Two interview demo

Some notes on session tracing technology

Cookie yes Web A small piece of information sent by the server to the client , When requested by the client , You can read this information and send it to the server

Closing the browser means a temporary session ID The loss of , but All session data associated with the original session remains on the server , Until the session expires

Disabled at Cookie You can use URL Rewriting technology tracks sessions

In the use of JDBC perform SQL Statement two ways to create an object for execution

Statement sta=con.createStatement();
ResultSet rst=sta.executeQuery("select * from book");

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PreparedStatement pst=con.prepareStatement("select * from book");
ResultSet rst=pst.executeQuery();