<?php
/* vim: set expandtab tabstop=4 shiftwidth=4: */
// +----------------------------------------------------------------------+
// | PHP version 5                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2004 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 3.0 of the PHP license,       |
// | that is bundled with this package in the file LICENSE, and is        |
// | available through the world-wide-web at the following url:           |
// | http://www.php.net/license/3_0.txt.                                  |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | license@php.net so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Original Author <author@example.com>                        |
// |          Your Name <you@example.com>                                 |
// +----------------------------------------------------------------------+
//
// $Id:$

class pdomysql {
    public  $dbtype = 'mysql';
    public  $dbhost = '127.0.0.1';
    public  $dbport = '3306';
    public  $dbname = 'test';
    public  $dbuser = 'root';
    public  $dbpass = '';
    public  $charset = 'utf-8';
    public  $stmt = null;
    public  $DB = null;
    public  $connect = true; // 是否長连接
    public  $debug = true;
    private  $parms = array();
    private $sql = array(
        "db" => "",
        "from" => "",
        "where" => "",
        "order" => "",
        "limit" => ""
    );
    /**
     * 构造函数
     */
    public function __construct() {
       
        $this->connect();
        $this->DB->setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, true);
        $this->DB->setAttribute(PDO::ATTR_EMULATE_PREPARES, true);
        $this->execute('SET NAMES ' . $this->charset);
    }
    /**
     * 析构函数
     */
    public function __destruct() {
        $this->close();
    }
    /**
     * *******************基本方法开始********************
     */
    /**
     * 作用:连結数据库
     */
    public function connect() {
        try {
            $this->DB = new PDO($this->dbtype . ':host=' . $this->dbhost . ';port=' . $this->dbport . ';dbname=' . $this->dbname, $this->dbuser, $this->dbpass, array(
                PDO::ATTR_PERSISTENT => $this->connect
            ));
        }
        catch(PDOException $e) {
            die("Connect Error Infomation:" . $e->getMessage());
        }
    }
    /**
     * 关闭数据连接
     */
    public function close() {
        $this->DB = null;
    }
    /**
     * 對字串進行转義
     */
    public function quote($str) {
        return $this->DB->quote($str);
    }
    /**
     * 作用:获取数据表里的欄位
     * 返回:表字段结构
     * 类型:数组
     */
    public function getFields($table) {
        $this->stmt = $this->DB->query("DESCRIBE $table");
        $result = $this->stmt->fetchAll(PDO::FETCH_ASSOC);
        $this->stmt = null;
        return $result;
    }
    /**
     * 作用:获得最后INSERT的主鍵ID
     * 返回:最后INSERT的主鍵ID
     * 类型:数字
     */
    public function getLastId() {
        return $this->DB->lastInsertId();
    }
    /**
     * 作用:執行INSERT\UPDATE\DELETE
     * 返回:执行語句影响行数
     * 类型:数字
     */
    public function execute($sql) {
        $this->getPDOError($sql);
        return $this->DB->exec($sql);
    }
    /**
     * 获取要操作的数据
     * 返回:合併后的SQL語句
     * 类型:字串
     */
    private function getCode($table, $args) {
        $code = '';
        if (is_array($args)) {
            foreach ($args as $k => $v) {
                if ($v == '') {
                    continue;
                }
                $code.= "`$k`='$v',";
            }
        }
        $code = substr($code, 0, -1);
        return $code;
    }
    public function optimizeTable($table) {
        $sql = "OPTIMIZE TABLE $table";
        $this->execute($sql);
    }
    /**
     * 执行具体SQL操作
     * 返回:运行結果
     * 类型:数组
     */
    private function _fetch($sql, $type) {
        $result = array();
        $this->stmt = $this->DB->query($sql);
        $this->getPDOError($sql);
        $this->stmt->setFetchMode(PDO::FETCH_ASSOC);
        switch ($type) {
            case '0':
                $result = $this->stmt->fetch();
                break;

            case '1':
                $result = $this->stmt->fetchAll();
                break;

