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98 lines
3.9 KiB
ReStructuredText
98 lines
3.9 KiB
ReStructuredText
.. _language:
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************************
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`Language Dialog`:index:
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************************
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Use the CREATE LANGUAGE dialog to register a new procedural language.
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The *Language* dialog organizes the registration of a procedural language
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through the following dialog tabs: *General*, *Definition*, and *Security*.
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The *SQL* tab displays the SQL code generated by dialog selections.
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.. image:: images/language_general.png
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:alt: Language dialog general tab
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:align: center
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Use the fields in the *General* tab to identify a language:
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* Use the drop-down listbox next to *Name* to select a language script.
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* Use the drop-down listbox next to *Owner* to select a role.
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* Store notes about the language in the *Comment* field.
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Click the *Definition* tab to continue.
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.. image:: images/language_definition.png
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:alt: Language dialog definition tab
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:align: center
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Use the fields in the *Definition* tab to define parameters:
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* Move the *Trusted?* switch to the *No* position to specify only users with
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PostgreSQL superuser privilege can use this language. The default is *Yes*.
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* When enabled, use the drop-down listbox next to *Handler Function* to select
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the function that will be called to execute the language's functions.
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* When enabled, use the drop-down listbox next to *Inline Function* to select
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the function that will be called to execute an anonymous code block (DO
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command) in this language.
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* When enabled, use the drop-down listbox next to *Validator Function* to
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select the function that will be called when a new function in the language
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is created, to validate the new function.
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Click the *Security* tab to continue.
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.. image:: images/language_security.png
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:alt: Language 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 database objects:
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* Select the name of the role from the drop-down 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
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function. 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 *Language* dialog generate a SQL command (see an example
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below). Use the *SQL* tab for review; revisit or switch tabs to make any changes
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to the 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 *Language* dialog:
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.. image:: images/language_sql.png
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:alt: Language dialog sql tab
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:align: center
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The example shown demonstrates creating the trusted procedural language named *mylan*.
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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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