打开和关闭连接的过程开销较大，会影响到应用程序或数据库的性能，而使用连接池就可以消除大部分这样的开销。
Opening and closing connections is an expensive process affecting application or database performance and the use of connection pooling helps eliminate most of that overhead.
这个过程使用ApacheDerby项目中的Type4JDBC驱动程序连接数据库，从数据库中提取元数据，然后关闭数据库连接。
This process used a Type 4 JDBC driver from the Apache Derby project to connect to a database, extract metadata from the database, and then close the database connection.
这个过程使用ApacheDerby项目中的Type4JDBC驱动程序连接数据库，从数据库中提取元数据，然后关闭数据库连接。
This process used a Type 4 JDBC driver from the Apache Derby project to connect to a database, extract metadata from the database, and then close the database connection.
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