Delphi-双色球分析软件(1)

有一段时间没正经的用delphi了，前两天下载了Delphi2010，用它来找找Delphi的感觉，把写的一些东西共享出来，大家共同学习一下，呵呵。

我想做一个双色球的分析软件，以下是其中实现的部分类的单元文件，其他文件后续一点一点的补齐，有不妥的地方，希望大家指正，谢谢啦！

在使用Delphi2010是，发现个问题，在用show函数调用窗体时，主窗口总是在子窗口的下面。

{工具类单元，包括一些用到的辅助类定义}

unit uCustomUtils;

interface

uses
  Classes;

type
  TLottery = packed record
   {红球集合}
    RedBalls: TStringList;
    {篮球}
    BlueBall: string;
    {开奖期 }
    Period: string;
    {开奖时间}
    Time: string;
    {奇偶数比}
    OddEvenCompare: string;
    {大小比}
    BigSmallCompare: string;
    {和值}
    Sum: string;
  end;
  pLottery = ^TLottery;

implementation

end.

{数据库辅助单元，通过这个类去与数据库打交道,因为当前用到的是Access数据库，}

{所以继承了一个Access的类，其他数据库，可以再另行实现}

unit uDBHelper;

interface

uses
  Classes, ADODB, SysUtils, Windows,

  uCustomUtils;

const
  CONNECTION_STRING_ACCESS = ‘Provider=Microsoft.Jet.OLEDB.4.0;Data Source=%s;Persist Security Info=False’;

type
  TDBHelper = class
  private
    FDBFilePath: string;
    FCommandText: string;
    FConnection: TADOConnection;
  public
    {执行Insert,Delete,Update操作}
    procedure Execute; virtual; abstract;
    {执行select操作}
    procedure SelectExecute; virtual; abstract;
    {打开数据库连接}
    procedure Open; virtual; abstract;
    {关闭数据库连接}
    procedure Close; virtual; abstract;

    {构造函数}
    constructor Create(dbfilePath: string); virtual;
    {析构函数}
    destructor Destory; virtual;

  public
    property DBFilePath: string read FDBFilePath;
    property CommandText: string read FCommandText write FCommandText;
  end;

  TAccessHelper = class(TDBHelper)
  private
    FLotterys: TList;
  public
    procedure Execute; override;
    procedure SelectExecute; override;
    procedure Open; override;
    procedure Close; override;

    constructor Create(dbfilePath: string); override;
    destructor Destroy; override;
  end;

implementation

{ TDBHelper }

constructor TDBHelper.Create(dbfilePath: string);
begin
  FConnection := TADOConnection.Create(nil);
  FDBFilePath := dbfilePath;
end;

destructor TDBHelper.Destory;
begin
  FreeAndNil(FConnection);
end;

{ TAccessHelper }

procedure TAccessHelper.Close;
begin
  if FConnection.Connected then
    FConnection.Close;
end;

constructor TAccessHelper.Create(dbfilePath: string);
var
  dbfile: string;
begin
  inherited;
  FLotterys := TList.Create;
  try
    dbfile := Format(CONNECTION_STRING_ACCESS, [FDBFilePath]);
    FConnection.ConnectionString := dbfile;
    FConnection.LoginPrompt := False;
    FConnection.Open;
  except
    on E:Exception do
      MessageBox(0, Pchar(‘Open Database error.’), Pchar(”), MB_OK+MB_ICONINFORMATION)
  end;
end;

destructor TAccessHelper.Destroy;
begin
  FConnection.Close;
  FreeAndNil(FLotterys);
  inherited;
end;

procedure TAccessHelper.Execute;
var
  qry: TADOQuery;
begin
  qry := TADOQuery.Create(nil);
  try
    with qry do
    begin
      Connection := FConnection;
      SQL.Clear;
      SQL.Add(FCommandText);
      ExecSQL;
    end;
  finally
    qry.Free;
  end;
end;

procedure TAccessHelper.Open;
begin
  FConnection.Open;
end;

procedure TAccessHelper.SelectExecute;
var
  qry: TADOQuery;
  item: TLottery;
  i: Integer;
  strRed: string;
begin
  qry := TADOQuery.Create(nil);
  try
    with qry do
    begin
      Connection := FConnection;
      SQL.Clear;
      SQL.Add(FCommandText);
      Open;

