将信息导出到内部内存、外部内存和本地数据库。

Export information to internal memory, external memory, and the local database.

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服务器不一定非要把此信息导出到数据库；如果不导出，那么只有已经知道服务器绑定的客户机才能连接它。

It is not mandatory for the server to export this info to the database, if not exported only clients that already know the server binding information can connect to it.

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insert() 方法在信息导出到数据库时由 MainActivity 调用（参见 清单 12）。

The insert() method is invoked by MainActivity when exporting information to the database (see Listing 12).

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