start QAD::SQL library

QAD::SQLQuery wrapper to minimize code of QSqlQuery usage

libs/sql/sql_query.cpp

@@ -0,0 +1,45 @@
+#include "sql_query.h"
+
+#include <QDebug>
+
+
+QAD::SQLQuery::SQLQuery(QString query_, QVariantMap params, QSqlDatabase db): q(db) {
+	QMapIterator<QString, QVariant> it(params);
+	while (it.hasNext()) {
+		it.next();
+		query_.replace("${" + it.key() + "}", it.value().toString());
+	}
+	q.prepare(query_);
+	it.toFront();
+	while (it.hasNext()) {
+		it.next();
+		q.bindValue(":" + it.key(), it.value());
+	}
+}
+
+
+QAD::SQLQuery::~SQLQuery() {}
+
+
+QAD::SQLQuery::Result QAD::SQLQuery::exec(QString query_, QVariantMap params, QSqlDatabase db) {
+	QAD::SQLQuery::Result ret;
+	QAD::SQLQuery q(query_, params, db);
+	if (q.q.exec()) {
+		ret.ok       = true;
+		ret.insertId = q.q.lastInsertId();
+		return ret;
+	}
+	if (Singleton::instance()->fail_handler) Singleton::instance()->fail_handler(q.q.lastQuery(), params, q.q.lastError());
+	return ret;
+}
+
+
+void QAD::SQLQuery::setFailHandler(QAD::SQLQuery::HandlerFail h) {
+	Singleton::instance()->fail_handler = h;
+}
+
+
+QAD::SQLQuery::Singleton * QAD::SQLQuery::Singleton::instance() {
+	static QAD::SQLQuery::Singleton ret;
+	return &ret;
+}