Question

Delphi ADO Dataset

Asked by: tirbanqs

Hi guys,

How do I get the newly added records primary key when inserting a record?
I am using TBetterADODataset with LockType ltBatchOptimistic since I wanted to post the records to the db as a batch.

My problem is when I insert a record and get the primary key since the primary key is inserted into the detail table. (Master - Detail table approach)

Thanks in advance.

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Asked On
2009-08-30 at 04:41:35ID24692971
Tags

Delphi

Topic

Delphi Database

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Answers

 

by: tirbanqsPosted on 2009-08-30 at 09:06:17ID: 25218110

//Further explanation
Master table: Root_Node
Fields: id, description

Detail table: Child_Node
Fields: id, root_id, description  {root_id is from the table Root_Node}

... when creating a root node, i need to get the id because i will be needing it when creating a child node.
On a batch mode, after inserting a new record, the id is 0. This is where my problem is since i need the id for the child node table.

 

by: ozen_akyurekPosted on 2009-08-30 at 13:03:28ID: 25219052

You need to refresh the root_node to get the id.

How do you insert
1- As a batch, do you first insert root_node rows and then child_nodes
OR
2- Insert one root_node, insert child nodes of the root and then the next root_node.

If 1 then refreshing root will solve your problem and ADO Dataset will re-read the id after inserting
If 2 then I could recommend some DB procedure etc. to get the root_id and then insert this root_id to your root record. Refreshing will still solve the problem but it may be slow.

Which database are you using?

 

by: tirbanqsPosted on 2009-08-30 at 17:51:33ID: 25220057

You are correct. Refreshing would be slow and will probably not use it.

When inserting a root_node, i will also insert a child_node.
Basically, in one transaction, there will be 2 records inserted.
I am using SQL Server for the db.

adodatasetroot_node.insert;
adodatasetroot_node.fieldbyname('description').asstring := 'Letters';
adodatasetroot_node.post;
 
adodatasetchild_node.insert;
adodatasetchild_node.fieldbyname('root_id').asinteger := adodatasetroot_node.fieldbyname('id').asinteger;
adodatasetchild_node.fieldbyname('description').asstring := 'A,B,C';
adodatasetchild_node.post;

                                              
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by: tirbanqsPosted on 2009-08-31 at 00:00:57ID: 25220880

...since this is an urgent program that i am making, i changed my implementation to a non db aware saving.
this solves the problem.

 

by: ozen_akyurekPosted on 2009-08-31 at 00:37:23ID: 25221046


I think you are using an identity column in SQL Server. In that case it will be so difficult to get the identity id because you need to re-read the data any way.

I can recommend you to use a regular integer column rather than an identity column. How you can do it is so simple and I will attach a sample code for you.

1- Create a sequence table for your application (sample code attached)
2- Create a sequence getting database procedure (sample code is attached as well)
3- Create an TADOStoredProcedure in Delphi side which will get an id before you insert
4- On the OnNewRecord event call the above procedure, get your id and assign this id to your id column and insert the data.

In that case, without the need of going to the server to get the identity you will know the id in advance. On the other hand, the procedure is safe enough so that all concurrent users will get different id numbers. The advantage of this approach is that, you can re-insert the data at another time to the database and the id numbers will not change. But if you were using identity it is subject to change if you need to re-insert root table records through some batch.

We have been using this approach for more than 5 years on our applications and according to me it is much better than the sequence column of MS Sql Server.

Hope this helps

create table MANUAL_SEQ (
	ID1 		integer		not null	constraint DEFAULT_MANUAL_SEQ_ID1 default 1,
	ID2 		integer		not null	constraint DEFAULT_MANUAL_SEQ_ID2 default 1,
)
go
 
 
 
-- ------------------------ GetManualSeq ------------------------------------------
create procedure GetManualSeq(@TABLE_COLUMN_NAME varchar(257), @LASTVAL integer output) as
 
  set @LASTVAL = 0
 
  begin transaction
 
  if @TABLE_COLUMN_NAME = 'ID1' 
  begin
    select @LASTVAL = ID1 from  MANUAL_SEQ with(tablockx)
    update MANUAL_SEQ set ID1 = ID1 + 1
  end
  else if @TABLE_COLUMN_NAME = 'ID2' 
  begin
    select @LASTVAL = ID2 from  MANUAL_SEQ with(tablockx)
    update MANUAL_SEQ set ID2 = ID2 + 1
  end
  commit transaction
go
                                              
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by: tirbanqsPosted on 2009-08-31 at 22:45:32ID: 31622207

thanks ozen_akyurek. i already changed my implementation to a non db aware saving.

but definitely will use your solution in other program.

thanks for your help.

20120131-EE-VQP-002

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