php mysql數據庫連接類

提供一款簡單實現的連接類是利用php 構造函數自動創建連接與刪除操作，有需要的朋友可以參考。  代碼如下 復制代碼

class mysql {
    private $db_host; //數據庫主機
    private $db_user; //數據庫用戶名
    private $db_pwd; //數據庫用戶名密碼
    private $db_database; //數據庫名
    private $conn; //數據庫連接標識;
    private $result; //執行query命令的結果資源標識
    private $sql; //sql執行語句
    private $row; //返回的條目數
    private $coding; //數據庫編碼，GBK,UTF8,gb2312
    private $bulletin = true; //是否開啟錯誤記錄
    private $show_error = true; //測試階段，顯示所有錯誤,具有安全隱患,默認關閉
    private $is_error = false; //發現錯誤是否立即終止,默認true,建議不啟用，因為當有問題時用戶什麼也看不到是很苦惱的

    /*構造函數*/
    public function __construct($db_host, $db_user, $db_pwd, $db_database, $conn, $coding) {
        $this->db_host = $db_host;
        $this->db_user = $db_user;
        $this->db_pwd = $db_pwd;
        $this->db_database = $db_database;
        $this->conn = $conn;
        $this->coding = $coding;
        $this->connect();
    }

    /*數據庫連接*/
    public function connect() {
        if ($this->conn == "pconn") {
            //永久鏈接
            $this->conn = mysql_pconnect($this->db_host, $this->db_user, $this->db_pwd);
        } else {
            //即使鏈接
            $this->conn = mysql_connect($this->db_host, $this->db_user, $this->db_pwd);
        }

        if (!mysql_select_db($this->db_database, $this->conn)) {
            if ($this->show_error) {
                $this->show_error("數據庫不可用：", $this->db_database);
            }
        }
        mysql_query("SET NAMES $this->coding");
    }

    /*數據庫執行語句，可執行查詢添加修改刪除等任何sql語句*/
    public function query($sql) {
        if ($sql == "") {
            $this->show_error("SQL語句錯誤：", "SQL查詢語句為空");
        }
        $this->sql = $sql;

        $result = mysql_query($this->sql, $this->conn);

        if (!$result) {
            //調試中使用，sql語句出錯時會自動打印出來
            if ($this->show_error) {
                $this->show_error("錯誤SQL語句：", $this->sql);
            }
        } else {
            $this->result = $result;
        }
        return $this->result;
    }

    /*創建添加新的數據庫*/
    public function create_database($database_name) {
        $database = $database_name;
        $sqlDatabase = 'create database ' . $database;
        $this->query($sqlDatabase);
    }