封装PDO操作数据库

<?php
class DatabaseHandler {
        
        /**
         * sql语句查询
         */
        public static function query_data ($dataName,$sql,$query=array()) {
            $result = array();
            if (!empty($sql)) {
                $data = Bj_PdoDB::factory($dataName)->allPrepare($sql, $query);
                if  (!$data->isEmpty()) {
                    $result = $data->data;
                }
            }
            return $result;
        }
        
        /**
         * 查询数据
         */
        public static function select_data ($dataName,$tableName,$where,$param=array(),$desc='') {
            $result = array();
            $query = array();
            $query_str = '1=1';
            $tmp = '';
            $str_arr = '';
            if (!empty($param)) {
                $str = '';
                foreach ($param as $val) {
                    $str .= '`'.$val.'`,';
                }
                $str = substr($str,0,-1);
            }
            $str_arr = !empty($str) ? $str : '*';
            
            if ( !empty($where) ) {
                foreach ($where as $key => $value) {
                    $tmp .= ' AND '.$key.'=:'.$key.'';
                    $query[':'.$key] = $value;
                }
            }
            $query_str .= $tmp;
            if (!empty($desc)) {
                $query_str .= $desc;
            }
            $sql = "SELECT {$str_arr} FROM `".$tableName."` WHERE {$query_str} ";
            $query_data = Bj_PdoDB::factory($dataName)->allPrepare($sql, $query);
            if ( !$query_data->isEmpty() ) {
                $result = $query_data->data;
            }
            return $result;
        }

        /**
         * 批量添加信息
         */
        public static function insert_data($dataName,$tableName,$add_param){
            $flag = false;
            if (!empty($add_param)) {
                $fileds = array();
                $str = '';
                foreach($add_param as $k=>$val){
                    $str .= '(';
                    $i = 0;
                    foreach ($val as $key=>$vl) {
                        $fileds[$i] = '`'.$key.'`';
                        $str .= "'".addslashes($vl)."',";
                        $i++;
                    }
                    $str = substr($str,0,-1);
                    $str .= '),';
                }
                $filed_str = implode(',',$fileds);
                $val_str = substr($str,0,-1);
                $sql = "INSERT INTO `".$tableName."` ({$filed_str}) VALUES {$val_str}";
                $ret = Bj_PdoDB::factory($dataName)->insertPrepare($sql);
                if ( !$ret->isEmpty() ) {
                        $insertId = $ret->data;
                        if($insertId > 0){
                            return $insertId;
                        }
                }
            }
            return $flag;
        }
    
    /**
     * 删除数据
     */
    public static function delete_data ($dataName,$tableName,$id) {
        $query = array(':id' => $id);
        $sql = "DELETE FROM ". $tableName. " WHERE `id`=:id";
        $db_res = Bj_PdoDB::factory($dataName)->simplePrepare($sql,$query);
        return $db_res->data;
    }

    /**
     * 更新数据
     */
    public static function update_data ($dataName,$tableName,$id,$array) {
        $flag = false;
        if ( !empty($array) && !empty($id)) {
            $query = array(':id' => $id);
            $up_str = '';
            foreach($array as $key=>$val) {
                $query[':'.$key] = addslashes($val);
                $up_str .= '`'.$key.'`=:'.$key.',';
            }
            $up_str = substr($up_str,0,-1);
            $sql = "UPDATE `".$tableName."` SET ".$up_str." WHERE `id`=:id";
            $db_res = Bj_PdoDB::factory($dataName)->changePrepare($sql, $query);
            $flag = true;
        }
        return $flag;
    }
    
    /**
     * 事务
     */
    public static function transactionHandler($dataName,$type){
        switch ($type) {
            case 'begin':
                return Bj_PdoDB::factory($dataName)->beginTransaction();
                break;
            case 'commit':
                return Bj_PdoDb::factory($dataName)->commit();
                break;
            case 'rollback':
                return Bj_PdoDb::factory($dataName)->rollback();
                break;
            default :
                exit;
        }
    }
    
    /**
     * curl获取数据get
     */
    public static function curl_data ($curl_url){
        if (!empty($curl_url)) {
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, $curl_url); 
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
            curl_setopt($ch, CURLOPT_HEADER, 0); 
            $output = curl_exec($ch); 
            curl_close($ch);
            return $output;
        }
        return false;
    }
    
    /**
     * curl提交数据
     */
    public static function curl_data_post ($ch_url,$param) {
        $result = array();
        if (!empty($ch_url) && !empty($param)) {
            $query_string = http_build_query($param);
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, $ch_url);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
            curl_setopt($ch, CURLOPT_POST,1); 
            curl_setopt($ch, CURLOPT_POSTFIELDS, $query_string);
            curl_setopt($ch, CURLOPT_HTTPHEADER,array("application/x-www-form-urlencoded; charset=UTF-8"));
            $output = curl_exec($ch); 
            curl_close($ch);
            $result = !empty($output) ? json_decode($output,true) : array();
        }
        return $result;
    }
}

 数据库连接就自己写吧。