What is the main purpose of using try-catch blocks in database operations?
- To close connections
- To create databases
- To execute SQL queries
- To handle exceptions
The main purpose of using try-catch blocks in database operations is to handle exceptions that may occur during the execution of SQL queries or other database-related operations.
The translation of JSP to servlet occurs in the ______ phase.
- Compiling
- Execution
- Initialization
- Parsing
The translation of JSP to servlet occurs in the compiling phase. JSP pages are translated to servlets before they are compiled into bytecode and executed on the server.
In JDBC, what does Statement.setFetchSize(int rows) method influence?
- Database table indexing
- Number of rows fetched at a time
- Query execution timeout
- Transaction isolation level
The setFetchSize(int rows) method in JDBC influences the number of rows fetched at a time from the result set, which can impact the performance and memory usage of the application.
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.