Clementine-audio-player-Mac.../src/core/database.h

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/* This file is part of Clementine.
Copyright 2010, David Sansome <me@davidsansome.com>
Clementine is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Clementine is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Clementine. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef DATABASE_H
#define DATABASE_H
#include <QMap>
#include <QMutex>
#include <QObject>
#include <QSqlDatabase>
#include <QSqlError>
#include <QStringList>
#include <sqlite3.h>
#include "gtest/gtest_prod.h"
extern "C" {
struct sqlite3_tokenizer;
struct sqlite3_tokenizer_cursor;
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struct sqlite3_tokenizer_module;
}
class Database : public QObject {
Q_OBJECT
public:
Database(QObject* parent = 0, const QString& database_name = QString());
static const int kSchemaVersion;
static const char* kDatabaseFilename;
static const char* kMagicAllSongsTables;
void Stop() {}
QSqlDatabase Connect();
bool CheckErrors(const QSqlError& error);
QMutex* Mutex() { return &mutex_; }
void RecreateAttachedDb(const QString& database_name);
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void ExecFromFile(const QString& filename, QSqlDatabase &db);
void ExecCommands(const QString& commands, QSqlDatabase &db);
signals:
void Error(const QString& message);
private:
void UpdateDatabaseSchema(int version, QSqlDatabase& db);
QStringList SongsTables(QSqlDatabase& db) const;
struct AttachedDatabase {
AttachedDatabase() {}
AttachedDatabase(const QString& filename, const QString& schema)
: filename_(filename), schema_(schema) {}
QString filename_;
QString schema_;
};
// Alias -> filename
QMap<QString, AttachedDatabase> attached_databases_;
QString directory_;
QMutex connect_mutex_;
QMutex mutex_;
// This ID makes the QSqlDatabase name unique to the object as well as the
// thread
int connection_id_;
static QMutex sNextConnectionIdMutex;
static int sNextConnectionId;
// Used by tests
QString injected_database_name_;
uint query_hash_;
QStringList query_cache_;
FRIEND_TEST(DatabaseTest, LikeWorksWithAllAscii);
FRIEND_TEST(DatabaseTest, LikeWorksWithUnicode);
FRIEND_TEST(DatabaseTest, LikeAsciiCaseInsensitive);
FRIEND_TEST(DatabaseTest, LikeUnicodeCaseInsensitive);
FRIEND_TEST(DatabaseTest, LikePerformance);
FRIEND_TEST(DatabaseTest, LikeCacheInvalidated);
FRIEND_TEST(DatabaseTest, LikeQuerySplit);
FRIEND_TEST(DatabaseTest, LikeDecomposes);
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FRIEND_TEST(DatabaseTest, FTSOpenParsesSimpleInput);
FRIEND_TEST(DatabaseTest, FTSOpenParsesUTF8Input);
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FRIEND_TEST(DatabaseTest, FTSOpenParsesMultipleTokens);
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FRIEND_TEST(DatabaseTest, FTSCursorWorks);
FRIEND_TEST(DatabaseTest, FTSOpenLeavesCyrillicQueries);
// Do static initialisation like loading sqlite functions.
static void StaticInit();
// Custom LIKE() function for sqlite.
bool Like(const char* needle, const char* haystack);
static void SqliteLike(sqlite3_context* context, int argc, sqlite3_value** argv);
typedef int (*Sqlite3CreateFunc) (
sqlite3*, const char*, int, int, void*,
void (*) (sqlite3_context*, int, sqlite3_value**),
void (*) (sqlite3_context*, int, sqlite3_value**),
void (*) (sqlite3_context*));
// Sqlite3 functions. These will be loaded from the sqlite3 plugin.
static Sqlite3CreateFunc _sqlite3_create_function;
static int (*_sqlite3_value_type) (sqlite3_value*);
static sqlite_int64 (*_sqlite3_value_int64) (sqlite3_value*);
static const uchar* (*_sqlite3_value_text) (sqlite3_value*);
static void (*_sqlite3_result_int64) (sqlite3_context*, sqlite_int64);
static void* (*_sqlite3_user_data) (sqlite3_context*);
static bool sStaticInitDone;
static bool sLoadedSqliteSymbols;
static sqlite3_tokenizer_module* sFTSTokenizer;
static int FTSCreate(int argc, const char* const* argv, sqlite3_tokenizer** tokenizer);
static int FTSDestroy(sqlite3_tokenizer* tokenizer);
static int FTSOpen(sqlite3_tokenizer* tokenizer,
const char* input,
int bytes,
sqlite3_tokenizer_cursor** cursor);
static int FTSClose(sqlite3_tokenizer_cursor* cursor);
static int FTSNext(sqlite3_tokenizer_cursor* cursor,
const char** token,
int* bytes,
int* start_offset,
int* end_offset,
int* position);
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struct Token {
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Token(const QString& token, int start, int end);
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QString token;
int start_offset;
int end_offset;
};
// Based on sqlite3_tokenizer.
struct UnicodeTokenizer {
const sqlite3_tokenizer_module* pModule;
};
struct UnicodeTokenizerCursor {
const sqlite3_tokenizer* pTokenizer;
QList<Token> tokens;
int position;
QByteArray current_utf8;
};
};
class MemoryDatabase : public Database {
public:
MemoryDatabase(QObject* parent = 0) : Database(parent, ":memory:") {}
~MemoryDatabase() {
// Make sure Qt doesn't reuse the same database
QSqlDatabase::removeDatabase(Connect().connectionName());
}
};
#endif // DATABASE_H