效果图如下：
field1：一级部门
field2：二级部门
field3：三级部门
field4：四级部门
field5：五级部门
field6：六级部门
创建视图，view_bmcjpath
视图定义如下：
WITH RECURSIVE department_tree (id, DEPARTMENTMARK, supdepid, depth, path) AS ( -- 初始化查询(非递归部分) SELECT id, DEPARTMENTMARK, supdepid, 1 AS depth, CAST(id AS CHAR(200)) AS path FROM hrmdepartment WHERE canceled IS NULL OR canceled <> 1 UNION ALL -- 递归查询部分 SELECT D.id, D.DEPARTMENTMARK, D.supdepid, dt.depth + 1 AS depth, CONCAT(dt.path, ',', D.id) AS path FROM hrmdepartment D JOIN department_tree dt ON D.supdepid = dt.id WHERE D.canceled IS NULL OR D.canceled <> 1
),
ranked_departments AS ( SELECT *, ROW_NUMBER() OVER (PARTITION BY id ORDER BY depth DESC) AS rn FROM department_tree
)
-- 选择每个id对应depth最大的记录，并应用字段选择逻辑
SELECT id, DEPARTMENTMARK, supdepid,depth,path,SUBSTRING_INDEX(SUBSTRING_INDEX(path, ',', 1), ',', -1) AS field1, IF(LENGTH(path) - LENGTH(REPLACE(path, ',', '')) >= 1, SUBSTRING_INDEX(SUBSTRING_INDEX(path, ',', 2), ',', -1), NULL) AS field2, IF(LENGTH(path) - LENGTH(REPLACE(path, ',', '')) >= 2, SUBSTRING_INDEX(SUBSTRING_INDEX(path, ',', 3), ',', -1), NULL) AS field3, IF(LENGTH(path) - LENGTH(REPLACE(path, ',', '')) >= 3, SUBSTRING_INDEX(SUBSTRING_INDEX(path, ',', 4), ',', -1), NULL) AS field4, IF(LENGTH(path) - LENGTH(REPLACE(path, ',', '')) >= 4, SUBSTRING_INDEX(SUBSTRING_INDEX(path, ',', 5), ',', -1), NULL) AS field5, IF(LENGTH(path) - LENGTH(REPLACE(path, ',', '')) >= 5, SUBSTRING_INDEX(SUBSTRING_INDEX(path, ',', 6), ',', -1), NULL) AS field6
FROM ranked_departments
WHERE rn = 1
