我们使用一个实验室计算机系统的签出和保留应用模型的示例，首先编写从数据库访问应用程序数据所需的最简单的代码。

Using a sample checkout and reservation application model for lab computer systems, we start with the most simplistic code required to access application data from the database.

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行标签。这个区域保留担当值标签的字段，并且这个标签出现在值的左侧。

Row Labels. This area holds fields that act as labels for the values, and the labels appear to the left of the values.

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这个区域保留担当值标签的字段，并且这个标签出现在值的左侧。

This area holds fields that act as labels for the values, and the labels appear to the left of the values.

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