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PHP PDO操作API
发表于 2015-8-31 | PHP
<?php

/**
 *	DB驱动
 *	@author  Devil
 *	@version v_0.0.1
 */
class DBLibrary
{
	private $obj;

	/**
	 * [__construct 构造方法]
	 * @param [string]  $host    [连接地址]
	 * @param [string]  $name    [数据库名]
	 * @param [string]  $user    [用户名]
	 * @param [string]  $pwd     [用户密码]
	 * @param [boolean] $connect [是否长连接]
	 */
	private function __construct($host, $name, $user, $pwd, $connect)
	{
		if(empty($host) || empty($name) || empty($user) || empty($pwd)) exit('Param Error');
		try
		{
			$charset = C('charset');
			$charset = empty($charset) ? 'utf8' : str_replace('-', '', $charset);
			@$this->obj = new PDO("mysql:dbname={$name};host={$host};charset={$charset}", $user, $pwd, array(PDO::ATTR_PERSISTENT=>$connect));

			/* 属性设置 */
			$this->obj->setAttribute(PDO::ATTR_CASE, PDO::CASE_NATURAL);
		}
		catch(PDOException $e)
		{
			exit('DB Connect Fails');
		}
	}

	/**
	 * [SetInstance 静态方法]
	 * @param string $type [请求类型]
	 */
	public static function SetInstance($host, $name, $user, $pwd, $connect = false)
	{
		static $object = null;
		if(!is_object($object)) $object = new self($host, $name, $user, $pwd, $connect);
		return $object;
	}

	/**
	 * [Query 查询数据对象]
	 * @param  [string] $sql [sql查询语句]
	 * @return [obj] [对象]
	 */
	private function Query($sql)
	{
		if(empty($sql)) return '';
		try
		{
			$rs = $this->obj->query($sql);
			if(!is_object($rs)) exit('DB Non Object Error');
			$rs->setFetchMode(PDO::FETCH_ASSOC);
			return $rs;
		}
		catch(PDOException $e)
		{
			exit('DB Resources Error');
		}
	}

	/**
	 * [GetAll 获取所有数据]
	 * @param  [string] $sql [sql查询语句]
	 * @return [array|空字符串] [二维数组或空字符串]
	 */
	public function GetAll($sql)
	{
		$data = $this->Query($sql)->fetchAll();
		return empty($data) ? '' : $data;
	}

	/**
	 * [GetRow 获取一行的数据]
	 * @param  [string] $sql [sql查询语句]
	 * @return [array|空字符串] [一维数组或空字符串]
	 */
	public function GetRow($sql)
	{
		$data = $this->Query($sql)->fetch();
		return empty($data) ? '' : $data;
	}

	/**
	 * [GetOne 获取一个字段的数据]
	 * @param  [string] $sql [sql查询语句]
	 * @return [string|空字符串] [字符串或空字符串]
	 */
	public function GetOne($sql)
	{
		$data = $this->Query($sql)->fetchColumn();
		return empty($data) ? '' : $data;
	}

	/**
	 * [GetCol 获取所有数据的一列数据]
	 * @param  [string] $sql [sql查询语句]
	 * @return [array|空字符串] [一维数组或空字符串]
	 */
	public function GetCol($sql)
	{
		if(empty($sql)) return '';
		$data = array();
		$rs = $this->obj->query($sql);
		$rs->setFetchMode(PDO::FETCH_NUM);
		while($row = $rs->fetch())
		{
			$data[] = $row[0];
		}
		return empty($data) ? '' : $data;
	}

	/**
	 * [Exec 数据更新 删除]
	 * @param  [string] $sql [sql操作语句]
	 * @return [boolean] [成功true, 失败false]
	 */
	public function Exec($sql)
	{
		if($this->obj->exec($sql)) return true;
		return false;
	}

	/**
	 * [Insert 数据插入]
	 * @param  [string] $sql [sql插入语句]
	 * @return [int] [成功返回自增id(表无自增id则0), 失败-1]
	 */
	public function Insert($sql)
	{
		if($this->obj->exec($sql)) return $this->obj->lastInsertId();
		return -1;
	}

	/**
	 * [StartTrans 开启事物]
	 */
	public function StartTrans()
	{
		$this->obj->beginTransaction();
	}

	/**
	 * [Commit 提交事物]
	 */
	public function Commit()
	{
		$this->obj->commit();
	}

	/**
	 * [RollBack 回滚事物]
	 */
	public function RollBack()
	{
		$this->obj->rollBack();
	}
}

?>

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