JDBC 2.1 Test answers 2016.

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Question:* Under which category does the following driver fall: WebLogic's Tengah "all Java Type-3 driver"

Answer: • Net-Protocol All-Java Driver

Question:* Which JDBC driver is considered best in terms of performance and efficiency?

Answer: • Type-1 Driver

Question:* Please select all the correct options. JDBC Driver Manager is:

Answer: • Able to activate registered drivers

Question:* Consider the following statement: PreparedStatement ps=con.prepareStatement("INSERT INTO ORDER (CUSTOMER_ID ,PRICE) VALUES(?,?)"); Which of the following should come after this statement?

Answer: • ps.clearParameters(); ps.setInt(1,3); ps.setDouble(2,790.50); ps.executeUpdate();

Question:* You want to start a transaction for bank account processing. Which of the following methods will you execute on the Connection object to begin it?

Answer: • con.setAutoCommit(false);

Question:* You need to use a third party driver for establishing a connection with the database. The subprotocol is "webx" and the DSN is "webdsn". What is the syntax of the URL?

Answer: • jdbc:webx:webdsn

Question:* You have to handle an erroneous situation in a transaction. Which method comes handy in this case?

Answer: • con.rollback();

Question:* How will you create a new instance of a JDBC driver explicitly?

Answer: • Class.forName("driver").newInstance();

Question:* JDBC is based on:

Answer: • X/Open CLI (Call Level Interface)

Question:* You are developing a shopping cart for your client. Where would you like to put your business logic?

Answer: • In middleware servlets

Question:* You want to execute the following query string, using the connection named "con": String query = "SELECT * FROM CUSTOMER"; What should the syntax be?

Answer: • Statement stmt=con.createStatement(); ResultSet rs=stmt.executeQuery(query);

Question:* Which exception will be thrown in your code, if the specified driver could not be loaded?

Answer: • ClassNotFoundException

Question:* A process allows you to group multiple SQL statements. Commit or Rollback can be performed on the group together. This process is known as:

Answer: • Transaction

Question:* Which of the following JDBC methods is used for retrieving large text strings?

Answer: • getAsciiStream

Question:* Open Database Connectivity is:

Answer: • Platform independent

Question:* Which of the following methods eliminates the need to call wasNull() method to handle null database fields?

Answer: • getObject();

Question:* Transactions have a property called atomicity, which means:

Answer: • Everything takes place once

Question:* What should the syntax be to establish a connection with a Database?

Answer: • Connection con = DriverManager.getConnection(url,"myLogin", "myPassword");

Question:* ResultSet objects follow index patterns of:

Answer: • Array standard

Question:* When you are handling user-submitted SQL, you may retrieve a ResultSet or a count. Which of the following methods is handy in this situation?

Answer: • execute()

Question:* You want to execute a CallableStatement named 'cs'. It is expected to return multiples results. Which of the following methods will you choose?

Answer: • ResultSet rs=cs.execute()

Question:* Your project leader has asked you to improve the performance of JDBC connectivity by reusing objects in your Servlet's code. Which of the following is an appropriate solution?

Answer: • Reuse the database connection and use PreparedStatement objects with synchronized blocks

Question:* Which of the following methods will you use to execute INSERT, UPDATE and DELETE SQL statements?

Answer: • executeUpdate();

Question:* How do you register a JDBC driver?

Answer: • Class.forName("driver");

Question:* Which of the following JDBC methods is used for retrieving large binary objects?

Answer: • getBinaryStream

Question:* Name the interface you will use to retrieve the underlying structure of the query result:

Answer: • ResultSetMetaData

Question:* Which type of statement object will you use to execute a stored procedure?

Answer: • CallableStatement

Question:* A warning can be thrown by a Connection object, a Statement object or a ResultSet object. Which method is used to retrieve the warning:

Answer: • getWarnings()

Question:* You have obtained a ResultSet object named 'rs' after executing the following query: SELECT * FROM CUSTOMER Which loop can you use to return all the records in the ResultSet?

Answer: • while(rs.next())

Question:* You executed a query to retrieve 40 products from the database and obtained a scrollable ResultSet named 'scrollrs'. You started scrolling the ResultSet as follows: scrollrs.next(); scrollrs.absolute(-10); scrollrs.relative(-6); At which row number is the cursor currently located?

Answer: • 24

Question:* The code segment below defines a query: String qry="SELECT CUS_NAME, PRICE FROM CUSTOMER"; Which of the following code snippets will create a scrollable ResultSet?

Answer: • Statement st=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY); ResultSet srs=st.executeQuery(qry);

Question:* Which of the following is the syntax for creating a CallableStatement?

Answer: • CallableStatement cs=con.prepareCall("{call SHOW_ORDER}")

Question:* Which of the following is not true?

Answer: • CallableStatement cannot take INOUT parameters

Question:* Which of the following is not true for a ResultSet?

Answer: • Methods next() and previous() return -1 beyond the ResultSet

Question:* Java Database Connectivity (JDBC) is a:

Answer: • Database-independent API

Question:* Servlet developers should avoid using JDBC-ODBC bridge driver because:

Answer: • The driver is of Type-1

Question:* You have obtained a scrollable ResultSet named 'srs' by executing a query. Which of the following methods will you use to verify the position of the cursor?

Answer: • srs.getRow()

Question:* A user leaves an online shopping cart without checking out. Which of following interfaces will notify to Rollback the transaction?

Answer: • HttpSessionBindingListener

Question:* After executing the following code, resultvar contains false. What should the next step be? boolean resultvar=stmt.execute(sql);

Answer: • stmt.getUpdateCount();

Question:* SQLException has a method, which provides the feature of chaining or encapsulation of additional Exception objects. Identify the method from the following:

Answer: • getNextException()

Question:* Your project leader has given you a new task. You have to work on a module in which the transaction has to be extended across multiple page requests and multiple servlets. How will you implement this?

Answer: • By session tracking and using HttpSession to hold a connection for each user

Question:* SQLWarning object deals with database access warnings. It is a subclass of:

Answer: • SQLException

Question:* Will the below script execute properly? 1.CREATE TABLE CUSTOMER 2.( 3.CUS_NAME VARCHAR(32), SUP_ID INTEGER, PRICE FLOAT, SALES INTEGER 4.)

Answer: • Yes. The table will be created successfully.

Question:* You are trying to connect to a database through JDBC. There is a problem with one of the methods immediately after the driver has been loaded. Which exception will be thrown?