我可以在Delphi2010中从wsdl导入的类派生的类上实现更改跟踪吗?
有没有一种方法可以在不重写基类的getter和setter的情况下在派生类中实现更改跟踪?我可以在Delphi2010中从wsdl导入的类派生的类上实现更改跟踪吗?,delphi,oop,design-patterns,delphi-2010,Delphi,Oop,Design Patterns,Delphi 2010,有没有一种方法可以在不重写基类的getter和setter的情况下在派生类中实现更改跟踪? 我正在开发一个基于实体框架的多层项目,数据访问和业务逻辑最终转移到基于C#的服务器应用程序。(数据访问已迁移)客户端位于Delphi 2010中。 我使用数据传输对象在客户机和服务器之间传递信息,但是有必要从Delphi实现我自己的更改跟踪。我最初是通过从wsdl中的DTO继承并“覆盖”getter和setter实现的。 wsdl导入中的基类(对此没有实际控制): 典型的setter方法: procedu
我正在开发一个基于实体框架的多层项目,数据访问和业务逻辑最终转移到基于C#的服务器应用程序。(数据访问已迁移)客户端位于Delphi 2010中。
我使用数据传输对象在客户机和服务器之间传递信息,但是有必要从Delphi实现我自己的更改跟踪。我最初是通过从wsdl中的DTO继承并“覆盖”getter和setter实现的。 wsdl导入中的基类(对此没有实际控制): 典型的setter方法:
procedure TDtoCONTAINER_JNL.SetJNL_DATE(const value : TDateTime);
begin
ChangedProperties:= DtoGenerics.ChangeTracker('JNL_DATE', value, inherited JNL_DATE, self.IsLoaded, ChangedProperties);
inherited JNL_DATE := DtoGenerics.GetXsDate(value);
end;
function TDtoCONTAINER_JNL.GetJNL_DATE : TDateTime;
begin
Result := DtoGenerics.GetDate(inherited JNL_DATE);
end;
典型的吸气剂法:
procedure TDtoCONTAINER_JNL.SetJNL_DATE(const value : TDateTime);
begin
ChangedProperties:= DtoGenerics.ChangeTracker('JNL_DATE', value, inherited JNL_DATE, self.IsLoaded, ChangedProperties);
inherited JNL_DATE := DtoGenerics.GetXsDate(value);
end;
function TDtoCONTAINER_JNL.GetJNL_DATE : TDateTime;
begin
Result := DtoGenerics.GetDate(inherited JNL_DATE);
end;
每当设置属性时,更改跟踪器都会将此属性名称添加到已更改属性的列表中,以返回到服务器。这使得update语句具有针对性和高效性。问题是,每个getter/setter实际上都使派生类与基类不兼容,即多态性被破坏,强制转换不再按预期工作。上面的类是根据相应的数据库表/实体从C#中的t4模板生成的,因此更改100多个类应该不是问题。
有人对此有经验吗?
如有任何建议,将不胜感激 编辑 Wsdl导入器主要由常量组成,这些常量使用字符串格式或类似的格式来创建复杂类型的Delphi等价物。我做了以下更改,使用类似的常量名称来轻松识别我的更改,以及将它们放置在与现有代码相关的位置。 理想情况下,我会完全摆脱继承,只在wsdl中使用我的类的修改版本,因为即使我将修改后的Tdto强制转换回Dto类,我仍然无法提交修改后的Tdto,因为web服务会使用类似“expecting DtoObject,but get undtoUnit.tdtobject”的消息拒绝它。 因此,我使用继承来处理ArrayOfObjects到TList之间的转换,反之亦然。 以下是我记忆中最清楚的变化:
// In WSDLImpConst
// I changed sRemoteClassDeclPas constant value of 'private' to 'proctected'
// Then I added these after SUnitInit
sTrackerDec = sTrackerProcPrefix+ sTrackerProcArgs + sLineBreak;
sTrackerProc = sTrackerDec + 'begin' + sLineBreak +
' Result:= nProps;' + sLineBreak +
' if (_loaded) and (oVal <> pVal) then' + sLineBreak +
' begin ' + sLineBreak +
' Result := TrackChange(pName, nProps);' + sLineBreak +
' end;' + sLineBreak +
'end;' + sLineBreak ;
sTracker2Dec = sTrackerProcPrefix+ sTracker2ProcArgs + sLineBreak;
sTracker2Proc = sTracker2Dec + 'begin' + sLineBreak +
' Result:= nProps;' + sLineBreak +
' if (_loaded) and (oVal <> DateTimeToXSDateTime(pVal)) then' + sLineBreak +
' begin ' + sLineBreak +
' Result := TrackChange(pName, nProps);' + sLineBreak +
' end;' + sLineBreak +
'end;' + sLineBreak ;
sTracker3Dec = sTrackerProcPrefix+ sTracker3ProcArgs + sLineBreak;
sTracker3Proc = sTracker3Dec + 'begin' + sLineBreak +
' Result:= nProps;' + sLineBreak +
' if nProps = '''' then' + sLineBreak +
' nProps := pName' + sLineBreak +
' else' + sLineBreak +
' nProps := pName + '','' + nProps;' + sLineBreak +
