just a first experimental version

git-svn-id: svn://svn.code.sf.net/p/ultrastardx/svn/branches/experimental@2011 b956fd51-792f-4845-bead-9b4dfca2ff2c

1 files changed, 233 insertions, 0 deletions

diff --git a/Medley/src/lib/SQLite/example/uTestSqlite.pas b/Medley/src/lib/SQLite/example/uTestSqlite.pas
new file mode 100644
index 00000000..484be71c
--- /dev/null
+++ b/Medley/src/lib/SQLite/example/uTestSqlite.pas
@@ -0,0 +1,233 @@
+unit uTestSqlite;
+
+interface
+
+uses
+  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
+  Dialogs, StdCtrls,SQLiteTable3, ExtCtrls, jpeg;
+
+type
+  TForm1 = class(TForm)
+    btnTest: TButton;
+    memNotes: TMemo;
+    Label1: TLabel;
+    Label2: TLabel;
+    ebName: TEdit;
+    Label3: TLabel;
+    ebNumber: TEdit;
+    Label4: TLabel;
+    ebID: TEdit;
+    Image1: TImage;
+    btnLoadImage: TButton;
+    btnDisplayImage: TButton;
+    procedure btnTestClick(Sender: TObject);
+    procedure btnLoadImageClick(Sender: TObject);
+    procedure btnDisplayImageClick(Sender: TObject);
+  private
+    { Private declarations }
+  public
+    { Public declarations }
+  end;
+
+var
+  Form1: TForm1;
+
+implementation
+
+{$R *.dfm}
+
+procedure TForm1.btnTestClick(Sender: TObject);
+var
+slDBpath: string;
+sldb: TSQLiteDatabase;
+sltb: TSQLIteTable;
+sSQL: String;
+Notes: String;
+
+begin
+
+slDBPath := ExtractFilepath(application.exename)
++ 'test.db';
+
+sldb := TSQLiteDatabase.Create(slDBPath);
+try
+
+if sldb.TableExists('testTable') then begin
+sSQL := 'DROP TABLE testtable';
+sldb.execsql(sSQL);
+end;
+
+sSQL := 'CREATE TABLE testtable ([ID] INTEGER PRIMARY KEY,[OtherID] INTEGER NULL,';
+sSQL := sSQL + '[Name] VARCHAR (255),[Number] FLOAT, [notes] BLOB, [picture] BLOB COLLATE NOCASE);';
+
+sldb.execsql(sSQL);
+
+sldb.execsql('CREATE INDEX TestTableName ON [testtable]([Name]);');
+
+//begin a transaction
+sldb.BeginTransaction;
+
+sSQL := 'INSERT INTO testtable(Name,OtherID,Number,Notes) VALUES ("Some Name",4,587.6594,"Here are some notes");';
+//do the insert
+sldb.ExecSQL(sSQL);
+
+sSQL := 'INSERT INTO testtable(Name,OtherID,Number,Notes) VALUES ("Another Name",12,4758.3265,"More notes");';
+//do the insert
+sldb.ExecSQL(sSQL);
+
+//end the transaction
+sldb.Commit;
+
+//query the data
+sltb := slDb.GetTable('SELECT * FROM testtable');
+try
+
+if sltb.Count > 0 then
+begin
+//display first row
+
+ebName.Text := sltb.FieldAsString(sltb.FieldIndex['Name']);
+ebID.Text := inttostr(sltb.FieldAsInteger(sltb.FieldIndex['ID']));
+ebNumber.Text := floattostr( sltb.FieldAsDouble(sltb.FieldIndex['Number']));
+Notes :=  sltb.FieldAsBlobText(sltb.FieldIndex['Notes']);
+memNotes.Text := notes;
+
+end;
+
+finally
+sltb.Free;
+end;
+
+finally
+sldb.Free;
+
+end;
+
+end;
+
+procedure TForm1.btnLoadImageClick(Sender: TObject);
+var
+slDBpath: string;
+sldb: TSQLiteDatabase;
+sltb: TSQLIteTable;
+iID: integer;
+fs: TFileStream;
+
+begin
+
+slDBPath := ExtractFilepath(application.exename)
++ 'test.db';
+
+if not FileExists(slDBPath) then begin
+MessageDLg('Test.db does not exist. Click Test Sqlite 3 to create it.',mtInformation,[mbOK],0);
+exit;
+end;
+
+sldb := TSQLiteDatabase.Create(slDBPath);
+try
+
+//get an ID
+//query the data
+sltb := slDb.GetTable('SELECT ID FROM testtable');
+try
+
+if sltb.Count = 0 then begin
+MessageDLg('There are no rows in the database. Click Test Sqlite 3 to insert a row.',mtInformation,[mbOK],0);
+exit;
+end;
+
+iID := sltb.FieldAsInteger(sltb.FieldIndex['ID']);
+
+finally
+sltb.Free;
+end;
+
+//load an image
+fs := TFileStream.Create(ExtractFileDir(application.ExeName) + '\sunset.jpg',fmOpenRead);
+try
+
+//insert the image into the db
+sldb.UpdateBlob('UPDATE testtable set picture = ? WHERE ID = ' + inttostr(iID),fs);
+
+finally
+fs.Free;
+end;
+
+finally
+sldb.Free;
+
+end;
+
+end;
+
+procedure TForm1.btnDisplayImageClick(Sender: TObject);
+var
+slDBpath: string;
+sldb: TSQLiteDatabase;
+sltb: TSQLIteTable;
+iID: integer;
+ms: TMemoryStream;
+pic: TJPegImage;
+
+begin
+
+slDBPath := ExtractFilepath(application.exename)
++ 'test.db';
+
+if not FileExists(slDBPath) then begin
+MessageDLg('Test.db does not exist. Click Test Sqlite 3 to create it, then Load image to load an image.',mtInformation,[mbOK],0);
+exit;
+end;
+
+sldb := TSQLiteDatabase.Create(slDBPath);
+try
+
+//get an ID
+//query the data
+sltb := slDb.GetTable('SELECT ID FROM testtable');
+try
+
+if not sltb.Count = 0 then begin
+MessageDLg('No rows in the test database. Click Test Sqlite 3 to insert a row, then Load image to load an image.',mtInformation,[mbOK],0);
+exit;
+end;
+
+iID := sltb.FieldAsInteger(sltb.FieldIndex['ID']);
+
+finally
+sltb.Free;
+end;
+
+sltb := sldb.GetTable('SELECT picture FROM testtable where ID = ' + inttostr(iID));
+try
+
+ms := sltb.FieldAsBlob(sltb.FieldIndex['picture']);
+//note that the memory stream is freed when the TSqliteTable is destroyed.
+
+if (ms = nil) then begin
+MessageDLg('No image in the test database. Click Load image to load an image.',mtInformation,[mbOK],0);
+exit;
+end;
+
+ms.Position := 0;
+
+pic := TJPEGImage.Create;
+pic.LoadFromStream(ms);
+
+self.Image1.Picture.Graphic := pic;
+
+pic.Free;
+
+finally
+sltb.Free;
+end;
+
+finally
+sldb.Free;
+
+end;
+
+
+end;
+
+end.