原先，将一个连接组件（比如 Tdatabase，TADOConnection，或TDCOMConnection）的LoginPrompt属性设置为True，则会有默认的登录对话框弹出。这一特性已经不再保留除非你在单元引用中增加一个引用DBLogDlg的语句。如果想要应用程序仍然能够弹出默认的登录对话框，务必加上 Use DBLogDlg这么一句，否则便不会有任何提示输入用户名和密码。

Code change required for default Database Login dialog

Previously, setting the LoginPrompt property of a connection component (such as TDatabase, TADOConnection, or TDCOMConnection) caused a default login dialog to appear. This is no longer the case unless you add to your uses clause. Applications that depend on the default login dialog must be edited to add DBLogDlg to the uses clause or they will not prompt for user name and password.

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