            case '2':
                $result = $this->stmt->rowCount();
                break;
        }
        $this->stmt = null;
        return $result;
    }
    /**
     * *******************基本方法結束********************
     */
    /**
     * *******************Sql操作方法开始********************
     */
    /**
     * 作用:插入数据
     * 返回:表內記录
     * 类型:数组
     * 參数:$db->insert('$table',array('title'=>'Zxsv'))
     */
    public function add($table, $args) {
        $sql = "INSERT INTO `$table` SET ";
        $code = $this->getCode($table, $args);
        $sql.= $code;
        return $this->execute($sql);
    }
    /**
     * 修改数据
     * 返回:記录数
     * 类型:数字
     * 參数:$db->up($table,array('title'=>'Zxsv'),array('id'=>'1'),$where
     * ='id=3');
     */
    public function up($table, $args, $where) {
        $code = $this->getCode($table, $args);
        $sql = "UPDATE `$table` SET ";
        $sql.= $code;
        $sql.= " Where $where";
        return $this->execute($sql);
    }
    /**
     * 作用:刪除数据
     * 返回:表內記录
     * 类型:数组
     * 參数:$db->del($table,$condition = null,$where ='id=3')
     */
    public function del($table, $where) {
        $sql = "DELETE FROM `$table` Where $where";
        return $this->execute($sql);
    }
    /**
     * 作用:获取單行数据
     * 返回:表內第一条記录
     * 类型:数组
     * 參数:$db->fetOne($table,$condition = null,$field = '*',$where ='')
     */
    public function fetOne($table, $field = '*', $where = false) {
        $sql = "SELECT {$field} FROM `{$table}`";
        $sql.= ($where) ? " WHERE $where" : '';
        return $this->_fetch($sql, $type = '0');
    }
    /**
     * 作用:获取所有数据
     * 返回:表內記录
     * 类型:二維数组
     * 參数:$db->fetAll('$table',$condition = '',$field = '*',$orderby = '',$limit
     * = '',$where='')
     */
    public function fetAll($table, $field = '*', $orderby = false, $where = false) {
        $sql = "SELECT {$field} FROM `{$table}`";
        $sql.= ($where) ? " WHERE $where" : '';
        $sql.= ($orderby) ? " ORDER BY $orderby" : '';
        return $this->_fetch($sql, $type = '1');
    }
    /**
     * 作用:获取單行数据
     * 返回:表內第一条記录
     * 类型:数组
     * 參数:select * from table where id='1'
     */
    public function getOne($sql) {
        return $this->_fetch($sql, $type = '0');
    }
    /**
     * 作用:获取所有数据
     * 返回:表內記录
     * 类型:二維数组
     * 參数:select * from table
     */
    public function getAll($sql) {
        return $this->_fetch($sql, $type = '1');
    }
    /**
     * 作用:获取首行首列数据
     * 返回:首行首列欄位值
     * 类型:值
     * 參数:select `a` from table where id='1'
     */
    public function scalar($sql, $fieldname) {
        $row = $this->_fetch($sql, $type = '0');
        return $row[$fieldname];
    }
    /**
     * 获取記录总数
     * 返回:記录数
     * 类型:数字
     * 參数:$db->fetRow('$table',$condition = '',$where ='');
     */
    public function fetRowCount($table, $field = '*', $where = false) {
        $sql = "SELECT COUNT({$field}) AS num FROM $table";
        $sql.= ($where) ? " WHERE $where" : '';
        return $this->_fetch($sql, $type = '0');
    }
    /**
     * 获取記录总数
     * 返回:記录数
     * 类型:数字
     * 參数:select count(*) from table
     */
    public function getRowCount($sql) {
        return $this->_fetch($sql, $type = '2');
    }
    //链式操作开始
    public function from($tableName) {
        $this->sql["from"] = "FROM " . $tableName;
        return $this;
    }
    public function db($tableName) {
        $this->sql["db"] = $tableName;
        return $this;
    }
    public function where($_where = '1=1') {
        $this->sql["where"] = "WHERE " . $_where;
        return $this;
    }
    public function order($_order = 'id DESC') {
        $this->sql["order"] = "ORDER BY " . $_order;
        return $this;
    }
    public function limit($_limitstart="30",$_limitend = '0') {
        if ($_limitend=="0"){
            $this->sql["limit"] = "LIMIT 0," . $_limitstart;
        }else{
            $this->sql["limit"] = "LIMIT $_limitstart," . $_limitend;
        }
        
