php- mysql连接类实现

2024-07-24 12:56:36

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/*************************************
mysql连接类实现 -write by 三千
**************************************/
/*
使用方法(可以执行一般mysql命令,insert, delete select update)
在文件前,需要加载方法
require("mysql.class.php")
$db=new dbmysql; 加载类
$db->dbserver="localhost";
$db->dbuser="root";
$db->dbpwd="";
$db->dbdatabase="";
$db->dbconnect();

query($sql,$database);
query_first($sql,$database);
fetch_array($sql,$database);
count_records($table,$index,$where,$database);)//为得到一个表记录的数目，$table为表名，$index为key，$where为条件，$dbbase为数据库，后两个可以不选
*/

class db_mysql
{

  var $usepconnect;
  var $dbsever;
  var $dbdatabase;
  var $dbbase;
  var $dbuser;
  var $dbpwd;
  var $dblink;
  var $query_id;// 执行query命令的指针
  var $num_rows;// 返回的条目数
  var $insert_id;// 传回最后一次使用 insert 指令的 id
  var $affected_rows;// 传回query命令所影响的列数目
                  // insert、update 或 delete 所影响的列 (row) 数目。
                  // delete 如果不带where，那么则返回0
  function dbconnect($dbbase,$usepconnect)
  {
   //global $usepconnect;
   if($usepconnect==1)
    $this->[email protected]_pconnect($this->dbserver,$this->dbuser,$this->dbpwd);//long connect
   else
    $this->[email protected]_connect($this->dbserver,$this->dbuser,$this->dbpwd);//short connect
   //$this->dbhalt($this->dbbase);
   if(!$this->dblink) $this->dbhalt("exsiting error when connecting!");
   if($this->dbbase=="") $this->dbbase=$this->dbdatabase;
   if(dbbase,$this->dblink">[email protected]_select_db($this->dbbase,$this->dblink))
    $this->dbhalt("can't use this database,please check database!");
  } // end func() connect database
  //change database
  function dbchange_db($dbbase){
   $this->dbconnect($dbbase);

  }
  function dbquery($sql){
   //if($dbbase!="") $this->dbchange_db($dbbase);
   $this->query_id=mysql_query($sql);
   //print($query_id);
   if(!$this->query_id) $this->dbhalt("wrong sql sentence!".$sql);
   return $this->query_id;
  }
  function dbquery_first($sql,$dbbase){
   $query_id=dbquery($sql,$dbbase);
   $returnarray=mysql_fetch_array($query_id);
   $this->num_rows=mysql_num_rows($query_id);
   $this->dbfree_result($query_id);
   return $returnarray;
  }
  function dbhalt($errmsg){
   $msg="

database is wrong!

";
   $msg=$errmsg;
   echo"$msg";
   die();
  }
  function dbfetch_array($sql,$dbbase,$type){
   $query_id=$this->dbquery($sql,$dbbase);
   $this->numrows=mysql_num_rows($query_id);
   for($i=0;$i<$this->numrows;$i++){
    if($type==0)
     $array[$i]=mysql_fetch_array($query_id);
    else
     $array[$i]=mysql_fetch_array($query_id);
   }
   $this->dbfree_result($query_id);
   return $array;
  }
  function dbdelete($sql,$dbdase){
   $query_id=$this->dbquery($sql,$dbbase);
   $this->affected_rows=mysql_affected_rows($this->dblink);
   $this->free_reuslt($query_id);
  }
  function dbinsert($sql,$dbbase){
   $query_id=$this->dbquery($sql,$dbbase);
   $this->insert_id=mysql_insert_id($this->dblink);
   $this->affected_rows=mysql_affected_rows($this->dblink);
   $this->free_reuslt($query_id);
  }
  function dbupdate($sql,$dbbase){
   $query_id=$this->dbquery($sql,$dbbase);
   $this->insert_id=mysql_insert_id($this->dblink);
   $this->affected_rows=mysql_affected_rows($this->dblink);
   $this->free_reuslt($query_id);
  }
  function dbcount_records($table,$index="id",$where="",$dbbase){
   if($dbbase!="")$this->dbchangedb($dbbase);
   $[email protected]_query("select count(".$index.") as 'num' form".$table."where".$where,$this->dblink);
   if(!$result) $this->dbhalt("wrong sql sentence".$sql);
    $[email protected]_result($result,0,"num");
   return $num;
  }
  function dbgetnum($result){
   $[email protected]_numrows($result);
   return $num;
  }
  function dbfree_result($result_id){
   @mysql_free_result($query_id);
  }
  function dbclose(){
   mysql_close($this->dblink);
  }
} // end class
$db=new db_mysql;
$db->dbserver="localhost";
$db->dbuser="root";
$db->dbpwd="";
$db->dbbase="test";