与H2数据库弹簧引导jpa

Question

我正在搭配一个示例代码来运行我的springboot数据项目与jpa H2数据库。

代码如下，应用程序运行正常，但我没有看到任何表被创建，我也没有在服务器控制台中看到任何错误。我检查了日志，我没有看到任何查询被创建了。我做错了什么？

域类：

@Entity 
public class Account { 

    @Id 
    @GeneratedValue 
    private Integer accountId; 

    private String name; 

    private String accType; 

    public Integer getAccountId() { 
     return accountId; 
    } 

    public String getName() { 
     return name; 
    } 

    public String getAccType() { 
     return accType; 
    } 

    public Account(Integer accountId, String name, String accType) { 
     super(); 
     this.accountId = accountId; 
     this.name = name; 
     this.accType = accType; 
    } 

    public Account(String name, String accType) { 
     super(); 
     this.name = name; 
     this.accType = accType; 
    } 
    public Account() { 

    } 

数据Loader类：

@Component 
public class AccountLoaded { 

    private AccountRepository accountRepository; 

    public AccountLoaded(AccountRepository accountRepository) { 
     this.accountRepository = accountRepository; 
    } 

    @PostConstruct 
    private void loadData() { 
     Account account = new Account(1,"Madhu","Savings"); 
     accountRepository.save(account); 
     System.out.println("Loaded Account " + account.toString()); 
    } 

} 

库类：

@Repository 
public interface AccountRepository extends CrudRepository<Account, Integer> { 

} 

application.properties：

spring.datasource.jdbc-url=jdbc:h2:mem:test 
spring.h2.console.enabled=true 
spring.h2.console.path=/console 
spring.datasource.platform=h2 

我在服务器控制台日志：

2016-10-11 12:38:26.202 INFO 20020 --- [   main] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default' 
2016-10-11 12:38:26.217 INFO 20020 --- [   main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [ 
    name: default 
    ...] 
2016-10-11 12:38:26.285 INFO 20020 --- [   main] org.hibernate.Version     : HHH000412: Hibernate Core {5.0.11.Final} 
2016-10-11 12:38:26.287 INFO 20020 --- [   main] org.hibernate.cfg.Environment   : HHH000206: hibernate.properties not found 
2016-10-11 12:38:26.288 INFO 20020 --- [   main] org.hibernate.cfg.Environment   : HHH000021: Bytecode provider name : javassist 
2016-10-11 12:38:26.327 INFO 20020 --- [   main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.1.Final} 
2016-10-11 12:38:26.554 INFO 20020 --- [   main] org.hibernate.dialect.Dialect   : HHH000400: Using dialect: org.hibernate.dialect.H2Dialect 
2016-10-11 12:38:26.995 INFO 20020 --- [   main] org.hibernate.tool.hbm2ddl.SchemaExport : HHH000227: Running hbm2ddl schema export 
2016-10-11 12:38:27.004 INFO 20020 --- [   main] org.hibernate.tool.hbm2ddl.SchemaExport : HHH000230: Schema export complete 
2016-10-11 12:38:27.044 INFO 20020 --- [   main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default' 
Loaded Account Account [accountId=1, name=Madhu, accType=Savings] 
2016-10-11 12:38:27.587 INFO 20020 --- [   main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@b472aa: startup date [Tue Oct 11 12:38:23 CDT 2016]; root of context hierarchy 
2016-10-11 12:38:27.663 INFO 20020 --- [   main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest) 
2016-10-11 12:38:27.664 INFO 20020 --- [   main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse) 
2016-10-11 12:38:27.696 INFO 20020 --- [   main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 
2016-10-11 12:38:27.696 INFO 20020 --- [   main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 
2016-10-11 12:38:27.732 INFO 20020 --- [   main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 
2016-10-11 12:38:27.959 INFO 20020 --- [   main] o.s.j.e.a.AnnotationMBeanExporter  : Registering beans for JMX exposure on startup 
2016-10-11 12:38:28.011 INFO 20020 --- [   main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http) 
2016-10-11 12:38:28.015 INFO 20020 --- [   main] com.example.SpringdataApplication  : Started SpringdataApplication in 4.898 seconds (JVM running for 5.255) 

Answer 1

变化spring.datasource.jdbc-url=jdbc:h2:mem:test到spring.datasource.jdbc-url=jdbc:h2:file:test（测试数据库文件的文件名，还可以有名称的路径），并使用these tools一个来查看DB。

您也可以登录SQL语句到控制台，通过在spring.jpa.show-SQL设置为添加spring.jpa.show-sql: true您application.properties

Answer 2

即使全部在内存中，你会看到SQL日志完成true（在application.properties文件中）。

不要忘记将“spring.jpa.generate-ddl”设置为true（默认为false）并使您的loadData方法为事务性（请参阅Spring @Transactional注释）。

Answer 3

如果您转到嵌入式h2控制台（http://localhost:8080/console），并在那里键入正确的连接URL（jdbc：h2：mem：test），您应该看到一些东西。

默认情况下，嵌入式h2控制台不显示正确的连接URL，它会忘记：mem：part IIRC。