我用的這兩種方法,不管是哪一種,大體原理上都是打開文本,然後一行行讀出,再根據分隔符拆分字段,然後再用ADO來一條條記錄插入數據庫中,但採用的ADO的方式不同,第一種用普通的ADOQUERY來操作,第二種則採用ADO的原生對象來操作,但在速度上是明顯後一種佔優的,且是很大的優勢,原因我說不來,但認爲是個不錯的方法,雖然導入文本還有別的很好的方法,例如採用SQLSERVER的DTS等。但這些我還沒做過嘗試,就暫不說了。
1、
if dlgOpendatain.Execute then
begin
datapath := dlgOpendatain.FileName; //取得文件路徑
Filepath := ExtractFileName(datapath); //取得文件名
AssignFile(TeFile1, datapath); //將文件變量與文件關聯
Reset(TeFile1); //以讀寫方式打開類型文件和無類型文件
try
j := 0;
while not Eof(TeFile1) do
begin
application.ProcessMessages;
Readln(TeFile1, str); //一行一行的讀文件,str爲一行的字符串
recordstr := str;
inc(j);
i := 0;
while pos(#9, recordstr) > 0 do //#9是tab分隔符
begin
str := Copy(recordstr, 1, Pos(#9, recordstr) - 1);
case i of
0:str1 := str;
1:str2 := str;
end;
i := i + 1;
recordStr := copy(recordstr, (Pos(#9, recordstr) + 1),
length(recordstr));
if i = 2 then
str4 := trim(uppercase(recordStr));
end;
ADOQuery1.Close;
ADOQuery1.SQL.Clear;
ADOQuery1.SQL.TEXT:='INSERT INTO S1,S2,S3 VALUES('+''''+
str1''''+','+''''+str2+''''+','+''''+str3+''''+')';
ADOQuery1.Prepare;
ADOQuery1.ExecSQL ;
end;
MessageBox(GetactiveWindow(), '當前導入數據完畢!', '提示',
MB_OK + mb_iconexclamation);
except
CloseFile(TeFile1);
end;
end;
2、
按下面的方法,四萬條記錄全部導入ACCESS,直接從文本中裝載23.90秒,當我將文本裝載到MEMO1中的時候,八萬條記錄全部導入ACCESS也不過四十一秒。
unit Unit1;
interface
uses
Windows,
Messages,
SysUtils,
Variants,
Classes,
Graphics,
Controls,
Forms,
Dialogs,
StdCtrls,
ComCtrls,
Gauges,
DB,
ADODB,
ComObj,
ADOInt;
type
TStrArray = array[1..9] of string;
type
TForm1 = class(TForm)
Button1: TButton;
OpenDialog1: TOpenDialog;
StatusBar1: TStatusBar;
Gauge1: TGauge;
ADOConnection: TADOConnection;
Label1: TLabel;
Memo1: TMemo;
procedure Button1Click(Sender: TObject);
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1 : TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
const
TabChar = #32; //定義空格鍵
var
i, j : integer;
D1 : Real;
TeFile1 : TextFile;
datapath, Filepath, str: string;
dd : TStrArray;
AdoRecordSet : variant;
FConnectionObject : _Connection;
begin
AdoRecordSet := CreateOleObject('ADODB.RecordSet');
ADOConnection.Connected := True;
FConnectionObject := ADOConnection.ConnectionObject;
AdoRecordSet.CursorLocation := clUseClient;
AdoRecordSet.open('select * from abcdefg where 1=2', FConnectionObject,
adOpenStatic, adLockOptimistic, AdCmdText); //寫數據庫
try
OpenDialog1.Title := '請選擇要打開的文件';
OpenDialog1.Filter := '數據文件(*.txt)|*.txt';
if OpenDialog1.Execute then
begin
DataPath := OpenDialog1.FileName; //取得文件路徑
Filepath := ExtractFileName(DataPath); //取得文件名
// Memo1.Lines.Clear;
// Memo1.Lines.LoadFromFile(DataPath); //.LoadFromStream(ms2);
AssignFile(TeFile1, DataPath); //將文件變量與文件關聯
Reset(TeFile1); //以讀寫方式打開類型文件和無類型文件
statusbar1.Panels[1].Text := FormatDateTime('hh:mm:ss', now()); //開始時間
//Gauge1.MaxValue:=Memo1.Lines.Count;
D1 := Now;
try
// for i := 0 to Memo1.Lines.Count do
while not Eof(TeFile1) do
begin
Application.ProcessMessages;
Readln(TeFile1, str); //一行一行的讀文件,str爲一行的字符串
statusbar1.Panels[3].Text := str;
//str := Memo1.Lines[i];
j := 1;
while pos(TabChar, str) > 0 do
begin
dd[j] := Copy(str, 1, pos(TabChar, str));
Delete(str, 1, Pos(TabChar, str) + 1);
Str := TRIM(Str);
Inc(j);
end;
DD[9] := str;
AdoRecordSet.AddNew;
try
AdoRecordSet.fields[1].value := DD[1];
AdoRecordSet.fields[2].value := DD[2];
AdoRecordSet.fields[3].value := DD[3];
AdoRecordSet.fields[4].value := DD[4];
AdoRecordSet.fields[5].value := DD[5];
AdoRecordSet.fields[6].value := DD[6];
AdoRecordSet.fields[7].value := DD[7];
AdoRecordSet.fields[8].value := DD[8];
AdoRecordSet.fields[9].value := DD[9];
AdoRecordSet.Update;
except
end;
Inc(i);
//Gauge1.Progress:=Gauge1.Progress + 1;
Label1.Caption:=IntToStr(i);
end;
statusbar1.Panels[2].Text := FormatDateTime('hh:mm:ss', now()); //結束時間
statusbar1.Panels[0].Text := '總用時: ' + Floattostr((NOW - D1) * 24 *
60 * 60);
MessageBox(GetactiveWindow(), '當前導入數據完畢!', '提示',
MB_OK + mb_iconexclamation);
except
CloseFile(TeFile1);
end;
end;
finally
AdoRecordSet.Close;
end;
end;
procedure TForm1.FormCreate(Sender: TObject);
var //聯接ACCESS數據庫的方法。
path : string;
begin
path := ExtractFilePath(Application.ExeName); //程序路徑
if path[Length(path)] <> '/' then
path := path + '/';
ADOConnection.Connected := False;
try
ADOConnection.ConnectionString :=
'Provider=Microsoft.Jet.OLEDB.4.0;Data Source=' +
path + 'Data.MDB' + ';Persist Security Info=False';
ADOConnection.Connected := true;
except
MessageBox(GetActiveWindow(), '系統錯誤!', '警告', MB_OK + MB_ICONWARNING);
application.Terminate;
end;
end;
end.
種用ADO從文本文件中導入數據庫的兩種方法比較
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