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ESoft.Launcher.DM.Main.pas
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Unit ESoft.Launcher.DM.Main;
{ ----------------- Single Table Database ------------------ }
{ ---------------------------------------------------------- }
{ Developed by Muhammad Ajmal p }
{ ajumalp@gmail.com }
{ ---------------------------------------------------------- }
Interface
Uses
Vcl.Forms,
System.SysUtils,
System.Classes,
System.Types,
Data.DbxSqlite,
Data.DB,
Vcl.Dialogs,
Data.SqlExpr,
Datasnap.Provider,
Datasnap.DBClient,
Generics.Collections,
Variants,
MidasLib,
Data.FMTBcd;
Const
cDB_FIELD_OID = 'OID';
cDB_FIELD_PARENTID = 'PARENTID';
cDB_FIELD_NAME = 'NAME';
cDB_FIELD_VALUE = 'VALUE';
cDB_FIELD_STATUS = 'STATUS';
Type
TdmMain = Class;
TESTDBChildNodes = Class;
eSTDBItemStatus = (sdsActive, sdsDeleted, sdsInActive);
eSTDBItemState = (sdsBrowse, sdsNew, sdsUpdating);
IESTDBNode = Interface
Function GetOID: Int64;
Function GetParentID: Int64;
Function GetName: String;
Function GetValue: Variant;
Procedure SetValue(Const aValue: Variant);
Function GetStatus: eSTDBItemStatus;
Function GetAsString: String;
Function GetAsInteger: Integer;
Function GetAsBoolean: Boolean;
Function GetChildNode(aNodeName: String): IESTDBNode;
Function GetChildNodeEx(aNodeName: String; aDefaultValue: Variant): IESTDBNode;
Function GetState: eSTDBItemState;
Function GetIsLastChild: Boolean;
Function GetHasChildren: Boolean;
Function IsRootNode: Boolean;
Function HasData: Boolean;
Function MoveToFirstChild: IESTDBNode;
Function FirstChild: IESTDBNode;
Function NextChild: IESTDBNode;
Function ChildExists(Const aNodeName: String): Boolean;
Procedure DeleteChild(Const aNodeName: String);
Procedure Clear;
Procedure Activate;
Procedure Delete(Const aDeleteType: eSTDBItemStatus = sdsDeleted; Const aDeleteFromDB: Boolean = False);
Property OID: Int64 Read GetOID;
Property ParentID: Int64 Read GetParentID;
Property Name: String Read GetName;
Property Status: eSTDBItemStatus Read GetStatus;
Property State: eSTDBItemState Read GetState;
Property IsLastChild: Boolean Read GetIsLastChild;
Property HasChildren: Boolean Read GetHasChildren;
Property ChildNode[aNodeName: String]: IESTDBNode Read GetChildNode; Default;
Property ChildNode[aNodeName: String; aDefaultValue: Variant]: IESTDBNode Read GetChildNodeEx; Default;
Property Value: Variant Read GetValue Write SetValue;
Property AsString: String Read GetAsString;
Property AsInteger: Integer Read GetAsInteger;
Property AsBoolean: Boolean Read GetAsBoolean;
End;
TESTDBChildNodes = Class(TDictionary<String, IESTDBNode>);
TESTDBNode = Class(TInterfacedObject, IESTDBNode)
Strict Private
FChildNodes: TESTDBChildNodes;
FDataset: TClientDataSet;
FIsLoaded: Boolean;
FOID: Int64;
FParentID: Int64;
FName: String;
FValue: Variant;
FStatus: eSTDBItemStatus;
FIsLastChild: Boolean;
FCurrentChildBookmark: TBookmark;
