The <connection> element contains a named database connection.
<connection>元素嵌套了一个指定的数据库连接.

Note: No connection string is defined in the AppML description. The connection string (with username and password) is defined once in the AppML Web Service (and will not be visible for the users).
注意：在AppML描述中并没有定义连接字符串。连接字符串（包含用户名和密码）是一次性定义在AppML网络服务中的（用户不能够看到它）。

Example
案例

<?xml version="1.0" ?>

<appml>

<database>
<connection>northwind</connection> <sql>SELECT CompanyName,ContactName,City FROM Customers</sql> </database>

....
....

</appml>

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