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/* This file is part of the KDE project
Copyright (C) 2003-2004 Jaroslaw Staniek <js@iidea.pl>
This program 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 program 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 program; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <kexidb/relationship.h>
#include <kexidb/indexschema.h>
#include <kexidb/tableschema.h>
#include <kexidb/queryschema.h>
#include <kexidb/driver.h>
#include <kdebug.h>
using namespace KexiDB;
Relationship::Relationship()
: m_masterIndex(0)
, m_detailsIndex(0)
, m_masterIndexOwned(false)
, m_detailsIndexOwned(false)
{
m_pairs.setAutoDelete(true);
}
Relationship::Relationship(IndexSchema* masterIndex, IndexSchema* detailsIndex)
: m_masterIndex(0)
, m_detailsIndex(0)
, m_masterIndexOwned(false)
, m_detailsIndexOwned(false)
{
m_pairs.setAutoDelete(true);
setIndices(masterIndex, detailsIndex);
}
Relationship::Relationship( QuerySchema *query, Field *field1, Field *field2 )
: m_masterIndex(0)
, m_detailsIndex(0)
, m_masterIndexOwned(false)
, m_detailsIndexOwned(false)
{
m_pairs.setAutoDelete(true);
createIndices( query, field1, field2 );
}
Relationship::~Relationship()
{
if (m_masterIndexOwned)
delete m_masterIndex;
if (m_detailsIndexOwned)
delete m_detailsIndex;
}
void Relationship::createIndices( QuerySchema *query, Field *field1, Field *field2 )
{
if (!field1 || !field2 || !query) {
KexiDBWarn << "Relationship::addRelationship(): !masterField || !detailsField || !query" << endl;
return;
}
if (field1->isQueryAsterisk() || field2->isQueryAsterisk()) {
KexiDBWarn << "Relationship::addRelationship(): relationship's fields cannot be asterisks" << endl;
return;
}
if (field1->table() == field2->table()) {
KexiDBWarn << "Relationship::addRelationship(): fields cannot belong to the same table" << endl;
return;
}
// if (!query->hasField(field1) && !query->hasField(field2)) {
if (!query->contains(field1->table()) || !query->contains(field2->table())) {
KexiDBWarn << "Relationship::addRelationship(): fields do not belong to this query" << endl;
return;
}
//@todo: check more things: -types
//@todo: find existing global db relationships
Field *masterField = 0, *detailsField = 0;
bool p1 = field1->isPrimaryKey(), p2 = field2->isPrimaryKey();
if (p1 && p2) {
//2 primary keys
masterField = field1;
m_masterIndex = masterField->table()->primaryKey();
detailsField = field2;
m_detailsIndex = detailsField->table()->primaryKey();
}
else if (!p1 && p2) {
//foreign + primary: swap
Field *tmp = field1;
field1 = field2;
field2 = tmp;
p1 = !p1;
p2 = !p2;
}
if (p1 && !p2) {
//primary + foreign
masterField = field1;
m_masterIndex = masterField->table()->primaryKey();
detailsField = field2;
//create foreign key
//@todo: check if it already exists
m_detailsIndex = new IndexSchema(detailsField->table());
m_detailsIndexOwned = true;
m_detailsIndex->addField(detailsField);
m_detailsIndex->setForeignKey(true);
}
else if (!p1 && !p2) {
masterField = field1;
m_masterIndex = new IndexSchema(masterField->table());
m_masterIndexOwned = true;
m_masterIndex->addField(masterField);
m_masterIndex->setForeignKey(true);
detailsField = field2;
m_detailsIndex = new IndexSchema(detailsField->table());
m_detailsIndexOwned = true;
m_detailsIndex->addField(detailsField);
m_detailsIndex->setForeignKey(true);
}
if (!m_masterIndex || !m_detailsIndex)
return; //failed
setIndices(m_masterIndex, m_detailsIndex, false);
}
TableSchema* Relationship::masterTable() const
{
return m_masterIndex ? m_masterIndex->table() : 0;
}
TableSchema* Relationship::detailsTable() const
{
return m_detailsIndex ? m_detailsIndex->table() : 0;
}
void Relationship::setIndices(IndexSchema* masterIndex, IndexSchema* detailsIndex)
{
setIndices(masterIndex, detailsIndex, true);
}
void Relationship::setIndices(IndexSchema* masterIndex, IndexSchema* detailsIndex, bool ownedByMaster)
{
m_masterIndex = 0;
m_detailsIndex = 0;
m_pairs.clear();
if (!masterIndex || !detailsIndex || !masterIndex->table() || !detailsIndex->table()
|| masterIndex->table()==detailsIndex->table() || masterIndex->fieldCount()!=detailsIndex->fieldCount())
return;
Field::ListIterator it1(*masterIndex->fields());
Field::ListIterator it2(*detailsIndex->fields());
for (;it1.current() && it1.current(); ++it1, ++it2) {
Field *f1 = it1.current(); //masterIndex->fields()->first();
Field *f2 = it2.current(); //detailsIndex->fields()->first();
// while (f1 && f2) {
if (f1->type()!=f1->type() && f1->isIntegerType()!=f2->isIntegerType() && f1->isTextType()!=f2->isTextType()) {
KexiDBWarn << "Relationship::setIndices(INDEX on '"<<masterIndex->table()->name()
<<"',INDEX on "<<detailsIndex->table()->name()<<"): !equal field types: "
<<Driver::defaultSQLTypeName(f1->type())<<" "<<f1->name()<<", "
<<Driver::defaultSQLTypeName(f2->type())<<" "<<f2->name() <<endl;
m_pairs.clear();
return;
}
#if 0 //too STRICT!
if ((f1->isUnsigned() && !f2->isUnsigned()) || (!f1->isUnsigned() && f1->isUnsigned())) {
KexiDBWarn << "Relationship::setIndices(INDEX on '"<<masterIndex->table()->name()
<<"',INDEX on "<<detailsIndex->table()->name()<<"): !equal signedness of field types: "
<<Driver::defaultSQLTypeName(f1->type())<<" "<<f1->name()<<", "
<<Driver::defaultSQLTypeName(f2->type())<<" "<<f2->name() <<endl;
m_pairs.clear();
return;
}
#endif
m_pairs.append( new Field::Pair(f1,f2) );
}
//ok: update information
if (m_masterIndex) {//detach yourself
m_masterIndex->detachRelationship(this);
}
if (m_detailsIndex) {//detach yourself
m_detailsIndex->detachRelationship(this);
}
m_masterIndex = masterIndex;
m_detailsIndex = detailsIndex;
m_masterIndex->attachRelationship(this, ownedByMaster);
m_detailsIndex->attachRelationship(this, ownedByMaster);
}
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