JDBC Architecture and Communication
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Questions and Answers

What is a characteristic of drivers in databases?

  • They use SQL protocols
  • They are independent of the database vendor
  • They are database specific (correct)
  • They use standard network protocols

    • What type of driver permits modern data-driven Java applications?

  • Type 4 driver
  • Type 2 driver
  • Type 5 driver (correct)
  • Type 3 driver

    • What does the JDBC API standardize?

  • How to connect to a database (correct)
  • The SQL sent to the database
  • How to call stored procedures
  • The database vendor

    • What is a limitation of JDBC?

    <p>It does not standardize the SQL sent to the database</p> Signup and view all the answers

    What is a benefit of using JDBC?

    <p>It makes changing to another database a lot easier</p> Signup and view all the answers

    What is a characteristic of DataDirect JDBC drivers?

    <p>They are compliant with Type 4 architecture</p> Signup and view all the answers

    What type of ResultSet object is sensitive to changes to the underlying data?

    <p>TYPE_SCROLL_SENSITIVE</p> Signup and view all the answers

    What is the purpose of CONCUR_UPDATABLE in a ResultSet object?

    <p>To allow the ResultSet to be updated</p> Signup and view all the answers

    Which type of ResultSet object can move the cursor to an absolute position or relative to the current cursor position?

    <p>TYPE_SCROLL_INSENSITIVE</p> Signup and view all the answers

    What does the TYPE_FORWARD_ONLY constant indicate in a ResultSet object?

    <p>The cursor can move only forward</p> Signup and view all the answers

    What is the purpose of Getter methods in a ResultSet object?

    <p>To retrieve column values from the current row</p> Signup and view all the answers

    What constant indicates that a ResultSet object may NOT be updated?

    <p>CONCUR_READ_ONLY</p> Signup and view all the answers

    What is the purpose of the web.xml file in a web application?

    <p>To configure various aspects of the web application</p> Signup and view all the answers

    What is the purpose of the servlet tag in the web.xml file?

    <p>To register a servlet with the container</p> Signup and view all the answers

    What is the purpose of the public URL name of a servlet?

    <p>To allow the client to access the servlet service</p> Signup and view all the answers

    What happens if a client requests a servlet using its registration name or servlet class name?

    <p>The container doesn't execute the servlet</p> Signup and view all the answers

    What is the purpose of the registration name in a servlet tag?

    <p>To define a user-defined name for the servlet</p> Signup and view all the answers

    What is the format of the public URL name of a servlet?

    <p>A user-defined name preceding with '/'</p> Signup and view all the answers

    What is the purpose of the jspInit() method in the JspPage interface?

    <p>To perform initialization during the life cycle of the JSP</p> Signup and view all the answers

    Which interface extends the Servlet interface?

    <p>JspPage</p> Signup and view all the answers

    What is the significance of the underscore in the _jspService() method?

    <p>It signifies that the method cannot be overridden</p> Signup and view all the answers

    What is the purpose of JSP tags in a JSP program?

    <p>To define Java code that is executed before sending the output to the browser</p> Signup and view all the answers

    What is the purpose of the jspDestroy() method in the JspPage interface?

    <p>To perform some clean up operations before the JSP page is destroyed</p> Signup and view all the answers

    Which interface provides the _jspService() method?

    <p>HttpJspPage</p> Signup and view all the answers

    What approach does a Type 3 driver follow for communication?

    <p>Three-tier</p> Signup and view all the answers

    What is the advantage of the middleware server in a Type 3 driver?

    <p>It provides typical middleware services</p> Signup and view all the answers

    What is a benefit of the client driver to middleware communication in a Type 3 driver?

    <p>It is database-independent</p> Signup and view all the answers

    What is a disadvantage of the Type 3 driver?

    <p>It requires database-specific coding to be done in the middle tier</p> Signup and view all the answers

    What is the significance of a middleware server in a Type 3 driver?

    <p>It can provide caching and load balancing</p> Signup and view all the answers

    What is a characteristic of a Type 3 driver?

    <p>A single driver can handle any database</p> Signup and view all the answers

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