java - Spring Boot/Data 不重新创建表

Question

我正在尝试配置 Spring Boot/Data 以在应用程序初始化时重新创建表。 为此，我配置了 ddl-auto 来创建。我使用两个数据源。

当表不存在时，将创建它们。但是当表存在时，它们不会被重新创建。我认为 ddl-auto create (“创建架构，销毁以前的数据。”)总是会重新创建表。

application.yaml

spring:
   profiles: spring
   jpa:
      generate-ddl: true
      hibernate: 
         ddl-auto: create
      show-sql: true
      properties:
         hibernate:
            dialect: org.hibernate.dialect.MySQL5InnoDBDialect
            format_sql: true

dba:
   datasource:
      url: jdbc:mysql://localhost:3306/DBA
      username: root
      password: 123
      driver-class-name: com.mysql.cj.jdbc.Driver

dbb:
   datasource:
      url: jdbc:mysql://localhost:3306/DBB
      username: root
      password: 123
      driver-class-name: com.mysql.cj.jdbc.Driver

我的配置文件:

@SpringBootApplication
@ComponentScan( basePackages = {"com.example.mds"} )
public class EMdsApplication {

    public static void main(String[] args) {
        SpringApplication.run(EMdsApplication.class, args);
    }

}

DBAConfig.java

@Configuration
@EntityScan(basePackages = {"com.example.mds.model"} )
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef = "dba_emf",
        transactionManagerRef = "dba_tm",
        basePackages = {"com.example.mds.repository"}
)
public class DBAConfig {


    @Primary
    @Bean(name = "dba_ds")
    @ConfigurationProperties(prefix = "dba.datasource")
    public DataSource dataSource(@Qualifier("dba_dsp") DataSourceProperties properties) {
        return properties.initializeDataSourceBuilder().type(HikariDataSource.class).build();
    }

    @Primary
    @Bean(name = "dba_emf")
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(EntityManagerFactoryBuilder builder, @Qualifier("dba_ds") DataSource datasource) {
        return builder
                  .dataSource(datasource)
                  .packages("com.example.mds.model")
                  .persistenceUnit("dba_pu")
                  .build();
    }

    @Primary
    @Bean(name = "dba_tm")
    public PlatformTransactionManager transactionManager(@Qualifier("dba_emf") EntityManagerFactory entityManagerFactory) {
        return new JpaTransactionManager(entityManagerFactory);
    }

    @Primary
    @Bean(name = "dba_dsp")
    @ConfigurationProperties(prefix = "dba.datasource")
    public DataSourceProperties dataSourceProperties() {
        return new DataSourceProperties();
    }   

}

DBBConfig.java

@Configuration
@EntityScan(basePackages = {"com.example.mds.dbb.model"} )
@EnableTransactionManagement
@EnableJpaRepositories(
        entityManagerFactoryRef = "dbb_emf",
        transactionManagerRef = "dbb_tm",
        basePackages = {"com.example.mds.dbb.repository"}
)
public class DBBConfig {

    @Bean(name = "dbb_ds")
    @ConfigurationProperties(prefix = "dbb.datasource")
    public DataSource dataSource(@Qualifier("dbb_dsp") DataSourceProperties properties) {
        return properties.initializeDataSourceBuilder().type(HikariDataSource.class).build();
    }

    @Bean(name = "dbb_emf")
    public LocalContainerEntityManagerFactoryBean entityManagerFactory(EntityManagerFactoryBuilder builder, @Qualifier("dbb_ds") DataSource datasource) {
        return builder
                  .dataSource(datasource)
                  .packages("com.example.mds.dbb.model")
                  .persistenceUnit("dbb_pu")
                  .build();
    }

    @Bean(name = "dbb_tm")
    public PlatformTransactionManager transactionManager(@Qualifier("dbb_emf") EntityManagerFactory entityManagerFactory) {
        return new JpaTransactionManager(entityManagerFactory);
    }

    @Bean(name = "dbb_dsp")
    @ConfigurationProperties(prefix = "dbb.datasource")
    public DataSourceProperties dataSourceProperties() {
        return new DataSourceProperties();
    }   

}

Answer 1

如果您想要删除并创建表，则需要使用 create-drop 属性。这应该仅用于测试目的，而不是用于生产用途。 引用this详情请咨询