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75 lines
2.9 KiB
C
75 lines
2.9 KiB
C
/*-------------------------------------------------------------------------
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*
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* spi_priv.h
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* Server Programming Interface private declarations
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*
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* Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/executor/spi_priv.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef SPI_PRIV_H
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#define SPI_PRIV_H
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#include "executor/spi.h"
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#define _SPI_PLAN_MAGIC 569278163
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typedef struct
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{
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/* current results */
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uint32 processed; /* by Executor */
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Oid lastoid;
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SPITupleTable *tuptable;
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MemoryContext procCxt; /* procedure context */
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MemoryContext execCxt; /* executor context */
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MemoryContext savedcxt; /* context of SPI_connect's caller */
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SubTransactionId connectSubid; /* ID of connecting subtransaction */
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} _SPI_connection;
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/*
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* SPI plans have two states: saved or unsaved.
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*
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* For an unsaved plan, the _SPI_plan struct and all its subsidiary data are in
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* a dedicated memory context identified by plancxt. An unsaved plan is good
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* at most for the current transaction, since the locks that protect it from
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* schema changes will be lost at end of transaction. Hence the plancxt is
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* always a transient one.
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*
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* For a saved plan, the _SPI_plan struct and the argument type array are in
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* the plancxt (which can be really small). All the other subsidiary state
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* is in plancache entries identified by plancache_list (note: the list cells
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* themselves are in plancxt). We rely on plancache.c to keep the cache
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* entries up-to-date as needed. The plancxt is a child of CacheMemoryContext
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* since it should persist until explicitly destroyed.
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*
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* To avoid redundant coding, the representation of unsaved plans matches
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* that of saved plans, ie, plancache_list is a list of CachedPlanSource
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* structs which in turn point to CachedPlan structs. However, in an unsaved
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* plan all these structs are just created by spi.c and are not known to
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* plancache.c. We don't try very hard to make all their fields valid,
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* only the ones spi.c actually uses.
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*
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* Note: if the original query string contained only whitespace and comments,
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* the plancache_list will be NIL and so there is no place to store the
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* query string. We don't care about that, but we do care about the
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* argument type array, which is why it's seemingly-redundantly stored.
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*/
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typedef struct _SPI_plan
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{
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int magic; /* should equal _SPI_PLAN_MAGIC */
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bool saved; /* saved or unsaved plan? */
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List *plancache_list; /* one CachedPlanSource per parsetree */
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MemoryContext plancxt; /* Context containing _SPI_plan and data */
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int cursor_options; /* Cursor options used for planning */
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int nargs; /* number of plan arguments */
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Oid *argtypes; /* Argument types (NULL if nargs is 0) */
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ParserSetupHook parserSetup; /* alternative parameter spec method */
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void *parserSetupArg;
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} _SPI_plan;
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#endif /* SPI_PRIV_H */
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