如何在hibernate注释类中将两列作为主键

Question

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

import org.hibernate.annotations.NaturalId;

@Entity
@Table(name="user_group")
public class user_group {

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

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

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

@Column(name="trunkGroupName")
private String trunkGroupName;
@Id
@Column(name="userId")
private String userId;


@Column(name="groupId")
private String group;


public String getUserId() {
    return userId;
}


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


public String getGroup() {
    return group;
}


public void setGroup(String group) {
    this.group = group;
}

public String getServiceProvider() {
    return serviceProvider;
}

public void setServiceProvider(String serviceProvider) {
    this.serviceProvider = serviceProvider;
}

public String getEnterpriseId() {
    return enterpriseId;
}

public void setEnterpriseId(String enterpriseId) {
    this.enterpriseId = enterpriseId;
}

public String getDepartment() {
    return department;
}

public void setDepartment(String department) {
    this.department = department;
}

public String getTrunkGroupName() {
    return trunkGroupName;
}

public void setTrunkGroupName(String trunkGroupName) {
    this.trunkGroupName = trunkGroupName;
}


}

Answer 1

您应该创建一个新的@embeddable类，其中包含PK字段：

@Embeddable
public class user_groupId implements Serializable { 
    @Column(name="userId")
    private String userId;

    @Column(name="groupId")
    private String group;
}

并在@实体中作为@embeddedid:

@Entity
public class user_group {

    @EmbeddedId
    user_groupId id;

    ...
}

您还可以使用@idclass注释来实现这一目的。