Create a Database Model (also known as Entity Relationship diagram) - Visio
Create er diagrams the shortened name for entity relationship diagrams and other Generate ERD diagrams automatically and visualize your database. Use the Entity Relationship stencil to model databases that are based on the Note: The Database Model diagram is only available in certain versions of Visio. . This ability is limited to only VisioModeler or later dictionary model .imd). Using Visio to create ER Diagrams Setting up Visio to do Crows Question /Article of: ' Entity Relationship Diagram to Data Dictionary.
ID - For the unique identification of company records. Repeat the steps for columns in Employee entity: ID - For the unique identification of employee records. There are several reporting tools you can select in producing a data dictionary. In this tutorial, let's try Doc. Composer from the toolbar. Select Build Doc from Scratch in Doc. This creates an empty report. What you have to do is to fill it up with contents.
In this tutorial, the data dictionary. Select Data Dictionary and drag it to the document.
Entity Relationship Diagram to Data Dictionary using Visio 2003
Release your mouse button to produce the content of data dictionary. Are you happy with the content? Let's try something different. Create a new document. Composer from the toolbar and then select Build Doc from Scratch in Doc. This time, select Basic template and drag it onto the document. Let's change the pages to show in landscape.
Click on Document Properties In the Document Properties window, open the Page Setup tab. Select Landscape for Page Orientation. Click OK to return to Doc. Look pretty nice now? Now, let's produce a Word document from Doc.
Click on the Export button at the top right corner of Doc. Composer, and then select Word Document In the Export Word Doc. You now got a Word document of your data dictionary.
Define a relationship in a Database Model diagram
In practice, you can send this to your client, the database administrator or anyone who need to refer to it. Part III - Keeping Data Dictionary Up-to-Date One of the most important, and yet challenging part of documenting a design is to keep the document up-to-date, showing the latest changes made in the design.
Imagine if you have added more entities in ERD, or have updated the definition of some entities, you probably need to update the data dictionary to reflect the latest changes. Composer provides you a 'refresh' function to accomplish this.
Add an entity Project from the Employee entity, with a One-to-Many relationship in between. Now, go back to your document with data dictionary.
On top of the document there is a toolbar. Click on the Refresh button. You should see the document content updated by showing the new entity in image. The wizard extracts the selected information and displays notes about the extraction process in the Output window. This ability is limited to only VisioModeler 2.
On the Database tab, in the Model group, click Import, and then click the model type. Type the path and file name for the model that you want to import, or click the Browse button to locate the model file, and then click Open. In the Import dialog box, click OK. Visio imports the file and displays its progress in the Output window. The imported tables are displayed in the Tables and Views window.
In the Tables and Views window, select the tables that you want to model, and then drag them onto the drawing page. After you create a database model diagram, the work of refining the diagram begins. You can add and customize tables and views, create relationships, and customize columns and data types. Tables Use the Entity shape to create a table in your diagram.
From either the Entity Relationship or Object Relational stencil, drag an Entity shape onto the drawing. Double-click the shape to open the Database Properties window.
Under Categories, click Definition and type a name for the table. Under Categories, click Columns, type a name, and choose a data type.
Select the Req'd check box for columns that can't have null values. Select the PK primary key check box for columns that uniquely identify each row in the database table.
Entity Relationship Diagram to Data Dictionary using Visio | Microsoft Office Forums
Columns Use the Database Properties window to add or change properties for columns, including data types and primary keys. Double-click the table in your diagram. In the Database Properties window, under Categories, click Columns. Click in the first empty Physical Name cell, and type a name.
To change the data type for a column, click the column's Data Type field, and then select a data type from the list or type it into the list. For example, you can type decimal 8,2 or char To prevent null values, select the Req'd check box.
To specify that the column is a primary key, select the PK check box. To see more column properties in addition to those that appear when you click the Columns category, select the column and then click Edit. Relationships Relationships use primary and foreign keys to allow databases to match a row in one table with a row in a related table. You can show those relationships in your diagram. In addition, you can set their cardinality for example, one-to-many and use either Crow's feet, Relational, or IDEF1X notation to show the cardinality.
You can't show many-to-many relationships with any of these notations in the Database Model Diagram template. Create a relationship between tables: Make sure that both tables are visible in the diagram. If you reverse engineered the model from an existing database, you may need to drag one or both from the Tables and Views window onto the drawing page.
Double-click the table that you want for the primary key side of the relationship. In the grid, click the column that you want to use to uniquely identify each row in the table, and select the PK check box to set it as the primary key. From the Object Relational or Entity Relationship stencil, drag a Relationship shape and drop it onto a blank space on the page. Connect the higher end to the table with the parent table. Connect the other end to the child table.
If the second table doesn't already contain a column with the same name as the primary key, the modeler adds it to the second table as a foreign key. If relationship lines disappear, on the Database tab, in the Manage group, click Display Options. On the Relationships tab, under Show, select the Relationships check box. Set the relationship's cardinality: In the Database Properties window, under Categories, click Miscellaneous.
Under Cardinality, choose the cardinality that best fits the relationship.
For one-to-many relationships, the best choice is either Zero or more or One or more. For one-to-one relationships, the best choice is either Zero or one or Exactly one. To make other refinements to your diagram such as creating indexes, check clauses, and triggers you can do the following: Create indexes Indexes improve the performance, or speed, of your database when you run a query. Open the database model diagram. Double-click the table to which you want to add an index, and in the Database Properties window, in the Categories list, click Indexes.
In the Create Index dialog box, type a name for the index, and then click OK. In the Index Type list, select an option to create a unique or non-unique index. In the Indexed Columns list, select the Asc check box to create an index that has an ascending sort order, or clear the check box to create an index that has a descending sort order. The database model diagram is updated. Create views You can think of a view as a saved query. Views are particularly handy if you need to repeatedly access the same information from multiple tables, or if you want to expose the data to users without letting them change the actual tables.
Set extended properties for tables and views Depending on your database management system DBMSyou may be able to set extended properties for tables or views to determine where they are stored. Double-click the table or view whose extended properties you want to set, and in the Database Properties window, in the Categories list, click Extended. Create check clauses Use check clauses to ensure that the data that is entered into a column is within a particular range of values. For example, you can create a check clause that requires the data in a column called "Age" to be over Double-click the table to open the Database Properties window.