php mysql 封装类实例代码

废话不多说了，具体代码如下所示：

    <?php
    class mysql {
    private $db_host; //数据库主机
    private $db_user; //数据库用户名
    private $db_pwd; //数据库用户名密码
    private $db_database; //数据库名
    private $conn; //数据库连接标识;
    private $result; //执行query命令的结果资源标识
    private $sql; //sql执行语句
    private $row; //返回的条目数
    private $coding; //数据库编码，GBK,UTF8,gb2312
    private $bulletin = true; //是否开启错误记录
    private $show_error = false; //测试阶段，显示所有错误,具有安全隐患,默认关闭
    private $is_error = false; //发现错误是否立即终止,默认true,建议不启用，因为当有问题时用户什么也看不到是很苦恼的
    /*构造函数*/
    public function __construct($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;
    $this->connect();
    }
    /*数据库连接*/
    public function connect() {
    if ($this->conn == "pconn") {
    //永久链接
    $this->conn = mysql_pconnect($this->db_host, $this->db_user, $this->db_pwd);
    } else {
    //即使链接
    $this->conn = mysql_connect($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("数据库不可用：", $this->db_database);
    }
    }
    mysql_query("SET NAMES $this->coding");
    }
    /*数据库执行语句，可执行查询添加修改删除等任何sql语句*/
    public function query($sql) {
    if ($sql == "") {
    $this->show_error("SQL语句错误：", "SQL查询语句为空");
    }
    $this->sql = $sql;
    $result = mysql_query($this->sql, $this->conn);
    if (!$result) {
    //调试中使用，sql语句出错时会自动打印出来
    if ($this->show_error) {
    $this->show_error("错误SQL语句：", $this->sql);
    }
    } else {
    $this->result = $result;
    }
    return $this->result;
    }
    /*创建添加新的数据库*/
    public function create_database($database_name) {
    $database = $database_name;
    $sqlDatabase = 'create database ' . $database;
    $this->query($sqlDatabase);
    }
    /*查询服务器所有数据库*/
    //将系统数据库与用户数据库分开，更直观的显示？
    public function show_databases() {
    $this->query("show databases");
    echo "现有数据库：" . $amount = $this->db_num_rows($rs);
    echo "<br />";
    $i = 1;
    while ($row = $this->fetch_array($rs)) {
    echo "$i $row[Database]";
    echo "<br />";
    $i++;
    }
    }
    //以数组形式返回主机中所有数据库名
    public function databases() {
    $rsPtr = mysql_list_dbs($this->conn);
    $i = 0;
    $cnt = mysql_num_rows($rsPtr);
    while ($i < $cnt) {
    $rs[] = mysql_db_name($rsPtr, $i);
    $i++;
    }
    return $rs;
    }
    /*查询数据库下所有的表*/
    public function show_tables($database_name) {
    $this->query("show tables");
    echo "现有数据库：" . $amount = $this->db_num_rows($rs);
    echo "<br />";
    $i = 1;
    while ($row = $this->fetch_array($rs)) {
    $columnName = "Tables_in_" . $database_name;
    echo "$i $row[$columnName]";
    echo "<br />";
    $i++;
    }
    }
    /*
    mysql_fetch_row() array $row[0],$row[1],$row[2]
    mysql_fetch_array() array $row[0] 或 $row[id]
    mysql_fetch_assoc() array 用$row->content 字段大小写敏感
    mysql_fetch_object() object 用$row[id],$row[content] 字段大小写敏感
    */
    /*取得结果数据*/
    public function mysql_result_li() {
    return mysql_result($str);
    }
    /*取得记录集,获取数组-索引和关联,使用$row['content'] */
    public function fetch_array($resultt="") {
    if($resultt<>""){
    return mysql_fetch_array($resultt);
    }else{
    return mysql_fetch_array($this->result);
    }
    }
    //获取关联数组,使用$row['字段名']
    public function fetch_assoc() {
    return mysql_fetch_assoc($this->result);
    }
    //获取数字索引数组,使用$row[0],$row[1],$row[2]
    public function fetch_row() {
    return mysql_fetch_row($this->result);
    }
    //获取对象数组,使用$row->content
