qsqldriver.h

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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 QSQLDRIVER_H
#define QSQLDRIVER_H
 
#include <QtSql/qtsqlglobal.h>
#include <QtCore/qobject.h>
#include <QtCore/qstring.h>
#include <QtCore/qstringlist.h>
 
QT_BEGIN_NAMESPACE
 
 
class QSqlDatabase;
class QSqlDriverPrivate;
class QSqlError;
class QSqlField;
class QSqlIndex;
class QSqlRecord;
class QSqlResult;
class QVariant;
 
class Q_SQL_EXPORT QSqlDriver : public QObject
{
    friend class QSqlDatabase;
    friend class QSqlResultPrivate;
    Q_OBJECT
    Q_DECLARE_PRIVATE(QSqlDriver)
 
public:
    enum DriverFeature { Transactions, QuerySize, BLOB, Unicode, PreparedQueries,
                         NamedPlaceholders, PositionalPlaceholders, LastInsertId,
                         BatchOperations, SimpleLocking, LowPrecisionNumbers,
                         EventNotifications, FinishQuery, MultipleResultSets, CancelQuery };
 
    enum StatementType { WhereStatement, SelectStatement, UpdateStatement,
                         InsertStatement, DeleteStatement };
 
    enum IdentifierType { FieldName, TableName };
 
    enum NotificationSource { UnknownSource, SelfSource, OtherSource };
 
    enum DbmsType {
        UnknownDbms,
        MSSqlServer,
        MySqlServer,
        PostgreSQL,
        Oracle,
        Sybase,
        SQLite,
        Interbase,
        DB2,
        MimerSQL,
    };
 
    explicit QSqlDriver(QObject *parent = nullptr);
    ~QSqlDriver();
    virtual bool isOpen() const;
    bool isOpenError() const;
 
    virtual bool beginTransaction();
    virtual bool commitTransaction();
    virtual bool rollbackTransaction();
    virtual QStringList tables(QSql::TableType tableType) const;
    virtual QSqlIndex primaryIndex(const QString &tableName) const;
    virtual QSqlRecord record(const QString &tableName) const;
    virtual QString formatValue(const QSqlField &field, bool trimStrings = false) const;
 
    virtual QString escapeIdentifier(const QString &identifier, IdentifierType type) const;
    virtual QString sqlStatement(StatementType type, const QString &tableName,
                                 const QSqlRecord &rec, bool preparedStatement) const;
 
    QSqlError lastError() const;
 
    virtual QVariant handle() const;
    virtual bool hasFeature(DriverFeature f) const = 0;
    virtual void close() = 0;
    virtual QSqlResult *createResult() const = 0;
 
    virtual bool open(const QString &db,
                      const QString &user = QString(),
                      const QString &password = QString(),
                      const QString &host = QString(),
                      int port = -1,
                      const QString &connOpts = QString()) = 0;
    virtual bool subscribeToNotification(const QString &name);
    virtual bool unsubscribeFromNotification(const QString &name);
    virtual QStringList subscribedToNotifications() const;
 
    virtual bool isIdentifierEscaped(const QString &identifier, IdentifierType type) const;
    virtual QString stripDelimiters(const QString &identifier, IdentifierType type) const;
 
    void setNumericalPrecisionPolicy(QSql::NumericalPrecisionPolicy precisionPolicy);
    QSql::NumericalPrecisionPolicy numericalPrecisionPolicy() const;
 
    DbmsType dbmsType() const;
    virtual int maximumIdentifierLength(IdentifierType type) const;
public Q_SLOTS:
    virtual bool cancelQuery();
 
Q_SIGNALS:
    void notification(const QString &name, QSqlDriver::NotificationSource source, const QVariant &payload);
 
protected:
    QSqlDriver(QSqlDriverPrivate &dd, QObject *parent = nullptr);
    virtual void setOpen(bool o);
    virtual void setOpenError(bool e);
    virtual void setLastError(const QSqlError& e);
 
 
private:
    Q_DISABLE_COPY(QSqlDriver)
};
 
QT_END_NAMESPACE
 
#endif // QSQLDRIVER_H