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|
unit UDataBase;
interface
{$IFDEF FPC}
{$MODE Delphi}
{$ENDIF}
{$I switches.inc}
uses USongs,
USong,
SQLiteTable3;
//--------------------
//DataBaseSystem - Class including all DB Methods
//--------------------
type
TStatResult = record
case Typ: Byte of
0: (Singer: ShortString;
Score: Word;
Difficulty: Byte;
SongArtist: ShortString;
SongTitle: ShortString);
1: (Player: ShortString;
AverageScore: Word);
2: (Artist: ShortString;
Title: ShortString;
TimesSung: Word);
3: (ArtistName: ShortString;
TimesSungTot: Word);
end;
AStatResult = array of TStatResult;
(*
0: (Singer: WideString;
Score: Word;
Difficulty: Byte;
SongArtist: WideString;
SongTitle: WideString);
1: (Player: WideString;
AverageScore: Word);
2: (Artist: WideString;
Title: WideString;
TimesSung: Word);
3: (ArtistName: WideString;
TimesSungTot: Word);
*)
TDataBaseSystem = class
private
ScoreDB: TSqliteDatabase;
fFilename: string;
public
property Filename: string read fFilename;
destructor Destroy; override;
procedure Init(const Filename: string);
procedure ReadScore(Song: TSong);
procedure AddScore(Song: TSong; Level: integer; const Name: WideString; Score: integer);
procedure WriteScore(Song: TSong);
function GetStats(var Stats: AStatResult; Typ, Count: Byte; Page: Cardinal; Reversed: Boolean): Boolean;
function GetTotalEntrys(Typ: Byte): Cardinal;
function GetStatReset: TDateTime;
end;
var
DataBase: TDataBaseSystem;
implementation
uses
ULog,
StrUtils,
SysUtils;
const
cUS_Scores = 'us_scores';
cUS_Songs = 'us_songs';
cUS_Statistics_Info = 'us_statistics_info';
//--------------------
//Create - Opens Database and Create Tables if not Exist
//--------------------
procedure TDataBaseSystem.Init(const Filename: string);
begin
if Assigned(ScoreDB) then
Exit;
Log.LogStatus('Initializing database: "'+Filename+'"', 'TDataBaseSystem.Init');
try
//Open Database
ScoreDB := TSQLiteDatabase.Create(Filename);
fFilename := Filename;
ScoreDB.ExecSQL('CREATE TABLE IF NOT EXISTS ['+cUS_Scores+'] (' +
'[SongID] INTEGER NOT NULL, ' +
'[Difficulty] INTEGER NOT NULL, ' +
'[Player] TEXT NOT NULL, ' +
'[Score] INTEGER NOT NULL' +
');');
ScoreDB.ExecSQL('CREATE TABLE IF NOT EXISTS ['+cUS_Songs+'] (' +
'[ID] INTEGER PRIMARY KEY, ' +
'[Artist] TEXT NOT NULL, ' +
'[Title] TEXT NOT NULL, ' +
'[TimesPlayed] INTEGER NOT NULL' +
');');
if not ScoreDB.TableExists(cUS_Statistics_Info) then
begin
ScoreDB.ExecSQL('CREATE TABLE IF NOT EXISTS ['+cUS_Statistics_Info+'] (' +
'[ResetTime] TEXT' +
');');
ScoreDB.ExecSQL('INSERT INTO ['+cUS_Statistics_Info+'] ' +
'([ResetTime]) VALUES ' +
'('''+DateTimeToStr(now)+''');');
end;
except
on E: Exception do
begin
Log.LogError(E.Message, 'TDataBaseSystem.Init');
FreeAndNil(ScoreDB);
end;
end;
end;
//--------------------
//Destroy - Frees Database
//--------------------
destructor TDataBaseSystem.Destroy;
begin
Log.LogInfo('TDataBaseSystem.Free', 'TDataBaseSystem.Destroy');
ScoreDB.Free;
inherited;
end;
//--------------------
//ReadScore - Read Scores into SongArray
//--------------------
procedure TDataBaseSystem.ReadScore(Song: TSong);
var
TableData: TSqliteTable;
Difficulty: Integer;
begin
if not Assigned(ScoreDB) then
Exit;
TableData := nil;
try
// Search Song in DB
TableData := ScoreDB.GetTable(
'SELECT [Difficulty], [Player], [Score] FROM ['+cUS_Scores+'] ' +
'WHERE [SongID] = (' +
'SELECT [ID] FROM ['+cUS_Songs+'] ' +
'WHERE [Artist] = ? AND [Title] = ? ' +
'LIMIT 1) ' +
'ORDER BY [Score] DESC LIMIT 15',
[UTF8Encode(Song.Artist), UTF8Encode(Song.Title)]);
// Empty Old Scores
