老是运行出错 以下是代码:
unit Unit1;interfaceuses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, DB, DBTables, StdCtrls, Mask, DBCtrls;type
TForm1 = class(TForm)
lbl1: TLabel;
lbl2: TLabel;
dbedt1: TDBEdit;
dbedt2: TDBEdit;
btn1: TButton;
btn2: TButton;
btn3: TButton;
btn4: TButton;
datasource1: TDataSource;
table1: TTable;
procedure FormCreate(Sender: TObject);
procedure FormClose(Sender: TObject; var Action: TCloseAction);
procedure btn1Click(Sender: TObject);
procedure btn2Click(Sender: TObject);
procedure btn3Click(Sender: TObject);
procedure btn4Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;var
Form1: TForm1;implementation{$R *.dfm}procedure TForm1.FormCreate(Sender: TObject);
begin
table1.Active := True ; //打开数据表
end;procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
table1.Active := False ; //关闭数据库
end;procedure TForm1.btn1Click(Sender: TObject);
begin
if table1.Bof then //假如数据记录在最前
begin
btn1.Enabled :=False ; //使按钮失效
end
else
begin
table1.Prior ; //上一条记录
btn2.Enabled :=True ;
btn4.Enabled :=True;
end;
end;procedure TForm1.btn2Click(Sender: TObject);
begin
if table1.Eof then //假如是最后一条记录
begin
btn2.Enabled :=True ;
end
else
begin
table1.Next ; //下一条记录
btn1.Enabled :=True ;
btn4.Enabled :=True ;
end;
end;private Sub cmdNext_click()
procedure TForm1.btn3Click(Sender: TObject);
begin
if dbedt1.Text :='' or dbedt2.Text := '' then
begin
ShowMessage('请输入学号,姓名');
end
else
begin
ShowMessage('添加成功');
table1.Append ; //追加数据
end;
end;procedure TForm1.btn4Click(Sender: TObject);
begin
if MessageDlg('确认要删除记录么?',mtConfirmation ,[mbYes,mbNo],0)=mrYes then
begin
table1.Edit ; //使数据表可编辑
table1.Delete ; //删除数据记录
table1.Post ; //提交删除操作
end;
end;end.
一下是错误:Build
[Error] Unit1.pas(78): Declaration expected but identifier 'private' found
[Error] Unit1.pas(81): Incompatible types: 'String' and 'procedure, untyped pointer or untyped parameter'
[Fatal Error] Project1.dpr(5): Could not compile used unit 'Unit1.pas'
3个错误是什么意思?
另外private Sub cmdNext_click()这个是什么? 什么作用?
unit Unit1;interfaceuses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, DB, DBTables, StdCtrls, Mask, DBCtrls;type
TForm1 = class(TForm)
lbl1: TLabel;
lbl2: TLabel;
dbedt1: TDBEdit;
dbedt2: TDBEdit;
btn1: TButton;
btn2: TButton;
btn3: TButton;
btn4: TButton;
datasource1: TDataSource;
table1: TTable;
procedure FormCreate(Sender: TObject);
procedure FormClose(Sender: TObject; var Action: TCloseAction);
procedure btn1Click(Sender: TObject);
procedure btn2Click(Sender: TObject);
procedure btn3Click(Sender: TObject);
procedure btn4Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;var
Form1: TForm1;implementation{$R *.dfm}procedure TForm1.FormCreate(Sender: TObject);
begin
table1.Active := True ; //打开数据表
end;procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
table1.Active := False ; //关闭数据库
end;procedure TForm1.btn1Click(Sender: TObject);
begin
if table1.Bof then //假如数据记录在最前
begin
btn1.Enabled :=False ; //使按钮失效
end
else
begin
table1.Prior ; //上一条记录
btn2.Enabled :=True ;
btn4.Enabled :=True;
end;
end;procedure TForm1.btn2Click(Sender: TObject);
begin
if table1.Eof then //假如是最后一条记录
begin
btn2.Enabled :=True ;
end
else
begin
table1.Next ; //下一条记录
btn1.Enabled :=True ;
btn4.Enabled :=True ;
end;
end;private Sub cmdNext_click()
procedure TForm1.btn3Click(Sender: TObject);
begin
if dbedt1.Text :='' or dbedt2.Text := '' then
begin
ShowMessage('请输入学号,姓名');
end
else
begin
ShowMessage('添加成功');
table1.Append ; //追加数据
end;
end;procedure TForm1.btn4Click(Sender: TObject);
begin
if MessageDlg('确认要删除记录么?',mtConfirmation ,[mbYes,mbNo],0)=mrYes then
begin
table1.Edit ; //使数据表可编辑
table1.Delete ; //删除数据记录
table1.Post ; //提交删除操作
end;
end;end.
一下是错误:Build
[Error] Unit1.pas(78): Declaration expected but identifier 'private' found
[Error] Unit1.pas(81): Incompatible types: 'String' and 'procedure, untyped pointer or untyped parameter'
[Fatal Error] Project1.dpr(5): Could not compile used unit 'Unit1.pas'
3个错误是什么意思?
另外private Sub cmdNext_click()这个是什么? 什么作用?
Could not compile used unit 'Unit1.pas'
不能编译'Unit1.pas'单元
Build
[Error] Unit1.pas(81): Operator not applicable to this operand type
[Fatal Error] Project1.dpr(5): Could not compile used unit 'Unit1.pas'
procedure TForm1.btn3Click(Sender: TObject);
begin
if (dbedt1.Text :='') or (dbedt2.Text := '') then //这里产生的结果应该是布尔型的
begin
ShowMessage('请输入学号,姓名');
end
else
begin
ShowMessage('添加成功');
table1.Append ; //追加数据
end;
end;