How Can I Securely Update SQL Databases with User Input to Prevent SQL Injection?

How to Safely Update SQL Databases with User Input Using Parameters

When updating SQL databases from user input, it's crucial to prevent SQL injection attacks by using parameters. Let's consider the following VB code:

dbConn = New SqlConnection("server=.\SQLEXPRESS;Integrated Security=SSPI; database=FATP")
dbConn.Open()

MyCommand = New SqlCommand("UPDATE SeansMessage SET Message = '" & TicBoxText.Text & _
                                            "'WHERE Number = 1", dbConn)

MyDataReader = MyCommand.ExecuteReader()
MyDataReader.Close()
dbConn.Close()

If the user input contains special characters like single or double quotes, the code will fail. To address this issue, parameters can be used.

MyCommand = New SqlCommand("UPDATE SeansMessage SET Message = @TicBoxText WHERE Number = 1", dbConn)
MyCommand.Parameters.AddWithValue("@TicBoxText", TicBoxText.Text)

Named parameters (@TicBoxText) are like variables in SQL. The value is supplied in the VB.NET program using AddWithValue. This ensures that the SQL command is self-contained and protected from user input manipulation. After supplying the value, MyDataReader can execute the command safely.

By using parameters, you can prevent SQL injection attacks and maintain the integrity of your database.

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