Hibernate 复合主键

　　直接上代码：

UserRole.java

@Entity
@Table(name = "sys_users_roles")
@IdClass(UserRoleCompositePK.class)
public class UserRole implements Serializable {
    
    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    @Id
    @Column(name = "user_id")
    private Long userId;
    
    @Id
    @Column(name = "role_id")
    private Long roleId;

    public Long getUserId() {
        return userId;
    }

    public void setUserId(Long userId) {
        this.userId = userId;
    }

    public Long getRoleId() {
        return roleId;
    }

    public void setRoleId(Long roleId) {
        this.roleId = roleId;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        UserRole userRole = (UserRole) o;

        if (roleId != null ? !roleId.equals(userRole.roleId) : userRole.roleId != null) return false;
        if (userId != null ? !userId.equals(userRole.userId) : userRole.userId != null) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = userId != null ? userId.hashCode() : 0;
        result = 31 * result + (roleId != null ? roleId.hashCode() : 0);
        return result;
    }

    @Override
    public String toString() {
        return "UserRole{" +
                "userId=" + userId +
                ", roleId=" + roleId +
                '}';
    }
}

 

UserRoleCompositePK

public class UserRoleCompositePK implements Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    
    @Column(name = "user_id")
    private Integer userId;

    @Column(name = "role_id")
    private Integer roleId;

    public Integer getUserId() {
        return userId;
    }

    public Integer getRoleId() {
        return roleId;
    }

    public void setUserId(Integer userId) {
        this.userId = userId;
    }

    public void setRoleId(Integer roleId) {
        this.roleId = roleId;
    }
    
    
}

 

　　这样，数据库就会新增一个具有复合主键的表 sys_users_roles。

　　以上。