PHP implements basic database connection, execution of SQL statements and error prompts

This article mainly introduces PHP to implement basic database connections, execute SQL statements and error prompts. Interested friends can refer to it. I hope it will be helpful to everyone.

The example of this article describes the relatively complete database operation class implemented by PHP, as follows:

<?php
 class database
 {
  private $hostname;
  private $user;
  private $pass;
  private $dbname;
  private $linkflag;
  private $charset;
  function __construct()
  {
   $this->hostname="localhost";
   $this->user="root";
   $this->pass="111";
   $this->dbname="";
   $this->charset="utf8"; //gb2312 GBK utf8
   $this->linkflag=mysql_connect($this->hostname,$this->user,$this->pass);
   mysql_select_db($this->dbname,$this->linkflag) or die($this->error());
   mysql_query("set names ".$this->charset);
  }
  function __set($property_name,$value)
  {
   return $this->$property_name=$value;
  }
  function __get($property_name)
  {
   if(isset($this->$property_name))
   {
    return $this->$property_name;
   }
   else return null;
  }
  function __call($function_name, $args)
  {
    echo "<br><font color=#ff0000>你所调用的方法 $function_name 不存在</font><br>\n";
  }
  function query($sql)
  {
   $res=mysql_query($sql) or die($this->error());
   return $res;
  }
  function fetch_array($res)
  {
   return mysql_fetch_array($res);
  }
  function fetch_object($res)
  {
   return mysql_fetch_object($res);
  }
  function fetch_obj_arr($sql)
  {
   $obj_arr=array();
   $res=$this->query($sql);
   while($row=mysql_fetch_object($res))
   {
    $obj_arr[]=$row;
   }
   return $obj_arr;
  }
  function error()
  {
   if($this->linkflag)
   {
    return mysql_error($this->linkflag);
   }
   else return mysql_error();
  }
  function errno()
  {
   if($this->linkflag)
   {
    return mysql_errno($this->linkflag);
   }
   else return mysql_errno();
  }
  function affected_rows()
  {
   return mysql_affected_rows($this->linkflag);
  }
  function num_rows($sql)
  {
   $res=$this->execute($sql);
   return mysql_num_rows($res);
  }
  function num_fields($res)
  {
   return mysql_num_fields($res);
  }
  function insert_id()
  {
   $previous_id=mysql_insert_id($this->linkflag);
   return $previous_id;
  }
  function result($res,$row,$field=null)
  {
   if($field===null)
   {
    $res=mysql_result($res,$row);
   }
   else $res=mysql_result($res,$row,$field);
   return $res;
  }
  function version()
  {
   return mysql_get_server_info($this->linkflag);
  }
  function data_seek($res,$rowNum)
  {
   return mysql_data_seek($res,$rowNum);
  }
  function __destruct()
  {
   //mysql_close($this->linkflag);
  }
 }
?>

Summary: The above is the entire content of this article, I hope it can be helpful to everyone's learning helped.

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