FMoveToFirstChild: Boolean;
FParentNode: IESTDBNode;
Function GetAsString: String;
Function GetAsInteger: Integer;
Function GetAsBoolean: Boolean;
Procedure LoadData;
Procedure ValidateLastChild;
Function GetChildNode(aNodeName: String): IESTDBNode;
Function GetChildNodeEx(aNodeName: String; aDefaultValue: Variant): IESTDBNode;
Function GetIsLastChild: Boolean;
Function GetHasChildren: Boolean;
Function GetState: eSTDBItemState;
Function Locate(Const aKeys: Array Of String; Const aValues: Array Of Variant): Boolean; Overload;
Function Locate: Boolean; Overload;
Procedure Post;
Strict Protected
Function GetOID: Int64; Virtual;
Function GetParentID: Int64; Virtual;
Function GetName: String; Virtual;
Function GetValue: Variant; Virtual;
Procedure SetValue(Const aValue: Variant);
Function GetStatus: eSTDBItemStatus; Virtual;
Public
Constructor Create(Const aDataset: TClientDataSet; aParentID: Int64; aNodeName: String);
Destructor Destroy; Override;
Function IsRootNode: Boolean;
Function HasData: Boolean;
Function MoveToFirstChild: IESTDBNode;
Function FirstChild: IESTDBNode;
Function NextChild: IESTDBNode;
Function ChildExists(Const aNodeName: String): Boolean;
Procedure DeleteChild(Const aNodeName: String);
Procedure Clear;
Procedure Activate;
Procedure Delete(Const aDeleteType: eSTDBItemStatus = sdsDeleted; Const aDeleteFromDB: Boolean = False);
Property OID: Int64 Read GetOID;
Property ParentID: Int64 Read GetParentID;
Property Name: String Read GetName;
Property Value: Variant Read GetValue Write SetValue;
Property Status: eSTDBItemStatus Read GetStatus;
Property State: eSTDBItemState Read GetState;
Property IsLastChild: Boolean Read GetIsLastChild;
Property HasChildren: Boolean Read GetHasChildren;
Property ChildNode[aNodeName: String]: IESTDBNode Read GetChildNode; Default;
Property ChildNode[aNodeName: String; aDefaultValue: Variant]: IESTDBNode Read GetChildNodeEx; Default;
Property AsString: String Read GetAsString;
Property AsInteger: Integer Read GetAsInteger;
Property AsBoolean: Boolean Read GetAsBoolean;
End;
TESTDBRootNode = Class(TESTDBNode)
Strict Protected
Function GetOID: Int64; Override;
Function GetParentID: Int64; Override;
Function GetName: String; Override;
Function GetValue: Variant; Override;
Function GetStatus: eSTDBItemStatus; Override;
Procedure SetValue(Const aValue: Variant);
Public
Constructor Create(Const aDataset: TClientDataSet); Reintroduce;
End;
IESTDatabase = Interface
Function GetRootNode: IESTDBNode;
Function GetChildNode(aNodeName: String): IESTDBNode;
Function GetChildNodeEx(aNodeName: String; aDefaultValue: Variant): IESTDBNode;
Function GetConnection: TSQLConnection;
Function SaveToDB: Integer;
Function NextOID: Int64;
Function FetchQuery(Const aQuery: String): Variant;
Function ExecuteQuery(Const aQuery: String): Integer;
Function NodeExists(Const aParentID: Int64; Const aNodeName: String): Boolean;
