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Since #983, projectDataBase::newQuery() checked a query with sqlite3_prepare_v2() and sqlite3_stmt_readonly() on the handle of the QSQLITE driver. Those calls go to the libsqlite3 QElectroTech links. The QSQLITE plugin of the Qt online installer does not use that library: it carries its own copy of SQLite, so the handle belongs to another library and the call crashes. #1021 then put newQuery() on every element selection, which is where #1045 hits it. The check now runs the query with PRAGMA query_only set, through the driver. SQLite refuses a write itself, before touching a row, so the CTE prefix #983 closed ("WITH x AS (SELECT 1) DELETE FROM element") stays closed. A refused or failed query comes back empty, because several callers call exec() again on what newQuery() returns, after query_only is off. QElectroTech no longer calls the SQLite C API anywhere. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
44 lines
1.4 KiB
C++
44 lines
1.4 KiB
C++
/*
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Copyright 2006-2026 The QElectroTech Team
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This file is part of QElectroTech.
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QElectroTech 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 2 of the License, or
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(at your option) any later version.
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QElectroTech 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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You should have received a copy of the GNU General Public License
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along with QElectroTech. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef SQLREADONLY_H
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#define SQLREADONLY_H
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#include <QSqlDatabase>
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#include <QSqlQuery>
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#include <QString>
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/**
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Running a piece of SQL only if it reads.
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Deliberately its own translation unit, depending on nothing but Qt SQL:
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it is the enforcement point for every query QElectroTech runs against a
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project database, including queries that arrive from outside the
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application (a .qet file's saved report/table query), so it is worth
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being able to test it in isolation -- see
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tests/qttest/tst_sqlreadonly.cpp, which links this file and nothing
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else of QElectroTech.
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*/
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namespace QETSql {
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QSqlQuery execReadOnly(const QSqlDatabase &db,
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const QString &query,
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QString *error = nullptr);
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}
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#endif // SQLREADONLY_H
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