springboot中关于自动建表,无法更新字段的问题

jpa:
    database-platform: org.hibernate.dialect.MySQL5InnoDBDialect
    database: MYSQL
    show-sql: true
    properties:
      hibernate.id.new_generator_mappings: true
      hibernate.cache.use_second_level_cache: false
      hibernate.cache.use_query_cache: false
      hibernate.generate_statistics: false
      hibernate.hbm2ddl.auto: create # 自动生成建表语句
    hibernate:
      naming:
        physical-strategy: org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl # 取消驼峰式命名
hibernate.hbm2ddl.auto: create # 自动生成建表语句

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
 <dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/dbdbd?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: *
    password: *
    driver-class-name: com.mysql.jdbc.Driver
  jpa:
    hibernate:
      ddl-auto: update
    database: mysql
    show-sql: true