Procedure PurgeDatabase;
Property Connection: TSQLConnection Read GetConnection;
Property RootNode: IESTDBNode Read GetRootNode;
Property ChildNode[aNodeName: String]: IESTDBNode Read GetChildNode; Default;
Property ChildNode[aNodeName: String; aDefaultValue: Variant]: IESTDBNode Read GetChildNodeEx; Default;
End;
TESTDatabase = Class(TInterfacedObject, IESTDatabase)
Strict Private
FDataModule: TdmMain;
FRootNode: IESTDBNode;
FNextOID: Int64;
Function GetDataModule: TdmMain;
Function GetRootNode: IESTDBNode;
Function GetGeneralDSet: TClientDataSet;
Function GetChildNode(aNodeName: String): IESTDBNode;
Function GetChildNodeEx(aNodeName: String; aDefaultValue: Variant): IESTDBNode;
Procedure ExtractDatabaseFile(Const aResName, aFileName: String);
Function GetConnection: TSQLConnection;
Procedure ReloadData;
Procedure ResetObjectIDPK;
Function NextOID: Int64;
Property DataModule: TdmMain Read GetDataModule;
Property GeneralDSet: TClientDataSet Read GetGeneralDSet;
Public
Constructor Create;
Destructor Destroy; Override;
Function SaveToDB: Integer;
Function FetchQuery(Const aQuery: String): Variant;
Function ExecuteQuery(Const aQuery: String): Integer;
Function NodeExists(Const aParentID: Int64; Const aNodeName: String): Boolean;
Procedure PurgeDatabase;
Property Connection: TSQLConnection Read GetConnection;
Property RootNode: IESTDBNode Read GetRootNode;
Property ChildNode[aNodeName: String]: IESTDBNode Read GetChildNode; Default;
Property ChildNode[aNodeName: String; aDefaultValue: Variant]: IESTDBNode Read GetChildNodeEx; Default;
End;
TdmMain = Class(TDataModule)
clntDSetSTDBMain: TClientDataSet;
dsProSTDBMain: TDataSetProvider;
SQLCnnMain: TSQLConnection;
qrySTDBMain: TSQLQuery;
Procedure DataModuleCreate(Sender: TObject);
Procedure clntDSetSTDBMainReconcileError(DataSet: TCustomClientDataSet; E: EReconcileError; UpdateKind: TUpdateKind; Var Action: TReconcileAction);
Public
Function BuildConnectionString(Const aDatabase: String): String;
Property GeneralDSet: TClientDataSet Read clntDSetSTDBMain;
End;
Function STDatabase: IESTDatabase;
Implementation
{%CLASSGROUP 'Vcl.Controls.TControl'}
{$R *.dfm}
Var
_STDatabase: IESTDatabase = Nil;
Function STDatabase: IESTDatabase;
Begin
If Not Assigned(_STDatabase) Then
_STDatabase := TESTDatabase.Create;
Result := _STDatabase;
End;
Function TdmMain.BuildConnectionString(Const aDatabase: String): String;
Var
sDatabase: String;
Begin
If Not FileExists(aDatabase) Then
Begin
sDatabase := ExtractFilePath(ParamStr(0)) + aDatabase;
If Not FileExists(sDatabase) Then
Raise Exception.Create(Format('Invalid database [%s]', [aDatabase]));
End;
Result := 'DRIVER=SQLite3 ODBC Driver;Database=' + aDatabase + ';LongNames=0;Timeout=1000;NoTXN=0;SyncPragma=NORMAL;StepAPI=0;';
End;
Procedure TdmMain.clntDSetSTDBMainReconcileError(DataSet: TCustomClientDataSet; E: EReconcileError; UpdateKind: TUpdateKind; Var Action: TReconcileAction);
