mORMot Open Source

-Pol_S-

Member

Registered: 2019-07-24

Posts: 6

AccessViolation in IsObjectDefaultOrVoid

Hi!
I plan to update my project from M1 to M2. I try to start with a small test. But something went wrong. The code is not complex, but it does not work.

Declaration from unit DBInfo_Unit.pas:

  ...........  
  TDBInfo = class(TSynAutoCreateFields)
  private
    fDBID      : TDBID;
    fDBName    : TDBName;
    fDBFile    : TDBFile;
    fCreateDate: TTimeLog;
    fLastOpen  : TTimeLog;
    fData      : string;
    fArr       : TDocArray;
    fColl      : TCollTests;
  public
    function Documents: TDynArray;
    procedure FromORM(ormDBInfo: TOrmDBInfo);
  published
    property DBID      : TDBID read fDBID write fDBID;
    property DBName    : TDBName read fDBName write fDBName;
    property DBFile    : TDBFile read fDBFile write fDBFile;
    property CreateDate: TTimeLog read fCreateDate write fCreateDate;
    property LastOpen  : TTimeLog read fLastOpen write fLastOpen;
    property data      : string read fData write fData;
    property DocArray  : TDocArray read fArr write fArr;
    property Coll      : TCollTests read fColl;
  end;

  TDBInfoArray = array of TDBInfo;

  IDBInfoService = interface(IInvokable)
    ['{495A2BC3-E1EB-45BD-9ABB-B1F6B1395E74}']
    function Add(var aDBInfo: TDBInfo): TServiceResult;
    function GetOne(var aDBInfo: TDBInfo; FindBy: TFindBy): TServiceResult;
    function GetWhere(const aWhere: string; const BoundsWhere: array of const; var aDBInfoArr: TDBInfoArray; var Count: Integer): TServiceResult;
    function Update(const aDBInfo: TDBInfo): TServiceResult;
    function Delete(const aID: TID): TServiceResult;
    function TotalCount: Integer;
  end;

  /// ORM class corresponding to TDBInfo
  TOrmDBInfo = class(TOrm)
  protected
    fDBName    : string;
    fDBFile    : string; 
    fCreateDate: TTimeLog;
    fLastOpen  : TTimeLog;
    fData      : string; 
    fCollVar   : string;
    fDocArray  : string;
  public
    procedure FromObject(aDBInfo: TDBInfo; IncludeId: Boolean = True);
  published
    property DBName    : string read fDBName write fDBName { stored AS_UNIQUE };
    property DBFile    : string read fDBFile write fDBFile { stored AS_UNIQUE };
    property CreateDate: TTimeLog read fCreateDate write fCreateDate;
    property LastOpen  : TTimeLog read fLastOpen write fLastOpen;
    property data      : string read fData write fData;
    property DocArray  : string  read fDocArray write fDocArray;
    property Coll      : string read fCollVar write fCollVar;
  end;

  TOrmDBInfoArray = array of TOrmDBInfo;

  TDBInfoService = class(TInjectableObjectRest, IDBInfoService)
  public
    function Add(var aDBInfo: TDBInfo): TServiceResult;
    function GetOne(var aDBInfo: TDBInfo; FindBy: TFindBy): TServiceResult;
    function GetWhere(const aWhere: string; const BoundsWhere: array of const; var aDBInfoArr: TDBInfoArray;
      var Count: Integer): TServiceResult;
    function Update(const aDBInfo: TDBInfo): TServiceResult;
    function Delete(const aID: TID): TServiceResult;
    function TotalCount: Integer;
  end;

....................

function TDBInfoService.GetOne(var aDBInfo: TDBInfo; FindBy: TFindBy): TServiceResult;
var
  ormDBInfo: TOrmDBInfo;
begin
  case FindBy of
    fbID: ormDBInfo := TOrmDBInfo.Create(server.orm, 'ID=?', [aDBInfo.DBID]);
    fbName: ormDBInfo := TOrmDBInfo.Create(server.orm, 'DBName=?', [aDBInfo.DBName]);
    fbFile: ormDBInfo := TOrmDBInfo.Create(server.orm, 'DBFile=?', [aDBInfo.DBFile]);
    fbDateCreate: ormDBInfo := TOrmDBInfo.Create(server.orm, 'CreateDate=?', [aDBInfo.CreateDate]);
    fbDateLastOpen: ormDBInfo := TOrmDBInfo.Create(server.orm, 'LastOpen=?', [aDBInfo.LastOpen]);
    fbDataInfo: ormDBInfo := TOrmDBInfo.Create(server.orm, 'CreateDate=?', [aDBInfo.CreateDate]);
  else Exit(srBadRequest);
  end;

  try
    if ormDBInfo.ID = 0 then begin
      result := srNotFound;
    end else begin
      aDBInfo.FromORM(ormDBInfo);
      result := srSuccess;
    end;
  finally
    ormDBInfo.Free;
  end;
end;

function TDBInfoService.GetWhere(const aWhere: string; const BoundsWhere: array of const; var aDBInfoArr: TDBInfoArray;
  var Count: Integer): TServiceResult;
var
  Results  : TOrmDBInfoArray;
  ormDBInfo: TOrmDBInfo;
  aList    : IList<TOrmDBInfo>;
  DA       : TDynArray;
  Idx      : Integer;
begin

