Introduction to reverse engineering of C + + code using rational rose __c++

In October 2004, IBM unveiled the visual modeling tools that support the latest UML2.0, rational Software Architect (see annotation ①) and IBM Rational Software Modeler (see note ②). While they support better improvements in modeling capabilities and support for newer standards, RSA's wonderful features are focused on support for Java applications, while IBM Rational Software Modeler is a major focus on the system's model design, if you want to analyze the structure of C + + Code for the system, Rational rose is still the preferred tool.

The next article will explain in more detail how to use rational Rose's reverse-transfer project for systematic analysis.

A Introduction to reverse engineering of Rational Rose

Reverse engineering (Reverse Engineer) is the ability to generate models from the code of an existing system. The main purpose of analyzing existing code is to understand the code structure and data structure, which correspond to the model diagram is class diagram, data Model Diagram and component diagram (the description of UML various model diagrams see annotation ③), which is the result of the reverse engineering of rational rose. The reverse engineering features supported by Rational Rose are powerful, including programming languages such as C + +, VB, VC, Java, CORBA, database DDL scripts, and so on, and can be directly connected to DB2, SQL Server, Databases such as Oracle and Sybase import schemas and generate data models.

Many large-scale C + + developed products are related to the use of the database, the development of such a large system, especially in the case of two development, the main difficulty is the source code and database structure analysis. And using Rose's reverse-engineering function, can complete the code ' class diagram as well as the database schema-> data Model Diagram Transformation, solves these two difficult points, may enable the development and the design personnel in to this large-scale system upgrade, the analysis and the development, more convenient, the quick, the orderly grasps the system structure, No more headaches for analyzing the huge system structure.

Two How to use rational rose for C + + code Analysis

This section focuses on how users can generate UML models using Rose's reverse engineering and use it for structural analysis of C + + code.

Rational Rose can support the model of standard C + + and Visual C + + to code conversion and reverse engineering. The following is a detailed description of the reverse engineering steps and specific actions for both C + + project.

1. ANSI C + + (standard C + +) Reverse engineering (Reverse Engineer) uses standard C + + reverse engineering to create a component (component) in a Component diagram (component view) that sets up information about the components that need to be converted, That is, the language of the component, the files contained, the path to the file, the file suffix, and so on, and then reverse engineer can convert the code to a class diagram based on the information given.

A) Right-click the component view (Component view), select New->component, and create a new component

b) Set the component language property to ANSI C + +

① Select the created component, right-click and select Open Specification

② in this dialog box, set the component language to ANSI C + +

(c) Configure the ANSI C + + component, set up the C + + code files contained in the component, and make detailed settings for the C + + language

① Select the component, right-click, and select ANSI C++->open ANSI C + + specification

② sets the source file root directory to the path of your C + + source file, and adds the files that need to be converted to project files, depending on your needs for other settings, such as the header file name extension, and so on.

D Convert the set of component to a model diagram

① Select the set of component, right-click, select ANSI C++->reverse Engineer

② select the class that needs to be converted, click OK, and a component reverse conversion is complete.

2. When Visual C + + uses this feature, it requires visual Studio to be installed on the user's machine at the same time. The reverse engineering of Visual C + + also requires that you first create a component and set the component language property to VC + +. Rational Rose's conversion to VC + + model is realized by reading the information of VC + + project file, and the user only needs to assign the corresponding project file information to component.

(a) Assign VC + + project information to the component that you just created.

① Select the component, right-click and select Assign to Project

② in the dialog box to find the component you just created, right-click and select Properties.

③ in the dialog box below, select project that needs to be converted, click OK, and the component is associated with project that needs to be converted.

b converting the component into a model diagram

Select the set of component, click the right button, Update Model ..., will pop up the confirmation dialog box, select the class to be converted, click Finish on it.

Three How to analyze the database structure with rational Rose

Using rational rose to design and export DDL language scripts from the relational database model, you can also import the existing DDL script generation data model and connect SQL Server, DB2, Oracle and other databases and import the database schema generation data model.

Here's an example of SQL Server to illustrate the steps of the reverse conversion project.

A) First, select Tools->data modeler-> Reverse Engineer

(b) In the process of reverse engineering conversion, you can choose whether to convert from database or DDL script, and if it is a DDL script conversion, give the location of the DDL script file directly. This example shows the process of connecting a SQL Server database to the build data model, so select the database and go to the next step.

(c) Fill in the database related information

d) Select all schemas that need to be converted

e Select which database elements you want to import into the data model

The conversion operation automatically adds a database component to the component diagram (Component view) and generates a data model in the logical diagram (Logical view) that starts with the name "Schema".

Open the data model to see the individual tables and views that have been converted from the database.

You can see the structure of the table and the logical relationship between the tables and views from the data Model diagram.

Four How to get the Model diagram of reverse engineering

In rational rose, some model diagrams are not generated automatically, and many times this work requires manual completion by the user. That is, Rational Rose is only responsible for generating models, including the elements in the model, the attributes of the elements, and the relationships among the elements, but requires the user to do some extra work to get the view.

First, through reverse engineering, the user has got the UML model or the various components of the data model and the relationship between them. The next step is to create a view on the model that can be a class diagram (class diagram, describing the static structure of the system) or a data Model diagram (the Digram, which describes the relational data structure). Then, manually drag elements from the left side of the explorer into the view, in which the associations between the elements are automatically represented in the diagram without requiring the user to do other work.

For example: the process of generating a data model diagram for a data model

From the left, drag the data element from the data model to the data Model diagram on the right, the diamond arrows for the dependencies between the table Customercustomerdemo and the table Customerdemographics are generated automatically without manual action.

In general, a system involves a lot of data elements, resulting in a crowded view, layout is very difficult. The automatic typesetting feature provided by Rational Rose is a convenient way to help users solve this problem.

By selecting Format->layout Diagram, the system rearranges all the elements in the diagram in the best way, giving the user a clear view.

Five Summarize

Understanding the reverse engineering function of rational rose, users can easily use this tool for the analysis and research of large database-related C + + systems.