2015-02-24 164 views
0

我正在Java EE中制作一个小型库项目。我创作了3个表格,并与作者,流派和书籍一起上课。现在我尝试使用Hibernate来连接它,但我没有IDE如何confire注解:请帮我:)Hibernate注释。如何注释?

bookTable:

| id_book | author_id |标题| genre_id |描述|照片|

genreTable:

| genre_id |流派|

authorTable:

| author_id |作者|

这是很容易的结构:

bookTable.author_id - authorTable.author_id =多对多

bookTable.genre_id - genreTable.genre_id = OneToOne

下面有我的POJO类:

本书

@Entity 
@Table(name = "books") 
public class Book implements Serializable{ 

    private static final long serialVersionUID = -5057364006691079475L; 

    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    @Column(name = "user_id") 
    private Integer user_id; 
    private Author author; 
    private String description; 
    private BookGenre genre; 
    private String title; 


    public String getDescription() { 
     return description; 
    } 

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

    public String getTitle() { 
     return title; 
    } 

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

    public Integer getUser_id() { 
     return user_id; 
    } 

    public void setUser_id(Integer user_id) { 
     this.user_id = user_id; 
    } 

    public Author getAuthor() { 
     return author; 
    } 

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

    public BookGenre getGenre() { 
     return genre; 
    } 

    public void setGenre(BookGenre genre) { 
     this.genre = genre; 
    } 

} 

作者

@Entity 
@Table(name = "author") 
public class Author implements Serializable{ 

    private static final long serialVersionUID = 1L; 

    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    @Column(name = "author_id") 
    private Integer author_id; 

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

    public Integer getAuthor_id() { 
     return author_id; 
    } 

    public void setAuthor_id(Integer author_id) { 
     this.author_id = author_id; 
    } 

    public String getAuthor() { 
     return author; 
    } 

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

类型

@Entity 
@Table(name = "genre") 
public class BookGenre implements Serializable{ 

    private static final long serialVersionUID = 1L; 

    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    @Column(name = "genre_id") 
    private Integer genreId; 

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


    public Integer getGenreId() { 
     return genreId; 
    } 
    public void setGenreId(Integer genreId) { 
     this.genreId = genreId; 
    } 
    public String getGenre() { 
     return genre; 
    } 
    public void setGenre(String genre) { 
     this.genre = genre; 
    } 

} 

回答

0

这是实体来说,没有的POJO,但他们看起来还不错。对他们来说,你通常不需要照顾。最好的方法是,在将项目与数据库连接后,自动生成它们。 Hibernate会照顾一切。更有趣的是你的DAO看起来如何,bcz。即与数据库进行图层通信。该实体只是Java端数据库表的表示。 I guess you already connected your project with the database? 请提供您的数据库访问对象(DAO)以获得进一步的帮助。如果你还没有到目前为止here you can get help