' Result:= nProps;' + sLineBreak +
'end;' + sLineBreak ;
sTracker4Dec = sTrackerProcPrefix+ sTracker4ProcArgs + sLineBreak;
sTracker4Proc = sTracker4Dec + 'begin' + sLineBreak +
' Result:= nProps;' + sLineBreak +
' if (_loaded) and (oVal <> pVal) then' + sLineBreak +
' begin ' + sLineBreak +
' Result := TrackChange(pName, nProps);' + sLineBreak +
' end;' + sLineBreak +
'end;'
//Added my own setters:
sRemoteClassSetterImplPas = 'procedure %0:s.Set%1:s(const A%2:s: %2:s);' + sLineBreak +
'begin' + sLineBreak +
' F%1:s := A%2:s;' + sLineBreak +
'end;' + sLineBreak;
sRemoteClassSetterImplPas2= 'procedure %0:s.Set%1:s(const A%2:s: %2:s);' + sLineBreak +
'begin' + sLineBreak +
' F%1:s := A%2:s;' + sLineBreak +
' F%1:s_Specified := True;' + sLineBreak +
'end;' + sLineBreak;
sRemoteClassSetterImplPas3 = 'procedure %0:s.Set%1:s(const A%2:s: %2:s);' + sLineBreak +
'begin' + sLineBreak +
' ChangedProperties:= TrackChange(''%1:s'', A%2:s, F%1:s, self.IsLoaded, ChangedProperties);' + sLineBreak +
' F%1:s := A%2:s;' + sLineBreak +
'end;' + sLineBreak;
sRemoteClassSetterImplPas4 = 'procedure %0:s.Set%1:s(const A%2:s: %2:s);' + sLineBreak +
'begin' + sLineBreak +
' ChangedProperties:= TrackChange(A%2:s, F%1:s, ''%1:s'', self.IsLoaded, ChangedProperties);' + sLineBreak +
' F%1:s := A%2:s;' + sLineBreak +
'end;' + sLineBreak;
// And for indexed properties
sRemoteClassSetterImplPasIdx2=
'procedure %0:s.Set%1:s(Index: Integer; const A%2:s: %2:s);' + sLineBreak +
'begin' + sLineBreak +
' F%1:s := A%2:s;' + sLineBreak +
' F%1:s_Specified := True;' + sLineBreak +
'end;' + sLineBreak;
sRemoteClassSetterImplPasIdx3 =
'procedure %0:s.Set%1:s(Index: Integer; const A%2:s: %2:s);' + sLineBreak +
'begin' + sLineBreak +
' ChangedProperties:= TrackChange(''%1:s'', A%2:s, F%1:s, self.IsLoaded, ChangedProperties);' + sLineBreak +
' F%1:s := A%2:s;' + sLineBreak +
'end;' + sLineBreak;
sRemoteClassSetterImplPasIdx4 =
'procedure %0:s.Set%1:s(Index: Integer; const A%2:s: %2:s);' + sLineBreak +
'begin' + sLineBreak +
' ChangedProperties:= TrackChange(A%2:s, F%1:s, ''%1:s'', self.IsLoaded, ChangedProperties);' + sLineBreak +
' F%1:s := A%2:s;' + sLineBreak +
'end;' + sLineBreak;
// Added these before the SImplDecl constant:
sIntfFactoryDecl = '_di_%0:s Get%0:s(bool useWSDL=false, AnsiString addr="", THTTPRIO* HTTPRIO=0);' + sLineBreak + sLineBreak;
sTrackerProcPrefix = 'function TrackChange';
sTrackerProcArgs = '(const pName: string; pVal, oVal: variant; _loaded: boolean; nProps: string): string; overload';
sTracker2ProcArgs = '(const pName: string; pVal: TDateTime; oVal: txsdateTime; _loaded:boolean; nProps: string): string; overload;';
sTracker3ProcArgs = '(const pName: string; nProps: string): string; overload;';
sTracker4ProcArgs = '(pVal, oVal: TByteDynArray; const pName: string; _loaded: boolean; nProps: string): string; overload';
sIntfTrackDecl = sTrackerProcPrefix + sTrackerProcArgs+ sLineBreak;
sIntfTrack2Decl = sTrackerProcPrefix + sTracker2ProcArgs+ sLineBreak;
