unit4.~pas

学生管理系统(delphi7.0+sql2000) 对学生基本信息,学生成绩,课程进行插,删,改功能

unit Unit4;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls, ToolWin, Grids, DBGrids, Buttons, DB, ADODB,
  jpeg, ExtCtrls;

type
  Tform4 = class(TForm)
    GroupBox1: TGroupBox;
    DBGrid1: TDBGrid;
    GroupBox2: TGroupBox;
    Label1: TLabel;
    Edit1: TEdit;
    Button1: TButton;
    GroupBox3: TGroupBox;
    Button2: TButton;
    SpeedButton1: TSpeedButton;
    Label2: TLabel;
    Edit2: TEdit;
    Label3: TLabel;
    Edit3: TEdit;
    Label4: TLabel;
    Edit4: TEdit;
    Label5: TLabel;
    Edit5: TEdit;
    ADOConnection1: TADOConnection;
    ADOQuery1: TADOQuery;
    DataSource1: TDataSource;
    procedure Button2Click(Sender: TObject);
    procedure FormActivate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Edit1KeyPress(Sender: TObject; var Key: Char);
    procedure SpeedButton1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  form4: Tform4;

implementation
uses unit1;

  {$R *.dfm}

procedure Tform4.Button2Click(Sender: TObject);
begin
self.Close;
end;

procedure Tform4.FormActivate(Sender: TObject);
var
sqlstr:string;
begin
sqlstr:='select *from 基本信息表';
ADOquery1.Close;
ADoquery1.SQL.Clear;
ADOquery1.SQL.Add(sqlstr);
ADOquery1.Open;
end;

procedure Tform4.Button1Click(Sender: TObject);
begin

 if edit1.Text='' then
    begin
    application.MessageBox('下面内容不能为空','提示',0+64);
    exit;
    end;
    ADOquery1.SQL.Clear;
    ADOquery1.Close;
    ADOquery1.SQL.Add('select * from 基本信息表 where 学号='''+edit1.text+'''');
    dbgrid1.Font.Color:=clteal;
    ADOquery1.Open;
    edit1.SetFocus;
    edit1.SelectAll;

   if ADOquery1.RecordCount=0 then
    begin
    application.MessageBox('你输入的数据不存在','提示',0+64);
    exit;
    end;
end;

procedure Tform4.Edit1KeyPress(Sender: TObject; var Key: Char);
begin
 if not(key in['0'..'9',#8])then
 begin
 key:=#0;
 application.MessageBox('学号只能填写数字','提示',0+64);
 exit;
 end;
end;
procedure Tform4.SpeedButton1Click(Sender: TObject);
 var
 sql:string;
begin
 sql:='where(学号 like '''+'%'+edit2.Text+'%'') and (姓名 like '''+'%'+edit3.Text+'%'') and (所在班级 like '''+'%'+edit4.Text+'%'') and(所学专业 like '''+'%'+edit5.Text+'%'')';

 ADOquery1.SQL.Clear;
 ADOquery1.Close;
 ADOquery1.SQL.Add('select * from 基本信息表');
 ADOquery1.SQL.Add(sql);
 ADoquery1.Open;

 end;
end.