Entity Framework allows you to perform ___________ operations on database records.
- CRUD
- Manipulation
- Query
- Retrieve
Entity Framework supports CRUD operations which stand for Create, Read, Update, and Delete. These operations enable developers to interact with database records effectively.
Your Entity Framework application is experiencing performance issues. What are some specific aspects of mapping entities to database tables that you should review to optimize performance?
- Lazy loading and eager loading behavior
- Object-relational mapping conventions
- Query execution plan and indexing strategies
- Relationship fixup and change tracking behavior
When optimizing performance in Entity Framework applications, reviewing query execution plans and indexing strategies is crucial. These aspects directly affect how queries are executed against the database and how efficiently they utilize indexes. By optimizing query execution plans and indexing strategies, you can significantly improve the performance of database operations in your Entity Framework application. This involves analyzing the SQL queries generated by Entity Framework, ensuring appropriate indexing on database tables, and fine-tuning the database engine's execution plan to leverage indexes effectively.
What are the key advantages of using the DataList control for data binding?
- Automatically generates a layout based on the data source structure
- Offers more control over the layout of repeated items
- Provides built-in sorting and filtering capabilities
- Supports multiple templates for item presentation
One of the key advantages of the DataList control is that it supports multiple templates for item presentation. This feature allows you to define different layouts for different types of data items within the same control. For example, you can have separate templates for displaying header, footer, and individual data items, providing flexibility in the presentation.
What is the difference between LINQ to SQL and LINQ to Entities?
- LINQ to Entities supports different data sources including relational databases
- LINQ to Entities uses ObjectContext or DbContext for data manipulation.
- LINQ to SQL is designed for relational databases and maps directly to SQL tables.
- LINQ to SQL uses DataContext for data manipulation.
LINQ to SQL is tightly coupled to SQL Server, whereas LINQ to Entities is more flexible and can work with various data sources beyond SQL Server, such as Oracle, MySQL, etc.
How can you execute a stored procedure in ADO.NET?
- By using the SqlCommand object to create a command with the stored procedure name and then calling ExecuteNonQuery.
- By using the SqlConnection object to establish a connection to the database and then calling ExecuteScalar.
- By using the SqlDataAdapter object to fill a DataSet with the results of the stored procedure execution.
- By using the SqlDataReader object to read the results of the stored procedure execution row by row.
You can execute a stored procedure in ADO.NET by creating a SqlCommand object with the stored procedure name and setting its CommandType property to StoredProcedure. Then, you can add parameters to the command if necessary and execute it using the ExecuteNonQuery method to perform operations that don't return data or ExecuteReader method to retrieve data. The ExecuteScalar method is used when the stored procedure returns a single value. The SqlDataAdapter is used for retrieving data into a DataSet, and SqlDataReader is used for reading data row by row.
What is the significance of the CommandType property in an ADO.NET command object?
- It defines the parameters for the SQL command
- It determines the type of SQL command being executed
- It sets the timeout for the command execution
- It specifies the type of database being accessed
The significance of the CommandType property in an ADO.NET command object is that it determines the type of SQL command being executed. It can be set to CommandType.Text for regular SQL queries or CommandType.StoredProcedure for executing stored procedures.
A common approach to resolving data conflicts in ADO.NET is to implement ___________.
- Data encryption
- Data normalization
- Optimistic concurrency control
- Pessimistic concurrency control
Optimistic concurrency control is a strategy used in ADO.NET to handle data conflicts by assuming that conflicts are rare, thereby improving performance.
Performance optimization in hierarchical data involves techniques like ___________ to reduce data retrieval overhead.
- Aggressive loading
- Deferred loading
- Eager loading
- Lazy loading
In hierarchical data, deferred loading techniques are employed to optimize performance by loading related data only when necessary, minimizing the amount of data retrieved from the database at once.
Scenario: You need to implement a custom conflict resolution strategy in your ADO.NET application. What event should you handle to achieve this?
- RowChanged
- RowChanging
- RowUpdated
- RowUpdating
To implement a custom conflict resolution strategy in an ADO.NET application, you should handle the RowUpdating event. This event occurs before changes are sent to the database during an Update operation. By handling this event, you can examine the changes being made and implement your custom logic to resolve conflicts before they are applied to the database.
In LINQ to DataSet, what is the purpose of the join clause?
- To combine data from two or more data sources based on a related column between them
- To filter data based on a specified condition
- To group data based on a common attribute
- To sort data in ascending or descending order
In LINQ to DataSet, the join clause is used to combine data from two or more data sources based on a related column between them. It allows you to perform operations similar to SQL joins, such as inner joins, outer joins, and cross joins, to retrieve and process data from multiple tables or collections simultaneously. Understanding how to use the join clause effectively is essential for querying and manipulating data using LINQ to DataSet.