选择数据库池示例的条目，并展开所有的树节点。

Select the entry for the database pool example and expand all the tree nodes.

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对于较大的树型数据集，您可能只想加载可见树节点的必要数据，当用户展开一个节点后再记载该节点的子节点。

For large tree data sets you probably want to only load the necessary data for the visible nodes of the tree. When a user expands a node, it starts to load the children of that node.

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如果树节点是可展开的，则将会获得“expanded”状态。

If the tree node is expandable, it will get the state of expanded.

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如果树节点是可展开的，则将会获得“expanded”状态。

If the tree node is expandable, it will get the state of expanded.

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