba辅助封装类,用会之后将爱不释手。
使用前需要显示初始化并连接到数据库吗,当然不需要。
直到执行第一条sql语句之前,都不会去连接数据库,甚至不会new一个db对象。
dba将会在合适的时机去连接数据库并执行初始化字符编码操作。
查询语句。不需要new一个查询构造器也不提供链式操作方式,那样复杂且低效。
dba提供了以下的查询辅助函数。
//读一个值 Dba::readOne($sql); //读一行 Dba::readRowAssoc($sql); //读所有行 Dba::readAllAssoc($sql); //读所有行的第一列 Dba::readAllOne($sql); //在实际业务场景中,经常会有分页读取部分数据的情况。 //只要一个函数即可返回指定页码的数据内容和数据总条数 Dba::readCountAndLimit($sql, $page, $limit);
ps:以上部分函数可以提供一个map函数对返回数组的每一行进行加工处理。
写语句。为什么要区分read和write呢,显然可以扩展做到控制读写分离,双写等功能。
在有各种云数据库和数据库中间件的今天,在数据库层实现是更好的选择。
Dba::write($sql); /* 直接插入或更新kv形式的array数组 会自动对value进行转义,也支持array类型的值。 如果自己写sql语句要注意使用addslashes或mysql_real_escape_string来保证安全 */ Dba::insert($table, $insert); Dba::update($table, $update, $where); /* 对批量插入数据有更高的效率 当然过多的行数应该用array_chunk来分批插入。 */ Dba::insertS($table, $inserts);
2. 事务
使用pdo支持事务
Dba::beginTransaction(); Dba::commit(); Dba::rollBack();
3. 长时间运行
在一些需要长时间运行的场景如swoole服务,后台worker等,可能会出现数据库连接超时的情况。
当发现数据库连接超时,dba将会自动尝试重连。
以上内容是小编给大家介绍的PHP框架系列文章(6)mysql数据库方法,希望对大家有所帮助!

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