MyBatis 一對一查詢方式一

一、創建數據庫 SQL

CREATE TABLE husband (husbandId INT, husbandName VARCHAR(20), husbandAge INT);

CREATE TABLE wife (wifeId INT, hId INT, wifeName VARCHAR(20), wifeAge INT);

二、創建與數據庫表對應的實體類

public class Husband implements Serializable {

    private int husbandId;
    private String husbandName;
    private int husbandAge;
    ...
}

public class Wife implements Serializable {

    private int wifeId;
    private int hid;
    private String wifeName;
    private int wifeAge;
    ...
}

二、創建與查詢結果對應的實體類

public class HusbandWife implements Serializable {

    private String husbandName;
    private int husbandAge;
    private String wifeName;
    private int wifeAge;
	...
}

注意：與查詢結果對應的實體類也可以通過繼承 Wife 或 Husband 類實現。

三、持久層接口

public interface IHusbandWifeDao {

    List<HusbandWife> findAll();
}

四、持久層接口映射文件

<mapper namespace="chu.yi.bo.dao.IHusbandWifeDao">
	<select id="findAll" resultType="chu.yi.bo.domain.HusbandWife">
	    select h.husbandName,h.husbandAge,w.wifeName,w.wifeAge from husband h,wife w where h.husbandId = w.hid;
	</select>
</mapper>

五、測試

List<HusbandWife> husbandWifeList = husbandWifeDao.findAll();