[BUG]: reverse_image_search failed while run with custom MYSQL_PORT

[matrixji]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

Follow the guide, deploy the reverse_image_search example, while using the non-default port for MySql and using env MYSQL_PORT pass it to the server. But server start failed.

Trackback log:

Traceback (most recent call last):
  File "src/main.py", line 33, in <module>
    MYSQL_CLI = MySQLHelper()
  File "/home/jibin/1018/bootcamp/solutions/reverse_image_search/quick_deploy/server/src/mysql_helpers.py", line 11, in __init__
    local_infile=True)
  File "/home/jibin/1018/bootcamp/solutions/reverse_image_search/quick_deploy/server/venv/lib/python3.6/site-packages/pymysql/connections.py", line 290, in __init__
    raise ValueError("port should be of type int")
ValueError: port should be of type int

Expected Behavior

Hope server started

Steps To Reproduce

1. export MYSQL_PORT=33060
2. start server by code python main.py
3. Got error output.

Software version

Milvus: 2.0.0rc7, not related
Server: N/A
Client: N/A

Anything else?

Have some investigation on code, in config.py some value are read from env, but the code like MYSQL_PORT = os.getenv("MYSQL_PORT", 3306) will always got a string value while MYSQL_PORT is set, so a type cast to number here is needed.

I'll raise PR for fix it.

[shiyu22]

Thank you very much :)

Close with #791