        return $this;
    }
    /**
     * 获取所有記录
     * 返回:所有記录
     * 类型:array
     * 參数: $pdomysql->from('dbname')->limit(30)->where('1=1')->select();
     */
    public function select($_select = '*') {
        //return "SELECT " . $_select . " " . (implode(" ", $this->sql));
        $sql="SELECT " . $_select . " " . (implode(" ", $this->sql));
        return $this->_fetch($sql, $type = '1');
    }
    /**
     * 获取一条記录
     * 返回:一条記录
     * 类型:array
     * 參数: $pdomysql->from('dbname')->limit(30)->where('1=1')->find();
     */
    public function find($_find = '*'){
        $this->sql['limit']='limit 1';
        $sql="SELECT " . $_find . " " . (implode(" ", $this->sql));
        return $this->_fetch($sql, $type = '0');
    }
    /**
     * 插入一条数据
     * 返回:执行结果
     * 类型:bool
     * 參数: $pdomysql->db('dbname')->insert(array('col1'="sadsd"));
     */
    public function insert($_insert=array()){
        $table=$this->sql['db'];
        $sql = "INSERT INTO `$table` SET ";
        $code = $this->getCode($table, $args);
        $sql.= $code;
        return $this->execute($sql);
    }
    /**
     * 删除
     * 返回:删除结果
     * 类型:bool
     * 參数: $pdomysql->from('dbname')->where('1=1')->delete();
     */
    public function delete(){
        $sql="DELETE  " . (implode(" ", $this->sql));
        return $this->execute($sql);
    }
    public function update(){
        
    }
    //链式操作end
    /**
     * *******************Sql操作方法結束********************
     */
    /**
     * *******************错误处理开始********************
     */
    /**
     * 設置是否为调试模式
     */
    public function setDebugMode($mode = true) {
        return ($mode == true) ? $this->debug = true : $this->debug = false;
    }
    /**
     * 捕获PDO错误信息
     * 返回:出错信息
     * 类型:字串
     */
    private function getPDOError($sql) {
        $this->debug ? $this->errorfile($sql) : '';
        if ($this->DB->errorCode() != '00000') {
            $info = ($this->stmt) ? $this->stmt->errorInfo() : $this->DB->errorInfo();
            echo ($this->sqlError('mySQL Query Error', $info[2], $sql));
            exit();
        }
    }
    private function getSTMTError($sql) {
        $this->debug ? $this->errorfile($sql) : '';
        if ($this->stmt->errorCode() != '00000') {
            $info = ($this->stmt) ? $this->stmt->errorInfo() : $this->DB->errorInfo();
            echo ($this->sqlError('mySQL Query Error', $info[2], $sql));
            exit();
        }
    }
    /**
     * 寫入错误日志
     */
    private function errorfile($sql) {
        echo $sql . '<br />';
        $errorfile = __DIR__ . '/dberrorlog.php';
        $sql = str_replace(array(
            "\n",
            "\r",
            "\t",
            "  ",
            "  ",
            "  "
        ) , array(
            " ",
            " ",
            " ",
            " ",
            " ",
            " "
        ) , $sql);
        if (!file_exists($errorfile)) {
            $fp = file_put_contents($errorfile, "<?PHP exit('Access Denied'); ?>\n" . $sql);
        } else {
            $fp = file_put_contents($errorfile, "\n" . $sql, FILE_APPEND);
        }
    }
    /**
     * 作用:运行错误信息
     * 返回:运行错误信息和SQL語句
     * 类型:字符
     */
    private function sqlError($message = '', $info = '', $sql = '') {
        $html = '';
        if ($message) {
            $html.= $message;
        }
        if ($info) {
            $html.= 'SQLID: ' . $info;
        }
        if ($sql) {
            $html.= 'ErrorSQL: ' . $sql;
        }
        throw new Exception($html);
    }
    /**
     * *******************错误处理結束********************
     */
}