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115 lines
4.5 KiB
115 lines
4.5 KiB
/* This file is part of the KDE project
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Copyright (C) 2006 Jaroslaw Staniek <js@iidea.pl>
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This program 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 program 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 program; see the file COPYING. 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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// ** bits of SQLiteConnection related to table altering **
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#include "sqliteconnection.h"
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#include <kexidb/utils.h>
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#include <kstaticdeleter.h>
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#include <tqmap.h>
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using namespace KexiDB;
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enum SQLiteTypeAffinity { //as defined here: 2.1 Determination Of Column Affinity (http://sqlite.org/datatype3.html)
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NoAffinity = 0, IntAffinity = 1, TextAffinity = 2, BLOBAffinity = 3
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};
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//! helper for affinityForType()
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static KStaticDeleter< TQMap<int,int> > KexiDB_SQLite_affinityForType_deleter;
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TQMap<int,int> *KexiDB_SQLite_affinityForType = 0;
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//! \return SQLite type affinity for \a type
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//! See doc/dev/alter_table_type_conversions.ods, page 2 for more info
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static SQLiteTypeAffinity affinityForType(Field::Type type)
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{
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if (!KexiDB_SQLite_affinityForType) {
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KexiDB_SQLite_affinityForType_deleter.setObject( KexiDB_SQLite_affinityForType, new TQMap<int,int>() );
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KexiDB_SQLite_affinityForType->insert(Field::Byte, IntAffinity);
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KexiDB_SQLite_affinityForType->insert(Field::ShortInteger, IntAffinity);
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KexiDB_SQLite_affinityForType->insert(Field::Integer, IntAffinity);
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KexiDB_SQLite_affinityForType->insert(Field::BigInteger, IntAffinity);
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KexiDB_SQLite_affinityForType->insert(Field::Boolean, IntAffinity);
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KexiDB_SQLite_affinityForType->insert(Field::Date, TextAffinity);
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KexiDB_SQLite_affinityForType->insert(Field::DateTime, TextAffinity);
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KexiDB_SQLite_affinityForType->insert(Field::Time, TextAffinity);
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KexiDB_SQLite_affinityForType->insert(Field::Float, IntAffinity);
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KexiDB_SQLite_affinityForType->insert(Field::Double, IntAffinity);
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KexiDB_SQLite_affinityForType->insert(Field::Text, TextAffinity);
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KexiDB_SQLite_affinityForType->insert(Field::LongText, TextAffinity);
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KexiDB_SQLite_affinityForType->insert(Field::BLOB, BLOBAffinity);
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}
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return static_cast<SQLiteTypeAffinity>((*KexiDB_SQLite_affinityForType)[(int)type]);
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}
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tristate SQLiteConnection::drv_changeFieldProperty(TableSchema &table, Field& field,
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const TQString& propertyName, const TQVariant& value)
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{
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/* if (propertyName=="name") {
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}*/
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if (propertyName=="type") {
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bool ok;
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Field::Type type = KexiDB::intToFieldType( value.toUInt(&ok) );
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if (!ok || Field::InvalidType == type) {
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//! @todo msg
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return false;
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}
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return changeFieldType(table, field, type);
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}
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// not found
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return cancelled;
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}
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/*!
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From http://sqlite.org/datatype3.html :
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Version 3 enhances provides the ability to store integer and real numbers in a more compact
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format and the capability to store BLOB data.
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Each value stored in an SQLite database (or manipulated by the database engine) has one
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of the following storage classes:
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* NULL. The value is a NULL value.
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* INTEGER. The value is a signed integer, stored in 1, 2, 3, 4, 6, or 8 bytes depending
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on the magnitude of the value.
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* REAL. The value is a floating point value, stored as an 8-byte IEEE floating point number.
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* TEXT. The value is a text string, stored using the database encoding (UTF-8, UTF-16BE or UTF-16-LE).
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* BLOB. The value is a blob of data, stored exactly as it was input.
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Column Affinity
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In SQLite version 3, the type of a value is associated with the value itself,
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not with the column or variable in which the value is stored.
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.The type affinity of a column is the recommended type for data stored in that column.
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See alter_table_type_conversions.ods for details.
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*/
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tristate SQLiteConnection::changeFieldType(TableSchema &table, Field& field,
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Field::Type type)
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{
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Q_UNUSED(table);
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const Field::Type oldType = field.type();
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const SQLiteTypeAffinity oldAffinity = affinityForType(oldType);
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const SQLiteTypeAffinity newAffinity = affinityForType(type);
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if (oldAffinity!=newAffinity) {
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//type affinity will be changed
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}
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return cancelled;
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}
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