Oralce 遞迴sql   

一、查詢所有子節點

SELECT *
FROM district
START WITH NAME ='平昌縣'
CONNECT BY PRIOR parent_id=ID

二、查詢所有父節點

SELECT *
FROM district
START WITH NAME ='平昌縣'
CONNECT BY PRIOR parent_id=ID

這個語法很好理解，就是遞迴語法，從什麼節點依次去找。。

引用文獻：https://www.cnblogs.com/Soprano/p/10659127.html

Mybatis 遞迴查詢

 <resultMap id="getSelf" type="net.chunxiao.vo.GoodsCategoryVo">
        <id column="goodscateid" property="goodscateid"></id>
        <result column="name" property="name"></result>
        <collection property="catelist" select="getCategory" column="goodscateid"></collection>
        <!--查到的cid作為下次的pid-->
    </resultMap>
 
    <select id="getCategory" resultMap="getSelf">
        select * from goods_category where status=0 AND parentid=#{pid}
        ORDER BY displayorder,goodscateid
 

mybatis 介面：

List<GoodsCategoryVo> getCategory(Integer pid);

實體類：

public class GoodsCategoryVo {
    private Integer goodscateid;
    private String name;
    private Integer parentid;
    private String description;
    private Integer displayorder;
    private Double commissionrate;
    private Integer enabled;
    private List<GoodsCategoryVo> catelist;
……
}
 

參考文獻：https://blog.csdn.net/janet796/article/details/79500349

mybatsi 呼叫儲存過程：

mybatis 介面：

void addDep(@Param("dep") Department department);

xml中寫法：

<select id="addDep" statementType="CALLABLE">
    call addDep(#{dep.name,mode=IN,jdbcType=VARCHAR},#{dep.parentId,mode=IN,jdbcType=INTEGER},#{dep.enabled,mode=IN,jdbcType=BOOLEAN},#{dep.result,mode=OUT,jdbcType=INTEGER},#{dep.id,mode=OUT,jdbcType=BIGINT})
</select>
 

解釋：

注意statementType呼叫表示這是一個儲存過程，mode=IN表示這是輸入引數，mode=OUT表示這是輸出引數，呼叫成功之後，在service中獲取department的id和result欄位，就能拿到相應的呼叫結果了。

參考文獻：https://github.com/lenve/vhr/wiki/13.%E9%80%92%E5%BD%92%E6%9F%A5%E8%AF%A2%E4%B8%8E%E5%AD%98%E5%82%A8%E8%BF%87%E7%A8%8B%