.. _user_mapping_dialog:

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`User Mapping Dialog`:index:
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Use the *User Mapping* dialog to define a new mapping of a user to a foreign
server.

The *User Mapping* dialog organizes the development of a user mapping through
the following dialog tabs: *General* and *Options*. The *SQL* tab displays the
SQL code generated by dialog selections.

.. image:: images/user_mapping_general.png
    :alt: User Mapping dialog general tab
    :align: center

Use the drop-down listbox in the *User* field in the *General* tab to identify
the connecting role:

* Select *CURRENT_USER* to use the name of the current role.
* Select *PUBLIC* if no other user-specific mapping is applicable.
* Select a pre-defined role name to specify the name of an existing user.

Click the *Options* tab to continue.

.. image::  images/user_mapping_options.png
    :alt: User Mapping dialog options tab
    :align: center

Use the fields in the *Options* tab to specify connection options; the accepted
option names and values are specific to the foreign data wrapper associated with
the server specified in the user mapping. Click the *Add* button to add an
option/value pair.

* Specify the option name in the *Option* field.
* Provide a corresponding value in the *Value* field.

Click *Add* to specify each additional option/value pair; to discard an option,
click the trash icon to the left of the row and confirm deletion in the *Delete
Row* popup.

Click the *SQL* tab to continue.

Your entries in the *User Mapping* dialog generate a SQL command (see an
example below). Use the *SQL* tab for review; revisit or switch tabs to make
any changes to the SQL command.

Example
*******

The following is an example of the sql command generated by user selections in
the *User Mapping* dialog:

.. image:: images/user_mapping_sql.png
    :alt: User Mapping dialog sql tab
    :align: center

The example shown demonstrates a user mapping for the *hdfs_server*. The user is
*CURRENT_USER* with a password *secret*.

* Click the *Info* button (i) to access online help.
* Click the *Save* button to save work.
* Click the *Cancel* button to exit without saving work.
* Click the *Reset* button to restore configuration parameters.


