To get detailed information about a specific relationship between table a and table b, double click on the relationship between those tables. You can read more about in ERwin documentation.”
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Identifying Relationship are always part of a Composite Primary Key. “The important thing to learn here is that these event_code and athlete_code Foreign Keys represent Identifying Relationship which is different from usual Non-identifying Relationship. These relationships are illustrated with a grey line connecting two tables where the round circle point to a referencing table. In addition, it has a foreign key relationship with event and athlete tables through event_code and athlete_code FK.
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In the above example, game table has host_year column in the above section which is a part of three-column Composite Primary Key (a PK defined by multiple columns). The lower section list the rest member columns. The above section list all keys (primary and foreign). Below is a partial view of our demodb database.Īs you notice, in ERwin Data Modeler each table can be visually divided into two by a horizontal line.
ERWIN DATA MODELER TUTORIAL DRIVER
Please refer to the tutorial for CUBRID ODBC driver connection.Īs the output of this process you will see the schema of your database.
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If " CUBRID' is not automatically selected as a value for ODBC Data Source parameter, click on it and choose " CUBRID". In the new modal view enter the database connection information such as User Name and Password. Once you have set the options, click Next to complete the reverse engineering process. ERwin will automatically detect them for you. If the target database which you are reverse engineering already defines these keys, you do not need to set anything in this Infer group. Since CUBRID is a relational DBMS, it allows to set Primary and Foreign Keys. Here you can choose which attributes of columns should Reverse Engineer infer from you database schema. Here we will reverse engineer only User Tables which we can edit later.įor User Tables you can also choose to reverse engineer only those table to which the current or the specified user has access to, or all the tables. Checking System Objects will get schema info for only System Tables. If you want to reserve engineer only User Tables which you use in your application, leave the System Objects check box unchecked. In CUBRID you have System Objects (Tables) and User Objects (Tables). On the left side of the Set Options modal window you can choose what type of objects you want to reverse engineer. You can remove check from Stored Procedure and View if you do not use them.
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On the left side of the window in the Items to Reverse Engineer group you can choose which objects you want to get the schema information of. At this moment Set Options modal window will popup. In ERwin terms Reverse Engineering is the process of transforming a Physical Data Model (PDM) from the actual database to a Logical Data Model (LDM) representation.Ī new empty Data Model document will be created and opened. Once you have installed ERwin (in this tutorial we use version 2020 R2 14677), start the program and choose from main menu Actions -> Reverse Engineer.
ERWIN DATA MODELER TUTORIAL HOW TO
To illustrate how to reverse engineer an existing database and get its schema information we will use the demodb database as an example, which you can choose to create when you install CUBRID RDBMS. This tutorial is part of CUBRID Data Modeling with ERwin series.