I am trying to save a long integer value to an Oracle field. I have created a field of long integer type using ArcCatalog in a standalone table. The below code breaks at row.set_Value(idx, val) . Error message is:

"The value type is incompatible with the field type.[EMP_ID]"

It looked such a trivial problem but now I am stuck. Any ideas how to resolve this?

IMxDocument doc = ArcMap.Application.Document as IMxDocument;
IMap map = doc.FocusMap;
IFeatureLayer layer = map.get_Layer(0) as IFeatureLayer;
IFeatureClass fc = layer.FeatureClass;
IWorkspace ws = (fc as IDataset).Workspace;

IFeatureWorkspace fws = ws as IFeatureWorkspace;
ITable tbl = fws.OpenTable("TestTable");
int idx = tbl.FindField("EMP_ID");
IRow row = tbl.CreateRow();
long val = 123412341234;
row.set_Value(idx, val);
  • Please Edit the question to contain the DESCRIBE tablename output from SQL*Plus.
    – Vince
    Aug 31, 2017 at 10:16
  • Note that "long" might be an 8-byte long long with some compiler switches, but int isn't likely to be anything other than a 4-byte type.
    – Vince
    Aug 31, 2017 at 12:02

1 Answer 1


Long is not that long according to ESRI. They say it translates to number(10), while you need a number(12) or more. The workaround is to create a double(12,0) column in ArcCatalog, with a scale of 0 (no decimals). You can read it as .net long in your code. This doc is also useful.

From experience, I have found default values chosen by ESRI to be sub-optimal.

  • yes JGH, long is not long enough for ESRI.
    – vinayan
    Sep 12, 2017 at 6:50

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