MysqPdo封装代码,MYSQL代码库,德仔网

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【MYSQL】 MysqPdo封装
作者:步山 / 发布于2014/11/10/ 666

	<?php
	class Waf_Db_Adapter_MysqlPdo extends Waf_Db_Abstract{
	 /**
	 * PDO对象
	 *
	 * @access private
	 * @var Waf_Db
	 */
	 private $_pdo;
	 /**
	 * PDO statement 对象
	 *
	 * @access private
	 * @var Waf_Db
	 */
	 private $_query;
	 /**
	 * 连接表示
	 *
	 * @access private
	 * @var Waf_Db
	 */
	 private $_connected = false;
	 /**
	 * 参数
	 *
	 * @access private
	 * @var array
	 */
	 private $_parameters = array();
	 /**
	 * 构造器
	 *
	 * @access public
	 */
	 public function __construct(array $options){
	 parent::__construct($options);
	 /** 连接数据库 */
	 $this->connect();
	 }
	 /**
	 * 连接数据库
	 *
	 * @access protected
	 */
	 protected function connect(){
	 if(!class_exists('PDO')) $this->halt('不支持PDO扩展！');
	 try{
	 $this->_pdo = new PDO(
	 'mysql:dbname='.$this->options["dbName"].';host='.$this->options["host"].';port='.$this->options['port'],
	 $this->options["user"],
	 $this->options["password"],
	 array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8")
	 );
	 $this->_pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
	 $this->_pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
	 $this->_connected = true;
	 }catch (PDOException $e){
	 $this->halt('不能链接Mysql数据库 .Error:'.$e->getMessage());
	 }
	 }

	 /**
	 * 初始化.
	 *
	 * @param stirng $sql
	 * @param array|string $parameters
	 * @return void
	 */
	 private function _init($sql ,$parameters = ""){
	 if(!$this->_connected) $this->connect();
	 try {
	 $this->_query = $this->_pdo->prepare($sql);
	 $this->bindMore($parameters);
	 if(!empty($this->_parameters)) {
	 foreach($this->_parameters as $key=>$value){
	 switch( true ) {
	 case is_int($value):
	 $type = PDO::PARAM_INT;
	 break;
	 case is_bool($value):
	 $type = PDO::PARAM_BOOL;
	 break;
	 case is_null($value):
	 $type = PDO::PARAM_NULL;
	 break;
	 default:
	 $type = PDO::PARAM_STR;
	 }
	 $this->_query->bindParam($key ,$this->_parameters[$key] ,$type);
	 }
	 }
	 $this->_parameters = array();
	 return $this->_query->execute();
	 }catch(PDOException $e){
	 $this->halt($e->getMessage() ,$this->_query->queryString);
	 }
	 }

	 /**
	 * 绑定数据
	 *
	 * @param string $para
	 * @param string $value
	 */
	 public function bind($para, $value){
	 $this->_parameters[":" . $para] = $value;
	 }
	 /**
	 * 绑定数据
	 *
	 * @param array $parray
	 */
	 public function bindMore($parray){
	 if(empty($this->_parameters) && is_array($parray)) {
	 foreach($parray as $key => &$value) {
	 $this->bind($key, $parray[$key]);
	 }
	 }
	 }
	 /**
	 * 一些简单的操作
	 *
	 * @param string $sql
	 * @param array $params
	 * @param int $mode
	 * @return mixed
	 */
	 public function query($sql,$params = NULL, $mode = PDO::FETCH_ASSOC){
	 $sql = trim($sql);
	 if($params){
	 $this->_init($sql ,$params);
	 return $this->_query->fetchAll($mode);
	 }else{
	 $sql = str_replace('`waf_' ,'`'.$this->options['prefix'] ,$sql);
	 return $this->_pdo->exec($sql);
	 }
	 return false;
	 }

