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137 lines
4.7 KiB
137 lines
4.7 KiB
/* This file is part of the KDE project
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Copyright (C) 2003, 2006 Jaroslaw Staniek <js@iidea.pl>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef KEXIDB_ROWEDITBUFFER_H
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#define KEXIDB_ROWEDITBUFFER_H
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#include <tqmap.h>
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#include <kexidb/field.h>
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#include <kexidb/queryschema.h>
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namespace KexiDB {
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/*! @short provides data for single edited database row
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KexiDB::RowEditBuffer provides data for single edited row,
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needed to perform update at the database backend.
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Its advantage over pasing e.g. KexiDB::FieldList object is that
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EditBuffer contains only changed values.
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EditBuffer offers two modes: db-aware and not-db-aware.
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Db-aware buffer addresses a field using references to QueryColumnInfo object,
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while not-db-aware buffer addresses a field using its name.
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Example usage of not-db-aware buffer:
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<code>
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QuerySchema *query = .....
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EditBuffer buf;
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buf.insert("name", "Joe");
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buf.insert("surname", "Black");
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buf.at("name"); //returns "Joe"
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buf.at("surname"); //returns "Black"
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buf.at(query->field("surname")); //returns "Black" too
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// Now you can use buf to add or edit records using
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// KexiDB::Connection::updateRow(), KexiDB::Connection::insertRow()
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</code>
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Example usage of db-aware buffer:
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<code>
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QuerySchema *query = .....
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QueryColumnInfo *ci1 = ....... //e.g. can be obtained from QueryScehma::fieldsExpanded()
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QueryColumnInfo *ci2 = .......
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EditBuffer buf;
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buf.insert(*ci1, "Joe");
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buf.insert(*ci2, "Black");
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buf.at(*ci1); //returns "Joe"
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buf.at(*ci2); //returns "Black"
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// Now you can use buf to add or edit records using
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// KexiDB::Connection::updateRow(), KexiDB::Connection::insertRow()
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</code>
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You can use TQMap::clear() to clear buffer contents,
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TQMap::isEmpty() to see if buffer is empty.
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For more, see TQMap documentation.
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Notes: added fields should come from the same (common) QuerySchema object.
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However, this isn't checked at TQValue& EditBuffer::operator[]( const Field& f ) level.
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*/
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class KEXI_DB_EXPORT RowEditBuffer {
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public:
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typedef TQMap<TQString,TQVariant> SimpleMap;
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typedef TQMap<QueryColumnInfo*,TQVariant> DBMap;
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RowEditBuffer(bool dbAwareBuffer);
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~RowEditBuffer();
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inline bool isDBAware() const { return m_dbBuffer!=0; }
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void clear();
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bool isEmpty() const;
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//! Inserts value \a val for db-aware buffer's column \a ci
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inline void insert( QueryColumnInfo& ci, TQVariant &val ) {
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if (m_dbBuffer) {
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m_dbBuffer->insert(&ci, val);
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m_defaultValuesDbBuffer->remove(&ci);
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}
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}
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//! Inserts value \a val for not-db-aware buffer's column \a fname
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inline void insert( const TQString& fname, TQVariant &val )
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{ if (m_simpleBuffer) m_simpleBuffer->insert(fname,val); }
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/*! Useful only for db-aware buffer. \return value for column \a ci
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If there is no value assigned for the buffer, this method tries to remember and return
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default value obtained from \a ci if \a useDefaultValueIfPossible is true.
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Note that if the column is declared as unique (especially: primary key),
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default value will not be used. */
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const TQVariant* at( QueryColumnInfo& ci, bool useDefaultValueIfPossible = true ) const;
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//! Useful only for not-db-aware buffer. \return value for field \a f
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const TQVariant* at( Field& f ) const;
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//! Useful only for not-db-aware buffer. \return value for field \a fname
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const TQVariant* at( const TQString& fname ) const;
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//! Useful only for db-aware buffer: \return true if the value available as
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//! at( ci ) is obtained from column's default value
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inline bool hasDefaultValueAt( QueryColumnInfo& ci ) const {
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return m_defaultValuesDbBuffer->contains(&ci) && (*m_defaultValuesDbBuffer)[ &ci ];
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}
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inline const SimpleMap simpleBuffer() { return *m_simpleBuffer; }
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inline const DBMap dbBuffer() { return *m_dbBuffer; }
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//! For debugging purposes
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void debug();
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protected:
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SimpleMap *m_simpleBuffer;
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SimpleMap::ConstIterator *m_simpleBufferIt;
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DBMap *m_dbBuffer;
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DBMap::Iterator *m_dbBufferIt;
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TQMap<QueryColumnInfo*,bool> *m_defaultValuesDbBuffer;
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TQMap<QueryColumnInfo*,bool>::ConstIterator *m_defaultValuesDbBufferIt;
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};
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} //namespace KexiDB
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#endif
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