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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QSQLQUERYMODEL_P_H
#define QSQLQUERYMODEL_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of qsql*model.h . This header file may change from version to version
// without notice, or even be removed.
//
// We mean it.
//
#include <QtSql/private/qtsqlglobal_p.h>
#include "private/qabstractitemmodel_p.h"
#include "QtSql/qsqlerror.h"
#include "QtSql/qsqlquery.h"
#include "QtSql/qsqlrecord.h"
#include "QtCore/qhash.h"
#include "QtCore/qlist.h"
#include "QtCore/qvarlengtharray.h"
QT_REQUIRE_CONFIG(sqlmodel);
QT_BEGIN_NAMESPACE
class QSqlQueryModelPrivate: public QAbstractItemModelPrivate
{
Q_DECLARE_PUBLIC(QSqlQueryModel)
public:
QSqlQueryModelPrivate() : atEnd(false), nestedResetLevel(0) {}
~QSqlQueryModelPrivate();
void prefetch(int);
void initColOffsets(int size);
int columnInQuery(int modelColumn) const;
mutable QSqlQuery query = { QSqlQuery(nullptr) };
mutable QSqlError error;
QModelIndex bottom;
QSqlRecord rec;
uint atEnd : 1;
QList<QHash<int, QVariant>> headers;
QVarLengthArray<int, 56> colOffsets; // used to calculate indexInQuery of columns
int nestedResetLevel;
};
// helpers for building SQL expressions
class QSqlQueryModelSql
{
public:
// SQL keywords
inline const static QLatin1StringView as() { return QLatin1StringView("AS"); }
inline const static QLatin1StringView asc() { return QLatin1StringView("ASC"); }
inline const static QLatin1StringView comma() { return QLatin1StringView(","); }
inline const static QLatin1StringView desc() { return QLatin1StringView("DESC"); }
inline const static QLatin1StringView eq() { return QLatin1StringView("="); }
// "and" is a C++ keyword
inline const static QLatin1StringView et() { return QLatin1StringView("AND"); }
inline const static QLatin1StringView from() { return QLatin1StringView("FROM"); }
inline const static QLatin1StringView leftJoin() { return QLatin1StringView("LEFT JOIN"); }
inline const static QLatin1StringView on() { return QLatin1StringView("ON"); }
inline const static QLatin1StringView orderBy() { return QLatin1StringView("ORDER BY"); }
inline const static QLatin1StringView parenClose() { return QLatin1StringView(")"); }
inline const static QLatin1StringView parenOpen() { return QLatin1StringView("("); }
inline const static QLatin1StringView select() { return QLatin1StringView("SELECT"); }
inline const static QLatin1StringView sp() { return QLatin1StringView(" "); }
inline const static QLatin1StringView where() { return QLatin1StringView("WHERE"); }
// Build expressions based on key words
inline const static QString as(const QString &a, const QString &b) { return b.isEmpty() ? a : concat(concat(a, as()), b); }
inline const static QString asc(const QString &s) { return concat(s, asc()); }
inline const static QString comma(const QString &a, const QString &b) { return a.isEmpty() ? b : b.isEmpty() ? a : QString(a).append(comma()).append(b); }
inline const static QString concat(const QString &a, const QString &b) { return a.isEmpty() ? b : b.isEmpty() ? a : QString(a).append(sp()).append(b); }
inline const static QString desc(const QString &s) { return concat(s, desc()); }
inline const static QString eq(const QString &a, const QString &b) { return QString(a).append(eq()).append(b); }
inline const static QString et(const QString &a, const QString &b) { return a.isEmpty() ? b : b.isEmpty() ? a : concat(concat(a, et()), b); }
inline const static QString from(const QString &s) { return concat(from(), s); }
inline const static QString leftJoin(const QString &s) { return concat(leftJoin(), s); }
inline const static QString on(const QString &s) { return concat(on(), s); }
inline const static QString orderBy(const QString &s) { return s.isEmpty() ? s : concat(orderBy(), s); }
inline const static QString paren(const QString &s) { return s.isEmpty() ? s : parenOpen() + s + parenClose(); }
inline const static QString select(const QString &s) { return concat(select(), s); }
inline const static QString where(const QString &s) { return s.isEmpty() ? s : concat(where(), s); }
};
QT_END_NAMESPACE
#endif // QSQLQUERYMODEL_P_H
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