In fact, you might want to bundle up the code you write to handle data source configuration and connection into a utility class (that's left for you as an exercise).

实际上可以将处理数据源配置和连接的代码打包成一个工具类(留给读者作为练习)。

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For example, a utility class function called NVL would return NVL if the database connection is with Oracle, and COALESCE if the DB connection is with DB2.

例如，如果连接的是Oracle数据库，那么名为NVL的实用程序类函数返回nvl；如果连接的是DB2，那么返回COALESCE。

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Oracle: Use the Oracle sqlplus utility to test the connection.

Oracle：使用Oracle sqlplus实用程序来测试连接。

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There's no optimum Maximum Transmission Unit value for all PCs, so this utility tests your connection and selects the MTU that's right for you.

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