    public function fetch_Object() {
    return mysql_fetch_object($this->result);
    }
    //简化查询select
    public function findall($table) {
    $this->query("SELECT * FROM $table");
    }
    //简化查询select
    public function select($table, $columnName = "*", $condition = '', $debug = '') {
    $condition = $condition ? ' Where ' . $condition : NULL;
    if ($debug) {
    echo "SELECT $columnName FROM $table $condition";
    } else {
    $this->query("SELECT $columnName FROM $table $condition");
    }
    }
    //简化删除del
    public function delete($table, $condition, $url = '') {
    if ($this->query("DELETE FROM $table WHERE $condition")) {
    if (!empty ($url))
    $this->Get_admin_msg($url, '删除成功！');
    }
    }
    //简化插入insert
    public function insert($table, $columnName, $value, $url = '') {
    if ($this->query("INSERT INTO $table ($columnName) VALUES ($value)")) {
    if (!empty ($url))
    $this->Get_admin_msg($url, '添加成功！');
    }
    }
    //简化修改update
    public function update($table, $mod_content, $condition, $url = '') {
    //echo "UPDATE $table SET $mod_content WHERE $condition"; exit();
    if ($this->query("UPDATE $table SET $mod_content WHERE $condition")) {
    if (!empty ($url))
    $this->Get_admin_msg($url);
    }
    }
    /*取得上一步 INSERT 操作产生的 ID*/
    public function insert_id() {
    return mysql_insert_id();
    }
    //指向确定的一条数据记录
    public function db_data_seek($id) {
    if ($id > 0) {
    $id = $id -1;
    }
    if (!@ mysql_data_seek($this->result, $id)) {
    $this->show_error("SQL语句有误：", "指定的数据为空");
    }
    return $this->result;
    }
    // 根据select查询结果计算结果集条数
    public function db_num_rows() {
    if ($this->result == null) {
    if ($this->show_error) {
    $this->show_error("SQL语句错误", "暂时为空，没有任何内容！");
    }
    } else {
    return mysql_num_rows($this->result);
    }
    }
    // 根据insert,update,delete执行结果取得影响行数
    public function db_affected_rows() {
    return mysql_affected_rows();
    }
    //输出显示sql语句
    public function show_error($message = "", $sql = "") {
    if (!$sql) {
    echo "<font color='red'>" . $message . "</font>";
    echo "<br />";
    } else {
    echo "<fieldset>";
    echo "<legend>错误信息提示:</legend><br />";
    echo "<div style='font-size:14px; clear:both; font-family:Verdana, Arial, Helvetica, sans-serif;'>";
    echo "<div style='height:20px; background:#000000; border:1px #000000 solid'>";
    echo "<font color='white'>错误号：12142</font>";
    echo "</div><br />";
    echo "错误原因：" . mysql_error() . "<br /><br />";
    echo "<div style='height:20px; background:#FF0000; border:1px #FF0000 solid'>";
    echo "<font color='white'>" . $message . "</font>";
    echo "</div>";
    echo "<font color='red'><pre>" . $sql . "</pre></font>";
    $ip = $this->getip();
    if ($this->bulletin) {
    $time = date("Y-m-d H:i:s");
    $message = $message . "\r\n$this->sql" . "\r\n客户IP:$ip" . "\r\n时间 :$time" . "\r\n\r\n";
    $server_date = date("Y-m-d");
    $filename = $server_date . ".txt";
    $file_path = "error/" . $filename;
    $error_content = $message;
    //$error_content="错误的数据库，不可以链接";
    $file = "error"; //设置文件保存目录
    //建立文件夹
    if (!file_exists($file)) {
    if (!mkdir($file, 0777)) {
    //默认的 mode 是 0777，意味着最大可能的访问权
    die("upload files directory does not exist and creation failed");
    }
    }
    //建立txt日期文件
    if (!file_exists($file_path)) {
    //echo "建立日期文件";
    fopen($file_path, "w+");
