start QAD::SQL library

QAD::SQLQuery wrapper to minimize code of QSqlQuery usage

libs/sql/CMakeLists.txt

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+qad_library(sql "Gui;Widgets;Sql" "qad_utils")

libs/sql/lang/update.bat

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+lupdate ../ -ts qad_sql_ru.ts
+lupdate ../ -ts qad_sql_en.ts

libs/sql/sql_query.cpp

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+#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;
+}

libs/sql/sql_query.h

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+/*
+    QAD - Qt ADvanced
+
+	Ivan Pelipenko peri4ko@yandex.ru
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef sql_query_H
+#define sql_query_H
+
+#include "qad_sql_export.h"
+
+#include <QMap>
+#include <QSqlError>
+#include <QSqlQuery>
+#include <QVariant>
+
+
+namespace QAD {
+
+class QAD_SQL_EXPORT SQLQuery {
+public:
+	SQLQuery(QString query_ = QString(), QVariantMap params = QVariantMap(), QSqlDatabase db = QSqlDatabase());
+	~SQLQuery();
+
+	struct Result {
+		bool ok           = false;
+		QVariant insertId = -1;
+	};
+
+	typedef std::function<void(QString, QVariantMap, QSqlError)> HandlerFail;
+
+	QSqlQuery & query() { return q; }
+
+	static Result exec(QString query_, QVariantMap params = QVariantMap(), QSqlDatabase db = QSqlDatabase());
+
+	static void setFailHandler(HandlerFail h);
+
+protected:
+	QSqlQuery q;
+
+private:
+	struct Singleton {
+		static Singleton * instance();
+		HandlerFail fail_handler;
+	};
+};
+
+} // namespace QAD
+
+#endif