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| <title>Managing entities</title> |
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| <div class="sect1"> |
| <!-- infolevel="all" infotype="General" --> |
| <h1>Managing entities</h1> |
| <td><p>You can perform the following operations on a |
| particular entity graphical model:</p> |
| <div> |
| <ul> |
| <li><p>Rename entities</p> |
| <p> |
| In terms of source code, this operation changes the |
| <tt title="Output">name</tt> |
| attribute of the |
| <tt title="Output">@Entity</tt> |
| annotation only. |
| </p> |
| </li> |
| <li><p>Add, rename, or remove attributes</p> |
| <div> |
| <p> |
| <b>Note:</b> |
| </p> |
| <p> |
| The Eclipse IDE automatically generates getter and setter |
| methods for new attributes. The default data type for new |
| attributes is |
| <tt title="Output">java.lang.String</tt> |
| . |
| </p> |
| <p>In terms of source code, renaming attributes changes the |
| field names of entities, together with the fields' getter and |
| setter methods.</p> |
| <p>Removing attributes removes them from the data model also.</p> |
| <div>End of the note.</div> |
| </div> |
| </li> |
| <li><p>Collapse or expand entities or attribute groups</p></li> |
| <li><p>Save or discard your changes</p></li> |
| <li><p>Save or discard your changes and remove the entity |
| from the diagram without removing it from the application data |
| model</p></li> |
| <li><p>Remove the entity from the diagram and delete it |
| from the application data model</p></li> |
| </ul> |
| </div> |
| <p>To perform the actions described above, follow the steps:</p> |
| <div> |
| <ol> |
| <li><p>Position the mouse cursor over the entity you want |
| to manage.</p> |
| <p>A button bar appears by the entity.</p> |
| <div> |
| <p> |
| <img src="../img/jpa_diagram_entity_operations.gif" |
| alt="This graphic is explained in the accompanying text." |
| title="This graphic is explained in the accompanying text." /> |
| </p> |
| <br /> |
| </div> |
| </li> |
| <li><p>Choose the relevant pushbutton. Each button has an |
| informative tooltip that describes the relevant operation.</p></li> |
| <li><p> |
| To rename an entity or an attribute, double-click the title of an |
| entity or the attribute, change the name, and choose |
| <kbd title="Keyboard button">ENTER</kbd> |
| . |
| </p></li> |
| <li><p> |
| To remove an attribute, click the attribute and choose |
| <kbd title="Keyboard button">DELETE</kbd> |
| or choose <i>Delete</i> in the context menu. |
| </p> |
| <p> |
| You can also remove an attribute by positioning the mouse cursor |
| over the attribute and choosing the <i>Delete Attribute</i> |
| pushbutton. |
| </p> |
| <div> |
| <p> |
| <img src="../img/jpa_diagram_delete_attribute.gif" |
| alt="This graphic is explained in the accompanying text." |
| title="This graphic is explained in the accompanying text." /> |
| </p> |
| <p /> |
| </div> |
| </li> |
| </ol> |
| </div> |
| </td> |
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