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Attached is an update to contrib/dblink. Please apply if there are no

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objections.

Major changes:
   - removed cursor wrap around input sql to allow for remote
     execution of INSERT/UPDATE/DELETE
   - dblink now returns a resource id instead of a real pointer
   - added several utility functions

I'm still hoping to add explicit cursor open/fetch/close support before
7.3 is released, but I need a bit more time on that.

On a somewhat unrelated topic, I never got any feedback on the
unknownin/out patch and the mb_substring patch. Is there anything else I
need to do to get those applied?

Joe Conway
This commit is contained in:
Bruce Momjian
2002-04-24 02:28:28 +00:00
parent 30571b5496
commit 3bf6b8f06a
4 changed files with 1624 additions and 122 deletions
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79
contrib/dblink/dblink.h
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@ -3,7 +3,8 @@
*
* Functions returning results from a remote database
*
* Copyright (c) Joseph Conway <joe.conway@mail.com>, 2001;
* Copyright (c) Joseph Conway <mail@joeconway.com>, 2001, 2002,
* ALL RIGHTS RESERVED;
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose, without fee, and without a written agreement
@ -33,10 +34,31 @@
#include "libpq-int.h"
#include "fmgr.h"
#include "access/tupdesc.h"
#include "access/heapam.h"
#include "catalog/catname.h"
#include "catalog/pg_index.h"
#include "catalog/pg_type.h"
#include "executor/executor.h"
#include "executor/spi.h"
#include "lib/stringinfo.h"
#include "nodes/nodes.h"
#include "nodes/execnodes.h"
#include "nodes/pg_list.h"
#include "parser/parse_type.h"
#include "tcop/tcopprot.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
#include "utils/array.h"
#include "utils/syscache.h"
#ifdef NamespaceRelationName
#include "catalog/namespace.h"
#endif /* NamespaceRelationName */
/*
* Max SQL statement size
*/
#define DBLINK_MAX_SQLSTATE_SIZE 16384
/*
* This struct holds the results of the remote query.
@ -49,22 +71,75 @@ typedef struct
*/
int tup_num;
/*
* resource index number for this context
*/
int res_id_index;
/*
* the actual query results
*/
PGresult *res;
} dblink_results;
/*
* This struct holds results in the form of an array.
* Use fn_extra to hold a pointer to it across calls
*/
typedef struct
{
/*
* elem being accessed
*/
int elem_num;
/*
* number of elems
*/
int num_elems;
/*
* the actual array
*/
void *res;
} dblink_array_results;
/*
* External declarations
*/
extern Datum dblink(PG_FUNCTION_ARGS);
extern Datum dblink_tok(PG_FUNCTION_ARGS);
extern Datum dblink_strtok(PG_FUNCTION_ARGS);
extern Datum dblink_get_pkey(PG_FUNCTION_ARGS);
extern Datum dblink_last_oid(PG_FUNCTION_ARGS);
extern Datum dblink_build_sql_insert(PG_FUNCTION_ARGS);
extern Datum dblink_build_sql_delete(PG_FUNCTION_ARGS);
extern Datum dblink_build_sql_update(PG_FUNCTION_ARGS);
extern Datum dblink_current_query(PG_FUNCTION_ARGS);
extern Datum dblink_replace_text(PG_FUNCTION_ARGS);
/*
* Internal declarations
*/
dblink_results *init_dblink_results(MemoryContext fn_mcxt);
dblink_array_results *init_dblink_array_results(MemoryContext fn_mcxt);
char **get_pkey_attnames(Oid relid, int16 *numatts);
char *get_strtok(char *fldtext, char *fldsep, int fldnum);
char *getvalue(HeapTuple tuple, TupleDesc tupdesc, int fnumber);
char *get_sql_insert(Oid relid, int16 *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals);
char *get_sql_delete(Oid relid, int16 *pkattnums, int16 pknumatts, char **tgt_pkattvals);
char *get_sql_update(Oid relid, int16 *pkattnums, int16 pknumatts, char **src_pkattvals, char **tgt_pkattvals);
static char *quote_literal_cstr(char *rawstr);
static char *quote_ident_cstr(char *rawstr);
int16 get_attnum_pk_pos(int16 *pkattnums, int16 pknumatts, int16 key);
HeapTuple get_tuple_of_interest(Oid relid, int16 *pkattnums, int16 pknumatts, char **src_pkattvals);
Oid get_relid_from_relname(char *relname);
dblink_results *get_res_ptr(int32 res_id_index);
void append_res_ptr(dblink_results *results);
void remove_res_ptr(dblink_results *results);
extern char *debug_query_string;
#endif /* DBLINK_H */