You need to make changes to the database schema while keeping the existing data intact. Which feature of Entity Framework Code-First should you use?
- Code Migrations
- Data Annotations
- Database Initializer
- Fluent API
Code Migrations is the feature of Entity Framework Code-First that allows you to make changes to the database schema while preserving the existing data. Code Migrations automatically updates the database schema based on changes made to the C# classes, making it easy to evolve the database schema over time without losing data.
LINQ to SQL is specifically designed for working with ___________ data sources.
- File-based
- NoSQL
- Relational
- Web-based
LINQ to SQL is tailored for working with relational databases. It provides an object-relational mapping (ORM) framework to map database objects to .NET objects, enabling seamless interaction with relational data sources.
The SqlCommand.Parameters collection allows you to define and manage ___________ for your parameterized queries.
- data types
- database connections
- query parameters
- stored procedures
The SqlCommand.Parameters collection in ADO.NET allows developers to define and manage query parameters for parameterized SQL queries. This helps prevent SQL injection attacks by separating SQL code from user input data.
Which ADO.NET class is used to execute SQL queries and stored procedures?
- SqlCommand
- SqlConnection
- SqlDataAdapter
- SqlDataReader
The SqlCommand class is used to execute SQL queries and stored procedures in ADO.NET.
How does a DataAdapter facilitate interaction between a database and a DataSet?
- By automatically synchronizing changes between the database and the DataSet
- By creating a direct connection between the DataSet and the database
- By executing SQL queries directly on the DataSet
- By providing methods to fill a DataSet with data from a database and update the database
A DataAdapter in ADO.NET facilitates interaction between a database and a DataSet by providing methods to fill a DataSet with data from a database using the Fill method, and to update the database with changes made in the DataSet using the Update method.
Scenario: In a high-traffic application, you notice that some database connections remain open indefinitely. How can you ensure proper resource management for these connections?
- Implement a mechanism to close connections after a specified idle time
- Increase the timeout setting for database connections
- Manually close connections after each database operation
- Use connection pooling to automatically manage and recycle connections
Implementing a mechanism to close connections after a specified idle time ensures proper resource management by releasing unused connections back to the pool. This prevents connections from remaining open indefinitely, reducing resource contention and improving overall application performance.
Scenario: You are developing a .NET application that needs to connect to a SQL Server database securely. Which attribute in the connection string would you use to achieve this?
- Integrated Security
- Encrypt
- TrustServerCertificate
- Connection Timeout
The correct option is "Encrypt." By setting the Encrypt attribute to true in the connection string, you can ensure that the data exchanged between the .NET application and the SQL Server database is encrypted, enhancing security. This is crucial for protecting sensitive information during transit. Integrating security through encryption helps in safeguarding the confidentiality and integrity of data.
Deferred execution means that LINQ queries are not executed immediately, but rather, they are executed when the query results are ___________.
- Available
- Fetched
- Enumerated
- Requested
Deferred execution in LINQ means that the query is not executed until the results are requested or enumerated. This allows for more flexibility and optimization in querying large datasets or databases. Thus, the correct option is "Enumerated."
The data reader is connected to the database until you explicitly call the _______ method.
- Close()
- Disconnect()
- Dispose()
- Finish()
The data reader is connected to the database until you explicitly call the Close() method. Calling this method releases the resources associated with the data reader and closes the underlying database connection, preventing unnecessary resource consumption and ensuring proper cleanup.
Which of the following is true about ADO.NET Entity Framework?
- It abstracts the database schema, enabling developers to work with conceptual entities
- It is designed only for desktop applications
- It is tightly coupled with SQL Server
- It supports only stored procedures for data access
ADO.NET Entity Framework abstracts the database schema, allowing developers to interact with conceptual entities rather than dealing directly with database tables and columns. This abstraction simplifies data access and makes the application more maintainable and adaptable to changes in the underlying database structure.