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selectquerybuilder.h
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/*
Copyright (c) 2007 Volker Krause <vkrause@kde.org>
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
This library is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
*/
#ifndef AKONADI_SELECTQUERYBUILDER_H
#define AKONADI_SELECTQUERYBUILDER_H
#include "storage/datastore.h"
#include "storage/querybuilder.h"
namespace Akonadi {
/**
Helper class for creating and executing database SELECT queries.
*/
template <typename T> class SelectQueryBuilder : public QueryBuilder
{
public:
/**
Creates a new query builder.
*/
inline SelectQueryBuilder() : QueryBuilder()
{
addTable( T::tableName() );
}
/**
Executes the query, returns true on success.
*/
inline bool exec()
{
QString statement = QLatin1String( "SELECT " );
statement += T::fullColumnNames().join( QLatin1String( ", " ) );
statement += QLatin1String(" FROM ");
statement += mTables.join( QLatin1String( ", " ) );
if ( !mConditions.isEmpty() ) {
statement += QLatin1String(" WHERE ");
int i = 0;
QStringList conds;
foreach ( const Condition c, mConditions ) {
QString cstmt = c.column;
cstmt += QLatin1Char( ' ' );
cstmt += c.op;
cstmt += QLatin1Char( ' ' );
if ( c.column2.isEmpty() ) {
if ( c.value.isValid() )
cstmt += QString::fromLatin1( ":%1" ).arg( i++ );
else
cstmt += QLatin1String( "NULL" );
} else {
cstmt += c.column2;
}
conds << cstmt;
}
statement += conds.join( QLatin1String( " AND " ) );
}
mQuery.prepare( statement );
int i = 0;
foreach ( const Condition c, mConditions )
if ( c.column2.isEmpty() && c.value.isValid() )
mQuery.bindValue( QString::fromLatin1( ":%1" ).arg( i++ ), c.value );
if ( !mQuery.exec() ) {
qDebug() << "Error during selecting records from table"
<< T::tableName() << mQuery.lastError().text();
qDebug() << "Query was:" << statement;
return false;
}
return true;
}
/**
Returns the result of this SELECT query.
*/
QList<T> result()
{
return T::extractResult( mQuery );
}
};
}
#endif

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