summaryrefslogtreecommitdiff
path: root/connectivity/source/drivers/hsqldb/HView.cxx
blob: 810acdf08561d9409ee8df15a7dff12085938655 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
/* -*- 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 .
 */


#include <hsqldb/HView.hxx>
#include <hsqldb/HTools.hxx>

#include <propertyids.hxx>

#include <connectivity/dbexception.hxx>
#include <connectivity/dbtools.hxx>

#include <com/sun/star/lang/WrappedTargetException.hpp>
#include <com/sun/star/lang/DisposedException.hpp>
#include <com/sun/star/sdbc/XRow.hpp>
#include <com/sun/star/sdbc/SQLException.hpp>

#include <cppuhelper/exc_hlp.hxx>
#include <tools/diagnose_ex.h>
#include <unotools/sharedunocomponent.hxx>


namespace connectivity { namespace hsqldb
{


    using ::com::sun::star::uno::Reference;
    using ::com::sun::star::uno::UNO_QUERY_THROW;
    using ::com::sun::star::uno::Exception;
    using ::com::sun::star::uno::RuntimeException;
    using ::com::sun::star::uno::Any;
    using ::com::sun::star::sdbc::SQLException;
    using ::com::sun::star::sdbc::XConnection;
    using ::com::sun::star::lang::WrappedTargetException;
    using ::com::sun::star::sdbc::XResultSet;
    using ::com::sun::star::sdbc::XStatement;
    using ::com::sun::star::lang::DisposedException;
    using ::com::sun::star::sdbc::XRow;

    HView::HView( const Reference< XConnection >& _rxConnection, bool _bCaseSensitive,
        const OUString& _rSchemaName, const OUString& _rName )
        :HView_Base( _bCaseSensitive, _rName, _rxConnection->getMetaData(), OUString(), _rSchemaName, OUString() )
        ,m_xConnection( _rxConnection )
    {
    }


    HView::~HView()
    {
    }


    IMPLEMENT_FORWARD_XINTERFACE2( HView, HView_Base, HView_IBASE )
    IMPLEMENT_FORWARD_XTYPEPROVIDER2( HView, HView_Base, HView_IBASE )


    void SAL_CALL HView::alterCommand( const OUString& _rNewCommand )
    {
        // not really atomic ... as long as we do not have something like
        //   ALTER VIEW <name> TO <command>
        // in HSQL, we need to do it this way ...
        //
        // I can imagine scenarios where this fails, e.g. when dropping the view
        // succeeds, re-creating it fails, some other thread alters a table which
        // the view was based on, and then we try to restore the view with the
        // original command, which then fails, too.
        //
        // However, there's not much chance to prevent this kind of errors without
        // backend support.

        OUString sQualifiedName( ::dbtools::composeTableName(
            m_xMetaData, m_CatalogName, m_SchemaName, m_Name, true, ::dbtools::EComposeRule::InDataManipulation ) );

        ::utl::SharedUNOComponent< XStatement > xStatement; xStatement.set( m_xConnection->createStatement(), UNO_QUERY_THROW );

        // create a statement which can be used to re-create the original view, in case
        // dropping it succeeds, but creating it with a new statement fails
        OUStringBuffer aRestoreCommand;
        aRestoreCommand.append( "CREATE VIEW " );
        aRestoreCommand.append     ( sQualifiedName );
        aRestoreCommand.append( " AS " );
        aRestoreCommand.append     ( impl_getCommand_throwSQLException() );
        OUString sRestoreCommand( aRestoreCommand.makeStringAndClear() );

        bool bDropSucceeded( false );
        try
        {
            // drop the existing view
            OUStringBuffer aCommand;
            aCommand.append( "DROP VIEW " );
            aCommand.append     ( sQualifiedName );
            xStatement->execute( aCommand.makeStringAndClear() );
            bDropSucceeded = true;

            // create a new one with the same name
            aCommand.append( "CREATE VIEW " );
            aCommand.append     ( sQualifiedName );
            aCommand.append( " AS " );
            aCommand.append     ( _rNewCommand );
            xStatement->execute( aCommand.makeStringAndClear() );
        }
        catch( const SQLException& )
        {
            if ( bDropSucceeded )
                // drop succeeded, but creation failed -> re-create the view with the original
                // statement
                xStatement->execute( sRestoreCommand );
            throw;
        }
        catch( const RuntimeException& )
        {
            if ( bDropSucceeded )
                xStatement->execute( sRestoreCommand );
            throw;
        }
        catch( const Exception& )
        {
            DBG_UNHANDLED_EXCEPTION("connectivity.hsqldb");
            if ( bDropSucceeded )
                xStatement->execute( sRestoreCommand );
        }
    }


    void SAL_CALL HView::getFastPropertyValue( Any& _rValue, sal_Int32 _nHandle ) const
    {
        if ( _nHandle == PROPERTY_ID_COMMAND )
        {
            // retrieve the very current command, don't rely on the base classes cached value
            // (which we initialized empty, anyway)
            _rValue <<= impl_getCommand_wrapSQLException();
            return;
        }

        HView_Base::getFastPropertyValue( _rValue, _nHandle );
    }

    OUString HView::impl_getCommand() const
    {
        OUStringBuffer aCommand;
        aCommand.append( "SELECT VIEW_DEFINITION FROM INFORMATION_SCHEMA.SYSTEM_VIEWS " );
        HTools::appendTableFilterCrit( aCommand, m_CatalogName, m_SchemaName, m_Name, false );
        ::utl::SharedUNOComponent< XStatement > xStatement; xStatement.set( m_xConnection->createStatement(), UNO_QUERY_THROW );
        Reference< XResultSet > xResult( xStatement->executeQuery( aCommand.makeStringAndClear() ), css::uno::UNO_SET_THROW );
        if ( !xResult->next() )
        {
            // hmm. There is no view the name as we know it. Can only mean some other instance
            // dropped this view meanwhile...
            throw DisposedException();
        }

        Reference< XRow > xRow( xResult, UNO_QUERY_THROW );
        return xRow->getString( 1 );
    }

    OUString HView::impl_getCommand_wrapSQLException() const
    {
        OUString sCommand;

        try
        {
            sCommand = impl_getCommand();
        }
        catch( const RuntimeException& )
        {
            throw;
        }
        catch( const SQLException& e )
        {
            throw WrappedTargetException( e.Message, static_cast< XAlterView* >( const_cast< HView* >( this ) ), ::cppu::getCaughtException() );
        }
        catch( const Exception& )
        {
            DBG_UNHANDLED_EXCEPTION("connectivity.hsqldb");
        }

        return sCommand;
    }

    OUString HView::impl_getCommand_throwSQLException() const
    {
        OUString sCommand;

        try
        {
            sCommand = impl_getCommand();
        }
        catch( const RuntimeException& )
        {
            throw;
        }
        catch( const SQLException& )
        {
            throw;
        }
        catch( const Exception& )
        {
            DBG_UNHANDLED_EXCEPTION("connectivity.hsqldb");
        }

        return sCommand;
    }

} } // namespace connectivity::hsqldb


/* vim:set shiftwidth=4 softtabstop=4 expandtab: */