数据库连接类 DB.class.php

<?php
/**
* 数据库操作类
*/
class DB {
private $link_id;
private $handle;    //日志文件句柄
private $is_log;
private $time;

public function __construct() {
header("Content-type: text/html; charset=utf-8");
$this->time = $this->microtime_float();
require_once 'configs/config.db.php';
$this->connect($db_config["hostname"], $db_config["username"], $db_config["password"], $db_config["database"], $db_config["pconnect"]);
$this->is_log = $db_config["log"];
if($this->is_log){
$this->handle = fopen($db_config["logfilepath"] . "dblog.txt", "a+");
}
}

/**
* 连接数据库
*/
public function connect($dbhost, $dbuser, $dbpw, $dbname, $pconnect = 0, $charset ='utf8') {
if($pconnect == 0){
$this->link_id = mysql_connect($dbhost, $dbuser, $dbpw, true);
if(!$this->link_id){
$this->halt("数据库连接失败");
}
}else{
$this->link_id = mysql_pconnect($dbhost, $dbuser, $dbpw);
if(!$this->link_id){
$this->halt("数据库长连接失败");
}
}
if(!mysql_select_db($dbname, $this->link_id)){
$this->halt("数据库选择失败");
}
mysql_query("set names " . $charset);
}

/**
* 查询
* Enter description here ...
* @param unknown_type $sql
*/
public function query($sql){
$this->write_log("查询 " . $sql);
$query = mysql_query($sql, $this->link_id);
if(!$query){
$this->halt("查询失败 " . $sql);
}
return $query;
}

/**
* 获取一条记录（MYSQL_ASSOC，MYSQL_NUM，MYSQL_BOTH）
* Enter description here ...
* @param $sql
*/
public function get_one($sql, $result_type = MYSQL_ASSOC){
$query = $this->query($sql);
$rt = mysql_fetch_array($query, $result_type);
$this->write_log("获取一条记录 " . $sql);
return $rt;
}

/**
* 获取全部记录
* Enter description here ...
* @param unknown_type $sql
* @param unknown_type $result_type
*/
public function get_all($sql, $is_page = false, $page_num = 10, $result_type = MYSQL_ASSOC){
if(!$is_page){
$query = $this->query($sql);
$i = 0;
$rt = array();
while ($row = mysql_fetch_array($query, $result_type))
{
$rt[$i++] = $row;
}
$this->write_log("获取全部记录（无翻页）" . $sql);
}else{
$rt = $this->page($sql, $page_num, $result_type);
}

return $rt;
}

/**
* 获取全部数据（带翻页）
* Enter description here ...
* @param $sql            sql语句
* @param $page_num        每页显示记录条数
*/
public function page($sql, $page_num, $result_type){
session_start();
$query = $this->query($sql);
$all_num = mysql_num_rows($query);                    //总条数
$page_all_num = ceil($all_num / $page_num);            //总页数
$page = empty($_GET['page']) ? 1 : $_GET['page'];    //当前页数
$page = (int)$page;                                    //安全强制转换
$limit_str = ($page - 1) * $page_num;                //记录起始数

$sql .= " limit $limit_str, $page_num";
$query = $this->query($sql);
$i = 0;
$rt = array();
while ($row = mysql_fetch_array($query, $result_type))
{
$rt[$i++] = $row;
}
$this->write_log("获取翻页记录（带翻页）" . $sql);
$_SESSION["page_all_num"] = $page_all_num;
$_SESSION["next"] = $page >= $page_all_num ? $page_all_num : $page + 1;
$_SESSION["pre"] = $page <= 1 ? 1 : $page - 1;
return $rt;
}

/**
* 插入
* Enter description here ...
* @param unknown_type $table
* @param unknown_type $dataArray
*/
public function insert($table,$dataArray) {
$field = "";
$value = "";
if( !is_array($dataArray) || count($dataArray) <= 0) {
$this->halt('没有要插入的数据');
return false;
}
foreach ($dataArray as $key => $val){
$field .="$key,";
$value .="'$val',";
}

$field = substr( $field,0,-1);
$value = substr( $value,0,-1);
$sql = "insert into $table($field) values($value)";
$this->write_log("插入 ".$sql);
if(!$this->query($sql)) return false;
return true;
}

/**
* 更新
* Enter description here ...
* @param unknown_type $table
* @param unknown_type $dataArray
* @param unknown_type $condition
*/
public function update( $table,$dataArray,$condition="") {
if( !is_array($dataArray) || count($dataArray)<=0) {
$this->halt('没有要更新的数据');
return false;
}
$value = "";
while( list($key,$val) = each($dataArray))
$value .= "$key = '$val',";
$value .= substr( $value,0,-1);
$sql = "update $table set $value where 1=1 and $condition";
$this->write_log("更新 ".$sql);
if(!$this->query($sql)) return false;
return true;
}

/**
* 删除
* Enter description here ...
* @param unknown_type $table
* @param unknown_type $condition
*/
public function delete( $table,$condition="") {
if( empty($condition) ) {
$this->halt('没有设置删除的条件');
return false;
}
$sql = "delete from $table where 1=1 and $condition";
$this->write_log("删除 ".$sql);
if(!$this->query($sql)) return false;
return true;
}

/**
* 返回结果集
* Enter description here ...
* @param unknown_type $query
* @param unknown_type $result_type
*/
public function fetch_array($query, $result_type = MYSQL_ASSOC){
$this->write_log("返回结果集");
return mysql_fetch_array($query, $result_type);
}

/**
* 获取记录条数
* Enter description here ...
* @param unknown_type $results
*/
public function num_rows($results) {
if(!is_bool($results)) {
$num = mysql_num_rows($results);
$this->write_log("获取的记录条数为".$num);
return $num;
} else {
return 0;
}
}

/**
* 获取最后插入的id
* Enter description here ...
*/
public function insert_id() {
$id = mysql_insert_id($this->link_id);
$this->write_log("最后插入的id为".$id);
return $id;
}

/**
* 关闭数据库连接
* Enter description here ...
*/
public function close() {
$this->write_log("已关闭数据库连接");
return @mysql_close($this->link_id);
}

/**
* 错误提示
*/
private function halt($msg = ''){
$msg .= "\r\n" . mysql_error();
$this->write_log($msg);
die($msg);
}

/**
* 写入日志文件
*/
public function write_log($msg = ''){
if($this->is_log){
$text = date("Y-m-d H:i:s") . " " . $msg . "\r\n";
fwrite($this->handle, $text);
}
}

/**
* 获得毫秒数
*/
public function microtime_float() {
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}

/**
* 析构函数
* Enter description here ...
*/
public function __destruct(){
$use_time = ($this->microtime_float()) - ($this->time);
$this->write_log("完成整个查询任务，所用时间为 " . $use_time);
if($this->is_log){
fclose($this->handle);
}
}
}
?>

<?php
$db_config = array
(
'hostname' => 'localhost',
'username' => 'root',
'password' => '123456',
'database' => 'child_games',
'charset' => 'utf8',
'pconnect' => 0,                    //是否使用持久连接(0关/1开)
'log' => 1,                            //是否开启日志(0关/1开)
'logfilepath' => './'                //日志文件目录
);
?>