In standard JDBC code without auto-commit, the application USES a connection to access and update data, then commits the connection to end the transaction (and start another).
在没有自动提交的标准JDBC代码中，应用程序使用一个连接来访问和更新数据，然后提交该连接以结束这个事务(并启动另一个事务)。
A good one to start with is the Flickr API because it offers lots of data without the need to authenticate with it.
Flickr API是一个好的起点，因为它提供大量数据，但不需要身份验证。
Researchers usually start their investigation by examining secondary data to see whether their problem can be partly or wholly solved without collecting costly primary data.
调研人员开始调查时总是先收集次级资料以判断问题是否部分或全部解决了，而不是先去收集成本很高的初级资料。
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