Begin
MessageDlg(E.Message, mtError, [mbOK], 0);
End;
Procedure TdmMain.DataModuleCreate(Sender: TObject);
Begin
SQLCnnMain.Params.Values['Database'] := ExtractFilePath(ParamStr(0)) + 'launcher.db3';
Try
SQLCnnMain.LoginPrompt := False;
SQLCnnMain.Connected := True;
SQLCnnMain.Connected := False;
Except
On Ex: Exception Do
MessageDlg(Ex.Message, mtError, [mbOK], 0);
End;
End;
{ TESTDatabase }
Function TESTDatabase.SaveToDB: Integer;
Begin
Result := GeneralDSet.ApplyUpdates(0);
ResetObjectIDPK;
ReloadData;
End;
Function TESTDatabase.GetConnection: TSQLConnection;
Begin
Result := DataModule.SQLCnnMain;
End;
Procedure TESTDatabase.PurgeDatabase;
Begin
ExecuteQuery('DELETE FROM STDBMAIN WHERE STATUS = "D"');
End;
Constructor TESTDatabase.Create;
Begin
FNextOID := -1;
FDataModule := Nil;
FRootNode := Nil;
End;
Destructor TESTDatabase.Destroy;
Begin
If Assigned(FDataModule) Then
FreeAndNil(FDataModule);
Inherited;
End;
Function TESTDatabase.FetchQuery(Const aQuery: String): Variant;
Var
varSQLQuery: TSQLQuery;
Begin
Result := Null;
varSQLQuery := TSQLQuery.Create(Nil);
Try
varSQLQuery.SQLConnection := DataModule.SQLCnnMain;
varSQLQuery.SQL.Text := aQuery;
varSQLQuery.Open;
If Not varSQLQuery.IsEmpty Then
Result := varSQLQuery.Fields[0].AsVariant;
Finally
varSQLQuery.Free;
End;
End;
Function TESTDatabase.ExecuteQuery(Const aQuery: String): Integer;
Var
varSQLQuery: TSQLQuery;
Begin
varSQLQuery := TSQLQuery.Create(Nil);
Try
varSQLQuery.SQLConnection := DataModule.SQLCnnMain;
varSQLQuery.SQL.Text := aQuery;
Result := varSQLQuery.ExecSQL;
Finally
varSQLQuery.Free;
End;
End;
Procedure TESTDatabase.ExtractDatabaseFile(Const aResName, aFileName: String);
Var
varResStream: TResourceStream;
Begin
If FileExists(ExtractFilePath(ParamStr(0)) + aFileName) Then
Exit;
varResStream := TResourceStream.Create(HInstance, aResName, RT_RCDATA);
Try
varResStream.Position := 0;
varResStream.SaveToFile(ExtractFilePath(ParamStr(0)) + aFileName);
Finally
varResStream.Free;
End;
End;
Function TESTDatabase.GetChildNode(aNodeName: String): IESTDBNode;
Begin
Result := RootNode[aNodeName];
End;
Function TESTDatabase.GetChildNodeEx(aNodeName: String; aDefaultValue: Variant): IESTDBNode;
Begin
Result := RootNode[aNodeName, aDefaultValue];
End;
Function TESTDatabase.GetDataModule: TdmMain;
Begin
If Not Assigned(FDataModule) Then
Begin
ExtractDatabaseFile('sqlite_db', 'launcher.db3');
{$IFDEF WIN64}
ExtractDatabaseFile('sqlite_dll_x64', 'sqlite3.dll');
{$ELSE}
ExtractDatabaseFile('sqlite_dll', 'sqlite3.dll');
{$ENDIF}
FDataModule := TdmMain.Create(Nil);
ReloadData;
End;
Result := FDataModule;
End;
Function TESTDatabase.GetRootNode: IESTDBNode;
Begin
If Not Assigned(FRootNode) Then
FRootNode := TESTDBRootNode.Create(GeneralDSet);
Result := FRootNode;
End;
Function TESTDatabase.NextOID: Int64;
Begin
If FNextOID = -1 Then
Begin
FNextOID := FetchQuery('SELECT MAX(OID) + 1 AS NEXTOID FROM STDBMAIN');
