如何把图片存到数据库中(最好附源码,跪求)!!

Question

小弟刚刚学delphi想做一个 人事系统 但不知道如何把图片从数据库中存取.
那位大哥,大姐知道的话一定要拉兄弟一把!!!

Answer 1

保存图片到数据库的话，下边可以考虑。。//记得加上uses jpeg ;
//其中有些地方不是太严密，回去修改下。。
//delphi7+ sql2000通过.可以保存jpeg,jpg,bmp三种格式。unit Unit1;interfaceuses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, jpeg,DB, ADODB, ExtCtrls, Buttons, Grids, DBGrids,
  DBCtrls;type
  TForm1 = class(TForm)
    ADOConnection1: TADOConnection;
    ADOQuery1: TADOQuery;
    Button1: TButton;
    OpenDialog1: TOpenDialog;
    Edit1: TEdit;
    Image1: TImage;
    Image2: TImage;
    BitBtn1: TBitBtn;
    DBGrid1: TDBGrid;
    DataSource1: TDataSource;
    ADOQuery1pic: TBlobField;
    ADOQuery1borj: TStringField;
    procedure Button1Click(Sender: TObject);
    procedure BitBtn1Click(Sender: TObject);  private
    { Private declarations }
  public
    { Public declarations }
  end;var
  Form1: TForm1;
  s:string;
  s1:string;
implementation{$R *.dfm}procedure TForm1.Button1Click(Sender: TObject);
var
bitmap1:tbitmap;
pjpg:tjpegimage;
pic:TMemoryStream;begin
pjpg:=tjpegimage.Create;
if opendialog1.Execute
    then
     s:=opendialog1.FileName ;
     s1:=extractfileext(s);
         
     if (uppercase(s1) ='.JPG' ) or (uppercase(s1)='.JPEG') // 图片格式一定要大写
       THEN
         begin
              pjpg.LoadFromFile(s );
              pic:=TMemoryStream.Create;
              pjpg.SaveToStream(pic);
              image1.Picture.Bitmap.Assign(pjpg);              pic.Position:=0;
              adoquery1.Insert ;
              adoquery1.FieldByName('borj').VALUE := 2;
              TBlobField(adoquery1.FieldByName('pic')).LoadFromStream(pic);
              adoquery1.post;
              pic.Free;
              pjpg.free;
        end ;    if (uppercase(s1)='.BMP')    then           begin
              edit1.Text :=uppercase(s1);             image1.Picture.LoadFromFile(s);
             adoquery1.Insert ;
             adoquery1.FieldByName('pic').Assign(image1.Picture.Graphic);
             adoquery1.FieldByName('borj').VALUE := 3;             adoquery1.Post ;
          end;
 end;  procedure TForm1.BitBtn1Click(Sender: TObject);   var
    jpeg:tjpegimage;
      begin
       image1.Picture.Graphic :=nil;
            with adoquery1 do
                 begin
                    if adoquery1.FieldByName('borj').Value =3   // bmp
                    then
                     image2.Picture.Bitmap.Assign(fieldbyname('pic'))  ;                     if adoquery1.FieldByName('borj').Value =2  //jpge;                     then
                        begin
                               jpeg:=tjpegimage.Create ;
                                try
                                 jpeg.Assign(adoquery1.FieldByName('pic') );
                                  image2.Picture.Graphic:=jpeg;
                                   finally
                                   jpeg.Free ;
                                 end;
                        end;                 end ;
                    end;end.

