Practical Database Programming With Visual Basi... Online

Always use Parameterized Queries . By using placeholders (like @ID ), you ensure the database treats user input as literal data rather than executable code. 3. Choosing the Right Tool: DataReader vs. DataAdapter VB provides two primary ways to handle results:

Always wrap connections in a Using block. This ensures that the connection is properly closed and disposed of, even if an error occurs, preventing "connection leaks" that can crash a server. 2. Executing Commands Safely

Once connected, the application interacts with data using SQL commands (SELECT, INSERT, UPDATE, DELETE). A common pitfall for beginners is string concatenation—building a query like "SELECT * FROM Users WHERE ID = " & userInput . This opens the door to attacks.