Exit(FNextOID);
End;
Inc(FNextOID);
Result := FNextOID;
End;
Function TESTDatabase.NodeExists(Const aParentID: Int64; Const aNodeName: String): Boolean;
Var
sKeys: String;
Begin
sKeys := Format('%s;%s', [cDB_FIELD_PARENTID, cDB_FIELD_NAME]);
Result := GeneralDSet.Locate(sKeys, VarArrayOf([aParentID, aNodeName]), [loCaseInsensitive]);
End;
Function TESTDatabase.GetGeneralDSet: TClientDataSet;
Begin
Result := DataModule.GeneralDSet;
End;
Procedure TESTDatabase.ReloadData;
Begin
Assert((FNextOID = -1) And (Not GeneralDSet.UpdatesPending), 'Should not reload dataset when updates pending');
If GeneralDSet.Active Then
GeneralDSet.Close;
GeneralDSet.Open;
// Set nill to free and existing objects { Ajmal }
FRootNode := Nil;
End;
Procedure TESTDatabase.ResetObjectIDPK;
Const
cSQL_RESET_OID = 'UPDATE sqlite_sequence SET SEQ = (SELECT MAX(OID) FROM STDBMAIN) WHERE NAME = "STDBMAIN"';
Begin
If FNextOID = -1 Then
Exit;
DataModule.SQLCnnMain.ExecuteDirect(cSQL_RESET_OID);
FNextOID := -1;
End;
{ TESTDBNode }
Procedure TESTDBNode.Activate;
Begin
LoadData;
FStatus := sdsActive;
Post;
End;
Function TESTDBNode.ChildExists(Const aNodeName: String): Boolean;
Begin
Result := Locate([cDB_FIELD_PARENTID, cDB_FIELD_NAME], [OID, aNodeName]);
End;
Procedure TESTDBNode.Clear;
Begin
Value := Null;
End;
Constructor TESTDBNode.Create(Const aDataset: TClientDataSet; aParentID: Int64; aNodeName: String);
Begin
FOID := 0;
FValue := Null;
FIsLoaded := False;
FParentID := aParentID;
FName := aNodeName;
FDataset := aDataset;
FIsLastChild := False;
FMoveToFirstChild := False;
FChildNodes := TESTDBChildNodes.Create;
End;
Procedure TESTDBNode.Delete(Const aDeleteType: eSTDBItemStatus = sdsDeleted; Const aDeleteFromDB: Boolean = False);
Function _DeleteQuery(Const aDeleteFrom: String = 'PARENTID'): String;
Begin
If aDeleteFromDB Then
Exit('DELETE FROM STDBMAIN WHERE ' + aDeleteFrom + ' = ');
Case aDeleteType Of
sdsDeleted:
Result := 'UPDATE STDBMAIN SET STATUS = "D" WHERE ' + aDeleteFrom + ' = ';
sdsInActive:
Result := 'UPDATE STDBMAIN SET STATUS = "I" WHERE ' + aDeleteFrom + ' = ';
End;
End;
Procedure _DeleteChildNodes(Const aOID: Int64);
Var
lOID: Int64;
varOIDList: TList<Int64>;
varSQLQuery: TSQLQuery;
Begin
varOIDList := TList<Int64>.Create;
varSQLQuery := TSQLQuery.Create(Nil);
Try
With varSQLQuery Do
Begin
varSQLQuery.SQLConnection := STDatabase.Connection;
SQL.Text := 'SELECT OID FROM STDBMAIN WHERE PARENTID = ' + aOID.ToString;
Open;
While Not Eof Do
Begin
varOIDList.Add(FieldByName('OID').AsInteger);
Next;
End;
Close;
End;
For lOID In varOIDList Do
_DeleteChildNodes(lOID);
Finally
varSQLQuery.Free;
varOIDList.Free;
End;
STDatabase.ExecuteQuery(_DeleteQuery + aOID.ToString);
End;
Begin
Assert(Not FDataset.UpdatesPending, 'Should not delete when updates are pending');
_DeleteChildNodes(OID);
STDatabase.ExecuteQuery(_DeleteQuery('OID') + OID.ToString);
End;
