Writing Data Access Code
This section provides a simple scenario that shows how to write the basic data access code needed to pipe Azure Data Management 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 Azure Data Management through a TFDConnection component and then other FireDAC components, create a connection and link the FireDAC components:
- Initialize the Azure Data Management component: Add a TFDPhysAzureDataManagementDriverLink 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.AzureDataManagement.
- Define connection properties through the TFDPhysAzureDataManagementConnectionDefParams object. This object enables you to use Code Insight and compiler syntax checking.
FDConnection1.Name := 'SQLTest'; FDConnection1.DriverName := 'CData.AzureDataManagement'; with FDConnection1.Params as TFDPhysCDataAzureDataManagementConnectionDefParams 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 Azure Data Management
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 Subscriptions WHERE SubscriptionId = ''fadc4-4cdaf-fadc4-4cdaf''');
See Querying Data for more information on selecting Azure Data Management data with the TFDQuery class.