php mysql 类

<?php

class mysql {
       
    private $defaultDB = null;
    private $link = null;
    private $sql = null;
	private $host_info = null;
    private $bindValue = null;
    public $num_rows = 0;
    public $affected_rows = 0;
    public $insert_id = 0;
    public $queries = 0;
       
    public function __construct() {
         
        if(func_num_args()) {
            $argv = func_get_arg(0);
            if(!empty($argv) && is_array($argv)) { 
                $this->connect($argv);
                $argv['charset'] = isset($argv['charset']) ? $argv['charset'] : 'utf8';
                $this->setCharset($argv['charset']);
            }
        }
          
    }
       
    public function connect($argv, $charset = null) {
           
        if($this->link) return false;
        $argv = func_get_arg(0);
        $argv['port'] = isset($argv['port']) ? $argv['port'] : 3306;
        $this->link = mysqli_connect( $argv['host'], $argv['user'], $argv['password'], $argv['database'], $argv['port']);
        if(mysqli_connect_errno()) {
			echo mysqli_connect_error(); 
			exit(0);
		}
		
        $this->defaultDB = $argv['database'];
		$this->host_info = (object) $argv;
          
        if($charset) $this->setCharset($charset);
    }
       
    public function selectDB($database){
       
        $int = mysqli_select_db($this->link, $database);
        if($int) $this->defaultDB = $database;
        return $int;
           
    }
       
    public function query($sql) {
       
        $result = mysqli_query($this->link, $sql);
        if(mysqli_errno($this->link)) {
			echo mysqli_error($this->link);
			exit(0);
		}
		
        $this->queries++;
		
        if(preg_match('/^use\s+(\w+)/', $sql, $matches))
		list($range, $this->defaultDB) = $matches;
		
        if(!preg_match('/^select(.+)$/i', $sql)) {
            $this->affected_rows = mysqli_affected_rows($this->link);
        }else{
            $this->num_rows = mysqli_num_rows($result);
        }
           
        if(preg_match('/^insert(.+)$/i', $sql))
		$this->insert_id = mysqli_insert_id($this->link);
           
        return $result;
           
    }
       
    public function find($sql) {
       
        $collection = array();
        $result = $this->query($sql);
        while($rows = mysqli_fetch_assoc($result))
        array_push($collection, $rows);
        mysqli_free_result($result);
        return $collection;
           
    }
       
    public function findOne($sql) {
       
        $result = $this->query($sql);
        $rows = mysqli_fetch_assoc($result);
        mysqli_free_result($result);
        return $rows;
           
    }
       
    public function setCharset($charset) {
       
        return mysqli_set_charset($this->link, $charset);
           
    }
     
    public function prepare($sql) {
     
        $this->sql = $sql;
         
    }
     
    public function bindValue($search, $value) {
         
        $this->bindValue = array();
        $this->bindValue[$search] = $value;
         
    }
     
    public function execute() {
     
        if(func_num_args()) {
            $argv = func_get_arg(0);
            if(!empty($argv) && is_array($argv)) {
                if(!is_array($this->bindValue)) $this->bindValue = array();
                $this->bindValue = array_merge($this->bindValue, $argv);
            }
        }
         
        if($this->bindValue) {
            foreach($this->bindValue as $search => $value) {
                $this->sql = str_replace($search, $this->escape($value), $this->sql);
            }
            $this->bindValue = null;
        }
         
        $int = $this->query($this->sql);
        //$this->sql = null;
        return (boolean) $int;
    }
     
     
    public function escape($string) {
     
        return mysqli_real_escape_string($this->link, $string);
     
    }
     
    public function close() {
         
        return mysqli_close($this->link);
         
    }
       
    public function ping() {
       
        return mysqli_ping($this->link);
           
    }
       
    public function beginTransaction($boolean) {
       
        return mysqli_autocommit($this->link, $boolean);
           
    }
       
    public function commit() {
       
        return mysqli_commit($this->link);
           
    }
       
    public function rollback() {
       
        return mysqli_rollback($this->link);
           
    }
       
    public function __destruct() {
       
        if($this->link) $this->close();
        unset($this->link, $this->defaultDB, $this->bindValue, $this->sql, $this->result, $this->num_rows, $this->affected_rows, $this->insert_id, $this->host_info);
           
    }
       
}

$argv = array(
'host' => 'localhost',
'user' => 'root',
'password' => '',
'port' => 3306,
'database' => 'test',
'charset'=> 'utf8');


// Using the "mysql::__construct" method to connect MySQL database

$mysql = new mysql($argv);
var_dump($mysql->find('select version()'));
var_dump($mysql->queries);


// Using the "mysql::connect" method to connect MySQL database

$mysql = new mysql();
$mysql->connect($argv);
var_dump($mysql->find('select version()'));
var_dump($mysql->queries);


$mysql = new mysql();
$mysql->connect($argv);
$mysql->setCharset($argv['charset']);
var_dump($mysql->find('select version()'));
var_dump($mysql->queries);