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#include <QFile>
#include <QDomElement>
#include <QSqlQuery>
#include <QSqlDatabase>
#include <QSqlDriver>
#include <QSqlField>
#include <QVariant>
#include "memdbloader.h"
const QString memDbName = ":memory:";
MemDbLoader::MemDbLoader()
{
}
MemDbLoader::~MemDbLoader()
{
}
QString MemDbLoader::createMemoryDB(QString id)
{
if(!QSqlDatabase::isDriverAvailable("QSQLITE")) {
return "SQLITE plugin not available - data can't be loaded";
}
if(id.isEmpty() || !QSqlDatabase::contains(id)) {
QSqlDatabase db = id.isEmpty() ? QSqlDatabase::addDatabase("QSQLITE") : QSqlDatabase::addDatabase("QSQLITE", id);
db.setDatabaseName(memDbName);
}
return "";
}
// Load the DB from a file
bool MemDbLoader::load(const QString &filename, QSqlDatabase db)
{
QFile * f = new QFile(filename);
QDomDocument doc = QDomDocument();
QString errMsg;
int errLine, errCol;
if(!doc.setContent(f,&errMsg,&errLine,&errCol)) {
_lastError = QString().sprintf("Encountered and error while parsing %s\n\n\t%s (Line %d Column %d)",filename.toLatin1().data(),errMsg.toLatin1().data(),errLine,errCol);
return false;
}
QDomElement root = doc.documentElement();
return load(root, db);
}
// Load the DB from a DomElement
bool MemDbLoader::load(const QDomElement & elemSource, QSqlDatabase db)
{
_lastError = "";
// Login to the SQLITE memory DB
if(db.isOpen()) {
db.close();
db.open();
}
if(db.databaseName() != memDbName) {
_lastError = createMemoryDB();
if(!_lastError.isEmpty()) {
return false;
}
db = QSqlDatabase::database();
if(!db.open()) {
_lastError = "Error opening QSQLITE memory database";
return false;
}
}
_db = db;
QDomNodeList nlist = elemSource.childNodes();
for(int i = 0; i < nlist.count(); i++ ) {
QDomElement it = nlist.item(i).toElement();
if(it.tagName()=="table") {
parseTable(it.toElement());
}
}
return _lastError.isEmpty();
}
void MemDbLoader::parseTable(const QDomElement & elemSource)
{
_tableName = elemSource.attribute("name");
_columnNames.clear();
QDomNodeList nlist = elemSource.childNodes();
for(int i = 0; i < nlist.count(); i++ ) {
QDomElement it = nlist.item(i).toElement();
if(it.tagName()=="columns") {
parseColumns(it);
}
else if(it.tagName()=="record") {
parseRecord(it);
}
}
}
void MemDbLoader::parseColumns(const QDomElement & elemSource)
{
if(_tableName.isEmpty()) {
_lastError = "Error: missing table name";
return;
}
QString myQuery = "CREATE TABLE " + _tableName + " (";
QDomNodeList nlist = elemSource.childNodes();
bool firstCol = true;
for(int i = 0; i < nlist.count(); i++ ) {
QDomElement it = nlist.item(i).toElement();
if(it.tagName()=="column") {
QString colName = it.text();
QString colType = it.attribute("type");
if(colType.isEmpty()) {
colType = "TEXT";
}
if(!firstCol) {
myQuery += ", ";
}
firstCol = false;
myQuery += colName + " " + colType;
_columnNames << colName;
}
}
myQuery += ")";
QSqlQuery query(_db);
if(!query.exec(myQuery)) {
_lastError = "Failed Query: " + myQuery;
return;
}
}
void MemDbLoader::parseRecord(const QDomElement & elemSource)
{
QString myQuery = "INSERT INTO " + _tableName + " (";
bool firstCol = true;
foreach (QString val, _columnNames) {
if(!firstCol) {
myQuery += ", ";
}
firstCol = false;
myQuery += val;
}
myQuery += ") VALUES (";
QSqlQuery query(_db);
QDomNodeList nlist = elemSource.childNodes();
firstCol = true;
for(int i = 0; i < nlist.count(); i++ ) {
QDomElement it = nlist.item(i).toElement();
if(it.tagName()=="val") {
if(!firstCol) {
myQuery += ", ";
}
firstCol = false;
QSqlField field(_columnNames.at(i), QVariant::String);
field.setValue(it.text());
myQuery += query.driver()->formatValue (field);
}
}
myQuery += ")";
if(!query.exec(myQuery)) {
_lastError = "Failed Query: " + myQuery;
return;
}
}
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