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 (A)</p> Signup and view all the answers

What is a benefit of using JDBC?

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

What is a characteristic of DataDirect JDBC drivers?

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

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

<p>TYPE_SCROLL_SENSITIVE (B)</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 (A)</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 (D)</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 (A)</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 (B)</p> Signup and view all the answers

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

<p>CONCUR_READ_ONLY (C)</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 (B)</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 (B)</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 (A)</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 (D)</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 (D)</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 '/' (D)</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 (C)</p> Signup and view all the answers

Which interface extends the Servlet interface?

<p>JspPage (C)</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 (D)</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 (A)</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 (D)</p> Signup and view all the answers

Which interface provides the _jspService() method?

<p>HttpJspPage (D)</p> Signup and view all the answers

What approach does a Type 3 driver follow for communication?

<p>Three-tier (B)</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 (C)</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 (B)</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 (C)</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 (C)</p> Signup and view all the answers

What is a characteristic of a Type 3 driver?

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

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