Jpa之复合主键

 jpa设置组合主键需要新建复合主键类，而且需要实现 Serializable接口

public class RolePermissionKey implements Serializable {
    private int rid;
    private String pid;

    public int getRid() {
        return rid;
    }

    public void setRid(int rid) {
        this.rid = rid;
    }


    public String getPid() {
        return pid;
    }

    public void setPid(String pid) {
        this.pid = pid;
    }

    public RolePermissionKey() {
    }

    public RolePermissionKey(int rid, String pid) {
        this.rid = rid;
        this.pid = pid;
    }
}

在实体类

@Entity
@Table(name = "t_role_permission")
@IdClass(com.zking.p2.entity.RolePermissionKey.class) //指定你的组合主键类
public class RolePermission {
    private int rid;
    private String pid;

    @Id
    public int getRid() {
        return rid;
    }

    public void setRid(int rid) {
        this.rid = rid;
    }
    @Id
    public String getPid() {
        return pid;
    }

    public void setPid(String pid) {
        this.pid = pid;
    }
}