条件表达式中的数据类型不匹配

Question

I am trying to populate a Dataset based on a specific Selection ID but get the error

Data type mismatch in criteria expression.

Not exactly sure why I have this error.

conn = new OleDbConnection(@"Provider=Microsoft.Jet.OleDb.4.0;
                                Data Source =" + Server.MapPath("App_Data\\HarryPothead.mdb"));
        conn.Open();

        DataSet ds = new DataSet();

        OleDbDataAdapter dba = new OleDbDataAdapter("SELECT * FROM [Person] WHERE [StatusIdFrn] = '" + statusID + "'", conn);
        dba.Fill(ds, "PersonName");
        DataTable dt = ds.Tables["PersonName"];

        drpPerson.DataSource = ds.Tables[0];
        drpPerson.DataTextField = "PersonName";
        drpPerson.DataBind();

        conn.Close();

Advice perhaps on how to overcome this.

The databsase I am Selecting from is an Access database and the table I am selecting from three fields, PersonId which is of the type AutoNumber, PersonName which is of the type Text and StatusIdFrn which is of the datatype Number.(drpPerson is a DropDownList control)

Answer 1

Change this:

"SELECT * FROM [Person] WHERE [StatusIdFrn] = '" + statusID + "'"

To this:

"SELECT * FROM [Person] WHERE [StatusIdFrn] = " + statusID + ""

As [StatusIdFrn] is numeric, you need to discard the single quotes as they indicate a text type.