  //  ormDBInfo := TOrmDBInfo.CreateAndFillPrepare(server.orm, ToUTF8(aWhere), BoundsWhere);
  //  try
  //    DA := DynArray(TypeInfo(TDocArray), aDBInfoArr);
  //    while ormDBInfo.FillOne do begin
  //      Idx := DA.Add(TDBInfo.Create);
  //      aDBInfoArr[Idx].FromORM(ormDBInfo);
  //    end;
  //    Count := DA.Count;
  //    result := srSuccess;
  //  finally
  //    ormDBInfo.Free;
  //  end;

  //  if server.orm.RetrieveIList(TOrmDBInfo, aList, ToUTF8(aWhere), BoundsWhere) then begin
  //    Count := aList.Count;
  //    SetLength(aDBInfoArr, Count);
  //    for var I := 0 to Count - 1 do begin
  //      aDBInfoArr[I] := TDBInfo.Create;
  //      aDBInfoArr[I].FromORM(aList[I]);
  //    end;
  //    result := srSuccess;
  //  end else result := srBadRequest;

  if server.orm.RetrieveListObjArray(Results, TOrmDBInfo, ToUTF8(aWhere), BoundsWhere) then begin
    try
      Count := Length(Results);
      SetLength(aDBInfoArr, Count);
      for var I := 0 to Count - 1 do begin
        aDBInfoArr[I] := TDBInfo.Create;
        aDBInfoArr[I].FromORM(Results[I]);
      end;
      result := srSuccess;
    finally
      ObjArrayClear(Results);
    end;
  end
  else result := srBadRequest;
end;

Using In main unit:

    CoreModel := TOrmModel.Create([TOrmDBInfo, TAuthUser, TAuthGroup]);
    CoreDBClient := TRestClientDB.Create(CoreModel, nil,  '_TestDBInfo_M2.db3',  TSQLRestServerDB,  True,   ''  );

    // Server
    with CoreDBClient.server do begin
      db.Synchronous := smOff;
      db.LockingMode := lmExclusive;
      CreateMissingTables;
      AuthenticationRegister(TRestServerAuthenticationDefault);
      ServiceDefine(TDBInfoService, [IDBInfoService], sicShared  );
    end;

    // Client
    Check('CoreDBClient.SetUser', CoreDBClient.SetUser('Admin'  , 'synopse'));
    Check('CoreDBClient.ServiceDefine', CoreDBClient.ServiceDefine([IDBInfoService], sicShared ));

............

    Bool := aRest.Services.Resolve(IDBInfoService, cmd);
    if Bool then begin
       for i := 1 to MAX do begin
           DBInfo.DBName := 'Template' + I.Tostring;
           Check('GetOne DBName="' + DBInfo.DBName + '"', cmd.GetOne(DBInfo, fbName) = srSuccess);
       end;

       Check('GetWhere Name = Template_1*', cmd.GetWhere('DBName LIKE ?', ['Template_1%'], DBInfoArr, Count) = srSuccess);
    end;

GetOne work fine. GetWhere's use gives an error  even before entering the implementation. In Log:

20240614 15454602 EXCOS EAccessViolation (c0000005) [Main] at f19c4d mormot.core.rtti.pas IsObjectDefaultOrVoid (9423)  mormot.core.rtti.pas TRttiCustom.ValueIsVoid (8078) mormot.core.json.pas _JS_RttiCustom (5781) mormot.core.interfaces.pas TInterfaceMethodArgument.AddJson (2719) mormot.core.interfaces.pas TInterfacedObjectFake.FakeCallGetJsonFromStack (3442) mormot.soa.client.pas TInterfacedObjectFakeClient.FakeCallGetJsonFromStack (502) mormot.core.interfaces.pas TInterfacedObjectFake.FakeCallInternalProcess (3544) mormot.core.interfaces.pas TInterfacedObjectFakeRaw.FakeCall (3307) 

Am I doing something wrong or missing something?

ab

Administrator

From: France

Registered: 2010-06-21

Posts: 14,660

Website

Re: AccessViolation in IsObjectDefaultOrVoid

Please follow the forum rules and don't post such big amount of code in the forum post itself.

IMHO there is not enough information to find out what is wrong in your code.
Some types are not defined.

-Pol_S-

Member

Registered: 2019-07-24

Posts: 6

Re: AccessViolation in IsObjectDefaultOrVoid

I'm sorry. I didn't think the code in the post belonged to the HUGE category.

I prepared a project that I used to test/study mORMot2 where the named error is reproduced.  I will be grateful if someone has the time and desire to check the code of the program and help me with the cause of the error.

https://drive.google.com/file/d/1-HJb4U … sp=sharing

-Pol_S-

Member

Registered: 2019-07-24

Posts: 6

Re: AccessViolation in IsObjectDefaultOrVoid

Didn't specify... I'm using Delphi 12.1

-Pol_S-

Member

Registered: 2019-07-24

Posts: 6

Re: AccessViolation in IsObjectDefaultOrVoid

Found the cause of the errors. mORMot does not know how to work with parameters in the methods of services of the "array of const" type.

Thank you all.

ab

Administrator

From: France

Registered: 2010-06-21

Posts: 14,660

Website

Re: AccessViolation in IsObjectDefaultOrVoid

You can use a variant kind parameter, then fill it with a TDocVariant.

-Pol_S-

Member

Registered: 2019-07-24

Posts: 6

Re: AccessViolation in IsObjectDefaultOrVoid

Yes of course. I have a Data field in my working project. Its structure depends on the context of the object. I use TDocVariant with it.

The my error in the test project rather refers to the categorys of copy/past and misty eyes.