php操作mysql的类

[PHP]代码

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 "";
        $i = 1;
        while ($row = $this->fetch_array($rs)) {
            echo "$i $row[Database]";
            echo "";
            $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             $rs[] = mysql_db_name($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 "";
        $i = 1;
        while ($row = $this->fetch_array($rs)) {
            $columnName = "Tables_in_" . $database_name;
            echo "$i $row[$columnName]";
            echo "";
            $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 "" . $message . "";
            echo "";
        } else {
            echo "";            echo "错误信息提示:
";
            echo "";            echo "";            echo "错误号：12142";
            echo "

";

echo "

" . $sql . "

";

$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 "
";

if ($this->is_error) {

exit;

}

}

echo "

";

echo "

";

echo "
";

}

//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 "
";

echo "字段数：" . $total = mysql_num_fields($this->result);

echo "

";

for ($i = 0; $i print_r(mysql_fetch_field($this->result, $i));

}

echo "";

echo "
";

}

//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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php, mysql