Answer 2

最简单的方法使用 Dev Express 控件中 cxDBImage , 属性直接绑定字段名称就可以了, 如果要手动存入可用如下方法:
     
if FileExists(ImageFileName) then
 begin
  ADODataSet1.Edit;
  Tblobfield(Image.DataBinding.Field).LoadFromFile( ImageFile);
  ADODataSet1.Post; 
 end;其中 Image 为 cxDBImage 控件

Answer 3

form1.ADOConnection1.Open;
  try
    with form1.ADOQuery1 do
      begin
        close;
        sql.Clear;
        sql.Add('insert into testi values (:a)');
        parameters.ParamByName('a').LoadFromFile('D:\Photoshop\MyPicture\笑傲江湖.bmp',ftGraphic);
        execsql;
      end;
  finally
  end;

Answer 4

自己慢慢看unit Unit1;interfaceuses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,jpeg,
  ExtDlgs, Db, DBTables, StdCtrls, ExtCtrls, ADODB;type
  TForm1 = class(TForm)
    Button1: TButton;
    OpenPictureDialog1: TOpenPictureDialog;
    Button2: TButton;
    Image1: TImage;
    ADOQuery1: TADOQuery;
    ADOQuery2: TADOQuery;
    Edit1: TEdit;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
    filename:string;
    procedure SetPicture(pos:string;TempQuery:TADOQuery);     /////往数据库中插入图片
    procedure GetPicture(pos:string;TempQuery:TADOQuery);      ////得到图片
  end;var
  Form1: TForm1;implementation{$R *.DFM}{ TForm1 }procedure TForm1.GetPicture(pos:string;TempQuery: TADOQuery);
var
  MS_JpegStream:TMemoryStream;
begin
  try
    MS_JpegStream:=TMemoryStream.Create;
    with tempQuery do
      begin
        close;
        sql.clear;
        //修改这个语句
        sql.Add('select picture from table where no=:pos');
        Parameters.ParamByName('pos').value:=pos;
        Open;
      end;
    if tempquery.FieldByName('image').isnull then
      begin
        image1.Picture.Graphic:=nil;
      end
    else
      begin
         (tempQuery.FieldByName('image') as tblobfield).savetostream(MS_JpegStream);
         image1.Picture.Graphic:=nil;
         image1.Picture.Graphic:=TJpegImage.Create;
         MS_JpegStream.Position:=0;
         image1.Picture.Graphic.LoadFromStream(MS_JpegStream);
      end;  finally
    MS_JpegStream.Free;
  end;end;procedure TForm1.SetPicture(pos:string; TempQuery: TADOQuery);
var
  MS_JpegStream:TMemoryStream;
  M_BitMap:TBitMap;
  M_Jpeg:TJpegImage;
begin
  try
    MS_JpegStream:=TMemoryStream.Create;
    M_BitMap:=TBitMap.Create;
    M_Jpeg:=TJpegImage.Create;
    if extractfileext(filename)='.bmp' then
      begin
        M_BitMap.LoadFromFile(filename);
        M_Jpeg.Compress;
        M_Jpeg.Assign(M_BitMap);
      end
    else if extractfileext(filename)='.jpg' then
      begin
        M_Jpeg.LoadFromFile(filename);
      end;
    M_Jpeg.SaveToStream(MS_JpegStream);
    with tempQuery do
      begin
        close;
        sql.clear;
//修改这个语句
        sql.Add('insert into table (no,IMage) values (:pos,:image)');
        Parameters.ParamByName('pos').Value:=pos;
        Parameters.ParamByName('image').LoadFromStream(MS_JpegStream,ftblob);        ExecSQL;
      end;
  finally
    MS_JpegStream.Free;
    M_BitMap.Free;
    M_Jpeg.Free;
  end;
end;procedure TForm1.Button1Click(Sender: TObject);//打开图片并写入数据库
begin
  if openpicturedialog1.Execute then
  begin
   filename:=openpicturedialog1.FileName;
   SetPicture(edit1.text,ADOQuery1);
  end
end;procedure TForm1.Button2Click(Sender: TObject);//显示图片
begin
  getpicture(edit1.text,ADOQuery2);
end;end.

Answer 5

图片保存在数据库中你的库会膨胀得很快，我的做法是只在数据库中存图片名称。具体例子在我网站http://www.web1688.com有下载