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v5.0

Documentation:v5.0

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PG_FOREIGN_DATA_WRAPPER

PG_FOREIGN_DATA_WRAPPER records foreign-data wrapper definitions. A foreign-data wrapper is the mechanism by which external data, residing on foreign servers, is accessed.

Table 1 PG_FOREIGN_DATA_WRAPPER columns

Name Type Reference Description
oid oid - Row identifier (hidden attribute, which must be specified)
fdwname name - Name of a foreign-data wrapper
fdwowner oid PG_AUTHID.oid Owner of the foreign-data wrapper
fdwhandler oid PG_PROC.oid References a handler function that is responsible for supplying execution routines for the foreign-data wrapper (0 if no handler is provided)
fdwvalidator oid PG_PROC.oid References a validator function that is responsible for checking the validity of the options given to the foreign-data wrapper, as well as options for foreign servers and user mappings using the foreign-data wrapper. The value is 0 if no validator is provided.
fdwacl aclitem[] - Access permissions.
fdwoptions text[] - Foreign-data wrapper specific option, expressed in a string in the format of keyword=value
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