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167 lines
6.8 KiB
ReStructuredText
167 lines
6.8 KiB
ReStructuredText
.. _foreign_table_dialog:
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*****************************
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`Foreign Table Dialog`:index:
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*****************************
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Use the *Foreign Table* dialog to define a foreign table in the current
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database. Foreign tables define the structure of an external data source that
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resides on a foreign server.
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The *Foreign Table* dialog organizes the development of a foreign table through
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the following dialog tabs: *General*, *Definition*, *Columns*, *Constraints*,
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*Options*, and *Security*. The *SQL* tab displays the SQL code generated by
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dialog selections.
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.. image:: images/foreign_table_general.png
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:alt: Foreign table dialog general tab
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:align: center
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Use the fields in the *General* tab to identify the foreign table:
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* Use the *Name* field to add a descriptive name for the foreign table. The name
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of the foreign table must be distinct from the name of any other foreign
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table, table, sequence, index, view, existing data type, or materialized view
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in the same schema. The name will be displayed in the *pgAdmin* tree control.
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* Use the drop-down listbox next to *Owner* to select the name of the role that
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will own the foreign table.
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* Select the name of the schema in which the foreign table will reside from the
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drop-down listbox in the *Schema* field.
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* Store notes about the foreign table in the *Comment* field.
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Click the *Definition* tab to continue.
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.. image:: images/foreign_table_definition.png
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:alt: Foreign table dialog definition tab
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:align: center
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Use the fields in the *Definition* tab to define the external data source:
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* Use the drop-down listbox next to *Foreign server* to select a foreign server.
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This list is populated with servers defined through the *Foreign Server*
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dialog.
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* Use the drop-down listbox next to *Inherits* to specify a parent table. The
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foreign table will inherit all of its columns. This field is optional.
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Click the *Columns* tab to continue.
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.. image:: images/foreign_table_columns.png
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:alt: Foreign table dialog columns tab
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:align: center
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Use the fields in the *Columns* tab to add columns and their attributes to
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the table. Click the *Add* icon (+) to define a column:
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* Use the *Name* field to add a descriptive name for the column.
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* Use the drop-down listbox in the *Data Type* field to select a data type for
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the column. This can include array specifiers. For more information on which
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data types are supported by PostgreSQL, refer to Chapter 8 of the core
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documentation.
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Click the *Add* icon (+) to specify each additional column; to discard a column,
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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 *Constraints* tab to continue.
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.. image:: images/foreign_table_constraints.png
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:alt: Foreign table dialog constraints tab
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:align: center
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Use the fields in the *Constraints* tab to apply a table constraint to the
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foreign table. Click the *Add* icon (+) to define a constraint:
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* Use the *Name* field to add a descriptive name for the constraint. If the
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constraint is violated, the constraint name is present in error messages, so
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constraint names like *col must be positive* can be used to communicate
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helpful information.
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* Use the *Check* field to write a check expression producing a Boolean result.
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Each row in the foreign table is expected to satisfy the check expression.
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* Check the *No Inherit* checkbox to specify that the constraint will not
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propagate to child tables.
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* Uncheck the *Validate* checkbox to disable validation. The database will not
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assume that the constraint holds for all rows in the table.
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Click the *Add* icon (+) to specify each additional constraint; to discard a
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constraint, click the trash icon to the left of the row and confirm deletion in
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he *Delete Row* popup.
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Click the *Options* tab to continue.
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.. image:: images/foreign_table_options.png
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:alt: Foreign table dialog options tab
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:align: center
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Use the fields in the *Options* tab to specify options to be associated with
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the new foreign table or one of its columns; the accepted option names and
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values are specific to the foreign data wrapper associated with the foreign
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server. Click the *Add* icon (+) to add an option/value pair.
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* Specify the option name in the *Option* field. Duplicate option names are not
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allowed.
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* Provide a corresponding value in the *Value* field.
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Click the *Add* icon (+) to specify each additional option/value pair; to
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discard an option, click the trash icon to the left of the row and confirm
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deletion in the *Delete Row* popup.
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Click the *Security* tab to continue.
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.. image:: images/foreign_table_security.png
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:alt: Foreign table 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 to which privileges will be assigned from the
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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 *Foreign Table* dialog generate a SQL command (see an
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example below). Use the *SQL* tab for review; revisit or switch tabs to make
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any changes 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 *Foreign Table* dialog:
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.. image:: images/foreign_table_sql.png
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:alt: Foreign table dialog sql tab
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:align: center
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The example shown demonstrates creating a foreign table *weblogs* with multiple
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columns.
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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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