errno: -4078, code: ‘ECONNREFUSED‘, syscall: ‘connect‘, address: ‘127.0.0.1‘, port: 3306； Postman error

problem ：

node ./app.js Later error reporting ; meanwhile ,postman Also reported wrong , The interface cannot be tested normally .

Problem solving ：

1. open default.json.

2. And the port number port From the original 3306 It is amended as follows 3308( because 3306 It's already occupied ), preservation .

ps：dbconfig Class is responsible for configuring database access information , Include : Server address 、 port 、 Database instance name 、 user name 、 User password 、 Character set, etc. .

3. stay app.js In the directory （ That is to say vue_api_server） Next cmd, And again node ./app.js（ So that api The interface project runs ）, Successfully connected to the database . And now postman You can also send requests and return results .