php教程数据操作部分
php教程数据操作部分语法代码如下：
<?php
class MyPDO{
private $type; //数据库类别
private $host; //主机地址
private $port; //端口号
private $dbname; //数据库名
private $charset; //字符集
private $user; //用户名
private $pwd; //密码
private $pdo; //保存PDO对象
private static $instance;
private function __construct($param) {
$this->initParam($param);
$this->initPDO();
$this->initException();
}
private function __clone() {
}
public static function getInstance($param=array()){
if(!self::$instance instanceof self)
self::$instance=new self($param);
return self::$instance;
}
//初始化参数
private function initParam($param){
$this->type=$param['type']??'mysql';
$this->host=$param['host']??'127.0.0.1';
$this->port=$param['port']??'3306';
$this->dbname=$param['dbname']??'data';
$this->charset=$param['charset']??'utf8';
$this->user=$param['user']??'root';
$this->pwd=$param['pwd']??'root';
}
//初始化PDO
private function initPDO(){
try{
$dsn="{$this->type}:host={$this->host};port={$this->port};dbname={$this->dbname};charset={$this->charset}";
$this->pdo=new PDO($dsn, $this->user, $this->pwd);
} catch (PDOException $ex) {
$this->showException($ex);
exit;
}
}
//显示异常
private function showException($ex,$sql=''){
if($sql!=''){
echo 'SQL语句执行失败<br>';
echo '错误的SQL语句是：'.$sql,'<br>';
}
echo '错误编号：'.$ex->getCode(),'<br>';
echo '错误行号：'.$ex->getLine(),'<br>';
echo '错误文件：'.$ex->getFile(),'<br>';
echo '错误信息：'.$ex->getMessage(),'<br>';
}
//设置异常模式
private function initException(){
$this->pdo->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
}
//执行增、删、改操作
public function exec($sql){
try{
return $this->pdo->exec($sql);
} catch (PDOException $ex) {
$this->showException($ex, $sql);
exit;
}
}
//获取自动增长的编号
public function lastInsertId(){
return $this->pdo->lastInsertId();
}
}
//测试
$param=array(
);
$mypdo= MyPDO::getInstance($param);
//echo $mypdo->exec('delete from news where id=6');
if($mypdo->exec("insert into news values (null,'11','1111',unix_timestamp())"))
echo '自动增长的编号是：'.$mypdo->lastInsertId ();
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