discuz db 類

<!-- lang: php -->
<?php
/**
 * by mckee & www.phpddt.com
 * modified by discuz DB
 */

class Mysql{

private $host; //主機名
private $username; //用戶名
private $password; //密碼
private $dbname; //數據庫名
private $conn; //連接資源
private $pconnect; //是否持久鏈接
private $charset; //數據庫編碼
public $histories; //保存執行的sql語句
public $querynum = 0;  //查詢的次數

//構造函數,初始化時鏈接數據庫
public function __construct($host, $username, $password, $dbname, $charset, $pconnect = 0){
	$this->host = $host;
	$this->username = $username;
	$this->password = $password;
	$this->dbname = $dbname;
	$this->charset = $charset;
	if($pconnect){
		if(!$this->conn = mysql_pconnect($this->host,$this->username,$this->password)){
			$this->halt('Cannot connect to mysql');
		}
	}else{
		if(!$this->conn = mysql_connect($this->host,$this->username,$this->password)){
			$this->halt('Cannot connect to mysql');
		}
	}
	mysql_select_db($this->dbname);
	mysql_query("SET NAMES {$this->charset}");
}
//使用mysql_unbuffered_query不會使用緩衝區，可是它也有缺點，好比你不能使用mysql_num_rows來取得它結果的數量。
function query($sql, $type = '', $cachetime = FALSE) {
	$func = $type == 'UNBUFFERED' && @function_exists('mysql_unbuffered_query') ? 'mysql_unbuffered_query' : 'mysql_query';
	if(!($query = $func($sql, $this->conn)) && $type != 'SILENT') {
		$this->halt('MySQL Query Error', $sql);
	}
	$this->querynum++;
	$this->histories[] = $sql;
	return $query;
}

  //默認返回關聯數組 public function fetch_array($query, $result_type = MYSQL_ASSOC) { return mysql_fetch_array($query, $result_type); }   //返回第一行第一列 function result_first($sql) { $query = $this->query($sql); return $this->result($query, 0); }   //返回第一行數據 function fetch_first($sql) { $query = $this->query($sql); return $this->fetch_array($query); }   function fetch_all($sql, $id = '') { $arr = array(); $query = $this->query($sql); while($data = $this->fetch_array($query)) { $id ? $arr[$data[$id]] = $data : $arr[] = $data; } return $arr; } function affected_rows() { return mysql_affected_rows($this->conn); }   function error() { return (($this->conn) ? mysql_error($this->conn) : mysql_error()); }   function errno() { return intval(($this->conn) ? mysql_errno($this->conn) : mysql_errno()); }   function result($query, $row) { $query = @mysql_result($query, $row); return $query; }   function num_rows($query) { $query = mysql_num_rows($query); return $query; } //返回字段的數目 function num_fields($query) { return mysql_num_fields($query); }   function free_result($query) { return mysql_free_result($query); } //若是 AUTO_INCREMENT 的列的類型是 BIGINT，則 mysql_insert_id() 返回的值將不正確,可是能夠用LAST_INSERT_ID() 來替代 function insert_id() { return ($id = mysql_insert_id($this->conn)) >= 0 ? $id : $this->result($this->query("SELECT last_insert_id()"), 0); }

function fetch_row($query) {
	$query = mysql_fetch_row($query);
	return $query;
}
//取得列信息
function fetch_fields($query) {
	return mysql_fetch_field($query);
}

  function version() { return mysql_get_server_info($this->conn); }   function close() { return mysql_close($this->conn); } //中斷提示 public function halt($message = '', $sql = ''){ $error = mysql_error(); $errorno = mysql_errno(); $s = ''; if($message) { $s = "<b>Error info:</b> $message<br />"; } if($sql) { $s .= '<b>SQL:</b>'.htmlspecialchars($sql).'<br />'; } $s .= '<b>Error:</b>'.$error.'<br />'; $s .= '<b>Errno:</b>'.$errorno.'<br />'; exit($s); } } ?>