forked from qt-creator/qt-creator
Sqlite: Add session support
Session are captured by hooking in the sqlite changes. They are saved in blobs and containing inserts, update and deletes. Because the are semantically coupled to translactions we add a Change-Id: Ie095558ebc50601fcaae32958ebeeb98b72d73b9 Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>
This commit is contained in:
Marco Bubke
Tim Jenssen
188
src/libs/sqlite/sqlitesessions.cpp
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188
src/libs/sqlite/sqlitesessions.cpp
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/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of Qt Creator.
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**
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3 as published by the Free Software
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** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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**
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****************************************************************************/
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#include "sqlitesessions.h"
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#include "sqlitereadstatement.h"
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#include "sqlitesessionchangeset.h"
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#include "sqlitetable.h"
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#include <sqlite3ext.h>
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#include <memory>
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namespace Sqlite {
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namespace {
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void checkResultCode(int resultCode)
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{
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switch (resultCode) {
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case SQLITE_NOMEM:
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throw std::bad_alloc();
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case SQLITE_SCHEMA:
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throw CannotApplyChangeSet("Cannot apply change set!");
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case SQLITE_MISUSE:
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throw ChangeSetIsMisused("Change set is misused!");
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}
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if (resultCode != SQLITE_OK)
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throw UnknowError("Unknow exception");
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}
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int xConflict(void *, int conflict, sqlite3_changeset_iter *)
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{
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switch (conflict) {
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case SQLITE_CHANGESET_DATA:
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return SQLITE_CHANGESET_REPLACE;
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case SQLITE_CHANGESET_NOTFOUND:
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return SQLITE_CHANGESET_OMIT;
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case SQLITE_CHANGESET_CONFLICT:
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return SQLITE_CHANGESET_REPLACE;
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case SQLITE_CHANGESET_CONSTRAINT:
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return SQLITE_CHANGESET_OMIT;
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case SQLITE_CHANGESET_FOREIGN_KEY:
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return SQLITE_CHANGESET_OMIT;
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}
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return SQLITE_CHANGESET_ABORT;
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}
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} // namespace
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void Sessions::attachTables(const Utils::SmallStringVector &tableNames)
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{
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for (Utils::SmallStringView tableName : tableNames) {
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int resultCode = sqlite3session_attach(session.get(), tableName.data());
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checkResultCode(resultCode);
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}
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}
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Sessions::~Sessions() = default;
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void Sessions::setAttachedTables(Utils::SmallStringVector tables)
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{
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tableNames = std::move(tables);
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}
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void Sessions::create()
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{
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sqlite3_session *newSession = nullptr;
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int resultCode = sqlite3session_create(database.backend().sqliteDatabaseHandle(),
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databaseName.data(),
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&newSession);
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session.reset(newSession);
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checkResultCode(resultCode);
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attachTables(tableNames);
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}
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void Sessions::commit()
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{
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if (session && !sqlite3session_isempty(session.get())) {
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SessionChangeSet changeSet{*this};
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insertSession.write(changeSet.asSpan());
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}
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session.reset();
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}
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void Sessions::rollback()
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{
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session.reset();
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}
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void Internal::SessionsBase::createSessionTable(Database &database)
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{
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Sqlite::Table table;
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table.setUseIfNotExists(true);
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table.setName(sessionsTableName);
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table.addColumn("id", Sqlite::ColumnType::Integer, {Sqlite::PrimaryKey{AutoIncrement::Yes}});
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table.addColumn("changeset", Sqlite::ColumnType::Blob);
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table.initialize(database);
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}
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void Sessions::revert()
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{
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ReadStatement selectChangeSets{Utils::PathString{"SELECT changeset FROM ",
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sessionsTableName,
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" ORDER BY id DESC"},
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database};
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auto changeSets = selectChangeSets.values<SessionChangeSet>(1024);
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for (auto &changeSet : changeSets) {
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int resultCode = sqlite3changeset_apply_v2(database.backend().sqliteDatabaseHandle(),
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changeSet.size,
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changeSet.data,
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nullptr,
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xConflict,
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nullptr,
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nullptr,
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nullptr,
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SQLITE_CHANGESETAPPLY_INVERT
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| SQLITE_CHANGESETAPPLY_NOSAVEPOINT);
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checkResultCode(resultCode);
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}
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}
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void Sessions::apply()
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{
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ReadStatement selectChangeSets{Utils::PathString{"SELECT changeset FROM ",
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sessionsTableName,
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" ORDER BY id"},
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database};
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auto changeSets = selectChangeSets.values<SessionChangeSet>(1024);
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for (auto &changeSet : changeSets) {
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int resultCode = sqlite3changeset_apply_v2(database.backend().sqliteDatabaseHandle(),
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changeSet.size,
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changeSet.data,
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nullptr,
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xConflict,
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nullptr,
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nullptr,
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nullptr,
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SQLITE_CHANGESETAPPLY_NOSAVEPOINT);
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checkResultCode(resultCode);
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}
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}
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void Sessions::applyAndUpdateSessions()
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{
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create();
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apply();
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deleteAll();
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commit();
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}
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void Sessions::deleteAll()
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{
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WriteStatement{Utils::SmallString{"DELETE FROM ", sessionsTableName}, database}.execute();
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}
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} // namespace Sqlite
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