sIntfTrack3Decl = sTrackerProcPrefix + sTracker3ProcArgs+ sLineBreak;
sIntfTrack4Decl = sTrackerProcPrefix + sTracker4ProcArgs+ sLineBreak;
// Then in WSDLPasWriter I added my new constant arrays:
SetterImpl2:array[Boolean] of string = (sRemoteClassSetterImplPas2, sRemoteClassSetterImplPasIdx2);
SetterImpl3:array[Boolean] of string = (sRemoteClassSetterImplPas3, sRemoteClassSetterImplPasIdx3);
SetterImpl4:array[Boolean] of string = (sRemoteClassSetterImplPas4, sRemoteClassSetterImplPasIdx4);
// then modified the setter section in 'WriteComplexTypeClass'
{ Setter }
if UseSetGets or GenSpecifiedSupport(Member) then
begin
if GenSpecifiedSupport(Member) then
begin
WriteFmt(SetterImpl2[HasIndexDecl(Member)],[WSDLType.LangName,
Member.LangName,
Member.DataType.LangName])
end
else
begin
if (ContainsStr(BaseName, 'Dto')) and (not ContainsStr(Member.DataType.LangName, 'XS'))
and (not ContainsStr(Member.DataType.LangName, 'ArrayOf')) then
if (ContainsStr(Member.DataType.LangName, 'TByteDynArray')) then
WriteFmt(SetterImpl4[HasIndexDecl(Member)],[WSDLType.LangName,
Member.LangName,
Member.DataType.LangName])
else
WriteFmt(SetterImpl3[HasIndexDecl(Member)],[WSDLType.LangName,
Member.LangName,
Member.DataType.LangName])
else
WriteFmt(SetterImpl1[HasIndexDecl(Member)],[WSDLType.LangName,
Member.LangName,
Member.DataType.LangName]);
end;
// at WriteInterfaceEnd I added
WriteFmt(sIntfTrackDecl, []);
WriteFmt(sIntfTrack2Decl, []);
WriteFmt(sIntfTrack3Decl, []);
WriteFmt(sIntfTrack4Decl, []);
// at WriteInterfaceBegin I added
WriteLn(sTrackerProc, []);
WriteLn(sTracker2Proc, []);
WriteLn(sTracker3Proc, []);
WriteLn(sTracker4Proc, []);
// finally I changed the wsdlImp dpr and replaced 'AnsiString' (or 'widestring' I can't remember) with 'string'
//在WSDLImpConst中
//我将sRemoteClassDeclPas常量值“private”更改为“protected”
//然后我在Sunitini之后添加了这些
sTrackerDec=sTrackerProcPrefix+sTrackerProcArgs+sLineBreak;
sTrackerProc=sTrackerDec+“开始”+滑动断裂+
'结果:=nProps;'+滑裂+
'如果(_加载)和(椭圆形pVal),则'+sLineBreak+
“开始”+sLineBreak+
'结果:=TrackChange(pName,nProps);'+滑裂+
'结束;'+滑裂+
'结束;'+滑裂;
sTracker2Dec=sTrackerProcPrefix+sTracker2ProcArgs+sLineBreak;
sTracker2Proc=sTracker2Dec+“开始”+滑动断裂+
'结果:=nProps;'+滑裂+
'如果(_加载)和(椭圆日期时间到椭圆日期时间(pVal)),则'+sLineBreak+
“开始”+sLineBreak+
'结果:=TrackChange(pName,nProps);'+滑裂+
'结束;'+滑裂+
'结束;'+滑裂;
sTracker3Dec=sTrackerProcPrefix+sTracker3ProcArgs+sLineBreak;
sTracker3Proc=sTracker3Dec+“开始”+sLineBreak+
'结果:=nProps;'+滑裂+
'如果nProps='',则'+sLineBreak'+
'nProps:=pName'+sLineBreak+
'else'+sLineBreak+
'nProps:=pName+'',+nProps;'+滑裂+
'结果:=nProps;'+滑裂+
'结束;'+滑裂;
sTracker4Dec=sTrackerProcPrefix+sTracker4ProcArgs+sLineBreak;
sTracker4Proc=sTracker4Dec+“开始”+sLineBreak+
'结果:=nProps;'+滑裂+
'如果(_加载)和(椭圆形pVal),则'+sLineBreak+
“开始”+sLineBreak+
'结果:=TrackChange(pName,nProps);'+滑裂+
'结束;'+滑裂+
“结束;”
//添加了我自己的setter:
sremoteclasssetterimplppas='过程%0:s.Set%1:s(常量A%2:s:%2:s);'+滑裂+
“开始”+sLineBreak+
“F%1:s:=A%2:s;”滑裂+
'结束;'+滑裂;
sRemoteClassSetterImplPas2='过程%0:s.Set%1:s(常量A%2:s:%2:s);'+滑裂+
“开始”+sLineBreak+
“F%1:s:=A%2:s;”滑裂+
“F%1:s_指定:=True;”+斯莱内布雷