In a transactional context, if one of the PreparedStatement executions fails, what should be the approach for handling this situation?
- Commit the successful executions, ignore the failure
- Continue with the next PreparedStatement
- Manually undo the changes of successful executions
- Rollback the entire transaction
In a transactional context, if one of the PreparedStatement executions fails, the appropriate approach is to rollback the entire transaction to maintain data consistency. Committing successful executions and ignoring the failure may lead to inconsistent data.
How should a developer handle a scenario where a stored procedure returns multiple result sets?
- Close the connection and reopen it
- Ignore additional result sets
- Use multiple ResultSets and process each separately
- Use only the first result set
To handle multiple result sets returned by a stored procedure, the developer should use multiple ResultSets and process each one separately. Ignoring additional result sets or closing and reopening the connection are not appropriate solutions.
A developer needs to insert multiple rows into a database efficiently. Which statement type and technique should they use?
- Batch processing using PreparedStatement
- Individual inserts using Statement
- Stored Procedure with Cursor
- Trigger for each row
Batch processing using a PreparedStatement is an efficient way to insert multiple rows into a database as it reduces the number of database round-trips. It allows the developer to group multiple SQL statements and execute them as a batch.
The CallableStatement method _________ is used to get the result set of a stored procedure.
- executeQuery()
- getCallResult()
- getProcedureResult()
- getResultSet()
The CallableStatement method getResultSet() is used to get the result set of a stored procedure.
Which method in a servlet is used by default to handle GET requests?
- doGet()
- doPost()
- init()
- service()
The doGet() method in a servlet is used by default to handle GET requests.
To improve performance, a PreparedStatement uses _________ to precompile SQL statements.
- compile()
- precompile()
- prepare()
- prepareStatement()
To improve performance, a PreparedStatement uses the prepareStatement() method to precompile SQL statements.
In a CallableStatement, the method _________ is used to execute a SQL function.
- execute()
- executeFunction()
- executeQuery()
- executeUpdate()
In a CallableStatement, the method executeFunction() is used to execute a SQL function.
A PreparedStatement can be optimized by the JDBC driver using __________.
- batch processing
- caching
- connection pooling
- query optimization
A PreparedStatement can be optimized by the JDBC driver using connection pooling, which involves reusing database connections to improve performance.
In what scenarios is CallableStatement preferable over PreparedStatement?
- Executing SQL queries with input parameters
- Handling batch updates
- Handling stored procedure calls
- Optimizing read-only operations
CallableStatement is preferable when dealing with stored procedures as it allows the execution of precompiled SQL queries, making it suitable for scenarios where stored procedures are used.
A transaction in a financial application requires updating multiple accounts. If one update fails, what should happen to ensure data consistency?
- Commit the successful updates
- Ignore the failed update and proceed
- Log the failure and retry the update
- Rollback the entire transaction
In a financial application, to ensure data consistency, it's crucial to rollback the entire transaction if any update within it fails. This helps maintain the integrity of the financial data.
A transaction's property ensuring that either all its operations are completed successfully, or none are, is known as _________.
- Atomicity
- Consistency
- Durability
- Isolation
A transaction's property ensuring that either all its operations are completed successfully, or none are, is known as Atomicity.
The ability of a transaction to operate independently of other transactions is known as __________.
- Atomicity
- Consistency
- Durability
- Isolation
The ability of a transaction to operate independently of other transactions is known as Isolation.