private function init_read_connection()
{
if ($this->has_read_db && $this->read_connection === null) {
$connect_array = $this->connect_array;
$db_read_host_array = isset($this->connect_array['read_db_hosts']) ? $this->connect_array['read_db_hosts'] : array();
$db = $connect_array['db'];
if ($db_read_host_array) {
if (isset($connect_array['read_db_arithmetic']) && $connect_array['read_db_arithmetic'] == 'roll') {
//轮询算法
$host = cls_rollrand::get_db_host_roll($db_read_host_array, $db);
} else {
$host = cls_rollrand::get_db_host_rand($db_read_host_array, $db);
//随机
}
if (empty($host)) {
//如果从库的host不存在，去主库中查找对应的host
$db_host_array = isset($this->connect_array['db_hosts']) ? $this->connect_array['db_hosts'] : array();
if ($db_host_array) {
$host = $db_host_array[$db];
if (stripos($host, ',')) {
//双master
$host = cls_rollrand::get_write_db_host_rand($host);
}
} else {
$host = $connect_array['host'];
}
}
}
$this->read_connection = new mysqli($host, $connect_array['user_name'], $connect_array['pass_word'], $connect_array['db'], $connect_array['port']);
if ($this->read_connection->error) {
echo 'Database Connect Error : ' . $this->read_connection->error;
} else {
$this->read_connection->query("SET NAMES 'utf8'");
}
}
}
private function getReadConnection()
{
if (!$this->read_connection) {
$connect_array = $this->connect_array;
// 载入读库配置
$db_name = $this->connect_array['db'];
$db_read_host_array = isset($this->connect_array['read_db_hosts']) ? $this->connect_array['read_db_hosts'] : array();
$host = null;
if (isset($connect_array['read_db_arithmetic']) && $connect_array['read_db_arithmetic'] == 'roll') {
//轮询算法
$host = cls_rollrand::get_db_host_roll($db_read_host_array, $db_name);
} else {
$host = cls_rollrand::get_db_host_rand($db_read_host_array, $db_name);
//随机
}
if (empty($host)) {
//如果从库对应的host不存在，则从主库列表查找
$db_host_array = isset($connect_array['db_hosts']) ? $connect_array['db_hosts'] : array();
if ($db_host_array) {
$host = $db_host_array[$db_name];
if (stripos($host, ',')) {
//双master
$host = cls_rollrand::get_write_db_host_rand($host);
}
} else {
$host = $connect_array['host'];
}
}
$connect_array['host'] = $host;
return $this->read_connection = $this->getDbConnection($connect_array);
}
return $this->read_connection;
}
