php连接mysql类(mysql.class.php)

<?php

define("MYSQL_SQL_GETDATA", 1);
define("MYSQL_SQL_EXECUTE", 2);

class mysql_db{

var $_server; //数据库服务器地址
var $_user; //数据库连接帐号
var $_password; //数据库连接密码
var $_dbname; //数据库名称
var $_persistency=false; //是否使用持久连接
var $_isConnect = false; //是否已经建立数据库连接
var $_charset="utf8"; //数据库连接字符集

var $_isDebug = false; //是否Debug模式

var $_sql=array(); //执行sql语句数组

var $_db_connect_id; //数据库连接对象标识
var $_result; //执行查询返回的值

var $_record;
var $_rowset;
var $_errno = 0;
var $_error = "connection error";
var $_checkDB = false;

function mysql_db($dbserver, $dbuser, $dbpassword,$database,$persistency = false,$autoConnect=false,$checkdb = false)
{
$this->_server = $dbserver;
$this->_user = $dbuser;
$this->_password = $dbpassword;
$this->_dbname = $database;
$this->_persistency = $persistency;
$this->_autoConnect = $autoConnect;
$this->_checkDB = $checkdb;

if($autoConnect){
$this->connection();
}
}

function connection($newLink = false)
{
if (!$newLink){
if($this->_isConnect && isset($this->_db_connect_id)){
@mysql_close($this->_db_connect_id);
}
}
$this->_db_connect_id = ($this->persistency) ? @mysql_pconnect($this->_server, $this->_user, $this->_password):@mysql_connect($this->_server, $this->_user, $this->_password,$newLink);

if ($this->_db_connect_id)
{
if ($this->version() > '4.1')
{
if ($this->_charset != "")
{
@mysql_query("SET NAMES '".str_replace('-', '', $this->_charset)."'", $this->_db_connect_id);
}
}

if ($this->version() > '5.0')
{
@mysql_query("SET sql_mode=''", $this->_db_connect_id);
}

//检测指定数据库是否连接成功
if ($this->_checkDB){
$dbname = mysql_query('SELECT database()',$this->_db_connect_id);
$dbname = mysql_fetch_array($dbname,MYSQL_NUM);
$dbname = trim($dbname[0]);
}else{
$dbname = '';
}
if ($dbname==$this->_dbname || $dbname==''){
if (!@mysql_select_db($this->_dbname, $this->_db_connect_id))
{
@mysql_close($this->_db_connect_id);
$this->_halt("cannot use database " . $this->_dbname);
}
}else{
if ($this->_checkDB && !$newLink){
$this->connection(true);
}
}
return true;
}
else
{
$this->_halt('connect failed.',false);
}
}

function setCharset($charset){
//$charset = str_replace('-', '', $charset);
$this->_charset = $charset;
}

function setDebug($isDebug=true){
$this->_isDebug = $isDebug;
}

function query($sql,$type='')
{
return $this->_runSQL($sql,MYSQL_SQL_GETDATA,$type);
}

function execute($sql)
{
return $this->_runSQL($sql,MYSQL_SQL_EXECUTE,"UNBUFFERED");
}

function _runSQL($sql,$sqlType=MYSQL_SQL_GETDATA,$type = '')
{
if ($type =="UNBUFFERED"){
$this->_result = @mysql_unbuffered_query($sql,$this->_db_connect_id);
}else{
$this->_result = @mysql_query($sql,$this->_db_connect_id);
}

//测试模式下保存执行的sql语句
if($this->_isDebug){
$this->_sql[]=$sql;
}

if ($this->_result)
{
return $sqlType==MYSQL_SQL_GETDATA?$this->getNumRows():$this->getAffectedRows();
}else{
$this->_halt("Invalid SQL: ".$sql);
return false;
}
}

function next($result_type=MYSQL_ASSOC) {
$this->fetchRow($result_type);
return is_array($this->_record);
}

function f($name) {
if(is_array($this->_record)){
return $this->_record[$name];
}else{
return false;
}
}

function fetchRow($result_type=MYSQL_ASSOC)
{
if( $this->_result )
{
$this->_record = @mysql_fetch_array($this->_result,$result_type);
return $this->_record;
}else{
return false;
}
}

function getAll($sql,$primaryKey="",$result_type=MYSQL_ASSOC)
{
if ($this->_runSQL($sql,MYSQL_SQL_GETDATA)>=0){

return $this->fetchAll($primaryKey,$result_type);
}else{
return false;
}
}

function getOne($sql,$result_type=MYSQL_ASSOC)
{
if ($this->_runSQL($sql,MYSQL_SQL_GETDATA)>0){
$arr = $this->fetchAll("",$result_type);
if(is_array($arr)){
return $arr[0];
}
}else{
return false;
}
}

function fetchAll($primaryKey = "",$result_type=MYSQL_ASSOC)
{
if ($this->_result)
{
$i = 0;
$this->_rowset = array();

if ($primaryKey=="")
{
while($this->next($result_type))
{
$this->_rowset[$i] = $this->_record;
$i++;
}
}else{
while($this->next($result_type))
{
$this->_rowset[$this->f($primaryKey)] = $this->_record;
$i++;
}
}

return $this->_rowset;
}else{
//$this->_halt("Invalid Result");
return false;
}
}

function checkExist($sql)
{
return $this->query($sql)>0?true:false;
}

function getValue($sql, $colset = 0)
{
if ($this->query($sql)>0){
$this->next(MYSQL_BOTH);
return $this->f($colset);
}else{
return false;
}
}

function getNumRows()
{
return @mysql_num_rows($this->_result);
}

function getNumFields()
{
return @mysql_num_fields($this->_result);
}

function getFiledName($offset)
{
return @mysql_field_name($this->_result, $offset);
}

function getFiledType($offset)
{
return @mysql_field_type($this->_result, $offset);
}

function getFiledLen($offset)
{
return @mysql_field_len($this->_result, $offset);
}

function getInsertId()
{
return @mysql_insert_id($this->_db_connect_id);
}

function getAffectedRows()
{
return @mysql_affected_rows($this->_db_connect_id);
}

function free_result()
{
$ret = @mysql_free_result($this->_result);
$this->_result = 0;
return $ret;
}

function version() {
return @mysql_get_server_info($this->_db_connect_id);
}

function close() {
return @mysql_close($this->_db_connect_id);
}

function sqlOutput($isOut = true, $all = true){
if($all){
$ret = implode("<br>",$this->_sql);
}else{
$ret = $this->_sql[count($this->_sql)-1];
}
if ($isOut){
echo $ret;
}else{
return $ret;
}
}

function _halt($msg="Session halted.",$getErr=true) {
if($this->_isDebug){
if($getErr){
$this->_errno = @mysql_errno($this->_db_connect_id);
$this->_error = @mysql_error($this->_db_connect_id);
printf("<b>MySQL _error</b>: %s (%s)<br></font>/n",$this->_errno,$this->_error);
}
die($msg);
}else{
die("Session halted.");
}
}
}
?>