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169 lines
6.9 KiB
ReStructuredText
169 lines
6.9 KiB
ReStructuredText
.. _procedure_dialog:
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*************************
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`Procedure Dialog`:index:
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*************************
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Use the *Procedure* dialog to create a procedure; procedures are supported by
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PostgreSQL v11+ and EDB Postgres Advanced Server. The *Procedure* dialog allows
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you to implement options of the CREATE PROCEDURE command.
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The *Procedure* dialog organizes the development of a procedure through the
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following dialog tabs: *General*, *Definition*, *Options*, *Arguments*,
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*Parameters*, and *Security*. The *SQL* tab displays the SQL code generated by
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dialog selections.
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.. image:: images/procedure_general.png
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:alt: Procedure dialog general tab
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:align: center
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Use the fields in the *General* tab to identify a procedure:
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* Use the *Name* field to add a descriptive name for the procedure. The name
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will be displayed in the *pgAdmin* tree control.
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* Use the drop-down listbox next to *Owner* to select a role.
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* Select the name of the schema in which the procedure will reside from the
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drop-down listbox in the *Schema* field.
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* Store notes about the procedure in the *Comment* field.
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Click the *Definition* tab to continue.
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.. image:: images/procedure_definition.png
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:alt: Procedure dialog definition tab
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:align: center
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Use the fields in the *Definition* tab to define the procedure:
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* Use the drop-down listbox next to *Language* to select a language. The default
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is *edbspl*.
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* Use the *Code* field to specify the code that will execute when the procedure
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is called.
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Click the *Options* tab to continue.
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.. image:: images/procedure_options.png
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:alt: Procedure dialog options tab
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:align: center
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Use the fields in the *Options* tab to describe or modify the behavior of the
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procedure:
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* Use the drop-down listbox under *Volatility* to select one of the following.
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*VOLATILE* is the default value.
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* *VOLATILE* indicates that the value can change even within a single table
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scan, so no optimizations can be made.
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* *STABLE* indicates that the procedure cannot modify the database, and that
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within a single table scan it will consistently return the same result for
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the same argument values, but that its result could change across SQL
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statements.
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* *IMMUTABLE* indicates that the procedure cannot modify the database and
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always returns the same result when given the same argument values.
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* Move the *Strict?* switch to indicate if the procedure always returns NULL
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whenever any of its arguments are NULL. If *Yes*, the procedure is not
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executed when there are NULL arguments; instead a NULL result is assumed
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automatically. The default is *No*.
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* Move the *Security of definer?* switch to specify that the procedure is to be
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executed with the privileges of the user that created it. The default is *No*.
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* Use the *Estimated cost* field to specify a positive number representing the
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estimated execution cost for the procedure, in units of cpu_operator_cost. If
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the procedure returns a set, this is the cost per returned row.
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* Move the *Leak proof?* switch to indicate whether the procedure has side
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effects — it reveals no information about its arguments other than by its
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return value. The default is *No*.
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Click the *Arguments* tab to continue.
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.. image:: images/procedure_arguments.png
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:alt: Procedure dialog arguments tab
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:align: center
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Use the fields in the *Arguments* tab to define an argument. Click *Add* to set
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parameters and values for the argument:
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* Use the drop-down listbox next to *Data type* to select a data type.
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* Use the drop-down listbox next to *Mode* to select a mode. Select *IN* for an
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input parameter; select *OUT* for an output parameter; select *INOUT* for both
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an input and an output parameter; or, select *VARIADIC* to specify a VARIADIC
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parameter.
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* Write a name for the argument in the *Argument Name* field.
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* Specify a default value for the argument in the *Default Value* field.
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Click *Add* to define another argument; to discard an argument, click the trash
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icon to the left of the row and confirm deletion in the *Delete Row* popup.
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Click the *Parameters* tab to continue.
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.. image:: images/procedure_parameters.png
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:alt: Procedure dialog parameters tab
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:align: center
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Use the fields in the *Parameters* tab to specify settings that will be applied
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when the procedure is invoked:
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* Use the drop-down listbox next to *Parameter Name* in the *Parameters* panel
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to select a parameter.
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* Click the *Add* button to add the variable to *Name* field in the table.
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* Use the *Value* field to specify the value that will be associated with the
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selected variable. This field is context-sensitive.
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Click the *Security* tab to continue.
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.. image:: images/procedure_security.png
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:alt: Procedure 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 execute privileges for the procedure to a
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role:
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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 *Add* to assign additional privileges; to discard a privilege, click the
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trash icon to the left of the row and confirm deletion in the *Delete Row*
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popup.
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Use the *Security Labels* panel to define security labels applied to the
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procedure. Click *Add* 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 *Add* to assign additional security labels; to discard a security label,
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click the trash icon to the left of the row and confirm deletion in the *Delete
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Row* popup.
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Click the *SQL* tab to continue.
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Your entries in the *Procedure* 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 selections made in
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the *Procedure* dialog:
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.. image:: images/procedure_sql.png
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:alt: Procedure dialog sql tab
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:align: center
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The example demonstrates creating a procedure that returns a list of employees
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from a table named *emp*. The procedure is a SECURITY DEFINER, and will execute
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with the privileges of the role that defined the procedure.
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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 *Cancel* button to exit without saving work.
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* Click the *Reset* button to restore configuration parameters.
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