header("Content-Type:text/html; charset=utf8");

/**

* MySQL读写分离类的实现

* $db_config = array(

* 'master' => array('host'=>'localhost:3306','user'=>'admin','passwd'=>'123456','db'=>'stat'),

* 'slave' => array(

* array('host'=>'localhost:3307','user'=>'admin','passwd'=>'123456','db'=>'stat'),

* array('host'=>'localhost:3308','user'=>'admin','passwd'=>'123456','db'=>'stat')

* )

* );

*

* 注释：如果slave有多个时随机连接其中的一个

*/

$db_config = array(

'master' => array('host'=>'localhost:3306','user'=>'admin','passwd'=>'123456','db'=>'stat'),

'slave' => array(

array('host'=>'localhost:3307','user'=>'admin','passwd'=>'123456','db'=>'stat'),

array('host'=>'localhost:3308','user'=>'admin','passwd'=>'123456','db'=>'stat')

)

);

$db = MySQL::getInstance('','r-w');

$sql ="SELECT call_id,caller,callee,call_time,call_money,`date`,media_money,record_money FROM `success_bill` WHERE user_id='1' AND `date` BETWEEN 1427081035 AND 1427089577 LIMIT 0,15 ";

$start_time = microtime(true);

$rs = $db->query($sql);

while ($row = $db->fetch($rs)){

echo "".$row['call_id']." ".$row['caller']." ".$row['callee']." ".$row['call_time']." ".$row['call_money']." ".$row['date']." ".$row['media_money']." ".$row['record_money']."

";

}

// var_dump($db->get($rs)) ;

$end_time = microtime(true);

echo "总耗时 ", (($end_time - $start_time)*1000), " MS\n";

echo "峰值内存 ", round(memory_get_peak_usage()/1000), " KB\n";

echo "

---

";

class MySQL

{

private static $_instance = null;//数据库连接实例

private static $_master = null;//主数据库连接实例

private static $_slave = null;//重数据库连接实例

public $_config = array();//数据库连接配置信息

public $_res = null;//查询实例句柄

public $_flag = '';//标识当前语句是在主还是从数据库上执行

public $_link = null;

/**

* 单实例

* Enter description here ...

* @param unknown_type $dbname

* @param unknown_type $mode

*/

public static function & getInstance($dbname='',$mode='rw'){

if (is_null(self::$_instance)){

self::$_instance = new self();

self::$_instance->__getConf();

self::$_instance->connect($dbname,$mode);

}

return self::$_instance;

}

/**

* 获取数据库配置信息

* Enter description here ...

*/

public function __getConf(){

global $db_config;

$this->_config['master'] = $db_config['master'];

$this->_config['slave'] = $db_config['slave'];

}

/**

* 数据库连接

* Enter description here ...

* @param $dbname 指定连接的数据库名，默认情况下连接配置文件的库

* @param $mode rw表示连接主库，r-w表示读写分离

*/

public function connect($dbname='',$mode = 'rw'){

if($mode == 'rw'){

if(is_null(self::$_master)){

$this->_master = $this->_slave = $this->conn_master($dbname);

}

}else{

if(is_null(self::$_master)){

$this->_master = $this->conn_master($dbname);

}

if(is_null(self::$_slave)){

$this->_slave = $this->conn_slave($dbname);

}

}

}

/**

* 连接到主数据库服务器

* Enter description here ...

*/

public function conn_master($dbname=''){

$_link = mysql_connect($this->_config['master']['host'],$this->_config['master']['user'],$this->_config['master']['passwd'],true) or die ("Connect ".$this->_config['master']['host']." fail.");

mysql_select_db(empty($dbname)?$this->_config['master']['db']:$dbname,$_link) or die(" The DB name ".$this->_config['master']['db']." is not exists.");

mysql_query("set names utf8",$_link);

return $_link;

}

/**

* 连接到从数据库服务器

* Enter description here ...

*/

public function conn_slave($dbname=''){

$offset = rand(0,count($this->_config['slave'])-1);

$_link = @mysql_connect($this->_config['slave'][$offset]['host'],$this->_config['slave'][$offset]['user'],$this->_config['slave'][$offset]['passwd'],true) or die(" Connect ".$this->_config['slave'][$offset]['host']." fail.");

mysql_select_db(empty($dbname)?$this->_config['slave'][$offset]['db']:$dbname,$_link) or die(" The DB name ".$this->_config['slave'][$offset]['db']." is not exists.");

mysql_query("set names utf8",$_link);

return $_link;

}

/**

* 执行数据库查询

* Enter description here ...

* @param string $sql

*/

public function query($sql,$master=true){

if($master == true || (substr(strtolower($sql),0,6) != 'select') && $master == false){

$this->_res = mysql_query($sql,$this->_master);

if(!$this->_res){

$this->_error[] = mysql_error($this->_master);

}

$this->_flag = 'master';

$this->_link = $this->_master;

} else {

$this->_res = mysql_query($sql,$this->_slave);

if(!$this->_res){

$this->_error[] = mysql_error($this->_slave);

}

$this->_flag = 'slave';

$this->_link = $this->_slave;

}

return $this->_res;

}

/**

* 获取单行记录

* Enter description here ...

* @param mixed $rs

*/

public function get($rs=''){

if(empty($rs)){

$rs = $this->_res;

}

return mysql_fetch_row($rs);

}

/**

* 获取多行记录

* Enter description here ...

* @param mixed $rs

* @param $result_type

*/

public function fetch($rs = ''){

if(empty($rs)){

$rs = $this->_res;

}

return mysql_fetch_array($rs,MYSQL_ASSOC);

}

/**

* 插入数据

* Enter description here ...

* @param unknown_type $sql

*/

public function add($sql){

$rs = $this->query($sql);

if($rs)

return mysql_insert_id($this->_link);

return false;

}

/**

* 更新数据

* Enter description here ...

* @param unknown_type $sql

*/

public function update($sql){

if(empty($sql)) return false;

$rs = $this->query($sql);

if($rs)

return $this->fetchNum();

return false;

}

/**

* 获取上一条语句影响的行数

* Enter description here ...

*/

public function fetchNum(){

return mysql_affected_rows($this->_link);

}

/**

* 析构函数,释放数据库连接资源

* Enter description here ...

*/

public function __destruct(){

mysql_close($this->_link);

}

}