//------------------------------------------------------------
//      作者:曾慶順
//      模塊:系統數據備份窗口
//      時間：2002.09.17
//      功能介紹：
//-----------------------------------------------------------
unit sysbackup;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, ExtCtrls, DBTables, Db, Buttons,FileCtrl;

type
  TSysBackFrm = class(TForm)
    Panel1: TPanel;
    GroupBox1: TGroupBox;
    RB_DB: TRadioButton;
    RB_DBF: TRadioButton;
    RB_TXT: TRadioButton;
    Table1: TTable;
    Table2: TTable;
    BatchMove1: TBatchMove;
    BitBtn1: TBitBtn;
    BitBtn2: TBitBtn;
    Label1: TLabel;
    Label2: TLabel;
    CB_Delete: TCheckBox;
    procedure FormCreate(Sender: TObject);
    procedure BitBtn1Click(Sender: TObject);
  private
    { Private declarations }
    
    FDir:string;
    Function IsHaveDcid(pTable:TTable;pDcid:string):Boolean;
    Function IsHaveBlob(pTable:TTable):Boolean;
    Function ExecQuery(PQuery:TQuery;PSql:string):Boolean;
    //得到數據庫服務器日期
    Function GetDbServerDate(DBName:string):string;overload;
  public
    { Public declarations }
  end;

var
  SysBackFrm: TSysBackFrm;

implementation

{$R *.DFM}
uses xt_sjbf_frm_main;

procedure TSysBackFrm.BitBtn1Click(Sender: TObject);
var FTName:string;
    fsql:string;
begin
   xt_sjbf_main.qry_TB_XTGL_FACB.DisableControls;

   if RB_TXT.Checked then
   begin
     xt_sjbf_main.qry_TB_XTGL_FACB.First;
     while not xt_sjbf_main.qry_TB_XTGL_FACB.Eof do
     begin
        Table1.close;
        Table1.TableName:=xt_sjbf_main.qry_TB_XTGL_FACB.fieldbyname('BYWM').asstring;
        if IsHaveBlob(Table1) then
        begin
           if Application.MessageBox('要備份的表存在Blob或Memo字段,'+#13+' 不能'+
             '用文本的方式備份,'+#13+'  否則該表將不做備份,'+#13+'   是否選擇其他方'+
             '式?','警告',MB_OKCANCEL+MB_ICONSTOP) =ID_OK then exit;
           break;
        end;
        xt_sjbf_main.qry_TB_XTGL_FACB.Next;
     end;
   end;

   //設置備份方式為拷貝
   BatchMove1.Mode:=batCopy;
   table2.DatabaseName:=FDir;
   //計算要備份的表的個數
   FSql:='select count(*) from T_XTGL_FACB where FABH ='''+xt_sjbf_main.Edit_fabh.Text+'''';
   xt_sjbf_main.Query.close;
   xt_sjbf_main.Query.sql.Clear;
   
   if xt_sjbf_main.qry_TB_XTGL_FACB.Filtered then
     fsql:=fsql+ ' and ('+ xt_sjbf_main.qry_TB_XTGL_FACB.Filter+')';
   xt_sjbf_main.Query.sql.Add(fsql);

   xt_sjbf_main.Query.open;
   xt_sjbf_main.Query.First;

   //正式開始備份
   xt_sjbf_main.qry_TB_XTGL_FACB.First;
   while not xt_sjbf_main.qry_TB_XTGL_FACB.Eof do
   begin
      FTName:=xt_sjbf_main.qry_TB_XTGL_FACB.fieldbyname('BYWM').asstring;
      Table1.close;
      Table1.TableName:=FTName;
      table1.Filter:='';
      table1.Filtered:=false;
      //刪除數據時用
      fsql:='delete from '+FTName;
      //if IsHaveDcid(Table1,'DCID') then
      //begin
        //table1.Filter:='DCID='''+FCurrentDcid+'''';
        table1.Filtered:=true;
        //如果有DCID 則刪除數據時要過濾
        fsql:='delete from ' + FTName ;
      //end;

