我在写一接口程序,分别连接A,B两个数据库,要将数据库A中Table1表的数据转移到数据库B中的Table2中,并完成相应的统计计算,但Table1中的数据量比较大,按天来取大概有10W条,所以我想用多线程的方式来实现,比如说Table1中有5W条数据,我同时开5个线程,并发处理,请教各位有没有相似的例子,我的邮件[email protected],收到例子马上结贴,谢谢.
调试欢乐多
TFieldabc = record
Field1:string;
Field2: string;
//...
end;
...maxthreadcount=5var
abc:TFieldabc;
threadcount:integer;
begin
//自己打开读取table1
while not adoquery1.eof do
begin
//把记录读取到 abc 中 while (ThreadCount >= MaxThreadCount)
do
begin
if (Stop_flag = true) then //stop_flag 是中断标识
break;
Application.ProcessMessages();
Sleep(1);
end;
if (Stop_flag = true) then break;
TInstTable2.Create(false, abc);
//TInstTable2是插入table2线程 注意线程生成时 threadcount +1 ,线程结束时 threadcount -1 就行了
adoquery1.next;
end;end;
数据库A是Sybase,数据库B是Oracle,不支持异构数据库同步~~
QQ号是好多,能加QQ详聊吗??
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, Grids, DBGrids, DB, ADODB,ActiveX;type
TForm1 = class(TForm)
ADOConnection1: TADOConnection;
ADOConnection2: TADOConnection;
ADOQuery1: TADOQuery;
ADOQuery2: TADOQuery;
DataSource1: TDataSource;
DataSource2: TDataSource;
DBGrid1: TDBGrid;
DBGrid2: TDBGrid;
Button1: TButton;
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
TThreadQuery = class(TThread) { 声明线程类 }
private
FQuery: TADOQuery; { 线程中的查询组件 }
FDataSource: TDataSource; { 与查询组件相关的数据感知组件 }
procedure ConnectDataSource;{ 连接数据查询组件和数据感知组件的方法 }
protected
procedure Execute; override;{ 执行线程的方法 }
public
constructor Create(Query: TADOQuery;
DataSource: TDataSource); virtual; { 线程构造器 }
end;
var
Form1: TForm1;
Q1,Q2:TThreadQuery;
implementation{$R *.dfm}
procedure TThreadQuery.ConnectDataSource;
begin
FDataSource.DataSet := FQuery;{ 该方法在查询结束后才调用 }
end;procedure TThreadQuery.Execute;{ 执行线程的方法 }
begin
Try
try//加
CoInitialize(nil);//加 FQuery.Open; { 打开查询 }
Synchronize(ConnectDataSource);{ 线程同步 } finally//加
CoUninitialize;//加
end;//加except
ShowMessage('Query Error'); { 线程异常 }
end;end;{ 线程查询类的构造器 }
constructor TThreadQuery.Create(Query: TADOQuery; DataSource: TDataSource);
begin
FQuery := Query;
coInitialize(nil);
FDataSource := DataSource;
inherited Create(True);
FreeOnTerminate := False;
end;procedure TForm1.FormCreate(Sender: TObject);
begin
Q1 := TThreadQuery.Create(ADOQuery1, DataSource1); Q2 := TThreadQuery.Create(ADOQuery2, DataSource2);end;procedure TForm1.FormDestroy(Sender: TObject);
begin
Q1.Terminate; { 销毁之前终止线程执行 }
Q1.Destroy;
Q2.Terminate; { 销毁之前终止线程执行 }
Q2.Destroy;end;procedure TForm1.Button1Click(Sender: TObject);
begin
if Q1.Suspended then Q1.Resume else Q1.Suspend;
if Q2.Suspended then Q2.Resume else Q2.Suspend;
end;end.
感觉dragonki的方法才能达到要求~~
自己再顶一下~~
希望dragonki能帮忙
你可以用 ado 异步 fetch模式
withcsharp,能留个QQ号吗?详细聊聊异步同步~~