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Filed under: — cobwer @ July 9, 2011 5:14 am

Welcome to DiagramPad

DiagramPad is a Database and UML Modeling Tool. This application is under development and has not been released yet. You can access a testing version online; some functionality has been disabled.

Launch the application

Features

This version contains the following features:

  • Create Entity Relationship (ER) database Diagram using Chen’s notation
  • Edit with undo & redo changes, Save, Export as image, Print, etc.
  • Align the elements
  • Change colors

Get Started! My First ER Diagram

  • Create an Entity by double click on the empty area
  • When the Entity is Selected you can see a Popup menu

    • Select the diamond, drag and drop it to another Entity (or itself) to create a Relation
    • Select the oval then drag and drop it to an empty area to create an Attribute
    • Select the double-lined rectangle to transform into a weak entity (a relationship is required)
    • Resize a selected entity by drag a drop any squares around the border

  • Double Click on each entity (Entity, Relation or Attribute) to rename
  • The connection line can be altered by moving the mouse over the line then drag and drop the selector icon. You can also delete a point by double clicking it.
  • When the Relation is Selected you can see a Popup menu

    • Select the oval then drag and drop it to an empty area to create an Attribute
    • Select the other menu items to change the cardinality
  • When the Attribute is Selected you can see a Popup menu

    • Select the first oval then drag and drop it to an empty area to create an Attribute (This will be a Composite Attribute)
    • Select the double-lined oval to transform into a Multivalued Attribute
    • Select the oval with underscore to transform into a Key Attribute
    • Select the oval with dashed border to transform into a  Derived Attribute