system catalogue initial version

usql/usql_ddl.cpp

@@ -15,10 +15,35 @@ std::unique_ptr<Table> USql::execute_create_table(const CreateTableNode &node) {
 	Table table{node.table_name, node.cols_defs};
 	m_tables.push_back(table);
 
+	execute_create_table_sys_catalogue(node);
+
 	return create_stmt_result_table(0, "table created", 0);
 }
 
 
+bool USql::execute_create_table_sys_catalogue(const CreateTableNode &node) {
+	// usql_tables 
+	auto r = execute("insert into usql_tables(name, modified) values('" + node.table_name + "', false)");
+
+	// usql_columns 
+	for(const ColDefNode & col_def : node.cols_defs) {
+		std::string i {"insert into usql_columns(table_name, column_name, column_type, column_length, nullable, column_order) values("};
+					i += "'" + node.table_name + "', ";
+					i += "'" + col_def.name + "', ";
+					i += "'" + column_type_name(col_def.type) + "', ";
+					i += std::to_string(col_def.length) + ", ";
+					i += (col_def.null ?  "true, " : "false, ");
+					i += std::to_string(col_def.order);
+					i += ")";
+
+		auto r = execute(i);
+		// r->print();
+	}
+
+	return true;
+}
+
+
 std::unique_ptr<Table> USql::execute_create_index(const CreateIndexNode &node) {
 	Table *table_def = find_table(node.table_name);				// throws exception if not found
 	ColDefNode col_def = table_def->get_column_def(node.column_name);	// throws exception if not found
@@ -57,7 +82,6 @@ std::unique_ptr<Table> USql::execute_create_table_as_table(const CreateTableAsSe
 }
 
 
-
 std::unique_ptr<Table> USql::execute_drop(const DropTableNode &node) {
 	auto name_cmp = [node](const Table& t) { return t.m_name == node.table_name; };
 
@@ -70,11 +94,13 @@ std::unique_ptr<Table> USql::execute_drop(const DropTableNode &node) {
 	throw Exception("table not found (" + node.table_name + ")");
 }
 
+
 std::unique_ptr<Table> USql::execute_set(const SetNode &node) {
 	Settings::set_setting(node.name, node.value);
 	return create_stmt_result_table(0, "set succeeded", 1);
 }
 
+
 std::unique_ptr<Table> USql::execute_show(const ShowNode &node) {
 	std::string value = Settings::get_setting(node.name);
 	return create_stmt_result_table(0, "show succeeded: " + value, 1);