/**
* 取缓存
* @param $pKey
* @param $pVal
* @param int $pExp
* @return bool
*/
static function set($pKey, $pVal, $pExp = 3600)
{
return Cache_Memcache::instance()->set($pKey, $pVal, $pExp);
}
/**
* 执行SQL，并返回结果
*/
function query()
{
$tArgs = func_get_args();
$tSql = array_shift($tArgs);
# 锁表查询
if ($this->_lock) {
$tSql .= ' ' . $this->_lock;
$this->_lock = '';
}
# 使用缓存
if ($this->cache) {
$tMem =& Cache_Memcache::instance('default');
if ('md5' == $this->cache['key']) {
$this->cache['key'] = md5($tSql . ($tArgs ? join(',', $tArgs) : ''));
}
if (false !== ($tData = $tMem->get($this->cache['key']))) {
return $tData;
}
}
# 查询数据库
$this->db =& self::instance($this->_config);
if ($tArgs) {
$tQuery = $this->db->prepare($tSql);
$tQuery->execute($tArgs);
} else {
$tQuery = $this->db->query($tSql);
}
if (!$tQuery) {
$this->error = $this->db->errorInfo();
isset($this->error[1]) || ($this->error = array());
return array();
}
# 不缓存查询结果
if (!$this->cache) {
return $tQuery->fetchAll(PDO::FETCH_ASSOC);
}
# 设置缓存
$tData = $tQuery->fetchAll(PDO::FETCH_ASSOC);
$tMem->set($this->cache['key'], $tData, 0, $this->cache['expire']);
$this->cache = array();
return $tData;
}