You can find the MSSQL sample project at:
- Start | Programs | Embarcadero RAD Studio 10.2 Tokyo | Samples and then navigate to:
Object Pascal\Database\FireDAC\Samples\Getting Started\MSSQL
- Subversion Repository:
The MSSQL getting started sample shows how to use FireDAC with MS Access databases. This sample allows the user to create temporary connection definition at run-time and master-details relationship between datasets using TFDQuery to work with MSSQL databases
How to Use the Sample
- Navigate to the location given above and open
- Press F9 or choose Run > Run.
|File in Delphi||Contains|
The project itself.
The main form.
The sample implements the following features.
Creating temporary connection definition
with dbMain do begin Close; // create temporary connection definition with Params do begin Clear; Add('DriverID=MSSQL'); Add('Server=(local)'); Add('Database=FDDemo'); end; Open; end;
In the sample, the temporary definition is created when clicking the Connect button.
In the demo database, the Categories and Products tables have one-to-many relation by
CategoryID field. The qryCategories.SQL property is set up as follows:
select * from Categories
In addition, the qryProducts.SQL property is set up as follows:
select * from Products where CategoryID = :CategoryID
Finally, the qryProducts.MasterSource property is set to
dsCategories, while the MasterFields property is set to
CategoryID. This creates a master-details relationship between the datasets.
Inserting a record providing parameters of various types:
dbMain.ExecSQL('insert into Categories(CategoryName, Description, Picture) ' + 'values(:N, :D, :P)', ['New category', 'New descr', $0334]);
dbMain.ExecSQL('update Products set UnitPrice = UnitPrice * :P1 + :P2 ' + 'where ProductID < 3', [Random(5), Random(3)]);
Deleting a record:
dbMain.ExecSQL('delete from Categories where CategoryName like :N', ['New category']);
Getting a scalar value from the database:
iID := dbMain.ExecSQLScalar('select MAX(CategoryID) from Categories');
- Defining Connection (FireDAC)
- Connect to Microsoft SQL Server (FireDAC)
- Master-Detail Relationship (M/D)
- MS SQL Server Questions (FireDAC)