Procedure TESTDBNode.DeleteChild(Const aNodeName: String);
Begin
If ChildExists(aNodeName) Then
ChildNode[aNodeName].Delete;
End;
Destructor TESTDBNode.Destroy;
Begin
FreeAndNil(FChildNodes);
Inherited;
End;
Function TESTDBNode.FirstChild: IESTDBNode;
Var
sChildNodeName: String;
Begin
Result := Nil;
LoadData;
If Locate([cDB_FIELD_PARENTID], [FOID]) Then
Begin
FCurrentChildBookmark := FDataset.Bookmark;
ValidateLastChild;
sChildNodeName := FDataset.FieldByName(cDB_FIELD_NAME).AsString;
Result := ChildNode[sChildNodeName];
FMoveToFirstChild := False;
End;
End;
Function TESTDBNode.GetAsBoolean: Boolean;
Begin
Result := AsString.ToBoolean;
End;
Function TESTDBNode.GetAsInteger: Integer;
Begin
Result := AsString.ToInteger;
End;
Function TESTDBNode.GetAsString: String;
Begin
Result := VarToStr(Value);
End;
Function TESTDBNode.GetChildNode(aNodeName: String): IESTDBNode;
Begin
Result := GetChildNodeEx(aNodeName, Null);
End;
Function TESTDBNode.GetChildNodeEx(aNodeName: String; aDefaultValue: Variant): IESTDBNode;
Begin
If Not FChildNodes.ContainsKey(aNodeName) Then
FChildNodes.Add(aNodeName, TESTDBNode.Create(FDataset, OID, aNodeName));
Result := FChildNodes.Items[aNodeName];
If Not Locate([cDB_FIELD_PARENTID, cDB_FIELD_NAME], [OID, aNodeName]) Then
Begin
FDataset.Append;
FDataset.FieldByName(cDB_FIELD_OID).ReadOnly := False;
FDataset.FieldByName(cDB_FIELD_OID).Value := STDatabase.NextOID;
FDataset.FieldByName(cDB_FIELD_PARENTID).AsInteger := OID;
FDataset.FieldByName(cDB_FIELD_NAME).AsString := aNodeName;
FDataset.FieldByName(cDB_FIELD_VALUE).Value := aDefaultValue;
FDataset.FieldByName(cDB_FIELD_STATUS).AsString := 'A';
FDataset.Post;
Result.Value := aDefaultValue;
End;
End;
Function TESTDBNode.GetHasChildren: Boolean;
Begin
Result := Locate([cDB_FIELD_PARENTID], [OID]);
End;
Function TESTDBNode.GetIsLastChild: Boolean;
Begin
Result := FIsLastChild Or Not HasChildren;
End;
Function TESTDBNode.GetName: String;
Begin
LoadData;
Result := FName
End;
Function TESTDBNode.GetOID: Int64;
Begin
LoadData;
Result := FOID;
End;
Function TESTDBNode.GetParentID: Int64;
Begin
LoadData;
Result := FParentID;
End;
Function TESTDBNode.GetState: eSTDBItemState;
Begin
Result := sdsNew;
If Locate([cDB_FIELD_PARENTID, cDB_FIELD_NAME], [ParentID, Name]) Then
Begin
Case FDataset.UpdateStatus Of
usInserted:
Result := sdsNew;
usModified:
Result := sdsUpdating;
usUnmodified:
Result := sdsBrowse;
End;
End;
End;
Function TESTDBNode.GetStatus: eSTDBItemStatus;
Begin
LoadData;
Result := FStatus;
End;
Function TESTDBNode.GetValue: Variant;
Begin
LoadData;
Result := FValue;
End;
Function TESTDBNode.HasData: Boolean;
Begin
Result := Not VarIsNull(Value);
End;
Procedure TESTDBNode.ValidateLastChild;
Begin
FIsLastChild := FDataset.Eof;
If Not FIsLastChild Then
Begin
FDataset.Next;
Try
FIsLastChild := FDataset.FieldByName(cDB_FIELD_PARENTID).AsInteger <> OID;
Finally
FDataset.Prior;
End;
