reorganizing class hierarchy

git-svn-id: svn://ttmath.org/publicrep/morm/trunk@1075 e52654a7-88a9-db11-a3e9-0013d4bc506e

src/dbconnector.cpp

@@ -0,0 +1,184 @@
+/*
+ * This file is a part of morm
+ * and is distributed under the 2-Clause BSD licence.
+ * Author: Tomasz Sowa <t.sowa@ttmath.org>
+ */
+
+/*
+ * Copyright (c) 2018, Tomasz Sowa
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "dbconnector.h"
+#include "model.h"
+
+
+namespace morm
+{
+
+DbConnector::DbConnector()
+{
+	db_expression = nullptr;
+	expression_allocated = false;
+}
+
+
+DbConnector::~DbConnector()
+{
+	deallocate_expression();
+}
+
+
+
+bool DbConnector::query(PT::TextStream & stream)
+{
+	return false;
+}
+
+
+bool DbConnector::query(const std::wstring & query)
+{
+	return false;
+}
+
+
+bool DbConnector::query(const std::string & query)
+{
+	return false;
+}
+
+
+bool DbConnector::query(const wchar_t * query)
+{
+	return false;
+}
+
+
+bool DbConnector::query(const char * query)
+{
+	// do query
+	return false;
+}
+
+
+
+
+DbExpression * DbConnector::get_expression()
+{
+	allocate_default_expression_if_needed();
+	return db_expression;
+}
+
+
+
+void DbConnector::generate_insert_query(PT::TextStream & stream, Model & model)
+{
+	allocate_default_expression_if_needed();
+
+	if( db_expression )
+	{
+		db_expression->set_output_type(MORM_OUTPUT_TYPE_DB_UPDATE);
+
+		stream << "insert into ";
+		model.table_name(stream);
+		stream << " (";
+		db_expression->set_work_mode(MORM_WORK_MODE_MODEL_FIELDS);
+		db_expression->generate_from_model(stream, model);
+
+		stream << ") values (";
+		db_expression->set_work_mode(MORM_WORK_MODE_MODEL_VALUES);
+		db_expression->generate_from_model(stream, model);
+		stream << ")";
+	}
+}
+
+
+void DbConnector::generate_update_query(PT::TextStream & stream, Model & model)
+{
+	allocate_default_expression_if_needed();
+
+	if( db_expression )
+	{
+		db_expression->set_output_type(MORM_OUTPUT_TYPE_DB_UPDATE);
+
+		stream << "update ";
+		model.table_name(stream);
+		stream << " set (";
+		db_expression->set_work_mode(MORM_WORK_MODE_MODEL_FIELDS);
+		db_expression->generate_from_model(stream, model);
+
+		stream << ") values (";
+		db_expression->set_work_mode(MORM_WORK_MODE_MODEL_VALUES);
+		db_expression->generate_from_model(stream, model);
+
+		stream << ") where ";
+		db_expression->set_work_mode(MORM_WORK_MODE_MODEL_FIELDS_VALUES);
+		db_expression->set_output_type(MORM_OUTPUT_TYPE_DB_PRIMARY_KEY);
+		db_expression->generate_from_model(stream, model);
+	}
+}
+
+
+
+void DbConnector::insert(PT::TextStream & stream, Model & model)
+{
+	generate_insert_query(stream, model);
+	// do the real inserting
+	// query(stream);
+	// and get autogenerated columns
+}
+
+
+void DbConnector::update(PT::TextStream & stream, Model & model)
+{
+	generate_update_query(stream, model);
+	// do the real updating
+	// query(stream);
+	// and get autogenerated columns
+}
+
+
+void DbConnector::deallocate_expression()
+{
+	if( expression_allocated )
+	{
+		delete db_expression;
+		db_expression = nullptr;
+		expression_allocated = false;
+	}
+}
+
+
+
+void DbConnector::allocate_default_expression_if_needed()
+{
+	if( !db_expression )
+	{
+		allocate_default_expression();
+	}
+}
+
+}