Spring引导应用程序中的H2 Schema为空

Question

我正在设置这里描述的准系统Spring Boot项目,我遇到了基本设置的问题.

似乎没有调用DatabaseLoader,当我打开这个项目的H2控制台时,我看不到包含Employee表的模式.

这是我的pom.xml的相关部分:

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-rest</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>

    <dependency>
        <groupId>com.h2database</groupId>
        <artifactId>h2</artifactId>
        <!-- 
        <scope>runtime</scope>
         -->
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.16.4</version>
        <scope>provided</scope>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <optional>true</optional>
    </dependency>
</dependencies>

我的域名:

@Data
@Entity
public class Employee {
    private @Id @GeneratedValue Long id;
    private String firstName;
    private String lastName;
    private String description;

    public Employee() {}

    public Employee(String firstName, String lastName, String description) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.description = description;
    }

}

和数据库加载器:公共类DatabaseLoader实现CommandLineRunner {private final EmployeeRepository repository;

    @Autowired
    public DatabaseLoader(EmployeeRepository repository) {
        this.repository = repository;
    }

    @Override
    public void run(String... strings) throws Exception {
        this.repository.save(new Employee("duke", "earl", "dude"));
    }

}

在localhost:8080/console启动应用程序后导航到控制台只显示了一个INFORMATION_SCHEMA和用户菜单的jdbc:h2:〜/ test.我还将其设置为CRUD存储库,虽然我可以发布到它,但似乎没有保存任何属性数据,但是可以识别Employees资源.

POST:{"firstName": "Bilbo", "lastName": "Baggxins", "description": "burglar"}

回来:

{
  "_links": {
    "self": {
      "href": "http://localhost:8080/api/employees/4"
    },
    "employee": {
      "href": "http://localhost:8080/api/employees/4"
    }
  }
}

Answer 1

Spring Boot的默认h2 url是: jdbc:h2:mem:testdb

要使用jdbc:h2:~/test你必须将其添加到您的application.properties:

spring.h2.console.enabled=true
spring.datasource.url=jdbc:h2:~/test

发生了什么,你是在spring-boot的内存数据库(testdb)中编写Employee.然后,打开h2-console jdbc:h2:~/test,动态创建它,让你浏览空虚.

有了spring.h2.console.enabled=true你可以打开浏览器http://localhost:8080/h2-console,并查看数据库的内容.使用以下设置:

• 保存的设置:通用H2(嵌入式)
• 驱动程序类:org.h2.Driver
• URL:jdbc:h2:mem:testdb
• 用户名:sa
• 密码: