<?phpclass 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();        }    } }?>