MySQL遞迴查詢樹狀表的子節點、父節點

表結構和表資料就不公示了，查詢的表user_role，主鍵是id，每條記錄有parentid欄位;

如下mysql查詢函式即可實現根據一個節點查詢所有的子節點，根據一個子節點查詢所有的父節點。對於資料量較大的時候（我這裡測試的1萬條左右）。查詢效率非常慢。建議在java程式碼中進行處理。

CREATE FUNCTION `getChildList`(rootId INT)
    RETURNS varchar(1000)
    BEGIN
      DECLARE sChildList VARCHAR(1000);
      DECLARE sChildTemp VARCHAR(1000);
      SET sChildTemp =cast(rootId as CHAR);
      WHILE sChildTemp is not null DO
        IF (sChildList is not null) THEN
          SET sChildList = concat(sChildList,',',sChildTemp);
    ELSE
      SET sChildList = concat(sChildTemp);
    END IF;
        SELECT group_concat(id) INTO sChildTemp FROM user_role where FIND_IN_SET(parentid,sChildTemp)>0;
      END WHILE;
      RETURN sChildList;
    END;
/*獲取子節點*/
/*呼叫: 1、select getChildList(0) id; 
2、select * 5From user_role where FIND_IN_SET(id, getChildList(2));
*/
 
 
CREATE FUNCTION `getParentList`(rootId INT)
    RETURNS varchar(1000)
    BEGIN
      DECLARE sParentList varchar(1000);
      DECLARE sParentTemp varchar(1000);
      SET sParentTemp =cast(rootId as CHAR);
      WHILE sParentTemp is not null DO
    IF (sParentList is not null) THEN
         SET sParentList = concat(sParentTemp,',',sParentList);
    ELSE
     SET sParentList = concat(sParentTemp);
    END IF;
        SELECT group_concat(parentid) INTO sParentTemp FROM user_role where FIND_IN_SET(id,sParentTemp)>0;
      END WHILE;
      RETURN sParentList;
    END;
/*獲取父節點*/
/*呼叫: 1、select getParentList(6) id; 
2、select * From user_role where FIND_IN_SET(id, getParentList(2));

*/