修改虫虫的三层数据库类中的一个单元文件untRmoDbClient.pas

虫子的三层数据库类很好用，使用中发现一个小问题，就是当数据库字段较多时，如果DBGEID中只显示其中几列的话，在修改数据后移动到下一行进，会出错，无法更新数据，检查是生成的UPDATE语句有问题，没有在DBGRID中显示的列也生成进去了，并给了个‘’空值，刚好数据库设置了字段不能为空，就报错了，根据自己实用，修改如下

{******************************************************* 万剑修改 585行 20120420

单元名称：untRmoDbClient.pas 创建日期：2008-09-16 17:25:52 创建者马敏钊功能: 远程数据库客户端当前版本： v2.0.2

更新历史 v1.0 单元实现 v1.1 解决不支持自增长字段的问题 v1.2 解决id号必须是第1个字段的问题 v1.3 为增加速度，做缓冲不用每次生成语句，改变自动更新时导致filter属性暂用的方式 v1.4 在sabason 兄的热心帮助下，解决了流试传输存在的问题，大大提高了传输效率 20100413 v1.5 全面修改为支持高效率的UniDAC数据库驱动套件和ClientDataset (原来是ADO方式)支持所有主流数据库，大幅提高传输效率，且使用方法没有改变 v1.6 解决流传输存在的BUG ，修正最后一个字段为blob字段导致语句生成错误的BUG v1.7 增加服务端sys.ini文件配置客户端登陆权限，增加批量执行SQL语句接口 v1.8 增加服务端提供自动升级功能，可以升级多个文件或者目录，可选择强制升级或者客户端可选升级 v2.0 增加asio高性能 C++ 完成端口稳定库的封装支持 v2.1 增加存储过程调用的支持（参考静水流深的修改版本，在此表示感谢） v2.0.2 2011-04-20 统一和服务端的版本号，从v2.1修改为v2.0.2 由于MAX()方式获取数据记录当数据表内存在大量记录时会很慢，而且可能导致ID冲突，所以特，增加快速获取自增长ID的方式，客户端可配置是否使用这种方式 *******************************************************}

unit untRmoDbClient;

interface

uses Classes, UntsocketDxBaseClient, IdComponent, Controls, ExtCtrls, db, dbclient, midaslib;

type TConnthread = class; TSelectitems = class public Sql: string; end; TRmoClient = class(TAsioClient) private gLmemStream: TMemoryStream; FCachSQllst, FsqlLst: TStrings; //用来记录已经打开了的数据集以及对于的语句 FSqlPart1, FSqlPart2: string;

Fsn: Cardinal; FQryForID: TClientDataSet; FIsDisConn: boolean; //是否是自己手动断开连接的 Ftimer: TTimer; //连接保活器 FisConning: Boolean; //是否连接成功 //定时检查是否需要重连或者连接断开 procedure OnCheck(Sender: TObject); //检查是否连接存活 procedure checkLive;

procedure OnBeginPost(DataSet: TDataSet); procedure OnBeforeDelete(DataSet: TDataSet); function GetSvrmaxID(Iidname, itablename: string): integer; public IsSpeedGetID: Boolean; //是否使用高速方式获取自增长ID IsInserIDfield: boolean; //是否插入语句支持ID字段自增长不允许插入该字段默认是false FLastInsertID: Integer; //insert语句时返回插入记录的自增字段的值

//连接服务端 function ConnToSvr(ISvrIP: ansistring; ISvrPort: Integer = 9988; Iacc: ansistring = ''; iPsd: ansistring = ''): boolean; //断开连接 procedure DisConn; //重新连接新的IP function ReConn(ISvrIP: ansistring; IPort: Integer = -1; Iacc: ansistring = ''; iPsd: ansistring = ''): boolean;

//将post模式变更为更新语句到远端执行 procedure ReadySqls(IAdoquery: TClientDataSet);

