Java Beans and JDBC MCQs Questions

21

What is the purpose of the JDBC `Batch` processing feature?

A) To manage JavaBean lifecycle B) To create JavaBean properties C) To execute multiple SQL statements as a batch D) To establish database connections

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Answer & Solution

Answer: Option C

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22

Which SQL statement is used to insert data into a database table in JDBC?

A) `DELETE FROM` B) `INSERT INTO` C) `SELECT` D) None of These

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Answer & Solution

Answer: Option B

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23

In JDBC, what is the primary purpose of the `Driver` interface?

A) To create JavaBeans B) To execute SQL queries C) To define the contract for database drivers D) To define JavaBean properties

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Answer & Solution

Answer: Option C

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24

Which of the following is NOT a valid method to execute an SQL query in JDBC?

A) `executeUpdate()` B) `execute()` C) `executeBatch()` D) `executeQuery()`

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Answer & Solution

Answer: Option C

Solution:

executeUpdate(): This method is used to execute SQL statements that update the database, such as INSERT, UPDATE, or DELETE statements. It returns an integer representing the number of rows affected by the query.

execute(): This method can be used to execute any SQL statement, and it returns a boolean. The returned value is true if the result is a ResultSet object; otherwise, it returns false.

executeBatch(): This method is used to execute a batch of SQL statements. It sends multiple SQL statements to the database for execution as a batch and returns an array of update counts. It is not used to execute a single SQL query.

executeQuery(): This method is used to execute SQL queries that retrieve data from the database, such as SELECT statements. It returns a ResultSet object containing the data produced by the query.

Therefore, executeBatch() is not a valid method to execute a single SQL query in JDBC.

25

In JDBC, what is the purpose of the `java.sql.SQLException` class?

A) To handle database-related exceptions B) To manage JavaBean properties C) To execute SQL queries D) To create JavaBeans

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Answer & Solution

Answer: Option A

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26

What is the primary role of the JDBC `ConnectionPoolDataSource` interface?

A) To execute SQL queries B) To manage JavaBean events C) To define JavaBean properties D) To provide a connection pool for JDBC

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Answer & Solution

Answer: Option D

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27

Which of the following is a valid way to handle exceptions in JDBC?

A) Using JavaBeans to handle exceptions B) Using `throws` statements in SQL queries C) Using try-catch blocks to catch `SQLException` D) Using `break` statements in SQL queries

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Answer & Solution

Answer: Option C

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28

What is the primary purpose of the JDBC `RowSet` interface?

A) To manage JavaBean lifecycle B) To represent a set of rows from a database C) To execute SQL queries D) None of These

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Answer & Solution

Answer: Option B

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29

In JDBC, what is the purpose of the `java.sql.SQLWarning` class?

A) To create JavaBeans B) To execute SQL queries C) To provide warnings about database operations D) To define JavaBean properties

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Answer & Solution

Answer: Option C

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30

Which of the following is a valid method to retrieve data from a JDBC `ResultSet`?

A) `setInt(String columnName)` B) `updateRow(int rowIndex)` C) `executeQuery()` D) `getString(int columnIndex)`

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Answer & Solution

Answer: Option D

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Java Beans and JDBC MCQs Questions | Java Program MCQs