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服务创建顺利，但没有在数据库中创建表。

# application.properties
spring.datasource.url=jdbc:mysql://localhost:3306/userdb
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.jpa.show-sql=true
spring.jpa.database = MYSQL
spring.jpa.properties.hibernate.formate_sql=true;
spring.jpa.generate-ddl=true
spring.jpa.hibernate.ddl-auto = create
spring.jpa.hibernate.dialect = org.hibernate.dialect.MySQL8Dialect
spring.jpa.hibernate.naming_strategy = org.hibernate.cfg.ImprovedNamingStrategy