//执行一条语句 function ExeSQl(ISql: ansistring): Integer; //打开一个过数据集 function OpenAndataSet(ISql: ansistring; IADoquery: TClientDataSet): Boolean; //批量提交语句立即执行所传入的语句列表 function BathExecSqls(IsqlList: TStrings): Integer; //执行一个存储过程 //参数执行语句是否需要返回数据集 function ExecProc(iSQL: ansistring; IsBackData: boolean; cds: TClientDataSet = nil): Boolean;

//检查升级 procedure CheckUpdate;

procedure OnCreate; override; procedure OnDestory; override; end;

TConnthread = class(TThread) public Client: TRmoClient; procedure execute; override; end;

var //远程连接控制对象 Gob_RmoCtler: TRmoClient; GCurrVer: integer = 1; //当前程序升级版本号

implementation

uses untfunctions, sysUtils, UntBaseProctol, IniFiles, ADOInt, Variants, Windows, untASIOSvr;

function TRmoClient.BathExecSqls(IsqlList: TStrings): Integer; var IErr: ansistring; llen, i: Integer; ls: TMemoryStream; begin //批量执行SQL语句 ls := TMemoryStream.Create; IsqlList.SaveToStream(ls); EnCompressStream(ls); llen := 4 + 4 + ls.Size; SendAsioHead(llen); WriteInteger(110); SendZIpStream(ls, Self, true); llen := ReadInteger(); if llen = -1 then begin llen := ReadInteger(); IErr := ReadStr(llen); // IsqlList.SaveToFile('D:\2.txt'); raise Exception.Create(IErr); end else begin Result := llen; end; end;

procedure TRmoClient.checkLive; begin try if IsConnected then begin SendAsioHead(4); if WriteInteger(4) <> 4 then begin if FIsDisConn = False then FisConning := False; end; end else begin if FIsDisConn = False then FisConning := False; end;

except if FIsDisConn = False then FisConning := False; end; end;

procedure TRmoClient.CheckUpdate; var i, lstrlrn, illen: Integer; li, lr, lm: integer; ls, lspath, lflst: ansistring; lspit: TStringList; begin SendAsioHead(4); WriteInteger(9998); lr := ReadInteger; if lr > 0 then begin lspit := TStringList.Create; lr := ReadInteger; //ver lm := ReadInteger; lstrlrn := Readinteger; lspath := ReadStr(lstrlrn); lstrlrn := Readinteger; ls := ReadStr(lstrlrn); li := ReadInteger; lflst := ReadStr(li); if lr > GCurrVer then begin lspit.Add(IntToStr(lm)); lspit.Add(ls); //后台下载下来 GetEveryWord(lflst, '|'); lspit.Add(IntToStr(GlGetEveryWord.Count));

for i := 0 to GlGetEveryWord.Count - 1 do begin // Iterate ls := GlGetEveryWord[i]; illen := Length(ls); SendAsioHead(8 + illen); SendHead(9997); Writeinteger(illen); Write(ls); li := ReadInteger; if li = 1 then begin ls := StringReplace(GlGetEveryWord[i], lspath, '', []); ls := GetCurrPath + ls; ForceDirectories(ExtractFilePath(ls)); GetZipFile(ls); lspit.Add(ls); end; end; // for lspit.SaveToFile('up.cfg'); lspit.Free; WinExec(pansichar('up.exe ' + ExtractFileName(ParamStr(0))), SW_SHOW); end; end; end;

function TRmoClient.ConnToSvr(ISvrIP: ansistring; ISvrPort: Integer = 9988; Iacc: ansistring = ''; iPsd: ansistring = ''): boolean; var i: Integer; ls: ansistring; begin Result := True; if (IsConnected = false) or (FHost <> ISvrIP) or (FPort <> ISvrPort) then begin if IsConnected then DisConn; FHost := ISvrIP; FPort := ISvrPort; Facc := Iacc; Fpsd := iPsd; FIsDisConn := False; try Result := Connto(FHost, FPort); except Result := False; FIsDisConn := False; end; if Result = True then begin // SendHead(CTSLogin); // WriteInteger(CClientID); // if ReadInteger <> STCLogined then // Result := False; ls := format('%s|%s', [Iacc, Str_Encry(iPsd, 'rmo')]); Writeinteger(Length(ls)); Write(ls); if ReadInteger <> STCLogined then begin Result := False; DisConn; FisConning := false; Exit; end; FisConning := True; FIsDisConn := False; Ftimer.Enabled := True; end; end; end;

procedure TRmoClient.DisConn; begin try CloseConn; // if IsConnected then // DisConn; except end; FIsDisConn := True; end;

