ADO, Adonis, Update Criteria - delphi

Question

On a form, I have a Quantum Grid and some db-aware editcomponents. When appending a new record in the grid, typing some editvalues both in the grid and the separate editcompoennts, I get an error:
EOleException: Row cannot be located for updating. Some values may have been chenged since it was last read
After some googling, I think changing the 'Update Criteria'-property from adCriteriaAllCols to adCriteriaKey may be the right solution. But how, and when, do I do that on a Adonis query?

Answer 1

if your dataset contains an autoincrement field or one or more fields have default values then this may be the problem. After calling Post fields change their value in the db but that may not be detected by your dataset

Answer 2

Although I don't use Adonis, I believe there is a possibility it use the same mechanism TClientDataset (CDS) uses to identify the fields that compose the primary key: the property TField.ProviderFlags.
I believe it could be a good place to start looking.

Answer 3

Actually ADO provides dynamic property to control Query Based Update (QBU) behavior
Most of code is covered in ADOInt.pas, the appropriate event is OnAfterOpen for recordset properties (any TADODataSet), and OnCreate for connection properties (TADOConnection).
I guess ‘Update Criteria’ is not the solution in this case, since it deals with WHERE clause to specify fields to be used for updates.
You may change 'Update Resync' as follows:
//After open a TCustomADODataSet
TCustomADODataSet(DataSet).Properties['Update Resync'].Value :=
adResyncAutoIncrement + adResyncUpdates + adResyncInserts;

Answer 4

if you have join table in your query :
TADOQuery cannot be edit and post data in sql database.
you can create other TADOQuery and select by primary key without any join table and edit and then post data in sql database.

Answer 5

I had a similar problem - Updating a row where all values were the same would result in the error you're getting. I added the flag "Option=2" to the end of my ado connection and this fixed the issue.

Answer 6

This is old. but my situation may happens for someone else. so I post this answer.
This Error happened for me too.
I was using Access database and using some TADOTable on the form.
the relation was master-detail and I connected all of the tables with the IDE Designer together.
my tables were tbl_Floor,tbl_FloorParts,tbl_Seat which tbl_Floor was master of tbl_FloorParts and tbl_FloorParts was master of tbl_Seat.
So for solving this error I did this trick.
procedure Tfrm_Main.UpdateTblFloor(...);
var
FID:Integer;
q:TADOQuery
begin
FID:=tbl_Floor.FieldByName('FID').AsInteger;
tbl_Floor.Close;
q:=TADOQuery.Create(nil);
try
q.Connection:=tbl_Floor.Connection;
q.SQL.Add('Update [Floor]');
q.SQL.Add(...);//Set Fields that needed to be updated
q.SQL.Add('where [FID]='+IntToStr(FID));
q.ExecSQL;
finally
q.free;
end;
tbl_Floor.Open;
tbl_Floor.Locate('FID',FId,[loPartialKey]);
end;
and I added these events for tbl_Floor,tbl_FloorParts
procedure Tfrm_Main.tbl_FloorAfterOpen(DataSet: TDataSet);
begin
tbl_FloorParts.Open;
end;
procedure Tfrm_Main.tbl_FloorBeforeClose(DataSet: TDataSet);
begin
tbl_FloorParts.Close;
end;
procedure Tfrm_Main.tbl_FloorPartsAfterOpen(DataSet: TDataSet);
begin
tbl_Seat.Open;
end;
procedure Tfrm_Main.tbl_FloorPartsBeforeClose(DataSet: TDataSet);
begin
tbl_Seat.Close;
end;