分享一个mysql类~

 
<?php
/**
* 操作mysql
的基础类，其它与mysql有关的类都继承于此基类
*
* 此class中的$table都是已经包含表前缀的完整表名
*
* ver 20090717
* 使用范例
* $db = new DB('localhost','root','password','database','utf8');
* $db->debug = true;
* $db->primaryKeys = array (
* 'table_1' => 'id',
* 'table_2' => 'id2'
* );
* $db->find('table_1', 1);
* $db->findAll('table_2', '*', 'catid=1', 'id desc');
* ……
*/
class DBBase extends Base {
public $debug; //调试
public $primaryKeys = array(); //设定各表的主键，在创建类实例后必须设定表主键 $db->primaryKeys(array('表1'=>'主键字段
1','表2'=>'主键字段2'))
public $queryCount = 0;
public $haltOnError = true;
public $displayError=true;
public $queryID;
public $connected = false;
public $tableFields = array();
public $dbhost;
public $dbuser;
public $dbpwd;
public $dbname;
public $dbcharset;
public $pconnect = false;
public function __construct($host, $user, $pwd, $database = null, $charset = null, $pconnect = null) {
$this->dbhost = $host;
$this->dbuser = $user;
$this->dbpwd = $pwd;
$this->dbname = $database;
$this->dbcharset = $charset;
$this->pconnect = $pconnect;
}
public public function connect()
{
if ($this->pconnect) {
@mysql_pconnect($this->dbhost, $this->dbuser, $this->dbpwd) || die('<b>MySQL
ERROR:</b> ' . mysql_error());
} else {
@mysql_connect($this->dbhost, $this->dbuser, $this->dbpwd) || die('<b>MySQL ERROR:</b> ' . mysql_error());
}
if ($this->dbname != null) {
$this->selectdb($this->dbname);
}
$this->connected = true;
}
public function selectdb($dbname) {
$this->dbname = $dbname;
mysql_select_db($this->dbname) || die('<b>MySQL ERROR(mysql_selectt_db):</b> ' . mysql_error());
$serverVersion=$this->serverVersion();
if ($this->dbcharset && $this->serverVersion()>='4.1') {
mysql_query("SET NAMES " .