{ TConnthread }

procedure TConnthread.execute; begin try if Client.ConnToSvr(Client.FHost, Client.FPort, Client.Facc, Client.Fpsd) then begin Client.FisConning := True; end; finally Client.Ftimer.Tag := 0; end; end;

function StreamToVarArray(const S: TStream): Variant; var P: Pointer; C: Integer; L: Integer; begin S.Position := 0; C := S.Size; Result := VarArrayCreate([1, C], varByte); L := Length(Result); if L <> 0 then ; P := VarArrayLock(Result); try S.Read(P^, C); finally VarArrayUnlock(Result); end; end;

procedure VarArrayToStream(const V: Variant; S: TStream); var P: Pointer; C: Integer; begin if not VarIsArray(V) then raise Exception.Create('Var is not array'); if VarType(V[1]) <> varByte then raise Exception.Create('Var array is not blob array'); C := VarArrayHighBound(V, 1) - VarArrayLowBound(V, 1) + 1; if not (C > 0) then Exit;

P := VarArrayLock(V); try S.Write(P^, C * SizeOf(Byte)); S.Position := 0; finally VarArrayUnLock(V); end; end;

function DatasetFromStream(Idataset: TClientDataSet; Stream: TMemoryStream): boolean; var RS: Variant; begin Result := false; if Stream.Size < 1 then Exit; try Idataset.Data := StreamToVarArray(Stream); Result := true; finally; end;

end;

function TRmoClient.ExecProc(iSQL: ansistring; IsBackData: boolean; cds: TClientDataSet = nil): Boolean; var nReturn, i: Integer; sErr: ansistring; stmp: ansistring; begin //在firebird中 //执行存储过程 //sql = 'Execute procedure ' + ProcName + '(' + Format(ParamsValues, args) + ')'; //执行返回数据集的存储过程 //sql = 'select * from ' + ProcName + '(' + Format(ParamsValues, args) + ')'; Result := True; FLastInsertID := -1; if not IsBackData then begin //执行存储过程 SendAsioHead(4 + 4 + length(iSQL)); WriteInteger(1010); WriteInteger(Length(iSQL)); Write(iSQL); nReturn := ReadInteger(); if nReturn = -1 then begin nReturn := ReadInteger(); sErr := ReadStr(nReturn); Result := False; raise Exception.Create(Format('错误: %s', [sErr])); end else begin //{ TODO -owshx -c : 2010-11-10 下午 02:26:32 } //stmp := ReadStr(ReadInteger()); //返回output参数值 end; end else begin //有返回数据集 SendAsioHead(4 + 4 + length(iSQL)); WriteInteger(1011); //从存储过程返回数据集 WriteInteger(Length(iSQL)); Write(iSQL); nReturn := ReadInteger(); if nReturn = -1 then begin nReturn := ReadInteger(); sErr := ReadStr(nReturn); raise Exception.Create(Format('执行语句<%s>时发生错误。', [sErr])); end else begin if glmemStream = nil then glmemStream := TMemoryStream.Create else glmemStream.clear; GetZipStream(glmemStream, self); if Assigned(cds) then DatasetFromStream(cds, glmemStream) else begin raise Exception.Create('返回的数据集没有指定载体。'); Result := False; end; end; end;

end;

function TRmoClient.ExeSQl(ISql: ansistring): Integer; var llen, i: Integer; begin llen := Length(ISql); SendAsioHead(8 + llen); WriteInteger(1); WriteInteger(llen); Write(ISql); llen := ReadInteger(); if llen = -1 then begin llen := ReadInteger(); ISql := ReadStr(llen); raise Exception.Create(ISql); end else begin Result := llen; end; end;

