SELECT id AS id,
parent_id AS parentId,
parent_id AS parent,
name AS text
FROM mdm_center
START WITH parent_id = #{parentId}
CONNECT BY prior id = parent_idORACLE数据库查询当前数据的所有父数据（包含自己）
SELECT id AS id,
parent_id AS parentId,
parent_id AS parent,
name AS text
FROM mdm_center
START WITH id = #{centerId}
CONNECT BY prior parent_id = idORACLE数据库递归查询当前节点的父节点和子节点（tree）
原文：http://blog.51cto.com/fengcl/2072707