Is it possible to change the Double column Decimal Size

Question

Is it possible to change the Double column Decimal Size(Number of Decimals) in MS ACCESS using C# with the help of DAO/Query.

As per the MSDN

size : The field size in characters (Text and Binary fields only).

Reference

Size can be used within the ALTER query for Text and Binary fields only.

Answer 1

Sure, DAO can do it:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace DAO_test
{
    class Program
    {
        static void Main(string[] args)
        {
            // required COM reference: Microsoft Office 14.0 Access Database Engine Object Library
            var dbe = new Microsoft.Office.Interop.Access.Dao.DBEngine();
            Microsoft.Office.Interop.Access.Dao.Database db = dbe.Workspaces[0].OpenDatabase(@"C:\__tmp\testData.accdb");
            Microsoft.Office.Interop.Access.Dao.Field fld = db.TableDefs["poiData"].Fields["lon"];
            Console.WriteLine("Properties[\"DecimalPlaces\"].Value was: " + fld.Properties["DecimalPlaces"].Value);
            fld.Properties["DecimalPlaces"].Value = 5;
            Console.WriteLine("Properties[\"DecimalPlaces\"].Value is now: " + fld.Properties["DecimalPlaces"].Value);
            db.Close();
            Console.WriteLine("Hit a key...");
            Console.ReadKey();
        }
    }
}