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