Writing Data Access Code
This section provides a simple scenario that shows how to write the basic data access code needed to pipe Act-On data into your application. The code example chains FireDAC components like TFDConnection and TFDQuery and executes a SELECT query with simple GUI components.
Setting Connection Properties
To begin accessing Act-On through a TFDConnection component and then other FireDAC components, create a connection and link the FireDAC components:
- Initialize the Act-On component: Add a TFDPhysActOnDriverLink object to your project.
- Link with a TFDConnection object: Set the DriverName property of the TFDConnection object to the Driver Id of the component, CData.ActOn.
- Define connection properties through the TFDPhysActOnConnectionDefParams object. This object enables you to use Code Insight and compiler syntax checking.
FDConnection1.Name := 'SQLTest'; FDConnection1.DriverName := 'CData.ActOn'; with FDConnection1.Params as TFDPhysCDataActOnConnectionDefParams do begin ... end;
You can also set connection properties through the FDManager function. See Connection Definitions for other ways to define connections.
Execute SQL Queries to Act-On
You can use the TFDQuery object to execute any SQL statement.
- Set the Connection property of a TFDQuery object to a TFDConnection instance.
- Set the Connected property of the TFDConnection object to True to open the connection.
- Call the Open method to execute SELECT queries with a TFDQuery object.
FDQuery1.Connection := FDConnection1; FDConnection1.Connected := true; FDQuery1.Active := true; FDQuery1.Open('SELECT * FROM Images WHERE FolderName = ''New Folder''');
See Querying Data for more information on selecting Act-On data with the TFDQuery class.