海颐软件面试题.doc

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海颐软件面试题
英文翻译
class is a programmatic description of entities，also know as objects. If we when have to deal with is a well-defined interface, consisting of methods and properties.
3. Cookies are name-value pairs that can be sent by a web server and stored on the client's machine. The cookie is associated with the URL of the server, so that only the web site that \"dropped\" the cookie can retrieve it from the user's hard drive once it has been stored there.
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Cookies are a way for web servers to store information about the user who visited their sit and save state information.
One of the most important properties of the Cookie object is the Expires property. Setting the Expires property to a data in the past will cause the Cookie, dropped by your server application, to expire the moment the Browser (client) is no longer communication with your application. ()
4. Creates a unique index (one in which no two rows are permitted to have the same index value) on a table. Microsoft SQL Sever 2000 checks for duplicate values when the index is created (if data already exists) and checks each time data is added with an INSERT or UPDATE statement. Duplicates must be eliminated before a unique index can be created on the column(s).If duplicate key values exist, the CREATE INDEX statement is canceled and an error is returned. A