SetLength(Song.Score[0], 0);
SetLength(Song.Score[1], 0);
SetLength(Song.Score[2], 0);
// Go through all Entrys
while (not TableData.EOF) do
begin
// Add one Entry to Array
Difficulty := StrToIntDef(TableData.FieldAsString(TableData.FieldIndex['Difficulty']), -1);
if ((Difficulty >= 0) and (Difficulty <= 2)) and
(Length(Song.Score[Difficulty]) < 5) then
begin
SetLength(Song.Score[Difficulty], Length(Song.Score[Difficulty]) + 1);
Song.Score[Difficulty, High(Song.Score[Difficulty])].Name :=
UTF8Decode(TableData.FieldAsString(TableData.FieldIndex['Player']));
Song.Score[Difficulty, High(Song.Score[Difficulty])].Score :=
StrtoInt(TableData.FieldAsString(TableData.FieldIndex['Score']));
end;
TableData.Next;
end; // while
except
for Difficulty := 0 to 2 do
begin
SetLength(Song.Score[Difficulty], 1);
Song.Score[Difficulty, 1].Name := 'Error Reading ScoreDB';
end;
end;
TableData.Free;
end;
//--------------------
//AddScore - Add one new Score to DB
//--------------------
procedure TDataBaseSystem.AddScore(Song: TSong; Level: integer; const Name: WideString; Score: integer);
var
ID: Integer;
TableData: TSQLiteTable;
begin
if not Assigned(ScoreDB) then
Exit;
//Prevent 0 Scores from being added
if (Score <= 0) then
Exit;
TableData := nil;
try
ID := ScoreDB.GetTableValue(
'SELECT [ID] FROM ['+cUS_Songs+'] ' +
'WHERE [Artist] = ? AND [Title] = ?',
[UTF8Encode(Song.Artist), UTF8Encode(Song.Title)]);
if ID = 0 then //Song doesn't exist -> Create
begin
ScoreDB.ExecSQL (
'INSERT INTO ['+cUS_Songs+'] ' +
'([ID], [Artist], [Title], [TimesPlayed]) VALUES ' +
'(NULL, ?, ?, 0);',
[UTF8Encode(Song.Artist), UTF8Encode(Song.Title)]);
ID := ScoreDB.GetTableValue(
'SELECT [ID] FROM ['+cUS_Songs+'] ' +
'WHERE [Artist] = ? AND [Title] = ?',
[UTF8Encode(Song.Artist), UTF8Encode(Song.Title)]);
if ID = 0 then //Could not Create Table
Exit;
end;
//Create new Entry
ScoreDB.ExecSQL(
'INSERT INTO ['+cUS_Scores+'] ' +
'([SongID] ,[Difficulty], [Player], [Score]) VALUES ' +
'(?, ?, ?, ?);',
[ID, Level, UTF8Encode(Name), Score]);
//Delete Last Position when there are more than 5 Entrys - Fixes Crash when there are > 5 ScoreEntrys
TableData := ScoreDB.GetTable(
'SELECT [Player], [Score] FROM ['+cUS_Scores+'] ' +
'WHERE [SongID] = ' + InttoStr(ID) + ' AND ' +
'[Difficulty] = ' + InttoStr(Level) +' ' +
'ORDER BY [Score] DESC LIMIT -1 OFFSET 5');
while not TableData.EOF do
begin
ScoreDB.ExecSQL(
'DELETE FROM ['+cUS_Scores+'] ' +
'WHERE [SongID] = ' + InttoStr(ID) + ' AND ' +
'[Difficulty] = ' + InttoStr(Level) +' AND ' +
'[Player] = ? AND [Score] = ?',
[TableData.FieldAsString(TableData.FieldIndex['Player']),
TableData.FieldAsString(TableData.FieldIndex['Score'])]);
TableData.Next;
end;
except on E: Exception do
Log.LogError(E.Message, 'TDataBaseSystem.AddScore');
end;
TableData.Free;
end;
//--------------------
//WriteScore - Not needed with new System; But used for Increment Played Count
//--------------------
procedure TDataBaseSystem.WriteScore(Song: TSong);
begin
if not Assigned(ScoreDB) then
Exit;
try
//Increase TimesPlayed
ScoreDB.ExecSQL(
'UPDATE ['+cUS_Songs+'] ' +
'SET [TimesPlayed] = [TimesPlayed] + 1 ' +
'WHERE [Title] = ? AND [Artist] = ?;',
[UTF8Encode(Song.Title), UTF8Encode(Song.Artist)]);
except on E: Exception do
Log.LogError(E.Message, 'TDataBaseSystem.WriteScore');
end;
end;
//--------------------
//GetStats - Write some Stats to Array, Returns True if Chossen Page has Entrys
//Case Typ of
//0 - Best Scores
//1 - Best Singers
//2 - Most sung Songs
//3 - Most popular Band
//--------------------
