在使用SpringData JPA查詢的時候,一般都是返回Entity相關的結果。前段時間,在開發的 時候遇到了2個表聯合查詢,返回自定義的實體類,這個問題樓主也是查了好多資料,才得以解決,現在分享給大家,不足之處,敬請之出。
2個實體類UserInfo、UserLoginInfo 分別對應mysql的表user_info和user_login_info,實體類只截取了部分字段
@Data
@Entity
@Table(name = "user_info")
@JsonSerialize
public class UserInfo {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@JsonIgnore
private String uuid;
@Column(name = "usr_sys_id")
private String usrSysId;//用戶號
@Column(name = "reg_time")
private String regTime;//註冊時間
}
@Table(name = "user_login_info")
@Entity
@Data
@JsonSerialize
public class UserLoginInfo {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@JsonIgnore
private Long uuid;
@Column(name = "usr_sys_id")
private String usrSysId;//用戶號
private String email; //郵箱
@JsonIgnore
@Column(name = "email_valid_stat")
private String emailValidStat;// 郵箱狀態
@JsonIgnore
@Column(name="user_type")
private String userType;//用戶類型
}
自定義的實體類UserInfoVo
@Data
@AllArgsConstructor
@JsonSerialize
public class UserInfoVo {
private String usrSysId;
private String email;
private String loginName;
private Integer stat;
private String lstSuccTime;
private String nationCode;
private String phone;
private String gender;
}
現在要根據usr_sys_id和usr_type兩個字段,聯表user_info和user_login_info查詢用戶相關的信息,返回類型結果是 UserInfoVo,
public interface UserLoginInfoRepository extends JpaRepository<UserLoginInfo, Long> {
Optional<UserLoginInfo> findByUsrSysId(String usrSysId);
@Query(value = "SELECT new com.hylj.hust.vo.UserInfoVo( " +
"uli.usrSysId , uli.email, uli.loginName, uli.stat, uli.lstSuccTime, ui.nationCode, ui.phone, ui.gender) " +
"FROM UserLoginInfo uli inner join UserInfo ui ON " +
"uli.usrSysId = ui.usrSysId AND uli.userType= :userType AND uli.usrSysId = :usrSysId", nativeQuery = false)
Optional<UserInfoVo> findByUsrSysIdAndUserType(@Param("usrSysId") String usrSysId, @Param("userType") String userType);
}
需要 注意的是,new com.hylj.hust.vo.UserInfoVo 此處應該寫全類名,nativeQuery 要設置爲false