[{
    "host": "127.0.0.1",
    "port": 32200,
    "username": "aaa",
    "password": "bbb",
    "db": [{
        "host": "127.0.0.1",
        "port": 3306,
        "user": "aaa",
        "passwd": "bbb",
        "db": "ccc",
        "charset": "utf8mb4"
    }, {
        "host": "127.0.0.1",
        "port": 3307,
        "user": "aaa",
        "passwd": "bbb",
        "db": "ddd"
    }]
}]