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Extra info for Delphi Database Application Developer's Guide
Use only the CustNo, Company, and State fields (for simplicity). Specify a grid layout. 2 Use the Object Inspector to set the TQuery component’s Active property to True. The grid displays the query results (by default, the query selects all records). 3 Set the TQuery component’s Active property to False. The grid empties. ) 4 Use the Object Inspector to display the TQuery component’s SQL property, and type the following statement after the last line in the SQL statement in the String List Editor window: where State = "HI" 5 Click OK to close the String List Editor.
For more information For more information about • • • • Programming calculated fields, see page 82. Using the Fields Editor, see page 30. Using the Database Form Expert, see page 21. Setting a TField component’s properties, see page 79. Formatting field values at design time This example shows how to format a field value by setting the DisplayFormat property at design time. DB. Specify a vertical layout and labels aligned left. For detailed instructions, see page 21. 2 Use the Object Inspector to change the form’s Name property to EdCustForm, change the TTable component’s Name property to Cust, and change the TTable component’s Active property to True.
Linking tables, see step 6 on page 25. Working with fields Examples in this section show how use code to control field values and display attributes. Delphi’s data-aware controls enable end users to view and edit table data, but to access the underlying data or control how it is displayed, you want to create field components. Use the Fields Editor to define a list of fields and work with invisible components of type TField. Creating Tfield components This example explains how to use the Fields Editor to define a list of some or all of the fields (columns) in a table.