From 4087fd6888cda337e3a4c3aeb1a7e6972ec7155d Mon Sep 17 00:00:00 2001
From: joost <joost@cnoc.nl>
Date: Sat, 9 Aug 2008 10:37:03 +0000
Subject: [PATCH]  * Implemented TBufDataset.CreateDataset  * TBufDataset can
 now be used as a memory-dataset like TMemDataset

git-svn-id: trunk@11539 -
---
 packages/fcl-db/src/base/bufdataset.pas | 27 +++++++++++++++++++++---
 packages/fcl-db/tests/testdbbasics.pas  | 28 +++++++++++++++++++++++++
 2 files changed, 52 insertions(+), 3 deletions(-)

diff --git a/packages/fcl-db/src/base/bufdataset.pas b/packages/fcl-db/src/base/bufdataset.pas
index 1845eee4ca..f02f1915d3 100644
--- a/packages/fcl-db/src/base/bufdataset.pas
+++ b/packages/fcl-db/src/base/bufdataset.pas
@@ -371,8 +371,8 @@ type
     procedure SetFilterText(const Value: String); override; {virtual;}
     procedure SetFiltered(Value: Boolean); override; {virtual;}
   {abstracts, must be overidden by descendents}
-    function Fetch : boolean; virtual; abstract;
-    function LoadField(FieldDef : TFieldDef;buffer : pointer; out CreateBlob : boolean) : boolean; virtual; abstract;
+    function Fetch : boolean; virtual;
+    function LoadField(FieldDef : TFieldDef;buffer : pointer; out CreateBlob : boolean) : boolean; virtual;
     procedure LoadBlobIntoBuffer(FieldDef: TFieldDef;ABlobBuf: PBufBlobField); virtual; abstract;
 
   public
@@ -394,6 +394,7 @@ type
       const ACaseInsFields: string = ''); virtual;
     procedure SaveToFile(const FileName: string = ''; Format: TDataPacketFormat = dfBinary);
     procedure LoadFromFile(const AFileName: string = '');
+    procedure CreateDataset;
 
     property ChangeCount : Integer read GetChangeCount;
     property MaxIndexesCount : Integer read FMaxIndexesCount write SetMaxIndexesCount;
@@ -752,7 +753,7 @@ end;
 
 Function TBufDataset.GetCanModify: Boolean;
 begin
-  Result:= False;
+  Result:= True;
 end;
 
 function TBufDataset.intAllocRecordBuffer: PChar;
@@ -2323,6 +2324,12 @@ begin
   FileName := StoreFileName;
 end;
 
+procedure TBufDataset.CreateDataset;
+begin
+  CheckInactive;
+  CreateFields;
+end;
+
 procedure TBufDataset.IntLoadFromFile(const FileName: string);
 
   function GetNodeAttribute(const aNode : TDOMNode; AttName : String) : string;
@@ -2458,6 +2465,20 @@ begin
     Refresh;
 end;
 
+function TBufDataset.Fetch: boolean;
+begin
+  // Empty procedure to make it possible to use TBufDataset as a memory dataset
+  Result := False;
+end;
+
+function TBufDataset.LoadField(FieldDef: TFieldDef; buffer: pointer; out
+  CreateBlob: boolean): boolean;
+begin
+  // Empty procedure to make it possible to use TBufDataset as a memory dataset
+  CreateBlob := False;
+  Result := False;
+end;
+
 procedure TBufDataset.ParseFilter(const AFilter: string);
 begin
   // parser created?
diff --git a/packages/fcl-db/tests/testdbbasics.pas b/packages/fcl-db/tests/testdbbasics.pas
index b10b8969e2..e295462616 100644
--- a/packages/fcl-db/tests/testdbbasics.pas
+++ b/packages/fcl-db/tests/testdbbasics.pas
@@ -29,6 +29,7 @@ type
     procedure TearDown; override;
   published
     procedure TestFileNameProperty;
+    procedure TestClientDatasetAsMemDataset;
     procedure TestCancelUpdDelete1;
     procedure TestCancelUpdDelete2;
     procedure TestSafeAsXML;
@@ -534,6 +535,33 @@ begin
   FTestXMLDatasetDefinition(Ds);
 end;
 
+procedure TTestDBBasics.TestClientDatasetAsMemDataset;
+var ds : TBufDataset;
+    i  : integer;
+begin
+  ds := TBufDataset.Create(nil);
+  DS.FieldDefs.Add('ID',ftInteger);
+  DS.FieldDefs.Add('NAME',ftString,50);
+  DS.CreateDataset;
+  DS.Open;
+  for i := 1 to 10 do
+    begin
+    ds.Append;
+    ds.FieldByName('ID').AsInteger := i;
+    ds.FieldByName('NAME').AsString := 'TestName' + inttostr(i);
+    DS.Post;
+    end;
+  ds.first;
+  for i := 1 to 10 do
+    begin
+    AssertEquals(i,ds.fieldbyname('ID').asinteger);
+    AssertEquals('TestName' + inttostr(i),ds.fieldbyname('NAME').AsString);
+    ds.next;
+    end;
+  AssertTrue(ds.EOF);
+  DS.Close;
+end;
+
 procedure TTestDBBasics.TestAppendInsertRecord;
 begin
   with DBConnector.GetNDataset(true,6) do