172 lines
5.2 KiB
C++
172 lines
5.2 KiB
C++
/*
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* Strawberry Music Player
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* This file was part of Clementine.
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* Copyright 2010, David Sansome <me@davidsansome.com>
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*
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* Strawberry is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Strawberry is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Strawberry. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef DATABASE_H
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#define DATABASE_H
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#include "config.h"
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#include <stdbool.h>
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#include <sqlite3.h>
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#include <QtGlobal>
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#include <QObject>
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#include <QMutex>
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#include <QByteArray>
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#include <QList>
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#include <QMap>
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#include <QSqlDatabase>
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#include <QSqlQuery>
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#include <QString>
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#include <QStringList>
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extern "C" {
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struct sqlite3_tokenizer;
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struct sqlite3_tokenizer_cursor;
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struct sqlite3_tokenizer_module;
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}
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class Application;
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class Database : public QObject {
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Q_OBJECT
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public:
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Database(Application *app, QObject *parent = nullptr, const QString &database_name = QString());
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struct AttachedDatabase {
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AttachedDatabase() {}
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AttachedDatabase(const QString &filename, const QString &schema, bool is_temporary)
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: filename_(filename), schema_(schema), is_temporary_(is_temporary) {}
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QString filename_;
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QString schema_;
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bool is_temporary_;
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};
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static const int kSchemaVersion;
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static const char *kDatabaseFilename;
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static const char *kMagicAllSongsTables;
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QSqlDatabase Connect();
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bool CheckErrors(const QSqlQuery &query);
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QMutex *Mutex() { return &mutex_; }
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void RecreateAttachedDb(const QString &database_name);
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void ExecSchemaCommands(QSqlDatabase &db, const QString &schema, int schema_version, bool in_transaction = false);
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int startup_schema_version() const { return startup_schema_version_; }
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int current_schema_version() const { return kSchemaVersion; }
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void AttachDatabase(const QString &database_name, const AttachedDatabase &database);
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void AttachDatabaseOnDbConnection(const QString &database_name, const AttachedDatabase &database, QSqlDatabase &db);
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void DetachDatabase(const QString &database_name);
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signals:
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void Error(const QString &message);
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public slots:
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void DoBackup();
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private:
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void UpdateMainSchema(QSqlDatabase *db);
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void ExecSchemaCommandsFromFile(QSqlDatabase &db, const QString &filename, int schema_version, bool in_transaction = false);
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void ExecSongTablesCommands(QSqlDatabase &db, const QStringList &song_tables, const QStringList &commands);
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void UpdateDatabaseSchema(int version, QSqlDatabase &db);
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void UrlEncodeFilenameColumn(const QString &table, QSqlDatabase &db);
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QStringList SongsTables(QSqlDatabase &db, int schema_version) const;
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bool IntegrityCheck(QSqlDatabase db);
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void BackupFile(const QString &filename);
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bool OpenDatabase(const QString &filename, sqlite3 **connection) const;
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Application *app_;
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// Alias -> filename
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QMap<QString, AttachedDatabase> attached_databases_;
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QString directory_;
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QMutex connect_mutex_;
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QMutex mutex_;
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// This ID makes the QSqlDatabase name unique to the object as well as the thread
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int connection_id_;
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static QMutex sNextConnectionIdMutex;
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static int sNextConnectionId;
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// Used by tests
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QString injected_database_name_;
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uint query_hash_;
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QStringList query_cache_;
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// This is the schema version of Strawberry's DB from the app's last run.
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int startup_schema_version_;
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// Do static initialisation like loading sqlite functions.
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static void StaticInit();
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typedef int (*Sqlite3CreateFunc)(sqlite3*, const char*, int, int, void*, void (*)(sqlite3_context*, int, sqlite3_value**), void (*)(sqlite3_context*, int, sqlite3_value**), void (*)(sqlite3_context*));
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static sqlite3_tokenizer_module *sFTSTokenizer;
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static int FTSCreate(int argc, const char *const *argv, sqlite3_tokenizer **tokenizer);
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static int FTSDestroy(sqlite3_tokenizer *tokenizer);
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static int FTSOpen(sqlite3_tokenizer *tokenizer, const char *input, int bytes, sqlite3_tokenizer_cursor **cursor);
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static int FTSClose(sqlite3_tokenizer_cursor *cursor);
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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;
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int start_offset;
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int end_offset;
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};
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// Based on sqlite3_tokenizer.
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struct UnicodeTokenizer {
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const sqlite3_tokenizer_module *pModule;
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};
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struct UnicodeTokenizerCursor {
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const sqlite3_tokenizer *pTokenizer;
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QList<Token> tokens;
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int position;
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QByteArray current_utf8;
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};
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};
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class MemoryDatabase : public Database {
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public:
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MemoryDatabase(Application *app, QObject *parent = nullptr)
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: Database(app, parent, ":memory:") {}
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~MemoryDatabase() {
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// Make sure Qt doesn't reuse the same database
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QSqlDatabase::removeDatabase(Connect().connectionName());
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}
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};
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#endif // DATABASE_H
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