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php的MySQL连接类你知道多少?

Jun 13, 2016 am 11:49 AM
php

本篇文章是对php的MySQL连接类进行了详细的分析介绍,需要的朋友参考下

无意间在电脑里发现还有这么个Mysql的连接类,也不记得哪里收藏的了,贴上来吧。

后面几个show_databases和show_tables....等方法都用了一堆echo,好像一直不喜欢在类的方法里直接用输出语句,不过这也只是列举数据库和表名,构造函数的参数也可以给个默认值吧。

代码如下:

<?php
/*
* filename:mysql数据库连接类
*/
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 = true;  //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{
   //即时链接
   $this->conn=mysql_connect($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;
  $sqlDatabase = &#39;create database &#39;.$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(){
  $rs=$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 $rs;
 }
 /*查询数据库下所有的表*/
 function show_tables($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[&#39;content&#39;] */
 public function fetch_array()
 {
  return mysql_fetch_array($this->result);
 }
 //获取关联数组,使用$row[&#39;字段名&#39;]
 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)
 {
  if($columnName==""){
   $columnName="*";
  }
  $this->query("SELECT $columnName FROM $table $condition");
 }
 //简化删除del
 public function delete($table,$condition){
  $this->query("DELETE FROM $table WHERE $condition");
 }
 //简化插入insert
 public function insert($table,$columnName,$value){
  $this->query("INSERT INTO $table ($columnName) VALUES ($value)");
 }
 //简化修改update
 public function update($table,$mod_content,$condition){
  $this->query("UPDATE $table SET $mod_content WHERE $condition");
 }
 /*取得上一步 INSERT 操作产生的 ID*/
 public function insert_id(){
  return mysql_insert_id();
    }
 //指向确定的一条数据记录
 public function db_data_seek($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(!$sql){
   echo "<font color=&#39;red&#39;>".$message."</font>";
   echo "<br />";
  }else{
   echo "<fieldset>";
   echo "<legend>错误信息提示:</legend><br />";
   echo "<p style="font-size:14px; clear:both; font-family:Verdana, Arial, Helvetica, sans-serif;" mce_style="font-size:14px; clear:both; font-family:Verdana, Arial, Helvetica, sans-serif;">";
   echo "<p style=&#39;height:20px; background:#000000; border:1px #000000 solid&#39;>";
   echo "<font color=&#39;white&#39;>错误号:12142</font>";
   echo "</p><br />";
   echo "错误原因:".mysql_error()."<br /><br />";
   echo "<p style=&#39;height:20px; background:#FF0000; border:1px #FF0000 solid&#39;>";
   echo "<font color=&#39;white&#39;>".$message."</font>";
   echo "</p>";
   echo "<font color=&#39;red&#39;><pre class="brush:php;toolbar:false">".$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; $i<$total; $i++){
   print_r(mysql_fetch_field($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); } } ?>
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