//------------------------------------------------------------------------------ // 数据post时自动更新服务端 2009-05-22 马敏钊 // 要求表必须有id号而且必须是第一个字段 //------------------------------------------------------------------------------

var lglst: Tstrings;

function TRmoClient.GetSvrmaxID(Iidname, itablename: string): integer; var llen, i: Integer; ISql: string; begin if IsSpeedGetID then begin ISql := Format('%s|%s', [Iidname, itablename]); llen := Length(ISql); SendAsioHead(8 + llen); WriteInteger(7); WriteInteger(llen); Write(ISql); llen := ReadInteger(); Result := ReadInteger; if llen = -1 then begin llen := ReadInteger(); ISql := ReadStr(llen); raise Exception.Create(ISql); end; end else begin //如果需要ID字段自动获取 if FQryForID = nil then FQryForID := TClientDataSet.Create(nil); // 获取ID OpenAndataSet(Format('select max(%s) as myid from %s', [Iidname, itablename]), FQryForID); // Result := FQryForID.FieldByName('myid').AsInteger + 1; end; end;

procedure TRmoClient.OnBeforeDelete(DataSet: TDataSet); var I: Integer; lsql: string; Result, ltablename: string; Lkey, lvalue: string; Lindex: integer; begin

//获取表名 i := FsqlLst.IndexOf(IntToStr(integer(DataSet))); if i > -1 then lsql := LowerCase(TSelectitems(FsqlLst.Objects[i]).Sql); // LowerCase(DataSet.Filter); if Pos('select', lsql) > 0 then begin if lglst = nil then lglst := TStringList.Create; GetEveryWord(lsql, lglst, ' '); for i := 0 to lglst.Count - 1 do if lglst.Strings[i] = 'from' then begin Lindex := i; Break; end; if Lindex < 2 then ExceptTip('SQL语句错误！'); ltablename := ''; for i := Lindex + 1 to lglst.Count - 1 do if lglst.Strings[i] <> '' then begin ltablename := lglst.Strings[i]; Break; end; if ltablename = '' then ExceptTip('SQL语句错误！'); end else ExceptTip('无法自动提交，请先执行select'); //获取方法 with DataSet.Fields do begin Result := 'delete from ' + ltablename + Format(' where %s=%d', [Fields[0].FieldName, Fields[0].AsInteger]); ExeSQl(Result); end; end;

procedure TRmoClient.OnBeginPost(DataSet: TDataSet); var I, n: Integer; lsql, lBobName: string; Result, FtableName: string; Lkey, lvalue: string; Lindex: integer; LblobStream: TStream; begin //获取表名 i := FsqlLst.IndexOf(IntToStr(integer(DataSet))); if i > -1 then lsql := LowerCase(TSelectitems(FsqlLst.Objects[i]).Sql); // LowerCase(DataSet.Filter); if Pos('select', lsql) > 0 then begin if lglst = nil then lglst := TStringList.Create; GetEveryWord(lsql, lglst, ' '); for i := 0 to lglst.Count - 1 do if lglst.Strings[i] = 'from' then begin Lindex := i; Break; end; if Lindex < 2 then ExceptTip('SQL语句错误！'); FtableName := ''; for i := Lindex + 1 to lglst.Count - 1 do if lglst.Strings[i] <> '' then begin FtableName := lglst.Strings[i]; Break; end; if FtableName = '' then ExceptTip('SQL语句错误！'); end else ExceptTip('无法自动提交，请先执行select');

