在一个生产实现中，可以使用该方法来创建数据库连接池的间隔。
In a production implementation, you would use this method to create the internals of a database connection pool.
清单4显示了在应用程序模块中查找创建的数据库连接池所需的代码。
Listing 4 shows the code in the application module needed to lookup the created database connection pool.
接下来将为新创建的数据库创建连接池
Next you create a connection pool for the recently created database
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