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/*-------------------------------------------------------------------------
*
* foreign.h
* support for foreign-data wrappers, servers and user mappings.
*
*
* Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
*
* src/include/foreign/foreign.h
*
*-------------------------------------------------------------------------
*/
#ifndef FOREIGN_H
#define FOREIGN_H
#include "nodes/parsenodes.h"
/* Helper for obtaining username for user mapping */
#define MappingUserName(userid) \
(OidIsValid(userid) ? GetUserNameFromId(userid) : "public")
/*
* Generic option types for validation.
* NB! Thes are treated as flags, so use only powers of two here.
*/
typedef enum
{
ServerOpt = 1, /* options applicable to SERVER */
UserMappingOpt = 2, /* options for USER MAPPING */
FdwOpt = 4 /* options for FOREIGN DATA WRAPPER */
} GenericOptionFlags;
typedef struct ForeignDataWrapper
{
Oid fdwid; /* FDW Oid */
Oid owner; /* FDW owner user Oid */
char *fdwname; /* Name of the FDW */
Oid fdwhandler; /* Oid of handler function, or 0 */
Oid fdwvalidator; /* Oid of validator function, or 0 */
List *options; /* fdwoptions as DefElem list */
} ForeignDataWrapper;
typedef struct ForeignServer
{
Oid serverid; /* server Oid */
Oid fdwid; /* foreign-data wrapper */
Oid owner; /* server owner user Oid */
char *servername; /* name of the server */
char *servertype; /* server type, optional */
char *serverversion; /* server version, optional */
List *options; /* srvoptions as DefElem list */
} ForeignServer;
typedef struct UserMapping
{
Oid userid; /* local user Oid */
Oid serverid; /* server Oid */
List *options; /* useoptions as DefElem list */
} UserMapping;
typedef struct ForeignTable
{
Oid relid; /* relation Oid */
Oid serverid; /* server Oid */
List *options; /* ftoptions as DefElem list */
} ForeignTable;
extern ForeignServer *GetForeignServer(Oid serverid);
extern ForeignServer *GetForeignServerByName(const char *name, bool missing_ok);
extern UserMapping *GetUserMapping(Oid userid, Oid serverid);
extern ForeignDataWrapper *GetForeignDataWrapper(Oid fdwid);
extern ForeignDataWrapper *GetForeignDataWrapperByName(const char *name,
bool missing_ok);
extern ForeignTable *GetForeignTable(Oid relid);
extern List *GetForeignColumnOptions(Oid relid, AttrNumber attnum);
extern Oid get_foreign_data_wrapper_oid(const char *fdwname, bool missing_ok);
extern Oid get_foreign_server_oid(const char *servername, bool missing_ok);
#endif /* FOREIGN_H */