    //首先要确定文件存在并且可写
    if (is_writable($file_path)) {
    //使用添加模式打开$filename，文件指针将会在文件的开头
    if (!$handle = fopen($file_path, 'a')) {
    echo "不能打开文件 $filename";
    exit;
    }
    //将$somecontent写入到我们打开的文件中。
    if (!fwrite($handle, $error_content)) {
    echo "不能写入到文件 $filename";
    exit;
    }
    //echo "文件 $filename 写入成功";
    echo "――错误记录被保存!";
    //关闭文件
    fclose($handle);
    } else {
    echo "文件 $filename 不可写";
    }
    } else {
    //首先要确定文件存在并且可写
    if (is_writable($file_path)) {
    //使用添加模式打开$filename，文件指针将会在文件的开头
    if (!$handle = fopen($file_path, 'a')) {
    echo "不能打开文件 $filename";
    exit;
    }
    //将$somecontent写入到我们打开的文件中。
    if (!fwrite($handle, $error_content)) {
    echo "不能写入到文件 $filename";
    exit;
    }
    //echo "文件 $filename 写入成功";
    echo "――错误记录被保存!";
    //关闭文件
    fclose($handle);
    } else {
    echo "文件 $filename 不可写";
    }
    }
    }
    echo "<br />";
    if ($this->is_error) {
    exit;
    }
    }
    echo "</div>";
    echo "</fieldset>";
    echo "<br />";
    }
    //释放结果集
    public function free() {
    @ mysql_free_result($this->result);
    }
    //数据库选择
    public function select_db($db_database) {
    return mysql_select_db($db_database);
    }
    //查询字段数量
    public function num_fields($table_name) {
    //return mysql_num_fields($this->result);
    $this->query("select * from $table_name");
    echo "<br />";
    echo "字段数：" . $total = mysql_num_fields($this->result);
    echo "<pre>";
    for ($i = 0; $i < $total; $i++) {
    print_r(mysql_fetch_field($this->result, $i));
    }
    echo "</pre>";
    echo "<br />";
    }
    //取得 MySQL 服务器信息
    public function mysql_server($num = '') {
    switch ($num) {
    case 1 :
    return mysql_get_server_info(); //MySQL 服务器信息
    break;
    case 2 :
    return mysql_get_host_info(); //取得 MySQL 主机信息
    break;
    case 3 :
    return mysql_get_client_info(); //取得 MySQL 客户端信息
    break;
    case 4 :
    return mysql_get_proto_info(); //取得 MySQL 协议信息
    break;
    default :
    return mysql_get_client_info(); //默认取得mysql版本信息
    }
    }
    //析构函数，自动关闭数据库,垃圾回收机制
    public function __destruct() {
    if (!empty ($this->result)) {
    $this->free();
    }
    mysql_close($this->conn);
    } //function __destruct();
    /*获得客户端真实的IP地址*/
    function getip() {
    if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown")) {
    $ip = getenv("HTTP_CLIENT_IP");
    } else
    if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown")) {
    $ip = getenv("HTTP_X_FORWARDED_FOR");
    } else
    if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown")) {
    $ip = getenv("REMOTE_ADDR");
    } else
    if (isset ($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown")) {
    $ip = $_SERVER['REMOTE_ADDR'];
    } else {
    $ip = "unknown";
    }
    return ($ip);
    }
    function inject_check($sql_str) { //防止注入
    $check = eregi('select|insert|update|delete|\'|\/\*|\*|\.\.\/|\.\/|union|into|load_file|outfile', $sql_str);
    if ($check) {
    echo "输入非法注入内容！";
    exit ();
    } else {
    return $sql_str;
    }
    }
    function checkurl() { //检查来路
    if (preg_replace("/https?:\/\/([^\:\/]+).*/i", "\\1", $_SERVER['HTTP_REFERER']) !== preg_replace("/([^\:]+).*/", "\\1", $_SERVER['HTTP_HOST'])) {
    header("Location: http://www.dareng.com");
    exit();
    }
    }
    }
    ?>

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