php mysql完整数据库连接类

php教程 mysql教程完整数据库教程连接类
 */
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 "错误原因：" . mysql_error() . "

";
   echo "

";
   echo "" . $message . "";
   echo "

";
   echo "

" . $sql . "

";
   $ip = $this->getip();
   if ($this->bulletin) {
    $time = date("y-m-d h:i:s");
    $message = $message . "rn$this->sql" . "rn客户ip:$ip" . "rn时间 :$time" . "rnrn";

    $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 "

";<br>
  for ($i = 0; $i 
   print_r(mysql_fetch_field($this->result, $i));<br>
  }<br>
  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教程?://([^:/]+).*/i", "1", $_server['http_referer']) !== preg_replace("/([^:]+).*/", "1", $_server['http_host'])) {
   header("location: http://www.zhutiai.com");
   exit();
  }
 }

}