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Introduce new extended routines for FDW and foreign server lookups

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The cache lookup routines for foreign-data wrappers and foreign servers
are extended with an extra argument to handle a set of flags.  The only
value which can be used now is to indicate if a missing object should
result in an error or not, and are designed to be extensible on need.
Those new routines are added into the existing set of user-visible
FDW APIs and documented in consequence.  They will be used for future
patches to improve the SQL interface for object addresses.

Author: Michael Paquier
Reviewed-by: Álvaro Herrera
Discussion: https://postgr.es/m/CAB7nPqSZxrSmdHK-rny7z8mi=EAFXJ5J-0RbzDw6aus=wB5azQ@mail.gmail.com
This commit is contained in:
Michael Paquier
2018-12-14 08:59:35 +09:00
parent 09568ec3d3
commit 8fb569e978
3 changed files with 78 additions and 2 deletions
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10
src/include/foreign/foreign.h
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@@ -68,11 +68,21 @@ typedef struct ForeignTable
List *options; /* ftoptions as DefElem list */
} ForeignTable;
/* Flags for GetForeignServerExtended */
#define FSV_MISSING_OK 0x01
/* Flags for GetForeignDataWrapperExtended */
#define FDW_MISSING_OK 0x01
extern ForeignServer *GetForeignServer(Oid serverid);
extern ForeignServer *GetForeignServerExtended(Oid serverid,
bits16 flags);
extern ForeignServer *GetForeignServerByName(const char *name, bool missing_ok);
extern UserMapping *GetUserMapping(Oid userid, Oid serverid);
extern ForeignDataWrapper *GetForeignDataWrapper(Oid fdwid);
extern ForeignDataWrapper *GetForeignDataWrapperExtended(Oid fdwid,
bits16 flags);
extern ForeignDataWrapper *GetForeignDataWrapperByName(const char *name,
bool missing_ok);
extern ForeignTable *GetForeignTable(Oid relid);