function TDataBaseSystem.GetStats(var Stats: AStatResult; Typ, Count: Byte; Page: Cardinal; Reversed: Boolean): Boolean;
var
Query: String;
TableData: TSqliteTable;
begin
Result := False;
if not Assigned(ScoreDB) then
Exit;
if (Length(Stats) < Count) then
Exit;
{Todo: Add Prevention that only Players with more than 5 Scores are Selected at Typ 2}
//Create Query
case Typ of
0: begin
Query := 'SELECT [Player], [Difficulty], [Score], [Artist], [Title] FROM ['+cUS_Scores+'] ' +
'INNER JOIN ['+cUS_Songs+'] ON ([SongID] = [ID]) ORDER BY [Score]';
end;
1: begin
Query := 'SELECT [Player], ROUND(AVG([Score])) FROM ['+cUS_Scores+'] ' +
'GROUP BY [Player] ORDER BY AVG([Score])';
end;
2: begin
Query := 'SELECT [Artist], [Title], [TimesPlayed] FROM ['+cUS_Songs+'] ' +
'ORDER BY [TimesPlayed]';
end;
3: begin
Query := 'SELECT [Artist], SUM([TimesPlayed]) FROM ['+cUS_Songs+'] ' +
'GROUP BY [Artist] ORDER BY SUM([TimesPlayed])';
end;
end;
//Add Order Direction
Query := Query + IfThen(Reversed, ' ASC', ' DESC');
//Add Limit
Query := Query + ' LIMIT ' + InttoStr(Count * Page) + ', ' + InttoStr(Count) + ';';
//Execute Query
try
TableData := ScoreDB.GetTable(Query);
except
on E: Exception do
begin
Log.LogError(E.Message, 'TDataBaseSystem.GetStats');
Exit;
end;
end;
//if result is empty -> Exit
if (TableData.RowCount < 1) then
Exit;
//Copy Result to Stats Array
while not TableData.EOF do
begin
Stats[TableData.Row].Typ := Typ;
case Typ of
0:begin
Stats[TableData.Row].Singer := UTF8Decode(TableData.Fields[0]);
Stats[TableData.Row].Difficulty := StrtoIntDef(TableData.Fields[1], 0);
Stats[TableData.Row].Score := StrtoIntDef(TableData.Fields[2], 0){TableData.FieldAsInteger(2)};
Stats[TableData.Row].SongArtist := UTF8Decode(TableData.Fields[3]);
Stats[TableData.Row].SongTitle := UTF8Decode(TableData.Fields[4]);
end;
1:begin
Stats[TableData.Row].Player := UTF8Decode(TableData.Fields[0]);
Stats[TableData.Row].AverageScore := StrtoIntDef(TableData.Fields[1], 0);
end;
2:begin
Stats[TableData.Row].Artist := UTF8Decode(TableData.Fields[0]);
Stats[TableData.Row].Title := UTF8Decode(TableData.Fields[1]);
Stats[TableData.Row].TimesSung := StrtoIntDef(TableData.Fields[2], 0);
end;
3:begin
Stats[TableData.Row].ArtistName := UTF8Decode(TableData.Fields[0]);
Stats[TableData.Row].TimesSungTot := StrtoIntDef(TableData.Fields[1], 0);
end;
end;
TableData.Next;
end;
TableData.Free;
Result := True;
end;
//--------------------
//GetTotalEntrys - Get Total Num of entrys for a Stats Query
//--------------------
function TDataBaseSystem.GetTotalEntrys(Typ: Byte): Cardinal;
var
Query: String;
begin
Result := 0;
if not Assigned(ScoreDB) then
Exit;
try
//Create Query
case Typ of
0: Query := 'SELECT COUNT([SongID]) FROM ['+cUS_Scores+'];';
1: Query := 'SELECT COUNT(DISTINCT [Player]) FROM ['+cUS_Scores+'];';
2: Query := 'SELECT COUNT([ID]) FROM ['+cUS_Songs+'];';
3: Query := 'SELECT COUNT(DISTINCT [Artist]) FROM ['+cUS_Songs+'];';
end;
Result := ScoreDB.GetTableValue(Query);
except on E: Exception do
Log.LogError(E.Message, 'TDataBaseSystem.GetTotalEntrys');
end;
end;
//--------------------
//GetStatReset - Get reset date of statistic data
//--------------------
function TDataBaseSystem.GetStatReset: TDateTime;
var
Query: string;
TableData: TSQLiteTable;
begin
Result := 0;
if not Assigned(ScoreDB) then
Exit;
TableData := nil;
try
Query := 'SELECT [ResetTime] FROM ['+cUS_Statistics_Info+'];';
TableData := ScoreDB.GetTable(Query);
Result := StrToDateTime(TableData.Fields[0]);
except on E: Exception do
Log.LogError(E.Message, 'TDataBaseSystem.GetStatReset');
end;
TableData.Free;
end;
end.
|