数据结构:
root_id | son_id | uid | title | content | createdate | type | attaches | root_id | son_id | uid | title | cont
root_id | son_id | uid | title | content | createdate | type | attaches | root_id | son_id | uid | title | cont
阅读背景：
jsp怎么从mysql数据库把树形结构展现出来
来源：互联网
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