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DAOMySQLi.class.php文件内容
<?php //开发一个dao 数据库操作类[单例模式] 【oop, mysqli, 编程思想】 class DAOMySQLi { //dao 应该有哪些属性 private $_host; private $_user; private $_pwd; private $_dbname; private $_port; //字符集 private $_charset; //有一个mysqli对象实例 private $_mySQLi; //有个第一个唯一实例的属性 private static $_instance; //该函数完成一个初始化成员属性的任务 private function _initOption(array $option = array()){ //将传入的 数组 $option 的值赋给 成员属性, 并简单校验 $this->_host = isset($option['host']) ? $option['host'] : ''; $this->_user = isset($option['user']) ? $option['user'] : ''; $this->_pwd = isset($option['pwd']) ? $option['pwd'] : ''; $this->_dbname = isset($option['dbname']) ? $option['dbname'] : ''; $this->_port = isset($option['port']) ? $option['port'] : ''; $this->_charset = isset($option['charset']) ? $option['charset'] : ''; if($this->_host == '' || $this->_user == '' || $this->_pwd == '' || $this->_dbname == '' || $this->_port == '' || $this->_charset == ''){ die('你的传入的参数有问题，请重新输入'); } } //写一个函数，完成对_mySQLi对象初识化 private function _initMySQLi(){ //创建mysqli对象实例 $this->_mySQLi = new MySQLi($this->_host, $this->_user, $this->_pwd, $this->_dbname, $this->_port); if($this->_mySQLi->connect_errno){ die('你的连接失败, 错误信息' . $this->_mySQLi->connect_error); } //设置字符集 $this->_mySQLi->set_charset($this->_charset); } //构造函数, 完成初始化 private function __construct(array $option = array()){ //echo '<pre> __construct'; //该函数完成一个初始化成员属性的任务 $this->_initOption($option); $this->_initMySQLi(); } //对外提供一个静态的public方法，可以返回一个唯一的对象实例 public static function getSingleton(array $option = array()){ //如果还没有创建这个对象实例 if(!(self::$_instance instanceof self)){ //创建对象实例, 这里就是构造函数 self::$_instance = new self($option); } //返回对象实例 return self::$_instance; } //防止克隆 private function __clone(){ } //对外提供一个方法(接口), 完成查询任务(select) public function fetchAll($sql = ''){ //为了达到这样的目录 //1. 立即释放$res //2. 需要把这个结果返回给调用文件使用 //思路是将 $res 记录封装到一个数组中，将数组返回. //定义一个空数组，准备装记录 $arr = array(); $res = $this->_mySQLi->query($sql); while($row = $res->fetch_assoc()){ $arr[] = $row; } //立即释放 $res; $res->free(); return $arr; } //对外提供一个dml操作的方法(接口), 完成(dml操作) public function query($sql = ''){ $res = $this->_mySQLi->query($sql); if(!$res){ echo '<br>执行sql语句失败'; echo '错误信息'. $this->_mySQLi->error; exit; } return $res; } }
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注意事项 时区设置，在php.ini文件中找到data.timezone开启即可
data_default_timezone_set('PRC');
