What is the primary purpose of using parameterized queries in ADO.NET?
- To automatically generate SQL queries
- To encrypt query parameters
- To improve query performance
- To prevent SQL injection attacks
Parameterized queries in ADO.NET help prevent SQL injection attacks by separating SQL code from user input. This reduces the risk of malicious SQL code being injected into the query, enhancing the security of the application.
What is the primary purpose of data binding in WinForms applications?
- To handle user input events
- To improve the visual appearance of controls
- To manage application resources
- To synchronize data between controls and data sources
Data binding in WinForms applications allows for the synchronization of data between controls and data sources, ensuring that changes in one are reflected in the other. This simplifies the development process and enhances the maintainability of the application.
When using LINQ to SQL, what is the role of the EntitySet class?
- Represents a collection of entities in a LINQ to SQL data model
- Represents a database table in LINQ to SQL
- Represents a query expression in LINQ to SQL
- Represents an individual entity in LINQ to SQL
In LINQ to SQL, the EntitySet class represents a collection of entities in a LINQ to SQL data model. It provides functionality for querying and manipulating collections of entities.
Which LINQ to SQL method is used to update existing records in a database table?
- ModifyChanges()
- SaveChanges()
- SubmitChanges()
- UpdateChanges()
The SubmitChanges() method in LINQ to SQL is used to update existing records in a database table. This method submits all changes made in the DataContext to the underlying database. It tracks changes made to entities and generates appropriate SQL commands to update records, ensuring data integrity and consistency.
Which method is used to open a database connection in ADO.NET?
- Begin()
- Connect()
- Open()
- Start()
The method used to open a database connection in ADO.NET is Open(). Calling this method establishes a connection to the database specified by the connection string associated with the connection object.
In Entity Framework, what is the primary purpose of an Entity?
- Defining the structure of the database
- Modeling business entities
- Performing database operations
- Representing a table in the database
In Entity Framework, an Entity primarily represents a business object or concept, such as a customer or an order. It models the data that the application works with and typically corresponds to a table in the database. Entities in EF are used to perform CRUD (Create, Read, Update, Delete) operations on the underlying data.
Which LINQ to SQL operation is used to delete records from a database table?
- DeleteOnSubmit
- InsertOnSubmit
- RemoveOnSubmit
- UpdateOnSubmit
In LINQ to SQL, the operation used to delete records from a database table is DeleteOnSubmit. Similar to insertion and updating, deletion operations are also performed within a DataContext instance. This method queues up objects for deletion, and upon calling SubmitChanges(), the changes are applied to the underlying database. Understanding how to delete records is crucial for maintaining data integrity and managing database content effectively in LINQ to SQL applications.
When resolving a merge conflict in Git, what approach would you take to ensure the integrity of the codebase?
- Choose one side's changes without review
- Merge conflicting changes manually
- Discard conflicting changes
- Always accept remote changes
The correct option is b) Merge conflicting changes manually. This approach involves carefully reviewing and selecting the changes from both sides to create a resolution that maintains code integrity. Options a, c, and d may lead to loss of important code or introduce errors.
In a situation where data normalization is causing performance issues, what SQL technique could be used to balance normalization with query efficiency?
- Denormalization
- Indexing
- Partitioning
- Subquery
In situations where data normalization impacts performance, denormalization can be used. Denormalization involves introducing redundancy into the database by storing redundant data, which can reduce the need for complex joins and improve query efficiency. It's a trade-off between normalization and performance.
In financial time series data of a stock market, what type of model would be ideal for predicting future stock prices considering past trends and volatilities?
- Autoregressive Integrated Moving Average (ARIMA)
- GARCH (Generalized Autoregressive Conditional Heteroskedasticity)
- Long Short-Term Memory (LSTM) Networks
- Random Forest Regressor
GARCH models are well-suited for financial time series data as they account for volatility clustering and changing variances over time. ARIMA and LSTM are more focused on capturing patterns in the mean, while Random Forest is generally not used for time series forecasting in financial markets.