In JDBC, how can you ensure that all resources are freed, even if an SQL exception occurs?
- Close resources in the catch block
- Implement a custom resource management mechanism
- Resources are automatically freed in JDBC
- Use the finally block to close resources
Using the finally block ensures that resources (like connections, statements, result sets) are closed, even if an SQL exception occurs, promoting proper resource management and avoiding leaks.
In JDBC, the __________ exception is thrown when there is a problem with the SQL syntax.
- DBException
- SQLException
- SQLSyntaxException
- SyntaxException
In JDBC, the SQLException is thrown when there is a problem with the SQL syntax.
In a transaction, if a part of the transaction fails, the ________ operation ensures the database reverts back to its previous state.
- COMMIT
- RELEASE
- ROLLBACK
- SAVEPOINT
The ROLLBACK operation ensures that if any part of a transaction fails, the database reverts back to its previous state, maintaining data consistency.
The _________ method is used to retrieve cookies from the request object.
- findCookies()
- getCookies()
- requestCookies()
- retrieveCookies()
The getCookies() method is used to retrieve cookies from the request object in a servlet.
To ensure that database resources are always released, use the __________ block to close connections.
- catch
- finally
- release
- try
To ensure that database resources are always released, use the finally block to close connections.
When handling multiple SQL exceptions in a method, it is common to use __________ to catch various types of exceptions.
- catch-all
- catch-exceptions
- catch-multiple
- multi-catch
When handling multiple SQL exceptions in a method, it is common to use multi-catch to catch various types of exceptions.
A __________ is a subclass of SQLException that indicates a failed connection to the database.
- SQLDataException
- SQLNonTransientConnectionException
- SQLTimeoutException
- SQLTransientConnectionException
The SQLNonTransientConnectionException is a subclass of SQLException specifically indicating a failed connection to the database.
To group multiple SQL commands and execute them as a single transaction, use the __________ feature in JDBC.
- Batch Processing
- Connection Pooling
- Statement Pooling
- Transaction
The Transaction feature in JDBC allows grouping multiple SQL commands into a single transaction for atomicity.
The method __________ is used to get the vendor-specific error code in an SQL exception.
- getErrorCode()
- getMessage()
- getSQLState()
- printStackTrace()
The getErrorCode() method is used to retrieve the vendor-specific error code from an SQL exception in JDBC.
When refactoring a servlet to make it more configurable, what changes are made regarding initialization parameters?
- Introduce new initialization parameters
- Keep the existing parameters unchanged
- Remove all initialization parameters
- Replace parameters with hardcoding
In the process of making a servlet more configurable, one typically introduces new initialization parameters rather than removing or replacing existing ones. This allows for greater flexibility without disrupting existing functionality.