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233 lines
15 KiB
ReStructuredText
233 lines
15 KiB
ReStructuredText
.. _erd_tool:
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*****************
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`ERD Tool`:index:
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*****************
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The Entity-Relationship Diagram (ERD) tool is a database design tool that provides a graphical representation of database tables, columns, and inter-relationships. ERD can give sufficient information for the database administrator to follow when developing and maintaining the database. The ERD Tool allows you to:
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* Design and visualize the database tables and their relationships.
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* Add notes to the diagram.
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* Auto-align the tables and links for cleaner visualization.
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* Save the diagram and open it later to continue working on it.
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* Generate ready to run SQL from the database design.
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* Generate the database diagram for an existing database.
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.. image:: images/erd_tool.png
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:alt: ERD tool window
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:align: center
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You can open multiple copies of the ERD tool in individual tabs simultaneously. To close a copy of the ERD tool, click the *X* in the upper-right hand corner of the tab bar.
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Toolbar
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*******
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The *ERD Tool* toolbar uses context-sensitive icons that provide shortcuts to frequently performed tasks. The option is enabled for the highlighted icon and is disabled for the grayed-out icon.
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.. image:: images/erd_tool_toolbar.png
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:alt: ERD tool toolbar
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:align: center
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Hover over an icon on Toolbar to display a tooltip that describes the icon's functionality.
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File Options
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************
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.. table::
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:class: longtable
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:widths: 1 4 1
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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| Icon | Behavior | Shortcut |
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+======================+===================================================================================================+================+
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| *Open File* | Click the *Open File* icon to load a previously saved diagram. | Ctrl + O |
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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| *Save* | Click the *Save* icon to perform a quick-save of a previously saved diagram, or to save the | Ctrl + S |
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| | diagram to a file. | |
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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| *Save as* | Click the *Save As* to open a new browser dialog and specify a new location to save the diagram. | Ctrl + Shift + |
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| | | S |
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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Export Options
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**************
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.. table::
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:class: longtable
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:widths: 1 4 1
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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| Icon | Behavior | Shortcut |
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+======================+===================================================================================================+================+
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| *Generate SQL* | Click the *Generate SQL* icon to generate the DDL SQL for the diagram and open a query tool | Option + Ctrl +|
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| | with the generated SQL ready for execution. | S |
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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Editing Options
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***************
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.. table::
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:class: longtable
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:widths: 1 4 1
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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| Icon | Behavior | Shortcut |
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+======================+===================================================================================================+================+
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| *Add table* | Click this button to add a new table to the diagram. On clicking, this will open a table dialog | Option/Alt + |
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| | where you can put the table details. | Ctrl + A |
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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| *Edit table* | Click this button to edit a table on the diagram. On clicking, this will open a table dialog | Option/Alt + |
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| | where you can change table details. This will enable when a table is selected. | Ctrl + E |
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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| *Clone table* | Click this button to clone the complete table structure, name it with a auto generated name and | Option/Alt + |
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| | put it in the diagram. | Ctrl + C |
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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| *Drop table/link* | You can drop a table or link using this button. You need to select a table or link and click on | Option/Alt + |
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| | this button to drop it. | Ctrl + D |
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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Table Relationship Options
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**************************
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.. table::
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:class: longtable
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:widths: 1 4 1
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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| Icon | Behavior | Shortcut |
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+======================+===================================================================================================+================+
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| *1M* | Click this button to open a one-to-many relationship dialog to add a relationship between the | Option/Alt + |
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| | two tables. The selected table becomes the referencing table and will have the *many* endpoint of | Ctrl + O |
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| | the link. | |
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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| *MM* | Click this button to open a many-to-many relationship dialog to add a relationship between the | Option/Alt + |
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| | two tables. This option will create a new table based on the selected columns for the two relating| Ctrl + M |
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| | tables and link them. | |
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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Utility Options
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***************
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.. table::
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:class: longtable
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:widths: 1 4 1
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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| Icon | Behavior | Shortcut |
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+======================+===================================================================================================+================+
