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/*
* SPDX-FileCopyrightText: 2014-2016 Ivan Cukic <ivan.cukic@kde.org>
*
* SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
*/
#include "Database.h"
#include <common/database/schema/ResourcesDatabaseSchema.h>
#include <utils/d_ptr_implementation.h>
#include <QDebug>
#include <QSqlDatabase>
#include <QSqlDriver>
#include <QSqlError>
#include <QSqlField>
#include <QThread>
#include <map>
#include <mutex>
namespace Common
{
namespace
{
#ifdef QT_DEBUG
QString lastExecutedQuery;
#endif
std::mutex databases_mutex;
struct DatabaseInfo {
Qt::HANDLE thread;
Database::OpenMode openMode;
};
bool operator<(const DatabaseInfo &left, const DatabaseInfo &right)
{
return left.thread < right.thread ? true : left.thread > right.thread ? false : left.openMode < right.openMode;
}
std::map<DatabaseInfo, std::weak_ptr<Database>> databases;
};
class QSqlDatabaseWrapper
{
private:
QSqlDatabase m_database;
bool m_open;
QString m_connectionName;
public:
QSqlDatabaseWrapper(const DatabaseInfo &info)
: m_open(false)
{
m_connectionName = "kactivities_db_resources_"
// Adding the thread number to the database name
+ QString::number((quintptr)info.thread)
// And whether it is read-only or read-write
+ (info.openMode == Database::ReadOnly ? "_readonly" : "_readwrite");
m_database = QSqlDatabase::contains(m_connectionName) ? QSqlDatabase::database(m_connectionName)
: QSqlDatabase::addDatabase(QStringLiteral("QSQLITE"), m_connectionName);
if (info.openMode == Database::ReadOnly) {
m_database.setConnectOptions(QStringLiteral("QSQLITE_OPEN_READONLY"));
}
// We are allowing the database file to be overridden mostly for testing purposes
m_database.setDatabaseName(ResourcesDatabaseSchema::path());
m_open = m_database.open();
if (!m_open) {
qWarning() << "KActivities: Database is not open: " << m_database.connectionName() << m_database.databaseName() << m_database.lastError();
if (info.openMode == Database::ReadWrite) {
qFatal("KActivities: Opening the database in RW mode should always succeed");
}
}
}
~QSqlDatabaseWrapper()
{
qDebug() << "Closing SQL connection: " << m_connectionName;
}
QSqlDatabase &get()
{
return m_database;
}
bool isOpen() const
{
return m_open;
}
QString connectionName() const
{
return m_connectionName;
}
};
class Database::Private
{
public:
Private()
{
}
QSqlQuery query(const QString &query)
{
return database ? QSqlQuery(query, database->get()) : QSqlQuery();
}
QSqlQuery query()
{
return database ? QSqlQuery(database->get()) : QSqlQuery();
}
QScopedPointer<QSqlDatabaseWrapper> database;
};
Database::Locker::Locker(Database &database)
: m_database(database.d->database->get())
{
m_database.transaction();
}
Database::Locker::~Locker()
{
m_database.commit();
}
Database::Ptr Database::instance(Source source, OpenMode openMode)
{
Q_UNUSED(source) // for the time being
std::lock_guard<std::mutex> lock(databases_mutex);
// We are saving instances per thread and per read/write mode
DatabaseInfo info;
info.thread = QThread::currentThreadId();
info.openMode = openMode;
// Do we have an instance matching the request?
auto search = databases.find(info);
if (search != databases.end()) {
auto ptr = search->second.lock();
if (ptr) {
return ptr;
}
}
// Creating a new database instance
auto ptr = std::make_shared<Database>();
ptr->d->database.reset(new QSqlDatabaseWrapper(info));
if (!ptr->d->database->isOpen()) {
return nullptr;
}
databases[info] = ptr;
if (info.openMode == ReadOnly) {
// From now on, only SELECT queries will work
ptr->setPragma(QStringLiteral("query_only = 1"));
// These should not make any difference
ptr->setPragma(QStringLiteral("synchronous = 0"));
} else {
// Using the write-ahead log and sync = NORMAL for faster writes
ptr->setPragma(QStringLiteral("synchronous = 1"));
}
// Maybe we should use the write-ahead log
auto walResult = ptr->pragma(QStringLiteral("journal_mode = WAL"));
if (walResult != "wal") {
qFatal(
"KActivities: Database can not be opened in WAL mode. Check the "
"SQLite version (required >3.7.0). And whether your filesystem "
"supports shared memory");
}
// We don't have a big database, lets flush the WAL when
// it reaches 400k, not 4M as is default
ptr->setPragma(QStringLiteral("wal_autocheckpoint = 100"));
qDebug() << "KActivities: Database connection: " << ptr->d->database->connectionName()
<< "\n query_only: " << ptr->pragma(QStringLiteral("query_only"))
<< "\n journal_mode: " << ptr->pragma(QStringLiteral("journal_mode"))
<< "\n wal_autocheckpoint: " << ptr->pragma(QStringLiteral("wal_autocheckpoint"))
<< "\n synchronous: " << ptr->pragma(QStringLiteral("synchronous"));
return ptr;
}
Database::Database()
{
}
Database::~Database()
{
}
QSqlQuery Database::createQuery() const
{
return d->query();
}
QString Database::lastQuery() const
{
#ifdef QT_DEBUG
return lastExecutedQuery;
#endif
return QString();
}
QSqlQuery Database::execQuery(const QString &query, bool ignoreErrors) const
{
#ifdef QT_NO_DEBUG
return d->query(query);
#else
auto result = d->query(query);
lastExecutedQuery = query;
if (!ignoreErrors && result.lastError().isValid()) {
qWarning() << "SQL: "
<< "\n error: " << result.lastError() << "\n query: " << query;
}
return result;
#endif
}
QSqlQuery Database::execQueries(const QStringList &queries) const
{
QSqlQuery result;
for (const auto &query : queries) {
result = execQuery(query);
}
return result;
}
void Database::setPragma(const QString &pragma)
{
execQuery(QStringLiteral("PRAGMA ") + pragma);
}
QVariant Database::pragma(const QString &pragma) const
{
return value("PRAGMA " + pragma);
}
QVariant Database::value(const QString &query) const
{
auto result = execQuery(query);
return result.next() ? result.value(0) : QVariant();
}
} // namespace Common
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