<?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
);
?>