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我是黑莓手機新手，並且遇到了SQL連接問題：當我嘗試在db上執行查詢時，我有和C++中的錯誤，但是當我使用來自QML的方法就像魅力一樣。db沒有連接或更新
so the thing is here:
/* Copyright (c) 2012 Research In Motion Limited.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "customsqldatasource.h"
int const CustomSqlDataSource::LOAD_EXECUTION = 0;
CustomSqlDataSource::CustomSqlDataSource(QObject *parent) :
QObject(parent)
{
}
CustomSqlDataSource::~CustomSqlDataSource()
{
delete mSqlConnector;
}
void CustomSqlDataSource::copyFileToDataFolder(const QString fileName)
{
// Since we need read and write access to the file, it has
// to be moved to a folder where we have access to it. First,
// we check if the file already exists (previously copied).
QString dataFolder = QDir::homePath();
QString newFileName = dataFolder + "/" + fileName;
QFile newFile(newFileName);
if (!newFile.exists()) {
// If the file is not already in the data folder, we copy it from the
// assets folder (read only) to the data folder (read and write).
QString appFolder(QDir::homePath());
appFolder.chop(4);
QString originalFileName = appFolder + "app/native/assets/" + fileName;
QFile originalFile(originalFileName);
if (originalFile.exists()) {
// Create sub folders if any creates the SQL folder for a file path like e.g. sql/quotesdb
QFileInfo fileInfo(newFileName);
QDir().mkpath (fileInfo.dir().path());
if(!originalFile.copy(newFileName)) {
qDebug() << "Failed to copy file to path: " << newFileName;
}
} else {
qDebug() << "Failed to copy file data base file does not exists.";
}
}
mSourceInDataFolder = newFileName;
}
void CustomSqlDataSource::setSource(const QString source)
{
if (mSource.compare(source) != 0) {
// Copy the file to the data folder to get read and write access.
copyFileToDataFolder(source);
mSource = source;
emit sourceChanged(mSource);
}
}
QString CustomSqlDataSource::source()
{
return mSource;
}
void CustomSqlDataSource::setQuery(const QString query)
{
if (mQuery.compare(query) != 0) {
mQuery = query;
emit queryChanged(mQuery);
}
}
QString CustomSqlDataSource::query()
{
return mQuery;
}
bool CustomSqlDataSource::checkConnection()
{
if (mSqlConnector) {
return true;
} else {
QFile newFile(mSourceInDataFolder);
if (newFile.exists()) {
// Remove the old connection if it exists
if(mSqlConnector){
disconnect(mSqlConnector, SIGNAL(reply(const bb::data::DataAccessReply&)), this,
SLOT(onLoadAsyncResultData(const bb::data::DataAccessReply&)));
delete mSqlConnector;
}
// Set up a connection to the data base
mSqlConnector = new SqlConnection(mSourceInDataFolder, "connect");
// Connect to the reply function
connect(mSqlConnector, SIGNAL(reply(const bb::data::DataAccessReply&)), this,
SLOT(onLoadAsyncResultData(const bb::data::DataAccessReply&)));
return true;
} else {
qDebug() << "CustomSqlDataSource::checkConnection Failed to load data base, file does not exist.";
}
}
return false;
}
void CustomSqlDataSource::execute (const QString& query, const QVariantMap &valuesByName, int id)
{
if (checkConnection()) {
mSqlConnector->execute(query, valuesByName, id);
}
}
void CustomSqlDataSource::load()
{
if (mQuery.isEmpty() == false) {
if (checkConnection()) {
mSqlConnector->execute(mQuery, LOAD_EXECUTION);
}
}
}
void CustomSqlDataSource::onLoadAsyncResultData(const bb::data::DataAccessReply& replyData)
{
if (replyData.hasError()) {
qWarning() << "onLoadAsyncResultData: " << replyData.id() << ", SQL error: " << replyData;
} else {
if(replyData.id() == LOAD_EXECUTION) {
// The reply belongs to the execution of the query property of the data source
// Emit the the data loaded signal so that the model can be populated.
QVariantList resultList = replyData.result().value<QVariantList>();
emit dataLoaded(resultList);
} else {
// Forward the reply signal.
emit reply(replyData);
}
}
}
這是我用作接口連接到sql的cpp文件。
這裏是我是從C++
....
string sqlVersion = "update version set VERSION = " + ver;
CustomSqlDataSource dataToLoad;
dataToLoad.setQuery(sqlVersion.c_str());
dataToLoad.load();
....
