idea springboot報錯 Access denied for user ''@'localhost' (using password: NO)

在使用springboot鏈接數據庫時報了如下錯誤

java.sql.SQLException: Access denied for user ''@'localhost' (using password: NO)

	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
	at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:836)
	at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:456)
	at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:246)

之后發現,原來是idea自動提示的配置文件錯誤,一開始是這樣的

spring:
  datasource:
    data-username: root
    data-password: 123456
    # 如果時區報錯就需要添加 serverTimezone=UTC
    url: jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
    driver-class-name: com.mysql.cj.jdbc.Driver

改成這樣就ok

spring:
  datasource:
    username: root
    password: 123456
    # 如果時區報錯就需要添加 serverTimezone=UTC
    url: jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
    driver-class-name: com.mysql.cj.jdbc.Driver

如果還報錯可能是springboot或者mysql版本問題,我的springboot為2.2.0版本,mysql為8.0版本