What is the process of defining how entities in ADO.NET Entity Framework map to database tables called?
- Database Synchronization
- Entity Framework Design
- Entity Mapping
- Object-Relational Mapping (ORM)
Object-Relational Mapping (ORM)
What is the significance of the "Connection Lifetime" property in connection string settings?
- It defines the minimum time a connection must remain open before being reused, It controls the encryption level used for securing the connection, It specifies the maximum duration a connection can remain idle in the pool before being discarded, It determines the maximum number of connections allowed in the pool
- It determines the maximum number of connections allowed in the pool, It defines the minimum time a connection must remain open before being reused, It controls the encryption level used for securing the connection, It specifies the maximum duration a connection can remain idle in the pool before being discarded
- It determines the maximum number of connections allowed in the pool, It defines the minimum time a connection must remain open before being reused, It specifies the maximum duration a connection can remain idle in the pool before being discarded, It controls the encryption level used for securing the connection
- It specifies the maximum duration a connection can remain idle in the pool before being discarded, It determines the maximum number of connections allowed in the pool, It defines the minimum time a connection must remain open before being reused, It controls the encryption level used for securing the connection
The "Connection Lifetime" property in connection string settings specifies the maximum duration a connection can remain idle in the pool before being discarded, helping to manage resource usage and prevent stale connections.
Data binding in ADO.NET allows you to connect what to a user interface?
- Database records
- SQL queries
- Stored procedures
- User interface controls
Data binding in ADO.NET enables the connection of user interface controls, such as textboxes, labels, and datagrids, to database records. This linkage allows for automatic synchronization of data between the database and the user interface, simplifying data presentation and manipulation tasks within the application.
What is the primary purpose of a DataTable in ADO.NET?
- Represents a connection to the database
- Represents a query to be executed on the database
- Represents a single table of in-memory data
- Stores a collection of records from a database
A DataTable in ADO.NET represents an in-memory representation of a single table from a database. It allows manipulation of data locally without directly interacting with the database. This can be useful for caching data, performing calculations, or preparing data for display.
Scenario: You are designing a data-driven application, and you need to work with multiple related tables. Which ADO.NET feature will help you manage these relationships effectively?
- DataAdapter
- DataReader
- DataRelation
- DataSet
Detailed A DataRelation in ADO.NET helps in managing relationships between multiple related tables effectively. It allows defining parent-child relationships between DataTables, which facilitates operations like navigation, constraint enforcement, and maintaining data integrity. Utilizing DataRelations enables efficient querying and manipulation of data across related tables.
What does LINQ stand for?
- Language Integrated Query
- Linked Interaction Query
- Local Interconnected Query
- Longitudinal Inequality Query
LINQ stands for Language Integrated Query. It is a Microsoft .NET Framework component that adds native data querying capabilities to .NET languages. It allows developers to query different types of data sources in a uniform way.
Scenario: You are building a high-performance application that requires reading a large dataset from a database. How can you efficiently achieve this using a data reader?
- Use SqlDataReader's ExecuteReaderAsync method
- Use SqlDataReader's Forward-Only Cursor
- Use SqlDataReader's Scrollable Cursor
- Use SqlDataReader's UpdateBatchSize property
Utilizing SqlDataReader's Forward-Only Cursor mode provides the most efficient way to read a large dataset from a database. This mode allows for a single-pass read-through of the data, reducing the overhead associated with maintaining a scrollable cursor or performing asynchronous operations. Scrollable cursors, UpdateBatchSize property, and ExecuteReaderAsync method might introduce unnecessary overhead or complexity in scenarios where a simple, efficient read-through is sufficient.
What is the purpose of the SaveChanges method in Entity Framework when updating data?
- It creates a backup of the current state of entity objects in the context before applying any modifications.
- It discards any changes made to entities in the context without affecting the underlying database.
- It persists all pending changes made to entities in the context to the underlying database.
- It retrieves the latest version of data from the database and updates the entity objects in the context.
The SaveChanges method in Entity Framework is used to persist all pending changes made to entity objects in the context to the underlying database. This includes inserting new records, updating existing ones, and deleting entities as necessary. By calling SaveChanges, the framework ensures that any modifications made within the context are correctly synchronized with the database, maintaining data consistency. This method is essential when updating data as it commits the changes made by the application, making them permanent in the database.
When working with LINQ to Entities, the "Include" method is used to specify ___________ properties to be eagerly loaded.
- Associated
- Joined
- Navigation
- Related
In LINQ to Entities, the "Include" method is used to specify navigation properties to be eagerly loaded. Navigation properties are properties on an entity that allow you to navigate to related entities.
LINQ allows developers to query and manipulate which types of data sources?
- Arrays
- Collections
- Databases
- XML
LINQ (Language Integrated Query) enables developers to query and manipulate collections, databases, XML documents, and any data source that can be queried with LINQ. It's a versatile tool for working with different types of data sources, making it easier to write expressive and powerful queries in C# and other .NET languages.