This sample shows how to redirect inserting, deleting and updating records using standalone table adapter.
Table of Contents
Location
You can find the Commands sample project at:
- Start | Programs | Embarcadero RAD Studio Sydney | Samples and then navigate to:
Object PascalDatabaseFireDACSamplesDApt LayerCommands
- Subversion Repository:
- You can find Delphi code samples in GitHub Repositories. Search by name into the samples repositories according to your RAD Studio version.
Files
| File in Delphi | Contains |
|---|---|
Commands.dprojCommands.dpr | The project itself. |
fCommands.pasfCommands.fmx | The main form. |
Implementation
The sample implements the following standalone table adapter features.
Create table adapter
|
1 2 3 4 5 |
<strong>var</strong> oAdapt: IFDDAptTableAdapter; <strong>begin</strong> <em>// create table adapter</em> FDCreateInterface(IFDDAptTableAdapter, oAdapt); |
Selecting data
|
1 2 3 4 5 6 7 |
<strong>with</strong> oAdapt <strong>do</strong> <strong>begin</strong> FConnIntf.CreateCommand(oComm); SelectCommand := oComm; SelectCommand.Prepare('select * from {id FDQA_map1}'); Define; Fetch; <em>//...</em> |
Redirect records
Redirect all record inserts into FDQA_map2 table instead FDQA_map1:
|
1 2 3 |
FConnIntf.CreateCommand(oComm); InsertCommand := oComm; InsertCommand.CommandText := 'insert into {id FDQA_map2}(id2, name2) values(:NEW_id1, :NEW_name1)'; |
Redirect all record deletes into FDQA_map3 table instead FDQA_map1:
|
1 2 3 |
FConnIntf.CreateCommand(oComm); DeleteCommand := oComm; DeleteCommand.CommandText := 'delete from {id FDQA_map3} where id3 = :OLD_id1'; |
Redirect all record updates into FDQA_map4 table instead FDQA_map1:
|
1 2 3 |
FConnIntf.CreateCommand(oComm); UpdateCommand := oComm; UpdateCommand.CommandText := 'update {id FDQA_map4} set id4 = :NEW_id1, name4 = :NEW_name1 where id4 = :OLD_id1'; |
Add new rows
|
1 2 |
<strong>for</strong> i := 0 <strong>to</strong> 4 <strong>do</strong> DatSTable.Rows.Add([i, 'string' + IntToStr(i)]); |
Post changes to RDBMS
|
1 |
Update; |
For more details and links to other posts, you can refer to the link below:
http://docwiki.embarcadero.com/CodeExamples/Sydney/en/FireDAC.DAptLayerCommands_Sample
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