[英]Hibernate one to many mapping where one class has a composite primary key on many side
我想使用休眠使用内部联接查询两个表。
两张表如下。
CREATE TABLE systemuser
( system_user_id
INT(20)NOT NULL AUTO_INCREMENT, user_name
VARCHAR(50)NOT NULL system_user_id
',PRIMARY KEY( system_user_id
)
)
CREATE TABLE role
( system_user_id
INT(20)NOT NULL, role_id
INT(20)NOT NULL system_user_id,role_id
',PRIMARY KEY( system_user_id,role_id
),CONSTRAINT FK_SYSTEM_USER_ID
FOREIGN KEY( system_user_id
)REFERENCES systemuser
( system_user_id
)
这两个表具有一对多的关系。
这些拖曳的Bean类如下。
@Entity(name = "role")
@IdClass(RoleCompositeKey.class)
public class Role extends implements java.io.Serializable {
private int roleId =0;
private int systemUserId =0;
private SystemUser systemUser;
public Role(){
}
public void setRoleId(int roleId){
this.roleId = roleId;
}
@Id
@Column(name = "role_Id")
public int getRoleId(){
return roleId;
}
public void setSystemUserId(int systemUserId){
this.systemUserId = systemUserId;
}
@Id
@Column(name="system_user_id")
public int getSystemUserId(){
return systemUserId;
}
public void setSystemUser(SystemUser systemUser){
this.systemUser= systemUser;
}
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "system_user_id", nullable = false)
public SystemUser getSystemUser(){
return systemUser;
}
}
@Entity
@Table(name = "systemuser",uniqueConstraints = {
@UniqueConstraint(columnNames = "system_user_id"),
@UniqueConstraint(columnNames = "user_name") })
public class SystemUser {
private int systemUserId = 0;
private String userName = null;
private Set<Role> roleList;
public SystemUser(){
}
public void setUserName(String userName) {
this.userName = userName;
}
@Column(name = "user_name")
public String getUserName() {
return userName;
}
public void setSystemUserId(int systemUserId){
this.systemUserId = systemUserId;
}
@Id
@Column(name="system_user_id")
public int getSystemUserId(){
return systemUserId;
}
public void setRole(Set<Role> roleList){
this.roleList = roleList;
}
@OneToMany(fetch = FetchType.LAZY, mappedBy = "systemUser")
public Set<Role> getRole(){
return roleList;
}
}
但我说错了
“ ........构造函数引发异常;嵌套异常为org.hibernate.MappingException:实体中映射的重复列:.... beans.Role列:system_user_id(应使用insert =” false“更新进行映射=“ false”)“
有人可以帮我吗? 任何帮助深表感谢!
提前致谢!
“实体映射中的重复列”。 您两次声明角色,关系。 删除这个。
@Id
@Column(name="system_user_id")
public int getSystemUserId(){
return systemUserId;
}
离开这一个
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "system_user_id", nullable = false)
public SystemUser getSystemUser(){
return systemUser;
}
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