SQLServerCE Problem with parameterized queries from .NET

Question

I am pulling the hair out of my head trying to figure this one out.

I can\'t make Parameterized queries to work in VB.Net, when I am using parameters.

From w

Answer 1

Finally, I have found the solution for this problem.

Using a parameter in a function crashes if the DBType property of the parameter is not set:

This will crash:

    Dim cmd As SqlCeCommand = db.CreateCommand()

    cmd.CommandText = "SELECT COALESCE(@param1, @param2);"
    cmd.Parameters.Add("@param1", 1)
    cmd.Parameters.Add("@param2", "test")
    cmd.ExecuteScalar()

Using a parameter in a function will work if the DBType property of the parameter is set

This will work:

    Dim cmd As SqlCeCommand = db.CreateCommand()

    cmd.CommandText = "SELECT COALESCE(@param1, @param2);"
    cmd.Parameters.Add("@param1", 1).DbType = DbType.Int32
    cmd.Parameters.Add("@param2", "test").DbType = DbType.String
    cmd.ExecuteScalar()