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通过java 访问数据库而生成节点 子节点的 ID 与 父节点的关系为“父节点id_子节点id”此id为数据库中的id 同理“父节点id_子节点id_子子节点id”,因此加载树时将node.id做为参数 通过split("_"),根据数据的长度就可以知道是哪一级的节点 再调用不能的sql 语句 因为每个节点的数据都不在一个表中
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