我是Dropwizard的新手,到目前为止,一切顺利,直到我开始搞乱Hibernate和
MySQL.我的问题是：Hibernate不会创建表,因此我的数据库中没有列.

运行我的jar文件时唯一的警告是：

未找到org.hibernate.cfg.environment hibernate.properties

但我需要它吗？因为我已经拥有所有配置和映射.

这是我的应用程序类：

    public class LibraryApplication extends Application<LibraryConfiguration> {

    public static void main(String[] args) throws Exception {
        new LibraryApplication().run(args);
    }


    @Override
    public String getName() {
        return "hello backend";
    }


    private final HibernateBundle<LibraryConfiguration> hibernate = new HibernateBundle<LibraryConfiguration>(Book.class){ //more entities can be added separated with a coma
        public DataSourceFactory getDataSourceFactory(LibraryConfiguration configuration) {
            return configuration.getDataSourceFactory();
        }
    };


    @Override
    public void initialize(Bootstrap<LibraryConfiguration> bootstrap) {

        bootstrap.addBundle(new AssetsBundle("/webapp", "/", "index.html", "static"));
        bootstrap.addBundle(hibernate);
    }

    @Override
    public void run(LibraryConfiguration configuration,
            Environment environment) {

        final BookDAO dao = new BookDAO(hibernate.getSessionFactory());

        final TestResource resource = new TestResource(
                configuration.getTemplate(), configuration.getDefaultName());


        final TemplateHealthCheck healthCheck = new TemplateHealthCheck(
                configuration.getTemplate());


        environment.healthChecks().register("template", healthCheck); //register the health check
        environment.jersey().register(resource); //register the resource class
        environment.jersey().register(new BookResource(dao));
    }

}

YAML文件：

    server:
  type: simple
  rootPath: '/api/*'
  applicationContextPath: /
  connector:
    type: http
    port: 8080

template: Hello, %s!
defaultName: back-end


database:
  # the name of your JDBC driver
  driverClass: com.mysql.jdbc.Driver 

 # the JDBC URL
  url: jdbc:mysql://localhost:3306/books   

  # the username
  user: root

  # the password
  password: root

  # any properties specific to your JDBC driver:
  properties:
    charSet: UTF-8
    hibernate.dialect: org.hibernate.dialect.MySQLDialect  #org.hibernate.dialect.MySQL5InnoDBDialect  
    hibernate.hbm2ddl.auto: create

Configurtion类：

    public class LibraryConfiguration extends Configuration{

    @Valid
    @NotNull
    @JsonProperty
    private DataSourceFactory database = new DataSourceFactory();

    @JsonProperty("database")
    public DataSourceFactory getDataSourceFactory() {
        return database;
    }

    @NotEmpty
    private String template;

    @NotEmpty
    private String defaultName = "";

    @JsonProperty
    public String getTemplate() {
        return template;
    }

    @JsonProperty
    public void setTemplate(String template) {
        this.template = template;
    }

    @JsonProperty
    public String getDefaultName() {
        return defaultName;
    }

    @JsonProperty
    public void setDefaultName(String name) {
        this.defaultName = name;
    }
}

和我的实体：

@Entity
@Table(name = "book")
@NamedQueries({
@NamedQuery(
name = "library.core.Book.findAll",
query = "SELECT b FROM book b"
    )
})
public class Book{

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column
    private Long id;

    @Column(name = "title")
    @NotNull
    private String title;

    @Column(name = "author")
    @NotNull
    private String author;

    @Column(name = "date")
    private long date;

    @Column(name = "description")
    private String description;

    @Column(name = "image")
    private String image;

    public Book(String title, String author){
        this.title = title;
        this.author = author;
    }

    @JsonProperty
    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    @JsonProperty
    public Long getId() {
        return id;
    }



    @JsonProperty
    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    @JsonProperty
    public long getDate() {
        return date;
    }

    public void setDate(long date) {
        this.date = date;
    }

    @JsonProperty
    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    @JsonProperty
    public String getImage() {
        return image;
    }

    public void setImage(String image) {
        this.image = image;
    }

    public void setId(Long id) {

        this.id = id;
    }
}

我已经去过很多教程,但没有一个真正解释如何配置hibernate.先感谢您.

最佳答案 我终于解决了这个问题,实际上这并不是什么大问题.只是一个小错误,因为它是预期的.

我的问题是Book类,IDE自动导入了LibraryApplication类中名为Book的java库,因此DB没有映射它.

另一方面,在Book类中,命名查询应如下所示：

@NamedQuery(
name = "library.core.Book.findAll",
query = "SELECT b FROM Book b"
    )

我的错误：我正在用小写字母写书.