src/DB/Drivers/PDOSqlDriver.php
public function get($table, $fields, $where)
    {
        return $this->select($fields)->from($table)->where($where)->stmt()->fetch(PDO::FETCH_ASSOC);
    }
public function get($table, $fields, $where)
    {
        return $this->select($fields)->from($table)->where($where)->stmt()->fetch(PDO::FETCH_ASSOC);
    }
获取单条数据

@param string $table
@param string $fields
@param string|array $where
@return mixed
@throws CoreException