一旦激活，通过应用程序角色获取的权限在连接期间保持有效。
Once activated, permissions acquired through the application role remain in effect for the duration of the connection.
在执行时，当建立数据库连接时，确定用户应用程序代码页，而且它只在连接期间有效。
At execution time, the user application code page is established when a database connection is made, and it is in effect for the duration of the connection.
第一次连接到服务器时，将在数据库连接和可信上下文之间建立关系，这种关系将在连接期间一直维持。
The relationship between a database connection and a trusted context is established when the connection to the server is first made and that relationship remains for the life of that connection.
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