      //遍历记录部分
      First;
      while not Eof do
      begin
        item.Period := FieldByName(‘period’).AsString;
        item.BlueBall := FieldByName(‘blue’).AsString;
        item.Time := FieldByName(‘time’).AsString;
        item.OddEvenCompare := FieldByName(‘oddeven’).AsString;
        item.BigSmallCompare := FieldByName(‘bigsmall’).AsString;
        item.Sum := FieldByName(‘sum’).AsString;
        item.RedBalls := TStringList.Create;
        for i := 1 to 6 do
        begin
          strRed := ‘red’+IntToStr(i);
          item.RedBalls.Add(FieldByName(strRed).AsString);
        end;
        FLotterys.Add(@item);
        Next;
      end;
    end;
  finally
    qry.Free;
  end;
end;

end.

{彩票的处理单元，包括录入，查询}

unit uLotterys;

interface

uses
  Classes, SysUtils,

  uCustomUtils, uDBHelper;

type
  TLotteryManager = class
  private
    FLotterys: TList;
    FDBHelper: TAccessHelper;

    {格式化TLottery类型为字符串}
    {%s,%s,%s…}
    {期 ,时间,红球,蓝球,奇偶比,大小比,和值}
    function FormatLottery(const lottery: TLottery): string;
  public
    constructor Create(DBFilePath: string);
    destructor Destory;

    {添加单独一个中奖记录}
    procedure ImportSingle(const lottery: TLottery; const tableName: string);
    {批量添加中奖纪录}
    {filePath: 要批量导入的数据文件}
    procedure ImportMultiple(const items: TList; const tabelName: string);
    {查询一定数量的中奖记录, 默认搜索全部s}
    procedure Search( const tableName: string; const count: Integer = 0);

    {现在只用于在查询返回结果时使用}
    property Lotterys: TList read FLotterys;
  end;

implementation

{ TLotteryManager }

constructor TLotteryManager.Create(DBFilePath: string);
begin
  FLotterys := TList.Create;
  FDBHelper := TAccessHelper.Create(DBFilePath);
end;

destructor TLotteryManager.Destory;
begin
  FreeAndNil(FDBHelper);
  FreeAndNil(FLotterys);
end;

function TLotteryManager.FormatLottery(const lottery: TLottery): string;
const
  FORMAT_STR = ‘%s,%s’;
var
  msg: string;
  i: Integer;
begin
  msg := lottery.Period;
  msg := Format(FORMAT_STR, [msg, lottery.Time]);
  for i := 0 to 5 do
  begin
    msg := Format(FORMAT_STR, [msg, lottery.RedBalls[i]]);
  end;
  msg := Format(FORMAT_STR, [msg, lottery.BlueBall]);
  msg := Format(FORMAT_STR, [msg, lottery.OddEvenCompare]);
  msg := Format(FORMAT_STR, [msg, lottery.BigSmallCompare]);
  msg := Format(FORMAT_STR, [msg, lottery.Sum]);
end;

procedure TLotteryManager.ImportMultiple(const items: TList; const tabelName: string);
var
  item: pLottery;
  i: Integer;
begin
  for i := 0 to items.Count – 1 do
  begin
    item := pLottery(items.Items[i]);
    ImportSingle(item^, tabelName);
  end;
end;

procedure TLotteryManager.ImportSingle(const lottery: TLottery; const tableName: string);
const
  INSERT_STR = ‘insert into [%s] values(%s)’;
var
  cmdText: string; 
begin
  cmdText := Format(INSERT_STR, [tableName, FormatLottery(lottery)]);
  FDBHelper.CommandText := cmdText;
  FDBHelper.Execute;
end;

procedure TLotteryManager.Search(const tableName: string; const count: Integer);
const
  SELECT_STR = ‘select %s * from [%s]’;
var
  cmdText: string; 
begin
  if count = 0 then
  begin
    cmdText := Format(SELECT_STR, [”,tableName]);
  end
  else begin
    cmdText := Format(SELECT_STR, [IntToStr(count), tableName]);
  end;
  FDBHelper.CommandText := cmdText;
  FDBHelper.Open;
end;

end.

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