hibernate_sequence表没有在MySQL中创建

Question

我在Spring启动应用程序中使用MySQL作为数据库。我删除了数据库并再次创建它并运行Junit测试，它现在没有创建hibernate_sequence表，但它确实拥有该表。

我的实体类看起来像这样

@Entity
public class Greeting {

@Id
@GeneratedValue
private Long id;

private String text;
//getters & setters
}

我的Hibernate属性

spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
spring.jpa.properties.hibernate.hbm2ddl.auto=update
spring.jpa.properties.hibernate.show_sql=true
spring.jpa.properties.hibernate.connection.sid=xe
spring.jpa.properties.hibernate.connection.characterEncoding=utf8
spring.jpa.properties.hibernate.connection.CharSet=utf8
spring.jpa.properties.hibernate.current_session_context_class=org.springframework.orm.hibernate5.LocalSessionFactoryBean
spring.jpa.properties.hibernate.id.new_generator_mappings=true

我的Junit测试

@RunWith(SpringRunner.class)
@ContextConfiguration(locations = { "classpath:applicationContext.xml" })
@SpringBootTest
public class GreetingRepositoryDAOTest {
    @Resource
    private BaseRepository greetingRepositoryImpl;
    @Test
    public void test() {
        Greeting gr = new Greeting();
        gr.setText("Third Text");
        greetingRepositoryImpl.save(gr);
    }
}

Answer 1

hbm2ddl values

使用create代替update

示例：

spring.jpa.properties.hibernate.hbm2ddl.auto=create

Database URL

将以下参数添加到数据库URL以自动创建数据库：createDatabaseIfNotExist=true

示例：

spring.datasource.url=jdbc:mysql://localhost/testdb?createDatabaseIfNotExist=true

Answer 2

我不知道，我是对还是错。我希望它能成功。

@Entity
public class Greeting {

@Id
//GenerationType.IDENTITY use for create primary key
//GenerationType.AUTO use for create table without primary key
//for this reason hibernate create a table hibernate_sequence that store 
//last value (auto incremented value)
@GeneratedValue(strategy=GenerationType.IDENTITY)
private Long id;

private String text;
//getters & setters
}