.NET Zip component, Delphi Zip component, Barcode .NET, BDE Replacement and other .NET and Delphi components from ComponentAce
Products Download Order Contact us

Search
 

Delphi/C++ Components
.NET Components
ActiveX Controls
Kylix Components

Download

Download
Download Commercial
Trial Limitations

Support

Submit Request
Support Options

Order

Purchase
Competitive Upgrade
Premium Support
Sales Policy
Upgrade Policy
License Types

Info

News
Mailing List
Articles
Testimonials



About Us
Partners
Links
Contact Us
Link to Us





Home > Delphi/C++ Components > Absolute Database > Constraints Delphi Example

Absolute Database

Overview | Features | Requirements | Testimonials | SQL Samples | Code Samples | Screenshots | See Also | Download | Order
Constraints Delphi Example
Shows how to set a min and max constraints on a table field.

Download Absolute Database | Learn more

unit Main;

interface
{$I CompVer.inc}

uses
{$IFDEF D6H}
  Variants,
{$ENDIF}
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,
  Dialogs, DB, ABSMain, ABSTypes, StdCtrls, ExtCtrls, DBCtrls, Grids, DBGrids;

type
  TfrmMain = class(TForm)
    ABSTable1: TABSTable;
    GroupBox1: TGroupBox;
    Label3: TLabel;
    GroupBox2: TGroupBox;
    Label1: TLabel;
    Label2: TLabel;
    Label5: TLabel;
    Label6: TLabel;
    eMin: TEdit;
    rbByTable: TRadioButton;
    rbBySQL: TRadioButton;
    btCreateTable: TButton;
    DataSource1: TDataSource;
    ABSQuery1: TABSQuery;
    DBGrid1: TDBGrid;
    DBNavigator1: TDBNavigator;
    Label7: TLabel;
    Label4: TLabel;
    eMax: TEdit;
    Button1: TButton;
    Button2: TButton;
    procedure btCreateTableClick(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }

  public
    { Public declarations }
  end;

var
  frmMain: TfrmMain;

implementation

{$R *.dfm}

procedure TfrmMain.FormCreate(Sender: TObject);
begin
  btCreateTableClick(nil);
end;

procedure TfrmMain.btCreateTableClick(Sender: TObject);
begin
  ABSTable1.Close;
  if (rbByTable.Checked) then
    begin
      with ABSTable1 do
        begin
          with AdvFieldDefs do
            begin
              Clear;
              Add('ID', aftAutoinc);
              Add('Name', aftString,15);
              with AddFieldDef do
                begin
                  Name := 'Age';
                  DataType := aftInteger;
                  MinValue.AsInteger := StrToInt(eMin.Text);
                  MaxValue.AsInteger := StrToInt(eMax.Text);
                end;
            end;
          CreateTable;
        end;
    end
  else
    begin
      ABSQuery1.SQL.Text := Format(
         'DROP TABLE test; CREATE TABLE test (ID Autoinc, Name Char(15),'+ 
         'Age Integer MINVALUE %d MAXVALUE %d)',
         [StrToInt(eMin.Text), StrToInt(eMax.Text)]);
      ABSQuery1.ExecSQL;
    end;
  ABSTable1.Open;
end;

procedure TfrmMain.Button1Click(Sender: TObject);
begin
  ABSTable1.Append;
  ABSTable1.FieldByName('Age').AsInteger := StrToInt(eMax.Text)+1;
  ABSTable1.Post;
end;

procedure TfrmMain.Button2Click(Sender: TObject);
begin
  ABSTable1.Append;
  ABSTable1.FieldByName('Age').AsInteger := StrToInt(eMin.Text);
  ABSTable1.Post;
end;

end.



Constraints Delphi Example
Download Absolute Database | Learn more


Product Info


Current version: 7.95
Released: February 08, 2023
Price: $ 149

downloadorder


Our Customers



Testimonials

Component Ace is all that it advertises. It is easy to implement and is very fast.

In addition, the customer support is the best I have ever had. All my questions were answered within hours, often immediately. The responses also answered my questions, no need for followup emails.

If your application needs the functionality that Component Ace provides, search no further.

Linda Murphy

        © 2003 - 2024 ComponentAce  | .net zip component | barcode for .net | delphi zip component | delphi database Oct 06, 2024