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Mysql 數(shù)據(jù)庫訪問類

更新時間：2009年02月15日 18:27:37 作者：

Mysql數(shù)據(jù)庫訪問類實現(xiàn)代碼，對于想學(xué)習(xí)mysql操作類的朋友值得一看

/**
* @Purpose: Mysql數(shù)據(jù)庫訪問類
* @Package:
* @Author: lisen@sellingclub.cn
* @Modifications:
* @See:
* @Time: 2008.10.10
*/
class DB_MYSQL
{
//============================================================
private $Host = 'localhost';
private $Database = 'db_name';
private $User = 'user';
private $Password = 'password';
//============================================================
private $Link_Id = 0; //數(shù)據(jù)庫連接
private $Query_Id = 0; //查詢結(jié)果
private $Row_Result = array(); //結(jié)果集組成的數(shù)組
private $Field_Result = array(); //結(jié)果集字段組成的數(shù)組
private $Affected_Rows; //影響的行數(shù)
private $Rows; //結(jié)果集中記錄的行數(shù)
private $Fields; //結(jié)果集中字段數(shù)
private $Row_Postion = 0; //記錄指針位置索引
public $Insert_Id = 0;
//************************************************************
/**** 構(gòu)造函數(shù) ****/
function __construct()
{
$this->connect();
}
/**** 析構(gòu)函數(shù) ****/
function __destruct()
{
@mysql_free_result($this->Query_Id);
mysql_close($this->Link_Id);
}
/**** 連接服務(wù)器,選擇數(shù)據(jù)庫 ****/
function connect($Database = '',$Host = '',$User = '',$Password = '')
{
$Database = $Database == '' ? $this->Database : $Database;
$Host = $Host == '' ? $this->Host : $Host;
$User = $User == '' ? $this->User : $User;
$Password = $Password == '' ? $this->Password : $Password;
//-----------------------------------------------------------//
if(0 == $this->Link_Id)
{
$this->Link_Id = @mysql_pconnect($Host,$User,$Password);
if(!$this->Link_Id)
{
$this->halt('連接數(shù)據(jù)庫服務(wù)端失敗!');
}
if(!mysql_select_db($this->Database,$this->Link_Id))
{
$this->halt('不能打開指定的數(shù)據(jù)庫：'.$this->Database);
}
}
return $this->Link_Id;
}
/**** 釋放內(nèi)存 ****/
function free()
{
if(@mysql_free_result($this->Query_Id))
{
unset($this->Row_Result);
}
$this->Query_Id = 0;
}
/**** 執(zhí)行查詢 ****/
function query($Query_String)
{
//釋放上次查詢內(nèi)存
if($this->Query_Id)
{
$this->free();
}
if(0 == $this->Link_Id)
{
$this->connect();
}
//設(shè)置中文字符集
@mysql_query('set names gb2312');
$this->Query_Id = mysql_query($Query_String,$this->Link_Id);
$this->Insert_Id = mysql_insert_id();
if(!$this->Query_Id)
{
$this->halt('SQL查詢語句出錯：'.$Query_String);
}
@mysql_query('set names gb2312');
return $this->Query_Id;
}
/**** 將結(jié)果集指針指向指定行 ****/
function seek($pos)
{
if(@mysql_data_seek($this->Query_Id,$pos))
{
$this->Row_Position = $pos;
return true;
}
else
{
$this->halt('定位結(jié)果集發(fā)生錯誤!');
return false;
}
}
/**** 返回結(jié)果集組成的數(shù)組 ****/
function get_rows_array()
{
$this->get_rows();
for($i = 0; $i < $this->Rows; $i++)
{
if(!mysql_data_seek($this->Query_Id,$i))
{
$this->halt('mysql_data_seek 查詢出錯!');
}
$this->Row_Result[$i] = mysql_fetch_array($this->Query_Id);
}
return $this->Row_Result;
}
/**** 返回結(jié)果集字段組成的數(shù)組 ****/
function get_fields_array()
{
$this->get_fields();
for($i = 0; $i < $this->Fields; $i++)
{
$obj = mysql_fetch_field($this->Query_Id,$i);
$this->Field_Result[$i] = $obj->name;
}
return $this->Field_Result;
}
/**** 返回影響記錄數(shù) ****/
function get_affected_rows()
{
$this->Affected_Rows = mysql_affected_rows($this->Link_Id);
return $this->Affected_Rows;
}
/**** 返回結(jié)果集中的記錄數(shù) ****/
function get_rows()
{
$this->Rows = mysql_num_rows($this->Query_Id);
return $this->Rows;
}
/**** 返回結(jié)果集中的字段個數(shù) ****/
function get_fields()
{
$this->Fields = mysql_num_fields($this->Query_Id);
return $this->Fields;
}
/**** 執(zhí)行sql語句并返回由查詢結(jié)果中第一行記錄組成的數(shù)組 ****/
function fetch_one_array($sql)
{ @mysql_query('set names gb2312');
$this->query($sql);
return mysql_fetch_array($this->Query_Id);
}
/**** 打印錯誤信息 ****/
function halt($msg)
{
$this->Error = mysql_error();
printf(" 數(shù)據(jù)庫發(fā)生錯誤： %s \n",$msg);
printf("MySQL 返回錯誤信息： %s \n",$this->Error);
printf("錯誤頁面：%s \n",$_SERVER['PHP_SELF']);
printf(" 請將錯誤信息提交到系統(tǒng)管理員或網(wǎng)站程序員處理! \n");
die('腳本終止');
}
}

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