Spring 启动 - 多数据源 - hbm2ddl 问题

Question

我在 Spring Boot（版本 2.1.3.Final）应用程序中定义了多个数据源，对于其中一个，我将 hbm2ddl 设置为更新。但是，如果我第二次运行应用程序，它总是尝试执行 CREATE TABLE 语句（而不是 alter，或者在实体没有变化的情况下没有语句）

数据源定义如下所示：

    // @formatter:off
@EnableJpaRepositories(entityManagerFactoryRef = "triggerEMF", transactionManagerRef = "triggerTM", basePackages = {
        "com.customer.trigger.repository" }, excludeFilters = @Filter(CDHRepository.class))
// @formatter:on
@Configuration
@EnableTransactionManagement
public class TriggerDSConfig {

    private static final Logger LOGGER = LoggerFactory.getLogger(TriggerDSConfig.class);

    @Autowired
    private Environment env;

    @Primary
    @Bean(name = "triggerDS")
    @ConfigurationProperties("trigger.datasource")
    public DataSource dataSource() {

        return DataSourceBuilder.create().build();

    }

    @Primary
    @Bean(name = "triggerTM")
    public PlatformTransactionManager psqlTransactionManager(@Qualifier("triggerEMF") EntityManagerFactory customerEntityManagerFactory) {
        return new JpaTransactionManager(customerEntityManagerFactory);

    }

    @Primary
    @Bean(name = "triggerEMF")
    public LocalContainerEntityManagerFactoryBean psqlEntityManager(EntityManagerFactoryBuilder builder) throws SQLException {
        Map<String, String> props = new HashMap<String, String>();
        props.put("hibernate.hbm2ddl.auto", env.getProperty("trigger.hbm2ddl"));
        props.put("hibernate.dialect", env.getProperty("trigger.dialect"));
        props.put("hibernate.default_schema", "public");

        DataSource ds = dataSource();
        ds.getConnection(); // eager connection pool init

        return builder.dataSource(ds) //
                .packages("com.customer.trigger.model.entity") //
                .persistenceUnit("trigger-pu") //
                .properties(props) //
                .build(); //

    }

    // Initialise & Populate DS in Local profile
    @Bean
    @Profile({ "local" })
    public DataSourceInitializer triggerEngineDBInit(@Qualifier("triggerDS") DataSource datasource) {

        ResourceDatabasePopulator resourceDatabasePopulator = new ResourceDatabasePopulator();
        resourceDatabasePopulator.addScript(new ClassPathResource("db/schema-triggerengine.sql"));
        resourceDatabasePopulator.addScript(new ClassPathResource("db/data-triggerengine.sql"));

        DataSourceInitializer dataSourceInitializer = new DataSourceInitializer();
        dataSourceInitializer.setDataSource(datasource);
        dataSourceInitializer.setDatabasePopulator(resourceDatabasePopulator);
        dataSourceInitializer.setEnabled(env.getProperty("trigger.datasource.initialize", Boolean.class, false));
        return dataSourceInitializer;
    }

}

此数据源的 YAML 定义如下所示：

    trigger:
  datasource:
    jdbcUrl: jdbc:h2:~/triggerdb2;DB_CLOSE_ON_EXIT=FALSE;MODE=PostgreSQL
    username: sa
    password: sa
  hbm2ddl: update
  dialect: org.hibernate.dialect.H2Dialect

我可以确认没有执行 DDL 脚本。这是失败的 hbm2ddl。我对它进行了相当深入的调试，目前已经做到了 class： https://github.com/hibernate/hibernate-orm/blob/master/hibernate-core/src/main/java/org/hibernate/tool/schema/internal/GroupedSchemaMigratorImpl.java

这是有问题的代码： https://github.com/hibernate/hibernate-orm/blob/master/hibernate-core/src/main/java/org/hibernate/tool/schema/internal/GroupedSchemaMigratorImpl.java#L69-L71

table 信息为空 - 因此休眠生成 create table 语句（而不是 alter or no 语句）。但是当然 table 存在，所以失败并出现以下错误：

            at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:67)
        at org.hibernate.tool.schema.internal.AbstractSchemaMigrator.applySqlString(AbstractSchemaMigrator.java:559)
        at org.hibernate.tool.schema.internal.AbstractSchemaMigrator.applySqlStrings(AbstractSchemaMigrator.java:504)
        at org.hibernate.tool.schema.internal.AbstractSchemaMigrator.createTable(AbstractSchemaMigrator.java:277)
        at org.hibernate.tool.schema.internal.GroupedSchemaMigratorImpl.performTablesMigration(GroupedSchemaMigratorImpl.java:71)
        at org.hibernate.tool.schema.internal.AbstractSchemaMigrator.performMigration(AbstractSchemaMigrator.java:207)
        at org.hibernate.tool.schema.internal.AbstractSchemaMigrator.doMigration(AbstractSchemaMigrator.java:114)
        at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.performDatabaseAction(SchemaManagementToolCoordinator.java:183)
        at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.process(SchemaManagementToolCoordinator.java:72)
        at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:310)
        at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:467)
        at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:939)
        at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:57)
        at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:365)
        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:390)
        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:377)
        at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.afterPropertiesSet(LocalContainerEntityManagerFactoryBean.java:341)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1821)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1758)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean[=13=](AbstractBeanFactory.java:320)
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
        at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1105)
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142)
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775)
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:316)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248)
        at com.customer.trigger.Application.main(Application.java:11)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.springframework.boot.maven.AbstractRunMojo$LaunchRunner.run(AbstractRunMojo.java:558)
        at java.lang.Thread.run(Thread.java:748)
Caused by: org.h2.jdbc.JdbcSQLException: Table "SUGGESTION_VOD__C" already exists; SQL statement:

PostgreSQL 也会出现此问题（不仅仅是 H2）

有什么想法吗？

复制者：

https://github.com/agiertli/spring-boot-hbm-ddl-issue

Answer 1

我读到了你的问题。问题不取决于数据库，我认为你的问题是你没有为你的项目使用数据库版本控制。版本控制为您处理所有这些事情（它知道何时创建或更改等等）。

这些是您可以使用的很好的数据库版本控制 liquibase flyway

我的意见是使用 liquibase，因为它有很好的文档，更容易

Answer 2

我运行你的项目在我的本地。当我运行两次收到 table 已经存在的错误时，你是对的。解决方案是

Map<String, String> props = new HashMap<String, String>();
props.put("hibernate.hbm2ddl.auto", "update");
props.put("hibernate.dialect", env.getProperty("trigger.dialect"));
props.put("hibernate.default_schema", env.getProperty("trigger.schema"));

您的 yml 中可能缺少一些属性。还对这些属性使用@Value。

Answer 3

删除以下 yaml 配置后：

       # temp:
        #  use_jdbc_metadata_defaults: "false"

问题不再出现。当然，现在我们收到了奇怪的 CLOB 相关错误，但它们似乎没有真正的影响，所以这是一个单独的问题。

Spring 启动 - 多数据源 - hbm2ddl 问题

Spring Boot - multiple datasource - hbm2ddl issue

java

hibernate

datasource

spring-boot