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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
#include "sqlitesessions.h"
#include "sqlitereadstatement.h"
#include "sqlitesessionchangeset.h"
#include "sqlitetable.h"
#include <sqlite.h>
#include <memory>
namespace Sqlite {
namespace {
void checkResultCode(int resultCode)
{
switch (resultCode) {
case SQLITE_NOMEM:
throw std::bad_alloc();
case SQLITE_SCHEMA:
throw CannotApplyChangeSet("Cannot apply change set!");
case SQLITE_MISUSE:
throw ChangeSetIsMisused("Change set is misused!");
}
if (resultCode != SQLITE_OK)
throw UnknowError("Unknow exception");
}
int xConflict(void *, int conflict, sqlite3_changeset_iter *)
{
switch (conflict) {
case SQLITE_CHANGESET_DATA:
return SQLITE_CHANGESET_REPLACE;
case SQLITE_CHANGESET_NOTFOUND:
return SQLITE_CHANGESET_OMIT;
case SQLITE_CHANGESET_CONFLICT:
return SQLITE_CHANGESET_REPLACE;
case SQLITE_CHANGESET_CONSTRAINT:
return SQLITE_CHANGESET_OMIT;
case SQLITE_CHANGESET_FOREIGN_KEY:
return SQLITE_CHANGESET_OMIT;
}
return SQLITE_CHANGESET_ABORT;
}
} // namespace
void Sessions::attachTables(const Utils::SmallStringVector &tableNames)
{
for (Utils::SmallStringView tableName : tableNames) {
int resultCode = sqlite3session_attach(session.get(), std::string(tableName).c_str());
checkResultCode(resultCode);
}
}
Sessions::~Sessions() = default;
void Sessions::setAttachedTables(Utils::SmallStringVector tables)
{
tableNames = std::move(tables);
}
void Sessions::create()
{
sqlite3_session *newSession = nullptr;
int resultCode = sqlite3session_create(database.backend().sqliteDatabaseHandle(),
std::string(databaseName.data()).c_str(),
&newSession);
session.reset(newSession);
checkResultCode(resultCode);
attachTables(tableNames);
}
void Sessions::commit()
{
if (session && !sqlite3session_isempty(session.get())) {
SessionChangeSet changeSet{*this};
insertSession.write(changeSet.asBlobView());
}
session.reset();
}
void Sessions::rollback()
{
session.reset();
}
void Internal::SessionsBase::createSessionTable(Database &database)
{
Sqlite::Table table;
table.setUseIfNotExists(true);
table.setName(sessionsTableName);
table.addColumn("id", Sqlite::ColumnType::Integer, {Sqlite::PrimaryKey{AutoIncrement::Yes}});
table.addColumn("changeset", Sqlite::ColumnType::Blob);
table.initialize(database);
}
void Sessions::revert()
{
ReadStatement<1> selectChangeSets{Utils::PathString::join({"SELECT changeset FROM ",
sessionsTableName,
" ORDER BY id DESC"}),
database};
auto changeSets = selectChangeSets.values<SessionChangeSet>(1024);
for (auto &changeSet : changeSets) {
int resultCode = sqlite3changeset_apply_v2(database.backend().sqliteDatabaseHandle(),
changeSet.size(),
changeSet.data(),
nullptr,
xConflict,
nullptr,
nullptr,
nullptr,
SQLITE_CHANGESETAPPLY_INVERT
| SQLITE_CHANGESETAPPLY_NOSAVEPOINT);
checkResultCode(resultCode);
}
}
void Sessions::apply()
{
ReadStatement<1> selectChangeSets{Utils::PathString::join({"SELECT changeset FROM ",
sessionsTableName,
" ORDER BY id"}),
database};
auto changeSets = selectChangeSets.values<SessionChangeSet>(1024);
for (auto &changeSet : changeSets) {
int resultCode = sqlite3changeset_apply_v2(database.backend().sqliteDatabaseHandle(),
changeSet.size(),
changeSet.data(),
nullptr,
xConflict,
nullptr,
nullptr,
nullptr,
SQLITE_CHANGESETAPPLY_NOSAVEPOINT);
checkResultCode(resultCode);
}
}
void Sessions::applyAndUpdateSessions()
{
create();
apply();
deleteAll();
commit();
}
void Sessions::deleteAll()
{
WriteStatement<0>{Utils::SmallString::join({"DELETE FROM ", sessionsTableName}), database}.execute();
}
SessionChangeSets Sessions::changeSets() const
{
ReadStatement<1> selectChangeSets{Utils::PathString::join({"SELECT changeset FROM ",
sessionsTableName,
" ORDER BY id DESC"}),
database};
return selectChangeSets.values<SessionChangeSet>(1024);
}
} // namespace Sqlite
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