Particularly, the system is made of 4-tier architecture, which makes the system have better flexibility, architecture and expansibility.

特别是采用了四层体系结构来构建系统，使其具有良好的柔性、可重构性和可扩展性。

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The system adopts a 4-tier architecture, including representation layer, business facade layer, business rules layer, and data access layer.

系统采用了表示层、业务外观层、业务规则层、数据层的四层体系结构。

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Particularly, the 4-tier architecture is introduced based on the. NET framework, which makes the system have better flexibility and expansibility.

NET架构构建了系统四层体系结构，使其具有良好的柔性、可重构性和可扩展性。

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Note: you can use a DB2 connect gateway to provide a stable middle tier and utilize features such as connection pooling and failover to your architecture and still use DB2 type 4 Drivers.

请注意：可以使用DB 2Connect网关来提供稳定的中间层，以及在体系结构中利用连接池和故障转移(failover)等功能，并且仍然使用DB 2Type4驱动程序。

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Note: you can use a DB2 connect gateway to provide a stable middle tier and utilize features such as connection pooling and failover to your architecture and still use DB2 type 4 Drivers.

请注意：可以使用DB 2Connect网关来提供稳定的中间层，以及在体系结构中利用连接池和故障转移(failover)等功能，并且仍然使用DB 2Type4驱动程序。

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