//获取方法 case TClientDataSet(DataSet).State of // dsinsert: begin with DataSet.Fields do begin //如果第一个字段为只读，说明是自增长ID字段改掉它 if Fields[0].ReadOnly = true then begin // IsInserIDfield := True; // 要你插入自增长字段干机八 Fields[0].ReadOnly := False; end; if DataSet.State = dsInsert then begin //------------------------------------------------------------------------------ // 更换为通过服务端获取ID 2011-4-20 10:46:02 马敏钊 //------------------------------------------------------------------------------ DataSet.Fields[0].AsInteger := GetSvrmaxID(DataSet.Fields[0].FieldName, FtableName); end; //IsInserIDfield:=True;//万剑修改 2012 04 20 //是否插入语句支持ID字段自增长不允许插入该字段默认是false if IsInserIDfield then begin n := 0; // end else n := 1; FSqlPart1 := 'insert into ' + FtableName + '('; FSqlPart2 := ''; for i := n to count - 1 do begin if (fields[i].IsNull) or (trim(fields[i].AsString) = '') then continue; //终止循环 //如果有blob字段则跳过 if Fields[i].DataType in [ftBlob] then begin LblobStream := TMemoryStream.Create; TBlobField(Fields[i]).SaveToStream(LblobStream); EnCompressStream(TMemoryStream(LblobStream)); lBobName := Fields[i].FieldName; //------------------------------------------------------------------------------ // 如果是最后一个字段则跳过之前去掉上次生成的，号 2010-04-21 马敏钊 //------------------------------------------------------------------------------ if i = count - 1 then begin if FSqlPart1[length(FSqlPart1) - 1] = ',' then begin FSqlPart1 := copy(FSqlPart1, 1, length(FSqlPart1) - 1); FSqlPart2 := copy(FSqlPart2, 1, length(FSqlPart2) - 1); end; end; Continue; end;

FSqlPart1 := FSqlPart1 + ifthen(i = n, '', ',') + Fields[i].FieldName; case Fields[i].DataType of ftCurrency, ftBCD, ftWord, ftFloat, ftBytes: FSqlPart2 := FSqlPart2 + ifthen(i = n, '', ',') + ifthen(Fields[i].AsString = '', '0', Fields[i].AsString); ftBoolean, ftSmallint, ftInteger: FSqlPart2 := FSqlPart2 + ifthen(i = n, '', ',') + IntToStr(Fields[i].AsInteger); ftDate, ftDateTime: if Fields[i].AsString = '' then FSqlPart2 := FSqlPart2 + ifthen(i = n, '', ',') + 'null' else FSqlPart2 := FSqlPart2 + ifthen(i = n, '', ',') + '''' + Fields[i].AsString + '''' // Modified by qnaqbgss 2010/9/11 17:56:49 else FSqlPart2 := FSqlPart2 + ifthen(i = n, '', ',') + '''' + Fields[i].AsString + ''''; end; end; Result := FSqlPart1 + ') values (' + FSqlPart2 + ')'; end; end; dsEdit: begin with DataSet.Fields do begin Result := 'Update ' + FtableName + ' Set '; for I := 0 to count - 1 do begin // Iterate if I = 0 then begin Lkey := Fields[i].FieldName; lvalue := Fields[i].AsString; Continue; end; if (fields[i].IsNull) or (trim(fields[i].AsString) = '') then begin if i = count - 1 then begin // 这里是我加进去的万剑 20120420 Result := copy(Result, 1, length(Result) - 1); end; continue; end;

//如果有blob字段则跳过 if Fields[i].DataType in [ftBlob] then begin LblobStream := TMemoryStream.Create; TBlobField(Fields[i]).SaveToStream(LblobStream); EnCompressStream(TMemoryStream(LblobStream)); lBobName := Fields[i].FieldName; //------------------------------------------------------------------------------ // 如果是最后一个字段则跳过之前去掉上次生成的，号 2010-04-21 马敏钊 //------------------------------------------------------------------------------ if i = count - 1 then begin Result := copy(Result, 1, length(Result) - 1); end; Continue; end;

