Question

TAdoTable Insert

Asked by: Almatrodi

Hi

I have an application with Delphi 2010 that has one form with many dbedit controls coming from MS Access.

I need to insert a new record that insert some of fields. And, this what I've done:

1 - I created some variables and read the current values from dbedit controls, because I want to insert the same values of current record with change in the key.
2 - I issued a Insert method as MyAdoTable.Insert
3 - I assinged the values with variables that I got from step 1
4- I isseud a Post method

As:
  dmCompanyTenderApp.adotTenderItem.Insert;
  dmCompanyTenderApp.adotTenderItem.Edit;
  dmCompanyTenderApp.adotTenderItem.FieldByName('TenderItemSerial').AsInteger  := intTenderItemSerial;
  dmCompanyTenderApp.adotTenderItem.FieldByName('CompanyItemOfferNo').AsInteger := intNewOfferID;
  dmCompanyTenderApp.adotTenderItem.FieldByName('UnitID').AsInteger := intUnitID;
  dmCompanyTenderApp.adotTenderItem.Post;


But, when I run it I got:
Project xxx raised exception class EDatabaseError with message 'Field 'TenderItemSerial' cannot be modified'

I tried Append also. The same error occurred.

Please help me what is the wrong?

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Asked On
2009-11-04 at 05:59:17ID24870807
Tags

TAdoTable

Topic

Delphi Programming

Participating Experts
2
Points
500
Comments
3

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Answers

 

by: senadPosted on 2009-11-04 at 06:13:32ID: 25739428

when you have thing like that the best way is to use parameters something like :
INSERT INTO MYTABLE VALUES (a1,a2,a3);
query.parameters.parambyname('a1').value := dbedit1.text
etc...

 

by: epasquierPosted on 2009-11-04 at 06:27:27ID: 25739548

1) you don't have to call Edit after Insert
2) maybe your field TenderItemSerial is read-only (autoInc for example). Tell us more about your table structure
3) do you know With .. do instructions ? it helps a lot to write/read code 

With dmCompanyTenderApp.adotTenderItem do
 begin
  Insert;
  FieldByName('TenderItemSerial').AsInteger := intTenderItemSerial;
  FieldByName('CompanyItemOfferNo').AsInteger := intNewOfferID;
  FieldByName('UnitID').AsInteger := intUnitID;
  Post;
 end; 

                                              
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by: epasquierPosted on 2009-11-04 at 06:33:35ID: 25739627

And do you know that delphi can create for you components to access quickly some fields of a dataset ?
right click on your adotTenderItem in your datamodule design form, select "field editor..." it will show you a list of fields managed this way. right-clik in this view and select add all fields.
Now, in your code , you can access all your fields directly, without having to look for them by name.
Of course, the names automatically generated can be long/clumsy, but you can rename them if you want.

That is the standard way of handling DB operations simply & efficiently in Delphi 

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With dmCompanyTenderApp do
 begin
  adotTenderItem.Insert;
  adotTenderItemTenderItemSerial.AsInteger := intTenderItemSerial;
  adotTenderItemCompanyItemOfferNo.AsInteger := intNewOfferID;
  adotTenderItemUnitID.AsInteger := intUnitID;
  adotTenderItem.Post;
 end; 

                                              
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