      Label2.Caption:=xt_sjbf_main.qry_TB_XTGL_FACB.fieldbyname('BZWM').asstring;
      self.update;

      Table2.close;
      if RB_DB.Checked then
      begin
        table2.TableName:=FTName+'.db';
        table2.TableType:=ttParadox;
      end
      else if RB_DBF.Checked then
      begin
        table2.TableName:=FTName+'.dbf';
        table2.TableType:=ttDBase;
      end
      else
      begin
        if IsHaveBlob(Table1) then
        begin
           xt_sjbf_main.qry_TB_XTGL_FACB.Next;
           continue;
        end;
        table2.TableName:=FTName+'.txt';
        table2.TableType:=ttASCII;
      end;
      try
         if table1.Active then table1.Active:=false;
         if table2.Active then table2.Active:=false;
         BatchMove1.Execute;
      except
        xt_sjbf_main.qry_TB_XTGL_FACB.EnableControls;
        Application.MessageBox('備份表數據失敗!','警告',MB_OK+MB_ICONSTOP);
        close;
        exit;
      end;
      //如果選中則刪除數據
      if CB_Delete.Checked then
      begin
        ExecQuery(xt_sjbf_main.Query,fsql);
      end;
      xt_sjbf_main.qry_TB_XTGL_FACB.Next;
      //

   end;
   xt_sjbf_main.qry_TB_XTGL_FACB.EnableControls;
   Application.MessageBox('備份表數據成功!','警告',MB_OK+MB_ICONEXCLAMATION);
   close;
end;

Function TSysBackFrm.IsHaveDcid(pTable:TTable;pDcid:string):Boolean;
var i:integer;
begin
    result:=false;
    if not pTable.Active then
    try
       pTable.Active:=true;
    except
       exit;
    end;
    for i:=0 to pTable.FieldCount - 1 do
    begin
      if pTable.Fields[i].FieldName = pDcid then
      begin
        result:=true;
        break;
      end;
    end;
end;
Function TSysBackFrm.IsHaveBlob(pTable:TTable):Boolean;
var i:integer;
begin
    result:=false;
    if not pTable.Active then
    try
       pTable.Active:=true;
    except
       result:=true;
       exit;
    end;
    for i:=0 to pTable.FieldCount - 1 do
    begin
      if (pTable.Fields[i].DataType=ftMemo) or (pTable.Fields[i].DataType=ftBlob) then
      begin
        result:=true;
        break;
      end;
    end;
end;
procedure TSysBackFrm.FormCreate(Sender: TObject);
begin
  //數據備份在當前目錄下\data子目錄
  Label2.Caption:='';
  FDir:=ExtractFilePath(ParamStr(0))+'data\'+GetDbServerDate('db_vipdl');
  if not DirectoryExists(FDir) then ForceDirectories(FDir);
  
end;



function TSysBackFrm.ExecQuery(PQuery: TQuery; PSql: string): Boolean;
begin
  Result:=true;
  PQuery.close;
  PQuery.sql.Clear;
  PQuery.Filtered:=false;
  PQuery.sql.add(PSql);
  try
    PQuery.ExecSQL;
  except
    Result:=false;
  end;
end;

function TSysBackFrm.GetDbServerDate(DBName: string): string;
var query:TQuery;
    Present: TDateTime;
    Year, Month, Day: Word;
    str:string;
begin
  try
      query:=TQuery.Create(nil);
  except
      exit;
  end;
  query.DatabaseName:=DBname;
  query.close;
  query.sql.Clear;
  query.sql.Add('select distinct sysdate from dual');
  try
     query.open;
  except
     exit;
  end;
  query.First;
  Present:=Query.Fields[0].AsDateTime;
  DecodeDate(Present, Year, Month, Day);
  str:=inttostr(year);
  if month<10 then str:=str+'0'+inttostr(month)
  else str:=str+inttostr(month);
  if day<10 then str:=str+'0'+inttostr(day)
  else str:=str+inttostr(day);
  result:=str;
  query.free;
end;

end.