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120 lines
4.7 KiB
ReStructuredText
120 lines
4.7 KiB
ReStructuredText
.. _view_dialog:
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********************
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`View Dialog`:index:
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********************
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Use the *View* dialog to define a view. The view is not physically materialized;
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the query is executed each time the view is referenced in a query.
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The *View* dialog organizes the development of a View through the following
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dialog tabs: *General*, *Definition*, *Code* and *Security*". The *SQL* tab displays
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the SQL code generated by dialog selections.
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Click the *General* tab to begin.
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.. image:: images/view_general.png
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:alt: View dialog general tab
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:align: center
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Use the fields in the *General* tab to identify a view:
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* Use the *Name* field to add a descriptive name for the view. The name of the
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view must be distinct from the name of any other view, table, sequence, index
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or foreign table in the same schema. The name will be displayed in the
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*pgAdmin* tree control.
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* Use the drop-down listbox next to *Owner* to select the role that will own the
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view.
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* If applicable, select the name of the schema in which the view will reside
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from the drop-down listbox in the *Schema* field.
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* Store notes about the view in the *Comments* field.
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Click the *Definition* tab to continue.
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.. image:: images/view_definition.png
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:alt: View dialog definition tab
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:align: center
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Use the fields in the *Definition* tab to define properties of the view:
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* Set the *Security Barrier* switch to *Yes* to indicate that the view is to act
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as a security barrier. For more information about defining and using a
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security barrier rule, see Rules and Privileges of the PostgreSQL documentation.
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* Set the *Security Invoker* switch to *Yes* to indicate that the underlying base
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relations are to be checked against the privileges of the user of the view rather
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than the view owner. This option is available from PostgreSQL 15 onwards.
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* Use the drop-down listbox next to *Check options* to select from *No*, *Local*
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or *Cascaded*:
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* The *Local* option specifies that new rows are only checked against the
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conditions defined in the view. Any conditions defined on underlying base
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views are not checked (unless you specify the CHECK OPTION).
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* The *Cascaded* option specifies new rows are checked against the conditions
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of the view and all underlying base views.
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Click the *Code* tab to continue.
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.. image:: images/view_code.png
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:alt: View dialog code tab
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:align: center
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Use the workspace in the *Code* tab to write a query to create a view.
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Click the *Security* tab to continue.
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.. image:: images/view_security.png
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:alt: View dialog security tab
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:align: center
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Use the *Security* tab to assign privileges and define security labels.
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Use the *Privileges* panel to assign privileges to a role. Click the *Add* icon
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(+) to set privileges for the view:
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* Select the name of the role that will be granted privileges from the drop-down
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listbox in the *Grantee* field.
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* Click inside the *Privileges* field. Check the boxes to the left of one or
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more privileges to grant the selected privilege to the specified user.
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* The current user, who is the default grantor for granting the privilege, is displayed in the *Grantor* field.
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Click the *Add* icon (+) to assign additional privileges; to discard a
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privilege, click the trash icon to the left of the row and confirm deletion in
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the *Delete Row* popup.
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Use the *Security Labels* panel to define security labels applied to the view.
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Click the *Add* icon (+) to add each security label selection:
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* Specify a security label provider in the *Provider* field. The named provider
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must be loaded and must consent to the proposed labeling operation.
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* Specify a a security label in the *Security Label* field. The meaning of a
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given label is at the discretion of the label provider. PostgreSQL places no
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restrictions on whether or how a label provider must interpret security
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labels; it merely provides a mechanism for storing them.
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Click the *Add* icon (+) to assign additional security labels; to discard a
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security label, click the trash icon to the left of the row and confirm deletion
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in the *Delete Row* popup.
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Click the *SQL* tab to continue.
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Your entries in the *View* dialog generate a SQL command (see an example below).
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Use the *SQL* tab for review; revisit or switch tabs to make any changes to the
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SQL command.
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Example
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*******
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The following is an example of the sql command generated by user selections in
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the *View* dialog:
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.. image:: images/view_sql.png
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:alt: View dialog sql tab
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:align: center
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The example shown demonstrates creating a view named *distributor_code*.
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* Click the *Info* button (i) to access online help.
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* Click the *Save* button to save work.
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* Click the *Close* button to exit without saving work.
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* Click the *Reset* button to restore configuration parameters.
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