	 /**
	 * 根据查询取出所有资料
	 *
	 * @param string $sql
	 * @param mixed $params
	 * @return array
	 */
	 public function fetchAll($sql ,array $params = NULL){
	 $this->_init($sql ,$params);
	 $result = array();
	 while($row = $this->_query->fetch(PDO::FETCH_ASSOC)){
	 $result[] = $row;
	 }
	 return $result;
	 }
	 /**
	 * 查询单条数据
	 *
	 * @param string $sql
	 * @param mixed $params
	 * @return array
	 */
	 public function fetchOne($sql ,array $params = NULL){
	 $this->_init($sql ,$params);
	 $result = $this->_query->fetch(PDO::FETCH_ASSOC);
	 return $result;
	 }
	 /**
	 * 获取总数量
	 *
	 * @param string $sql
	 * @param array $params
	 * @return int
	 */
	 public function getCount($sql ,$params = NULL){
	 $this->_init($sql ,$params);
	 $result = $this->_query->fetch(PDO::FETCH_NUM);
	 return $result[0];
	 }
	 /**
	 * 函数返回结果集中行的数目
	 *
	 * @param string $sql
	 * @return int
	 */
	 public function numRows($sql) {
	 $this->_filter = array();
	 $datas = $this->fetchAll($sql);
	 $counts = count($datas);
	 unset($datas);
	 return $counts;
	 }
	 /**
	 * 函数返回结果集中字段的数
	 *
	 * @param string $sql
	 * @return int
	 */
	 public function numFields($sql) {
	 $this->_filter = array();
	 $this->_init($sql);
	 return $this->_query->columnCount() ;
	 }
	 /**
	 * 获取最后插入的ID
	 *
	 * @return mixed
	 */
	 public function insertId() {
	 try {
	 return $this->_pdo->lastInsertId();
	 }catch( PDOException $e ) {
	 $this->halt($e->getMessage() ,$this->_query->queryString);
	 return false;
	 }
	 }
	 /**
	 * 关闭连接.
	 *
	 * @access public
	 */
	 public function close(){
	 $this->_pdo = null;
	 }
	 /**
	 * 接.
	 *
	 * @access public
	 */
	 public function __destruct() {
	 $this->close();
	 }

	 /**
	 * 写入数据
	 *
	 * @param string $table
	 * @param array $data
	 * @return int
	 */
	 public function insert($table ,$data){
	 try {
	 $sql = "INSERT INTO ".table($table);
	 $columns = $values = '';
	 foreach( $data as $k=>$v ) {
	 $columns .= "$k,";
	 $values .= ":$k,";
	 }
	 $columns = trim($columns,',');
	 $values = trim($values,',');
	 $sql = $sql . " ($columns) VALUES ($values)";
	 $this->_init($sql ,$data);
	 unset($sql ,$columns ,$values);
	 return $this->insertId();
	 }catch( PDOException $e ) {
	 $this->halt($e->getMessage() ,$this->_query->queryString);
	 return false;
	 }
	 }
	 /**
	 * 更新数据
	 *
	 * @param string $table
	 * @param array $data
	 * @param mixed $wheres
	 * @return int
	 */
	 public function update($table ,$data ,$wheres = NULL){
	 $sql = "UPDATE ".table($table)." SET ";
	 foreach($data as $key=>$value){
	 if(is_array($value)){
	 $sql .= "`{$key}` = ".$key . $value[0] . $value[1] . ',';
	 unset($data[$key]);
	 }else{
	 $sql .= "`{$key}`=:{$key},";
	 }
	 }
	 $sql = trim($sql ,',');
	 if(is_array($wheres) && !empty($wheres)){
	 $where = '';
	 foreach($wheres as $key=>$value){
	 $where .= "`{$key}`=:{$key} AND ";
	 }
	 $where = trim($where ,' AND ');
	 $sql .= " WHERE {$where}";
	 $data = array_merge($data ,$wheres);
	 unset($where ,$wheres);

	 }else{
	 $sql .= " WHERE {$wheres}";
	 }
	 $this->_init($sql ,$data);
	 unset($sql);
	 return $this->_query->rowCount();
	 }
	 /**
	 * 删除数据
	 *
	 * @param string $table
	 * @param array|string $wheres
	 * @return int
	 */
	 public function delete($table ,$wheres = NULL){
	 $sql = "DELETE FROM ".table($table).' WHERE ';
	 if(is_array($wheres)){
	 foreach($wheres as $key => $value){
	 $sql .= "`{$key}`=:{$key} AND ";
	 }
	 $sql = trim($sql ,' AND ');
	 }else{
	 $sql .= $wheres;
	 }
	 $this->_init($sql ,$wheres);
	 unset($sql);
	 return $this->_query->rowCount();
	 }

	}
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