Result := Result + Fields[i].FieldName + '='; case Fields[i].DataType of // ftCurrency, ftBCD, ftWord: Result := Result + Fields[i].AsString; ftFloat: Result := Result + Fields[i].AsString; ftBytes, ftSmallint, ftInteger: Result := Result + IntToStr(Fields[i].AsInteger); ftBoolean:Result := Result +Booltostr(fields[i].AsBoolean,true); ftDate, ftDateTime: if Fields[i].AsString = '' then result := Result + 'null' else result := Result + '''' + Fields[i].AsString + '''' // Modified by qnaqbgss 2010/9/11 17:57:14 else Result := Result + '''' + Fields[i].AsString + ''''; end; // case if i <> Count - 1 then Result := Result + ','; end; // for Result := Result + Format(' where %s=%s', [Lkey, lvalue]); end; // with end; end; // case ExeSQl(Result); //如果有blob字段则追加写入 if LblobStream <> nil then begin lsql := format('update %s set %s=:%s where %s=%d', [FtableName, lBobName, 'Pbob' , DataSet.Fields[0].FieldName, DataSet.Fields[0].AsInteger]); SendAsioHead(8 + length(lsql) + 4 + LblobStream.Size); WriteInteger(6); WriteInteger(length(lsql)); Write(lsql); WriteStream(LblobStream); end; end;

procedure TRmoClient.OnCheck(Sender: TObject); begin if TTimer(sender).tag = 0 then begin if ((IsConnected = false) or (FisConning = false)) and (FIsDisConn = false) then begin TTimer(sender).tag := 1; with TConnthread.Create(True) do begin FreeOnTerminate := True; Client := Self; Resume; end; end else begin checkLive; end; end; end;

procedure TRmoClient.OnCreate; begin inherited; IsSpeedGetID := True; FCachSQllst := THashedStringList.Create; Ftimer := TTimer.Create(nil); Ftimer.OnTimer := OnCheck; Ftimer.Interval := 3000; Ftimer.Enabled := False; Ftimer.Tag := 0; FisConning := false; FIsDisConn := False; FsqlLst := THashedStringList.Create; gLmemStream := TMemoryStream.Create; end;

procedure TRmoClient.OnDestory; begin inherited; FCachSQllst.Free; if FQryForID <> nil then FQryForID.Free; Ftimer.Free; FsqlLst.Free; gLmemStream.Free; end;

function TRmoClient.OpenAndataSet(ISql: ansistring; IADoquery: TClientDataSet): Boolean; var llen, i: Integer; ls: ansistring; Lend: integer; Litem: TSelectitems; begin inc(Fsn); Lend := 0; ls := ISql; llen := length(isql); SendAsioHead(8 + llen); WriteInteger(2); WriteInteger(llen); Write(ISql); llen := ReadInteger(); if llen = -1 then begin llen := ReadInteger(); ISql := ReadStr(llen); raise Exception.Create(ISql); end else begin //记录着是否可以自动保存 i := FsqlLst.IndexOf(IntToStr(integer(IADoquery))); if i = -1 then begin Litem := TSelectitems.Create; FsqlLst.AddObject(IntToStr(integer(IADoquery)), Litem); end else Litem := TSelectitems(FsqlLst.Objects[i]); Litem.Sql := ISql; //记录一下 ReadySqls(IADoquery); if llen = 1 then begin if gLmemStream = nil then gLmemStream := TMemoryStream.Create; GetZipStream(gLmemStream, self); DatasetFromStream(IADoquery, gLmemStream); end else begin ISql := GetCurrPath + GetDocDate + GetDocTime + IntToStr(Fsn); GetZipFile(ISql); IADoquery.LoadFromFile(ISql); DeleteFile(pchar(ISql)); end; Result := True; end; end;

procedure TRmoClient.ReadySqls(IAdoquery: TClientDataSet); begin IAdoquery.BeforePost := OnBeginPost; IAdoquery.BeforeDelete := OnBeforeDelete; end;

function TRmoClient.ReConn(ISvrIP: ansistring; IPort: Integer = -1; Iacc: ansistring = ''; iPsd: ansistring = ''): boolean; begin Result := False; if IsLegalIP(ISvrIP) then begin Result := ConnToSvr(ISvrIP, IfThen(IPort = -1, FPort, IPort), iacc, ipsd); end; end;

end.

posted on 2012-12-25 23:41 万剑阅读(713) 评论(0) 编辑收藏举报