盒子论坛 v2.1

当执行下面的程序，按“查询”按钮后会报错：
Project project123.exe raised exception class EDatabaseError with message'Query1:Field'input11'is of an unknown type'.Process stopped.Use Step
or Run to continue.

code segment:

unit p123;
interface
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, DB, DBTables, Grids, DBGrids;

type
  TForm1 = class(TForm)
    DBGrid1: TDBGrid;
    Edit1: TEdit;
    Button1: TButton;
    Query1: TQuery;
    Edit2: TEdit;
    Edit3: TEdit;
    DataSource1: TDataSource;
    Query1Code: TStringField;
    Query1Name: TStringField;
    Query1Type: TStringField;
    Query1Number: TFloatField;
    Query1Price: TFloatField;
    Query1Cash: TFloatField;
    Query1Date: TDateField;
    Query1Memo: TStringField;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
strsql:string;
input11:string;
begin
  if trim(edit1.text)<>'then
  begin
    input11:=edit1.Text;
    strsql:='select * from handset where name=:input11';
  if query1.Active then
    query1.Active:=false;
  query1.SQL.Clear;
  query1.SQL.Add(strsql);
  query1.Active:=true;
end;
end;

end.

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命运是一只沦落在鸡窝里的鹰

作者：

waterstone (waterstone)	★☆☆☆☆	-
	盒子活跃会员

2004/2/16 17:56:15

1楼：

应该这样引用变量
strsql:='select * from handset where name="'+input11+'"';

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我来自农村广阔的田野我的每一个动作都很夸张http://waterstone.51r.com

作者：

peeper (peeper)	★☆☆☆☆	-
	盒子活跃会员

2004/2/18 12:48:55

2楼：

你可以使用：
strsql:='select * from handset where name=:pinput'
query1.sql.text:=strsql;
query1.parambyname('pinput'):=input11;
query1.active:=true;
或者，直接写：
strsql:='select * from handset where name= '+#39+input11+#39;
代码比较容易读
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