parkspace_module/setting/parkspace_config.prototxt

block_size:3,
terminal_size_in_block:2,
db_config
{
    db_ip:"127.0.0.1",
    db_port:3306,
    db_username:"wk",
    db_passwd:"123456",
    db_name:"test",
    db_conn_pool_size:5
}