這將產生錯誤
[email protected]_ZN2bb4data15AsyncDataAccess7executeERK8QVarianti+0x5）mapaddr = 0001d2ba調用SQL。 REF = 00000035
，但奇怪的是，當我從SQL消耗它，它完美的作品偉大的，我消耗它雜色山雀qmls例如：
import bb.cascades 1.0
import com.lbc.data 1.0
import "customField"
Page {
property string dropDownValue: "2"
property string webViewText
attachedObjects: [
GroupDataModel {
id: dataValueModel
grouping: ItemGrouping.None
},
CustomSqlDataSource {
id: asynkDataSource
source: "sql/LBCData.db"
query: "SELECT * FROM INFORMACION ORDER BY Id"
property int loadCounter: 0
onDataLoaded: {
if (data.length > 0) {
dataValueModel.insertList(data);
var fetchColumData = dataValueModel.data([ dropDownValue ])
webViewText = fetchColumData.contenido
console.log(webViewText);
}
}
}
]
onCreationCompleted: {
asynkDataSource.load();
}
Container {
CustomHeader {
text: "Tipo de Seguro:"
}
DropDown {
id: dropdownVal
horizontalAlignment: HorizontalAlignment.Center
preferredWidth: 550
Option {
value: "1"
text: "SEGUROS GENERALES"
}
Option {
value: "2"
text: "SEGUROS AUTOMOTORES"
selected: true
}
Option {
value: "5"
text: "SEGUROS PERSONALES"
}
onSelectedValueChanged: {
console.log("Value..." + dropdownVal.selectedOption.value);
dropDownValue = dropdownVal.selectedOption.value;
asynkDataSource.load();
}
}
ScrollView {
id: scrollView
scrollViewProperties {
scrollMode: ScrollMode.Vertical
}
WebView {
id : webView
html: webViewText
settings.defaultFontSize: 42
settings.minimumFontSize: 16
}
}
}
}
如果任何人有它可真是異想天開，請讓我知道，這是我第一次和bb10一起，也是第一次。
編輯1： I'va增加了行來設置查詢，但產生的CopyFile錯誤，看來這個錯誤是文件
dataToLoad.setSource("lbc/LBCData.db");
Failed to copy file data base file does not exists.
Process 43913393 (LaBolivianaCiacruz) terminated SIGSEGV code=1 fltno=11 ip=fffffb34
編輯2：現在，我使用下面的代碼，這段代碼基於官方紀錄片，不同之處在於我不是爲file.open開發的，因爲它被標記爲類型文件的非有效函數。控制檯給出了hasError的no錯誤消息，但在崩潰之後，我檢查了它，並且執行了sql語句，並且狀態良好，但是無論如何應用程序崩潰了。它給回以下錯誤：
過程115667153（LaBolivianaCiacruz）終止SIGSEGV代碼= 1 fltno = 11 IP = 0805f27a（/accounts/1000/appdata/com.lbc.movilexpres.testDev_movilexpreseb26522c/app/native/[email protected]_ZNSs6appendERKSsjj + 0x4e5）REF = 8b0020a9
QDir home = QDir::home();
copyfiletoDir("sql/LBCData.db");
bb::data::SqlDataAccess sda(home.absoluteFilePath("sql/LBCData.db"));
// QFile file(home.absoluteFilePath("sql/LBCData.db"));
// if(file.open());
sda.execute(sqlVersion.c_str());
if(sda.hasError()){
DataAccessError theError = sda.error();
if (theError.errorType() == DataAccessErrorType::SourceNotFound)
qDebug() << "Source not found: " + theError.errorMessage();
else if (theError.errorType() == DataAccessErrorType::ConnectionFailure)
qDebug() << "Connection failure: " + theError.errorMessage();
else if (theError.errorType() == DataAccessErrorType::OperationFailure)
qDebug() << "Operation failure: " + theError.errorMessage();
} else {
qDebug() << "No error.";
}
我還沒看着它那麼久，但不是你querry：），你必須使用一個parameterized SQL命令「更新版本集版本=」 +版本 – Richard
不要」我認爲是這樣，我在Android和iOS應用上使用了相同的查詢，現在我正在爲bb10開發並且完美地工作，同時我也對查詢進行了評論，之後那些來自web服務並且同樣崩潰的查詢，以及他們正在工作，因爲他們來自Android和iOS平臺從 –
我不能真正幫助你深入，但如果你知道它的工作方式''但奇怪的是，當我從SQL使用它，它非常好，我很好例如，在var qmls上使用它：'您可以更詳細地研究它，並將其與麻煩的代碼進行比較。 – Andrew