Hibernate 不在 oracle db 中创建表

Question

我有一个与 hibernate 集成的 spring mvc 应用程序。 我有 3 个标记为用于创建休眠表的 pojo。

• Book.java 与 @Table(name = "BOOKS") 。
• 带有@Table(name = "USER_TABLE") 的User.java
• Role.java 与 @Table(name = "ROLE_TABLE")

我已经配置了会话工厂等等。

我的hibernate.hbm2ddl.auto = create-drop。但也试过create, update。

当我启动我的应用程序时，BOOKS 表正在数据库中创建。但是 USER_TABLE 和 ROLE_TABLE 没有被创建。

我得到没有例外。

当我做select * from USER_TABLE; 输出是表或视图不存在。

package com.ca.service.form;

import java.util.HashSet;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.Table;

/**
* @author jamju02
*/
@Entity
@Table(name = "ROLE_TABLE")
public class Role {
    private long id;
    private String roleName;

    private Set<User> users = new HashSet<User>();

    /**
     * @return the id
     */
     @Id
     @GeneratedValue
     @Column(name = "ROLE_ID")
    public long getId() {
        return id;
    }
    /**
     * @param id the id to set
     */
    public void setId(long id) {
        this.id = id;
    }
    /**
     * @return the roleName
     */
    public String getRoleName() {
        return roleName;
    }
    /**
     * @param roleName the roleName to set
     */
    public void setRoleName(String roleName) {
        this.roleName = roleName;
    }
    /**
     * @return the users
     */
     @ManyToMany(cascade = CascadeType.ALL)
     @JoinTable(
            name = "USERS_ROLES_TABLE",
            joinColumns = @JoinColumn(name = "ROLE_ID"),
            inverseJoinColumns = @JoinColumn(name = "USER_ID")
     )
    public Set<User> getUsers() {
        return users;
    }
    /**
     * @param users the users to set
     */
    public void setUsers(Set<User> users) {
        this.users = users;
    }
}

package com.ca.service.form;

import java.util.HashSet;
import java.util.Set;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.ManyToMany;
import javax.persistence.Table;

/**
* @author jamju02
*/
@Entity
@Table(name = "USER_TABLE")
public class User {
    private long id;
    private String username;
    private String password;
    private String email;

    private Set<Role> roles = new HashSet<Role>();

    public User(String username, String password, String email) {
        this.username = username;
        this.password = password;
        this.email = email;
    }

    // public void addRole(Role role) {
    // this.roles.add(role);
    // }

    /**
     * @return the id
     */
    @Id
    @GeneratedValue
    @Column(name = "USER_ID")
    public long getId() {
        return id;
    }

    /**
     * @param id
     *            the id to set
     */
    public void setId(long id) {
        this.id = id;
    }

    /**
     * @return the username
     */
    public String getUsername() {
        return username;
    }

    /**
     * @param username
     *            the username to set
     */
    public void setUsername(String username) {
        this.username = username;
    }

    /**
     * @return the password
     */
    public String getPassword() {
        return password;
    }

    /**
     * @param password
     *            the password to set
     */
    public void setPassword(String password) {
        this.password = password;
    }

    /**
     * @return the email
     */
    public String getEmail() {
        return email;
    }

    /**
     * @param email
     *            the email to set
     */
    public void setEmail(String email) {
        this.email = email;
    }

     /**
     * @return the roles
     */
     @ManyToMany(mappedBy = "users")
     public Set<Role> getRoles() {
         return roles;
     }

     /**
     * @param roles the roles to set
     */
     public void setRoles(Set<Role> roles) {
         this.roles = roles;
     }
}


package com.ca.service.form;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "BOOKS")
public class Book {

    @Id
    @Column(name="ID")
    @GeneratedValue
    private Integer id;

    @Column(name="BOOK_NAME")
    private String bookName;

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

    @Column(name="PRICE")
    private int price;

    @Column(name="QTY")
    private int quantity;

    public Integer getId() 
    {return id;}

    public String getBookName() 
    {return bookName;}

    public String getAuthor() 
    {return author;}

    public int getPrice() 
    {return price;}

    public int getQuantity() 
    {return quantity;}

    public void setId(Integer id) 
    {this.id = id;}

    public void setBookName(String bookName) 
    {this.bookName = bookName;}

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

    public void setPrice(int price) 
    {this.price = price;}

    public void setQuantity(int quantity) 
    {this.quantity = quantity;}
}

Answer 1

有一些原因，因为你的代码会失败。

1. 您是否将ROLE_TABLE、USER_TABLE的类文件添加到SessionFactory？

2. 正确放置注释..

   @Entity
   @Table(name = "ROLE_TABLE")
   public class Role {
   private long id;
   private String roleName;
   
   private Set<User> users = new HashSet<User>();
   
   /**
   * @return the id
   */
   @Id
   @GeneratedValue
   @Column(name = "ROLE_ID")
   public long getId() {
       return id;
   }
   

替换为：

@Entity
@Table(name = "ROLE_TABLE")
public class Role {
 @Id @GeneratedValue
 @Column(name = "ROLE_ID")
 private long id;
 private String roleName;

 private Set<User> users = new HashSet<User>();

 /**
  * @return the id
  */

 public long getId() {
   return id;
 }

您需要在声明变量之前放置 hibernate 注释。 我将您的代码与我的更改一起粘贴到了我的应用程序中，并且成功了。