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Diffstat (limited to 'src/declarative/qml/qdeclarativesqldatabase.cpp')
| -rw-r--r-- | src/declarative/qml/qdeclarativesqldatabase.cpp | 428 |
1 files changed, 428 insertions, 0 deletions
diff --git a/src/declarative/qml/qdeclarativesqldatabase.cpp b/src/declarative/qml/qdeclarativesqldatabase.cpp new file mode 100644 index 0000000..855d623 --- /dev/null +++ b/src/declarative/qml/qdeclarativesqldatabase.cpp @@ -0,0 +1,428 @@ +/**************************************************************************** +** +** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtDeclarative module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qdeclarativesqldatabase_p.h" + +#include "qdeclarativeengine.h" +#include "qdeclarativeengine_p.h" +#include "qdeclarativerefcount_p.h" +#include "qdeclarativeengine_p.h" + +#include <QtCore/qobject.h> +#include <QtScript/qscriptvalue.h> +#include <QtScript/qscriptvalueiterator.h> +#include <QtScript/qscriptcontext.h> +#include <QtScript/qscriptengine.h> +#include <QtScript/qscriptclasspropertyiterator.h> +#include <QtSql/qsqldatabase.h> +#include <QtSql/qsqlquery.h> +#include <QtSql/qsqlerror.h> +#include <QtSql/qsqlrecord.h> +#include <QtCore/qstack.h> +#include <QtCore/qcryptographichash.h> +#include <QtCore/qsettings.h> +#include <QtCore/qdir.h> +#include <QtCore/qdebug.h> + +Q_DECLARE_METATYPE(QSqlDatabase) +Q_DECLARE_METATYPE(QSqlQuery) + +QT_BEGIN_NAMESPACE + +class QDeclarativeSqlQueryScriptClass: public QScriptClass { +public: + QDeclarativeSqlQueryScriptClass(QScriptEngine *engine) : QScriptClass(engine) + { + str_length = engine->toStringHandle(QLatin1String("length")); + str_forwardOnly = engine->toStringHandle(QLatin1String("forwardOnly")); // not in HTML5 (an optimization) + } + + QueryFlags queryProperty(const QScriptValue &, + const QScriptString &name, + QueryFlags flags, uint *) + { + if (flags & HandlesReadAccess) { + if (name == str_length) { + return HandlesReadAccess; + } else if (name == str_forwardOnly) { + return flags; + } + } + if (flags & HandlesWriteAccess) + if (name == str_forwardOnly) + return flags; + return 0; + } + + QScriptValue property(const QScriptValue &object, + const QScriptString &name, uint) + { + QSqlQuery query = qscriptvalue_cast<QSqlQuery>(object.data()); + if (name == str_length) { + int s = query.size(); + if (s<0) { + // Inefficient. + if (query.last()) { + return query.at()+1; + } else { + return 0; + } + } else { + return s; + } + } else if (name == str_forwardOnly) { + return query.isForwardOnly(); + } + return engine()->undefinedValue(); + } + + void setProperty(QScriptValue &object, + const QScriptString &name, uint, const QScriptValue & value) + { + if (name == str_forwardOnly) { + QSqlQuery query = qscriptvalue_cast<QSqlQuery>(object.data()); + query.setForwardOnly(value.toBool()); + } + } + + QScriptValue::PropertyFlags propertyFlags(const QScriptValue &/*object*/, const QScriptString &name, uint /*id*/) + { + if (name == str_length) { + return QScriptValue::Undeletable + | QScriptValue::SkipInEnumeration; + } + return QScriptValue::Undeletable; + } + +private: + QScriptString str_length; + QScriptString str_forwardOnly; +}; + +// If the spec changes to allow iteration, check git history... +// class QDeclarativeSqlQueryScriptClassPropertyIterator : public QScriptClassPropertyIterator + + + +enum SqlException { + UNKNOWN_ERR, + DATABASE_ERR, + VERSION_ERR, + TOO_LARGE_ERR, + QUOTA_ERR, + SYNTAX_ERR, + CONSTRAINT_ERR, + TIMEOUT_ERR +}; + +static const char* sqlerror[] = { + "UNKNOWN_ERR", + "DATABASE_ERR", + "VERSION_ERR", + "TOO_LARGE_ERR", + "QUOTA_ERR", + "SYNTAX_ERR", + "CONSTRAINT_ERR", + "TIMEOUT_ERR", + 0 +}; + +#define THROW_SQL(error, desc) \ +{ \ + QScriptValue errorValue = context->throwError(desc); \ + errorValue.setProperty(QLatin1String("code"), error); \ + return errorValue; \ +} + + +static QString databaseFile(const QString& connectionName, QScriptEngine *engine) +{ + QDeclarativeScriptEngine *qmlengine = static_cast<QDeclarativeScriptEngine*>(engine); + QString basename = qmlengine->offlineStoragePath + + QDir::separator() + QLatin1String("Databases") + QDir::separator(); + basename += connectionName; + return basename; +} + + + +static QScriptValue qmlsqldatabase_item(QScriptContext *context, QScriptEngine *engine) +{ + QSqlQuery query = qscriptvalue_cast<QSqlQuery>(context->thisObject().data()); + int i = context->argument(0).toNumber(); + if (query.at() == i || query.seek(i)) { // Qt 4.6 doesn't optimize seek(at()) + QSqlRecord r = query.record(); + QScriptValue row = engine->newObject(); + for (int j=0; j<r.count(); ++j) { + row.setProperty(r.fieldName(j), QScriptValue(engine,r.value(j).toString())); + } + return row; + } + return engine->undefinedValue(); +} + +static QScriptValue qmlsqldatabase_executeSql_outsidetransaction(QScriptContext *context, QScriptEngine * /*engine*/) +{ + THROW_SQL(DATABASE_ERR,QDeclarativeEngine::tr("executeSql called outside transaction()")); +} + +static QScriptValue qmlsqldatabase_executeSql(QScriptContext *context, QScriptEngine *engine) +{ + QSqlDatabase db = qscriptvalue_cast<QSqlDatabase>(context->thisObject()); + QString sql = context->argument(0).toString(); + QSqlQuery query(db); + bool err = false; + + QScriptValue result; + + if (query.prepare(sql)) { + if (context->argumentCount() > 1) { + QScriptValue values = context->argument(1); + if (values.isObject()) { + for (QScriptValueIterator it(values); it.hasNext();) { + it.next(); + query.bindValue(it.name(),it.value().toVariant()); + } + } else { + query.bindValue(0,values.toVariant()); + } + } + if (query.exec()) { + result = engine->newObject(); + QDeclarativeScriptEngine *qmlengine = static_cast<QDeclarativeScriptEngine*>(engine); + if (!qmlengine->sqlQueryClass) + qmlengine->sqlQueryClass = new QDeclarativeSqlQueryScriptClass(engine); + QScriptValue rows = engine->newObject(qmlengine->sqlQueryClass); + rows.setData(engine->newVariant(qVariantFromValue(query))); + rows.setProperty(QLatin1String("item"), engine->newFunction(qmlsqldatabase_item,1), QScriptValue::SkipInEnumeration); + result.setProperty(QLatin1String("rows"),rows); + result.setProperty(QLatin1String("rowsAffected"),query.numRowsAffected()); + result.setProperty(QLatin1String("insertId"),query.lastInsertId().toString()); + } else { + err = true; + } + } else { + err = true; + } + if (err) + THROW_SQL(DATABASE_ERR,query.lastError().text()); + return result; +} + +static QScriptValue qmlsqldatabase_executeSql_readonly(QScriptContext *context, QScriptEngine *engine) +{ + QString sql = context->argument(0).toString(); + if (sql.startsWith(QLatin1String("SELECT"),Qt::CaseInsensitive)) { + return qmlsqldatabase_executeSql(context,engine); + } else { + THROW_SQL(SYNTAX_ERR,QDeclarativeEngine::tr("Read-only Transaction")) + } +} + +static QScriptValue qmlsqldatabase_change_version(QScriptContext *context, QScriptEngine *engine) +{ + if (context->argumentCount() < 2) + return engine->undefinedValue(); + + QSqlDatabase db = qscriptvalue_cast<QSqlDatabase>(context->thisObject()); + QString from_version = context->argument(0).toString(); + QString to_version = context->argument(1).toString(); + QScriptValue callback = context->argument(2); + + QScriptValue instance = engine->newObject(); + instance.setProperty(QLatin1String("executeSql"), engine->newFunction(qmlsqldatabase_executeSql,1)); + QScriptValue tx = engine->newVariant(instance,qVariantFromValue(db)); + + QString foundvers = context->thisObject().property(QLatin1String("version")).toString(); + if (from_version!=foundvers) { + THROW_SQL(2,QDeclarativeEngine::tr("Version mismatch: expected %1, found %2").arg(from_version).arg(foundvers)); + return engine->undefinedValue(); + } + + bool ok = true; + if (callback.isFunction()) { + ok = false; + db.transaction(); + callback.call(QScriptValue(), QScriptValueList() << tx); + if (engine->hasUncaughtException()) { + db.rollback(); + } else { + if (!db.commit()) { + db.rollback(); + THROW_SQL(0,QDeclarativeEngine::tr("SQL transaction failed")); + } else { + ok = true; + } + } + } + + if (ok) { + context->thisObject().setProperty(QLatin1String("version"), to_version, QScriptValue::ReadOnly); + QSettings ini(databaseFile(db.connectionName(),engine)+QLatin1String(".ini"),QSettings::IniFormat); + ini.setValue(QLatin1String("Version"), to_version); + } + + return engine->undefinedValue(); +} + +static QScriptValue qmlsqldatabase_transaction_shared(QScriptContext *context, QScriptEngine *engine, bool readOnly) +{ + QSqlDatabase db = qscriptvalue_cast<QSqlDatabase>(context->thisObject()); + QScriptValue callback = context->argument(0); + if (!callback.isFunction()) + THROW_SQL(UNKNOWN_ERR,QDeclarativeEngine::tr("transaction: missing callback")); + + QScriptValue instance = engine->newObject(); + instance.setProperty(QLatin1String("executeSql"), + engine->newFunction(readOnly ? qmlsqldatabase_executeSql_readonly : qmlsqldatabase_executeSql,1)); + QScriptValue tx = engine->newVariant(instance,qVariantFromValue(db)); + + db.transaction(); + callback.call(QScriptValue(), QScriptValueList() << tx); + instance.setProperty(QLatin1String("executeSql"), + engine->newFunction(qmlsqldatabase_executeSql_outsidetransaction)); + if (engine->hasUncaughtException()) { + db.rollback(); + } else { + if (!db.commit()) + db.rollback(); + } + return engine->undefinedValue(); +} + +static QScriptValue qmlsqldatabase_transaction(QScriptContext *context, QScriptEngine *engine) +{ + return qmlsqldatabase_transaction_shared(context,engine,false); +} +static QScriptValue qmlsqldatabase_read_transaction(QScriptContext *context, QScriptEngine *engine) +{ + return qmlsqldatabase_transaction_shared(context,engine,true); +} + +/* + Currently documented in doc/src/declarastive/globalobject.qdoc +*/ +static QScriptValue qmlsqldatabase_open_sync(QScriptContext *context, QScriptEngine *engine) +{ + QSqlDatabase database; + + QString dbname = context->argument(0).toString(); + QString dbversion = context->argument(1).toString(); + QString dbdescription = context->argument(2).toString(); + int dbestimatedsize = context->argument(3).toNumber(); + QScriptValue dbcreationCallback = context->argument(4); + + QCryptographicHash md5(QCryptographicHash::Md5); + md5.addData(dbname.toUtf8()); + QString dbid(QLatin1String(md5.result().toHex())); + + QString basename = databaseFile(dbid,engine); + bool created = false; + QString version = dbversion; + + { + QSettings ini(basename+QLatin1String(".ini"),QSettings::IniFormat); + + if (QSqlDatabase::connectionNames().contains(dbid)) { + database = QSqlDatabase::database(dbid); + version = ini.value(QLatin1String("Version")).toString(); + if (version != dbversion && !dbversion.isEmpty() && !version.isEmpty()) + THROW_SQL(VERSION_ERR,QDeclarativeEngine::tr("SQL: database version mismatch")); + } else { + created = !QFile::exists(basename+QLatin1String(".sqlite")); + database = QSqlDatabase::addDatabase(QLatin1String("QSQLITE"), dbid); + QDir().mkpath(basename); + if (created) { + ini.setValue(QLatin1String("Name"), dbname); + if (dbcreationCallback.isFunction()) + version = QString(); + ini.setValue(QLatin1String("Version"), version); + ini.setValue(QLatin1String("Description"), dbdescription); + ini.setValue(QLatin1String("EstimatedSize"), dbestimatedsize); + ini.setValue(QLatin1String("Driver"), QLatin1String("QSQLITE")); + } else { + if (!dbversion.isEmpty() && ini.value(QLatin1String("Version")) != dbversion) { + // Incompatible + THROW_SQL(VERSION_ERR,QDeclarativeEngine::tr("SQL: database version mismatch")); + } + version = ini.value(QLatin1String("Version")).toString(); + } + database.setDatabaseName(basename+QLatin1String(".sqlite")); + } + if (!database.isOpen()) + database.open(); + } + + QScriptValue instance = engine->newObject(); + instance.setProperty(QLatin1String("transaction"), engine->newFunction(qmlsqldatabase_transaction,1)); + instance.setProperty(QLatin1String("readTransaction"), engine->newFunction(qmlsqldatabase_read_transaction,1)); + instance.setProperty(QLatin1String("version"), version, QScriptValue::ReadOnly); + instance.setProperty(QLatin1String("changeVersion"), engine->newFunction(qmlsqldatabase_change_version,3)); + + QScriptValue result = engine->newVariant(instance,qVariantFromValue(database)); + + if (created && dbcreationCallback.isFunction()) { + dbcreationCallback.call(QScriptValue(), QScriptValueList() << result); + } + + return result; +} + +void qt_add_qmlsqldatabase(QScriptEngine *engine) +{ + QScriptValue openDatabase = engine->newFunction(qmlsqldatabase_open_sync, 4); + engine->globalObject().setProperty(QLatin1String("openDatabaseSync"), openDatabase); + + QScriptValue sqlExceptionPrototype = engine->newObject(); + for (int i=0; sqlerror[i]; ++i) + sqlExceptionPrototype.setProperty(QLatin1String(sqlerror[i]), + i,QScriptValue::ReadOnly | QScriptValue::Undeletable | QScriptValue::SkipInEnumeration); + + engine->globalObject().setProperty(QLatin1String("SQLException"), sqlExceptionPrototype); +} + +/* +HTML5 "spec" says "rs.rows[n]", but WebKit only impelments "rs.rows.item(n)". We do both (and property iterator). +We add a "forwardOnly" property that stops Qt caching results (code promises to only go forward +through the data. +*/ + +QT_END_NAMESPACE |