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| *Add/Edit note* | Click this button to make notes on tables nodes while designing the database. | Option/Alt + |
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| | | Ctrl + N |
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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| *Auto align* | Click this button to auto align all tables and links to make it look more cleaner. | Option/Alt + |
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| | | Ctrl + L |
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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| *Show details* | Click this button to toggle the column details visibility. It allows you to show few or more | Option/Alt + |
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| | column details. | Shift + D |
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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Zoom Options
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************
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.. table::
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:class: longtable
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:widths: 1 4 1
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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| Icon | Behavior | Shortcut |
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+======================+===================================================================================================+================+
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| *Zoom to fit* | Click this button to zoom in/out automatically and fit all the tables to the view. | Option/Alt + |
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| | | Shift + F |
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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| *Zoom in* | Click this button to zoom in the diagram. | Option/Alt + |
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| | | Shift + "+" |
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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| *Zoom out* | Click this button to zoom out the diagram. | Option/Alt + |
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| | | Shift + "-" |
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+----------------------+---------------------------------------------------------------------------------------------------+----------------+
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Table Dialog
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.. image:: images/erd_table_dialog.png
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:alt: ERD tool table dialog
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:align: center
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The table dialog allows you to:
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* Change the table structure details.
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* It can be used edit an existing table or add a new one.
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* Refer :ref:`table dialog <table_dialog>` for information on different fields.
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Table Node
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**********
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.. image:: images/erd_table_node.png
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:alt: ERD tool table node
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:align: center
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The table node shows table details in a graphical representation:
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* The top bar has a *details toggle button* that is used to toggle column details visibility. There is also a *note button* that is visible only if there is some note added. you can click on this button to quickly change the note.
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* The first row shows the schema name of the table. Eg. *public* in above image.
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* The second row shows the table name. Eg. *users* in above image.
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* All other rows below the table name are the columns of the table along with data type. If the column is a primary key then it will have lock key icon eg. id is the primary key in above image. Otherwise, it will have column icon.
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* you can click on the node and drag to move on the canvas.
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* Upon double click on the table node or by clicking the edit button from the toolbar, the table dialog opens where you can change the table details. Refer :ref:`table dialog <table_dialog>` for information on different fields.
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The One to Many Link Dialog
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***************************
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.. image:: images/erd_1m_dialog.png
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:alt: ERD tool 1M dialog
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:align: center
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The one to many link dialog allows you to:
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* Add a foreign key relationship between two tables.
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* *Local Table* is the table that references a table and has the *many* end point.
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* *Local Column* the column that references.
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* *Referenced Table* is the table that is being referred and has the *one* end point.
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* *Referenced Column* the column that is being referred.
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The Many to Many Link Dialog
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****************************
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.. image:: images/erd_mm_dialog.png
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:alt: ERD tool MM dialog
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:align: center
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The many to many link dialog allows you to:
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* Add a many to many relationship between two tables.
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* It creates a relationship tables having columns derived from the two tables and link them to the tables.
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* *Left Table* is the first table that is to be linked. It will receive the *one* endpoint of the link with the new relation table.
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* *Left Column* the column of the first table, that will always be a primary key.
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* *Right Table* is the second table that is to be linked. It will receive the *one* endpoint of the link with the new relation table.
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* *Right Column* the column of the second table, that will always be a primary key.
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The Table Link
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**************
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.. image:: images/erd_table_link.png
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:alt: ERD tool table link
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:align: center
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The table link shows relationship between tables:
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* The single line endpoint of the link shows the column that is being referred.
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* The three line endpoint of the link shows the column that refers.
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* If one of the columns that is being referred or that refers is removed from the table then the link will get dropped.
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* you can click on the link and drag to move on the canvas.
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The Table Notes
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***************
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.. image:: images/erd_table_note.png
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:alt: ERD tool table note
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:align: center
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* You can use the notes popup to mark some notes while designing the database.
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* You open the pop-up using the toolbar note button.
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* If some note is added to a table then it will have notes button on the table node. You can click on the button to check/update notes.
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