deleteinfosrc.pas

报警地图电子显示源代码

unit DeleteInfoSrc;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, Grids, DBGrids;

type
  TFormDeleteInfo = class(TForm)
    DBGrid1: TDBGrid;
    Edit1: TEdit;
    ComboBoxDeleteInfo: TComboBox;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Button5: TButton;
    Label1: TLabel;
    Label2: TLabel;
    procedure ButtonOKClick(Sender: TObject);
    procedure ButtonDelAllClick(Sender: TObject);
    procedure ButtonDeleteClick(Sender: TObject);
    procedure ButtonCancelClick(Sender: TObject);
    procedure Button5Click(Sender: TObject);
    procedure FormActivate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  FormDeleteInfo: TFormDeleteInfo;

implementation
uses
BJInfoSrc,QDialogs, BJDataSrc;
{$R *.dfm}

procedure TFormDeleteInfo.ButtonOKClick(Sender: TObject);
var
     strSQL:string;
begin
     strSQL := 'select * from BJJLB where ' + ComboBoxDeleteInfo.Text + ' like ' + '"%'+ Edit1.Text + '%"';
     FormBJInfo.ADOQuery1.Close;
     FormBJInfo.ADOQuery1.SQL.Clear;
     FormBJInfo.ADOQuery1.SQL.Text := strSQL;
     FormBJInfo.ADOQuery1.Open;
end;

procedure TFormDeleteInfo.ButtonDelAllClick(Sender: TObject);
var
     strSQL:string;
begin
     strSQL := 'select * from BJJLB';
     FormBJInfo.ADOQuery1.Close;
     FormBJInfo.ADOQuery1.SQL.Clear;
     FormBJInfo.ADOQuery1.SQL.Text := strSQL;
     FormBJInfo.ADOQuery1.ExecSQL;

     DBGrid1.ReadOnly:=false;
     FormBJInfo.ADOQuery1.Open;
     while not FormBJInfo.ADOQuery1.Eof do
     begin
          FormBJInfo.ADOQuery1.Delete;
          //FormBJInfo.ADOQuery1.Next;
     end;
     DBGrid1.ReadOnly:=true;
end;

procedure TFormDeleteInfo.ButtonDeleteClick(Sender: TObject);
begin
     if FormBJInfo.ADOQuery1.IsEmpty then
     begin
           ShowMessage('已经没有记录可删除!');
           Exit;
     end;
     DBGrid1.ReadOnly:=false;
     FormBJInfo.ADOQuery1.Delete;
     DBGrid1.ReadOnly:=true;
     Edit1.Text := '';
end;

procedure TFormDeleteInfo.ButtonCancelClick(Sender: TObject);
begin
    Close;
end;

procedure TFormDeleteInfo.Button5Click(Sender: TObject);
var
     strSQL:string;
begin
     strSQL := 'select * from BJJLB';
     FormBJInfo.ADOQuery1.Close;
     FormBJInfo.ADOQuery1.SQL.Clear;
     FormBJInfo.ADOQuery1.SQL.Text := strSQL;
     FormBJInfo.ADOQuery1.Open;
end;

procedure TFormDeleteInfo.FormActivate(Sender: TObject);
var i,num:Integer;
    str:string;
    strSQL:string;
begin
        ComboBoxDeleteInfo.clear;
        strSQL := 'select * from BJJLB';
        FormBJInfo.ADOQuery1.Close;
        FormBJInfo.ADOQuery1.SQL.Clear;
        FormBJInfo.ADOQuery1.SQL.Text := strSQL;
        FormBJInfo.ADOQuery1.Open;
        num:=FormBJInfo.ADOQuery1.FieldCount;
        for i:=0 to num-1 do
        begin
          str:=FormBJInfo.ADOQuery1.FieldList.Strings[i];
          ComboBoxDeleteInfo.Items.Add(str);
        end;
        ComboBoxDeleteInfo.ItemIndex := 0;
        Edit1.Text := '';
        strSQL := 'select * from BJJLB';
        FormBJInfo.ADOQuery1.Close;
        FormBJInfo.ADOQuery1.SQL.Clear;
        FormBJInfo.ADOQuery1.SQL.Text := strSQL;
        FormBJInfo.ADOQuery1.Open;
end;

end.