Sample Exam - Answer Key

Name:_______________________ Sample Exam Covers Chs 37-38 Multiple Choice Questions Only for This Test Part I: Questions: (1 pts each) 1 Suppose that your program accesses MySQL or Oracle database. Which of the following statements are true? A. If the driver for MySQL and Oracle are not in the classpath, the program will have a runtime error, indicating that the driver class cannot be loaded. B. If the database is not available, the program will have a runtime error, when attempting to create a Connection object. C. If the database is not available, the program will have a syntax error. D. If the driver for MySQL and Oracle are not in the classpath, the program will have a syntax error. 2 Analyze the following code: ResultSet resultSet = statement.executeQuery ("select firstName, mi, lastName from Student where lastName " + " = 'Smith'"); System.out.println(resultSet.getString(1)); A. If the SQL SELECT statement returns no result, resultSet is null. B. resultSet.getString(1) returns the firstName field in the result set. C. resultSet.getString(1) returns the mi field in the result set. D. The program will have a runtime error, because the cursor in resultSet does not point to a row. You must use resultSet.next() to move the cursor to the first row in the result set. Subsequently, resultSet.next() moves the cursor to the next row in the result set. 3 Which of the following statements are true? A. PreparedStatement is a subinterface of Statement B. The parameters in a prepared statement is denoted using the ? sign. C. PreparedStatement is for SQL query statements only. You cannot create a PreparedStatement for SQL update statements. D. PreparedStatement is efficient for repeated executions. 1 4 In a relational data model, ________ provides the means for accessing and manipulating data. A. B. C. D. SQL Language Structure Integrity 5 What information may be obtained from a ResultSetMetaData object? A. number of columns in the result set B. number of rows in the result set C. database URL and product name D. JDBC driver name and version 6 Which of the following statements are true? A. You may load multiple JDBC drivers in a program. B. You may create multiple connections to a database. C. You can send queries and update statements through a Statement object. D. You may create multiple statements from one connection. 7 Which of the following are interfaces? A. B. C. D. DriverManager Connection Statement ResultSet 8 To connect to a local MySQL database named test, use A. Connection connection = DriverManager.getConnection("jdbc:mysql://localhost/test"); B. Connection connection = DriverManager.getConnection("mysql:jdbc://localhost/test"); C. Connection connection = DriverManager.connect("jdbc:mysql://localhost/test"); D. Connection connection = DriverManager.getConnection(jdbc:mysql://localhost/test); 9 To execute a SELECT statement "select * from Address" on a Statement object stmt, use A. B. C. D. stmt.execute("select * from Address"); stmt.query("select * from Address"); stmt.executeQuery("select * from Address"); stmt.executeUpdate("select * from Address"); 10 Database meta data are retrieved through ____________. A. a ResultSet Object 2 B. a PreparedStatement object C. a Connection object D. a Statement object 11 SQL ________ statements may change the contents of a database. A. B. C. D. DELETE UPDATE SELECT INSERT 12 Where is com.mysql.jdbc.Driver located? A. in the standard Java library bundled with JDK B. in a JAR file classes12.jar C. in a JAR file mysqljdbc.jar 13 Result set meta data are retrieved through ____________. A. B. C. D. a a a a PreparedStatement object ResultSet Object Connection object Statement object 14 Which of the following statements loads the JDBC-ODBC driver? A. B. C. D. Class.loadClass("sun.jdbc.odbc.JdbcOdbcDriver") Class.loadClass(sun.jdbc.odbc.JdbcOdbcDriver) Class.forName("sun.jdbc.odbc.JdbcOdbcDriver") Class.forName(sun.jdbc.odbc.JdbcOdbcDriver) 15 ________ are known as intra-relational constraints, meaning that a constraint involves only one relation. A. Domain constraints B. Primary key constraints C. Foreign key constraints 16 ________ is an attribute or a set of attributes that uniquely identifies the relation. A. B. C. D. A A A A key superkey primary key candidate key 17 What is the return value from stmt.executeUpdate("insert into T values (100, 'Smith')") A. an int value indicating how many rows are effected from the invocation 3 B. void C. an object that contains the status of the execution D. a value indicating whether the SQL statement has been executed successfully 18 A database URL for a MySQL database named test on host panda.armstrong.edu is ________. A. B. C. D. jdbc:mysql:/panda.armstrong.edu/test jdbc:mysql://panda.armstrong.edu/test jdbc.mysql.//panda.armstrong.edu/test jdbc.mysql://panda.armstrong.edu/test 19 To create a statement on a Connection object conn, use A. B. C. D. Statement statement Statement statement Statement statement Statement statement 20 In a relational on the data. A. B. C. D. Language Structure SQL Integrity 21 A database URL for an access database source test is ________. A. B. C. D. sun.jdbc:odbc:test test jdbcodbc:test jdbc:odbc:test 22 Invoking Class.forName method may throw ___________. A. B. C. D. = Connection.createStatement(); = conn.createStatement(); = connection.create(); = conn.statement(); data model, _________ imposes constraints ClassNotFoundException RuntimeException SQLException IOException 23 You may create a RowSet using __________. A. B. C. D. E. new new new new new JdbcRowSetImpl() JdbcRowSet() CachedRowSetImpl() CachedRowSet() RowSet() 4 24 You can use a RowSet to __________. A. B. C. D. A. B. C. D. set set set set 25 a a a a database password SQL query statement database URL database username To add the SQL statement "insert into T values (100, 'Smith')" into the batch into a Statement stmt, use stmt.addBatch("insert into T values (100, 'Smith')"); stmt.add("insert into T values (100, 'Smith')"); stmt.add('insert into T values (100, 'Smith')'); stmt.addBatch('insert into T values (100, 'Smith')'); 26 To obtain a scrollable or updateable result set, you must first create a statement using the following syntax: A. Statement statement = connection.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY); B. Statement statement = connection.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE); C. Statement statement = connection.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY); D. Statement statement = connection.createStatement(ResultSet.TYPE_SCROLL_INSENSITIV E, ResultSet.CONCUR_UPDATABLE); 27 In a scrollable and updateable result set, you can use ___________ methods on a result set. A. B. C. D. E. updateRow() first() deleteRow() insertRow() last() 28 RowSet is an extension of _______. A. B. C. D. Statement CLOB ResultSet Connection 29 Invoking executeBatch() returns ________. A. an int value indicating how many SQL statements in the batch have been executed succefully. 5 B. an int value indicating how batch execution. C. a ResultSet D. an array of counts, each of rows affected by the SQL 30 You can store images in A. BLOB B. varchar2 C. CLOB D. varchar many rows are effected by the which counts the number of the command. a database using data type _______. Keys: 1. AB 2. BD 3. ABD 4. AB 5. A 6. ABCD 7. BCD 8. A 9. C 10. C 11. ABD 12. C 13. B 14. C 15. AB 16. B 17. A 18. B 19. B 20. D 21. D 22. A 23. AC 24. ABCD 25. A 26. B 27. ABCDE 28. C 29. D 30. A 6