PostgreSQL + Hibernate + Spring自动创建数据库

Question

我正在使用PostgreSQL和Spring 4，希望我的应用在运行时自动创建数据库。

我的实体类是：

@Entity
@Table(name = "user", schema = "public")
public class User extends BaseEntity {

    private Integer id;
    private String name;
    private Integer contractId;

    public User() {
    }

    public User(Integer id) {
        super(id);
    }

    @Id
    @Column(name = "usr_id", nullable = false)
    @GeneratedValue(strategy= GenerationType.IDENTITY)
    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    @Basic
    @Column(name = "usr_name", nullable = true, length = -1)
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Basic
    @Column(name = "usr_contract_id", nullable = true)
    public Integer getContractId() {
        return contractId;
    }

    public void setContractId(Integer contractId) {
        this.contractId = contractId;
    }

}

HibernateConfig.java

@Configuration
@EnableTransactionManagement(proxyTargetClass = true)
@PropertySources({
    @PropertySource(value = "classpath:application.properties")})
@ConfigurationProperties(prefix = "spring.datasource")
public class HibernateConfig {

    @Autowired
    private Environment environment;

    @Autowired
    private DataSource dataSource;

    @Autowired
    private MultiTenantConnectionProvider multiTenantConnectionProvider;

    @Autowired
    private CurrentTenantIdentifierResolver currentTenantIdentifierResolver;

    public HibernateConfig() {}

    @Bean
    public LocalSessionFactoryBean sessionFactory() throws Exception {

        LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
        sessionFactory.setDataSource(dataSource);
        sessionFactory.setHibernateProperties(hibernateProperties());

        sessionFactory.setPackagesToScan(new String[] {
            "com.xxx.xxx.model",
        });

        return sessionFactory;
    }

    private Properties hibernateProperties() {
        Properties properties = new Properties();
        properties.put(DIALECT, environment.getRequiredProperty(DIALECT));
        properties.put(SHOW_SQL, environment.getRequiredProperty(SHOW_SQL));
        properties.put(FORMAT_SQL, environment.getRequiredProperty(FORMAT_SQL));
        properties.put(HBM2DDL_AUTO, environment.getRequiredProperty(HBM2DDL_AUTO));

        return properties;
    }

    @Bean
    @Primary
    @Autowired
    public HibernateTransactionManager transactionManager(SessionFactory s) {
        HibernateTransactionManager txManager = new HibernateTransactionManager();
        txManager.setSessionFactory(s);
        return txManager;
    }

    @Bean
    @Autowired
    public HibernateTemplate hibernateTemplate(SessionFactory s) {
        HibernateTemplate hibernateTemplate = new HibernateTemplate(s);
        return hibernateTemplate;
    }
}

application.properties

# Database connection settings:
jdbc.driverClassName=org.postgresql.Driver
jdbc.url=jdbc:postgresql://localhost:5432/database
jdbc.username=postgres
jdbc.password=111111

hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect
hibernate.show_sql=false
hibernate.format_sql=false
hibernate.hbm2ddl.auto=update

spring.datasource.initialSize=50
spring.datasource.maxActive=200
spring.datasource.maxIdle=200
spring.datasource.minIdle=50

但是，当我运行SQL访问表User时，将出现错误：表’User’不存在。

如何使Hibernate自动创建数据库？

Answer 1

该物业hibernate.hbm2ddl.auto将为您解决问题。创建SessionFactory时，它将自动验证模式DDL或将其导出到数据库。使用create-
drop时，显式关闭SessionFactory时将删除数据库架构。

Hibernate可以接受上述属性的这些选项。

validate：验证架构，不对数据库进行任何更改。

update：更新架构。

create：创建架构，销毁先前的数据。

create-drop：在会话结束时删除架构。