Scenario: When you update data in a dataset, the changes should also be reflected in the underlying database. What ADO.NET component is responsible for syncing these changes with the database?
- DataAdapter
- SqlCommand
- SqlConnection
- SqlDataReader
The DataAdapter in ADO.NET serves as a bridge between a dataset and a database. It facilitates communication between the dataset and the database by executing SQL commands (such as INSERT, UPDATE, DELETE) and updating the database with changes made to the dataset. Hence, it ensures synchronization of data between the dataset and the underlying database.
In LINQ to SQL, what is the role of the DataContext class in query optimization?
- Caching query results for faster access
- Managing database connections and transactions
- Optimizing the execution plan of generated SQL queries
- Translating LINQ queries into SQL queries
In LINQ to SQL, the DataContext class plays a crucial role in query optimization by translating LINQ queries into SQL queries that are executed against the database. It ensures that LINQ queries are efficiently converted into optimized SQL queries, thereby enhancing performance.
To retrieve different data types from a data reader, you can use the _______ method.
- GetField()
- GetString()
- GetType()
- GetValue()
To retrieve different data types from a data reader, you can use the GetValue() method. This method returns the value of the specified column as an object, which you can then cast to the appropriate data type based on the data stored in the database.
Using a database-specific data provider, such as SqlClient, can result in ___________ performance compared to generic providers.
- Improved
- Deteriorated
- Similar
- Unpredictable
The correct option is Improved. Using a database-specific data provider, like SqlClient for SQL Server databases, often results in improved performance compared to generic providers such as OLEDB. This is because database-specific providers are optimized to leverage the features and capabilities of a particular database system, leading to better efficiency and resource utilization. Generic providers may introduce additional layers of abstraction and overhead, which can impact performance negatively.
To prevent SQL injection attacks, it is recommended to use ________ queries.
- Dynamic
- Embedded
- Parameterized
- Prepared
Parameterized queries are a recommended practice to prevent SQL injection attacks. By using parameters, the values provided by users are treated as data rather than executable code, thereby mitigating the risk of injection attacks.
Scenario: You are developing an application that needs to query a list of customer objects stored in memory. Which LINQ technology would you choose for this task?
- LINQ to Entities
- LINQ to Objects
- LINQ to SQL
- LINQ to XML
LINQ to Objects is the appropriate choice for querying in-memory collections, such as lists of customer objects. It provides powerful querying capabilities against in-memory data structures.
ADO.NET Datasets allow you to work with data in a ___________ manner.
- Connected
- Disconnected
- Persistent
- Semi-Connected
ADO.NET Datasets allow you to work with data in a disconnected manner. This means that after retrieving data from the database, the connection to the database is closed, and the data is held in memory until it is either updated in the dataset or discarded.
When executing a LINQ to Entities query, the ___________ method is used to retrieve the results.
- Execute
- Fetch
- Submit
- ToList
When executing a LINQ to Entities query, the ToList method is used to retrieve the results. It materializes the query and returns the results as a List collection.
When binding data to a list control, which ADO.NET class is commonly used?
- DataSet
- SqlConnection
- SqlDataAdapter
- SqlDataReader
When binding data to a list control, the SqlDataAdapter class is commonly used to fetch and manipulate data from a data source. It serves as a bridge between a data source and a DataSet, allowing you to populate the DataSet with data retrieved from the database. Once data is in the DataSet, it can be easily bound to list controls for display.
Data readers are considered forward-only. What does this mean in the context of ADO.NET?
- They can move both forward and backward through the data.
- They can only access the data in a random order.
- They can only move forward through the data once and cannot move backward.
- They can only read data from the database but cannot update it.
In ADO.NET, a forward-only data reader allows sequential access to the data. Once a record is read, it cannot be revisited, making it efficient for read-only scenarios with large datasets.
Which ADO.NET data reader is used specifically for working with SQL Server databases?
- MySqlDataReader
- OleDbDataReader
- OracleDataReader
- SqlDataReader
The SqlDataReader is specifically designed for working with SQL Server databases in ADO.NET. It provides a forward-only, read-only stream of data from a SQL Server database, allowing efficient retrieval and processing of query results. Unlike other data readers, SqlDataReader is optimized for the SQL Server data provider, providing better performance and functionality when working with SQL Server databases.
What is optimistic concurrency, and how does it relate to modifying data in datasets?
- It locks the database during data modification
- It assumes that no other user will interfere during data modification
- It requires explicit locking of data before modification
- It rolls back changes if conflicts occur during data modification
The correct option is It assumes that no other user will interfere during data modification. Optimistic concurrency is a strategy in ADO.NET where it assumes that no other user will interfere during data modification. It allows multiple users to access and modify the same data simultaneously without locking the database. If conflicting changes occur, it's typically handled during data submission. The other options do not accurately describe optimistic concurrency.