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diff --git a/dbaccess/source/ui/inc/RTableConnectionData.hxx b/dbaccess/source/ui/inc/RTableConnectionData.hxx
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+++ b/dbaccess/source/ui/inc/RTableConnectionData.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#pragma once
+
+#include "TableConnectionData.hxx"
+#include <com/sun/star/beans/XPropertySet.hpp>
+#include "QEnumTypes.hxx"
+
+namespace dbaui
+{
+    enum class Cardinality {
+        Undefined, OneMany, ManyOne, OneOne
+    };
+
+    class OConnectionLineData;
+    class ORelationTableConnectionData final : public OTableConnectionData
+    {
+        friend bool operator==(const ORelationTableConnectionData& lhs, const ORelationTableConnectionData& rhs);
+
+        ::osl::Mutex    m_aMutex;
+
+        // @see com.sun.star.sdbc.KeyRule
+        sal_Int32 m_nUpdateRules;
+        sal_Int32 m_nDeleteRules;
+        Cardinality m_nCardinality;
+
+        bool checkPrimaryKey(const css::uno::Reference< css::beans::XPropertySet>& i_xTable, EConnectionSide _eEConnectionSide) const;
+        bool IsSourcePrimKey()  const { return checkPrimaryKey(getReferencingTable()->getTable(),JTCS_FROM);    }
+        bool IsDestPrimKey()    const { return checkPrimaryKey(getReferencedTable()->getTable(),JTCS_TO);       }
+
+        ORelationTableConnectionData& operator=( const ORelationTableConnectionData& rConnData );
+    public:
+        ORelationTableConnectionData();
+        ORelationTableConnectionData( const ORelationTableConnectionData& rConnData );
+        ORelationTableConnectionData( const TTableWindowData::value_type& _pReferencingTable,
+                                      const TTableWindowData::value_type& _pReferencedTable,
+                                      const OUString& rConnName = OUString() );
+        virtual ~ORelationTableConnectionData() override;
+
+        virtual void CopyFrom(const OTableConnectionData& rSource) override;
+        virtual std::shared_ptr<OTableConnectionData> NewInstance() const override { return std::make_shared<ORelationTableConnectionData>(); }
+
+        /** Update create a new relation
+
+            @return true if successful
+        */
+        virtual bool Update() override;
+
+        void        SetCardinality();
+        void SetUpdateRules( sal_Int32 nAttr ){ m_nUpdateRules = nAttr; }
+        void SetDeleteRules( sal_Int32 nAttr ){ m_nDeleteRules = nAttr; }
+
+        sal_Int32    GetUpdateRules() const { return m_nUpdateRules; }
+        sal_Int32    GetDeleteRules() const { return m_nDeleteRules; }
+        Cardinality  GetCardinality() const { return m_nCardinality; }
+
+        void        IsConnectionPossible();
+        void        ChangeOrientation();
+        void        DropRelation();
+    };
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */