TDataSource

TDataSource is a component that mediates communication between a TDataSet based component that represents the database contents and Data Controls like TDBGrid.

Typically, a TDataSource contains a field 'DataSet' that connects to a TSQLQuery or other TDataSet descendant. The DataSource should connect to the 'DataSource' field of a TDBGrid or other Data Control component.

 SQLTransaction1.Database := SQLConnection1;
 SQLQuery1.Transaction := SQLTransaction1;
 DataSource1.DataSet := SQLQuery1;
 DBGrid1.DataSource := DataSource1;

Freepascal Documentation

• http: //www.freepascal.org/docs-html/fcl/db/tdatasource.html