I would like to have a hook on my database connection. Every time there's an update on any table in the database, I'd like to use a function in my code(preferably with parameters from the executed query if that's possible).
I'm using the FireDac components; TFDConnection, TFDPhysSQLiteDriverLink, TFDQuery and TFDEventAlerter.
Code at init:
FDEventAlerter1.Names.Clear;
FDEventAlerter1.Names.Add('intEv');
FDEventAlerter1.Options.Synchronize := true;
FDEventAlerter1.Options.Kind := 'Events';
FDEventAlerter1.OnAlert := FDEventAlerter1Alert;
FDEventAlerter1.Active := true;
Code at OnAlert
procedure TDataModule1.FDEventAlerter1Alert(ASender: TFDCustomEventAlerter;
const AEventName: string; const AArgument: Variant);
begin
ShowMessage('test');
end;
Code from CreateTable query:
CREATE TABLE IF NOT EXISTS int(
ValuesInt INTEGER NOT NULL,
ValuesIntTime TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);
DROP TRIGGER IF EXISTS intEv;
CREATE TRIGGER IF NOT EXISTS intEv
AFTER INSERT ON int
BEGIN
SELECT POST_EVENT('trigger');
END;
Code at insert query which gets executed every 10 sec:
INSERT INTO int(valuesint) VALUES (:int);
When I run this, the database gets filled with integers, but no event is triggered.
the TSQLiteDatabase.onUpdate (chapter 9.1) gave me what I needed.
sqlDb: TSQLiteDatabase;
sqlDb := TSQLiteDatabase(FDConnection1.CliObj);
sqlDb.OnUpdate := DoUpdate;
procedure TDataModule1.DoUpdate(ADB: TSQLiteDatabase; AOper: Integer; const ADatabase, ATable: String; ARowid: int64);
begin
//http://www.sqlite.org/c3ref/c_alter_table.html
if AOper = {SQLITE_INSERT}18 then
sleep(1);
end;