End;
End;
Function TESTDBNode.IsRootNode: Boolean;
Begin
Result := ParentID = 0;
End;
Procedure TESTDBNode.LoadData;
Var
sStatus: String;
Begin
If FIsLoaded Then
Exit;
If Not Locate Then
Raise Exception.Create('Invalid Node Access');
FOID := FDataset.FieldByName(cDB_FIELD_OID).AsInteger;
FValue := FDataset.FieldByName(cDB_FIELD_VALUE).AsVariant;
sStatus := FDataset.FieldByName(cDB_FIELD_STATUS).AsString.Trim;
If sStatus.Equals('A') Then
FStatus := sdsActive
Else If sStatus.Equals('D') Then
FStatus := sdsDeleted
Else If sStatus.Equals('I') Then
FStatus := sdsInActive;
FIsLoaded := True;
End;
Function TESTDBNode.Locate: Boolean;
Var
vParentID: Variant;
Begin
vParentID := FParentID;
If FParentID = 0 Then
vParentID := Null;
Result := Locate([cDB_FIELD_PARENTID, cDB_FIELD_NAME], [vParentID, FName]);
End;
Function TESTDBNode.MoveToFirstChild: IESTDBNode;
Begin
// We should call FirstChild to validate IsLastChild
Result := FirstChild;
// Set FMoveToFirstChild after calling FirstChild
// Because FirstChild will reset FMoveToFirstChild
FMoveToFirstChild := True;
End;
Function TESTDBNode.Locate(Const aKeys: Array Of String; Const aValues: Array Of Variant): Boolean;
Var
iCntr: Integer;
sKeys: String;
Begin
sKeys := EmptyStr;
For iCntr := Low(aKeys) To High(aKeys) Do
Begin
If Not sKeys.IsEmpty Then
sKeys := sKeys + ';';
sKeys := sKeys + aKeys[iCntr];
End;
Result := FDataset.Locate(sKeys, VarArrayOf(aValues), [loCaseInsensitive]);
End;
Function TESTDBNode.NextChild: IESTDBNode;
Var
sChildNodeName: String;
Begin
If FMoveToFirstChild Then
Exit(FirstChild);
If IsLastChild Then
Exit(Nil);
Assert(FDataset.BookmarkValid(FCurrentChildBookmark), 'Invalid bookmark');
FDataset.Bookmark := FCurrentChildBookmark;
FDataset.Next;
FCurrentChildBookmark := FDataset.GetBookmark;
ValidateLastChild;
sChildNodeName := FDataset.FieldByName(cDB_FIELD_NAME).AsString;
Result := ChildNode[sChildNodeName];
End;
Procedure TESTDBNode.Post;
Begin
If Locate Then
FDataset.Edit
Else
FDataset.Append;
FDataset.FieldByName(cDB_FIELD_VALUE).Value := FValue;
// When a value is set, the re activate the node { Ajmal }
FDataset.FieldByName(cDB_FIELD_STATUS).Value := 'A';
FDataset.Post;
End;
Procedure TESTDBNode.SetValue(Const aValue: Variant);
Begin
LoadData;
FValue := aValue;
Post;
End;
{ TESTDBRootNode }
Constructor TESTDBRootNode.Create(Const aDataset: TClientDataSet);
Begin
Inherited Create(aDataset, 0, 'root');
End;
Function TESTDBRootNode.GetName: String;
Begin
Result := 'root';
End;
Function TESTDBRootNode.GetOID: Int64;
Begin
Result := 1;
End;
Function TESTDBRootNode.GetParentID: Int64;
Begin
Result := 0;
End;
Function TESTDBRootNode.GetStatus: eSTDBItemStatus;
Begin
Result := sdsActive;
End;
Function TESTDBRootNode.GetValue: Variant;
Begin
Result := Null;
End;
Procedure TESTDBRootNode.SetValue(Const aValue: Variant);
Begin
// We should not change the value of root node { Ajmal }
End;
End.