Why Does My Parameterized Query Throw a 'Parameter Missing' Error?

Parameter Missing in Parameterized Query

The error message "The parameterized query expects the parameter which was not supplied" occurs when a parameterized query is executed without all the necessary parameters being provided.

In the provided code, the SQL query includes a parameter @Parameter1:

SELECT * FROM borrow where (Department LIKE '%@Parameter1%')"

However, the code does not explicitly set the value for this parameter.

To resolve the issue, the code should include the following lines to set the parameter value before executing the query:

cmd.Parameters.Add("@Department", SqlDbType.VarChar)

If (TextBox2.Text = Nothing) Then
    cmd.Parameters("@Department").Value = DBNull.Value
Else
    cmd.Parameters("@Department").Value = TextBox2.Text
End If

By checking for null values and setting them to DBNull.Value, the code ensures that the query is executed with the appropriate parameter values, resolving the error.

The above is the detailed content of Why Does My Parameterized Query Throw a 'Parameter Missing' Error?. For more information, please follow other related articles on the PHP Chinese website!