Basic asp net mvc query with parameter

Introduction

ASP.NET is a popular programming language used for building web applications. One common task in ASP.NET is querying a database with parameters. In this article, we will explore how to a basic ASP.NET MVC query with parameters.

up the Database

we can write the query, we need to set up a database. Let's assume we have a table “Customers” with columns “Id”, “Name”, and “Age”. We will use this table for our example.

Writing the Query

To write a basic ASP.NET MVC query with parameters, we need to follow steps:

Step 1: Create a Connection String

The first step is to create a connection string to connect to the database. This string contains information such as the server name, database name, and authentication details. Here is an example of a connection string:


string connectionString = "Server=myServerAddress;Database=myDatabase;User Id=myUsername;=myPassword;";

Step 2: Create a SQL Query

Next, we need to create a SQL query that includes a parameter. The parameter allows us to pass a value dynamically to the query. Here is an example of a SQL query with a parameter:


string query = "SELECT * FROM Customers WHERE Age > @Age";

Step 3: Create a SqlCommand Object

Now, we need to create a SqlCommand object to the query. We also need to add the parameter to the command object. Here is an example:


SqlCommand command = new SqlCommand(query);
command.Parameters.AddWithValue("@Age", 18);

Step 4: Execute the Query

Finally, we can execute the query and retrieve the results. Here is an example:


using (SqlConnection connection = new SqlConnection(connectionString))
{
    connection.Open();
    command.Connection = connection;
    
    SqlDataReader reader = command.ExecuteReader();
    
    while (reader.Read())
    {
        // Process the results
    }
}

Conclusion

In this article, we have learned how to write a basic ASP.NET MVC query with parameters. By the steps outlined above, you can easily query a database and retrieve the desired results. Remember to always sanitize user to prevent SQL attacks.

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