mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-08-15 23:03:24 +02:00
00d4f2af8b
postgres_fdw tended to say "unknown error" if it tried to execute a command on an already-dead connection, because some paths in libpq just return a null PGresult for such cases. Out-of-memory might result in that, too. To fix, pass the PGconn to pgfdw_report_error, and look at its PQerrorMessage() string if we can't get anything out of the PGresult. Also, fix the transaction-exit logic to reliably drop a dead connection. It was attempting to do that already, but it assumed that only connection cache entries with xact_depth > 0 needed to be examined. The folly in that is that if we fail while issuing START TRANSACTION, we'll not have bumped xact_depth. (At least for the case I was testing, this fix masks the other problem; but it still seems like a good idea to have the PGconn fallback logic.) Per investigation of bug #9087 from Craig Lucas. Backpatch to 9.3 where this code was introduced.
77 lines
2.4 KiB
C
77 lines
2.4 KiB
C
/*-------------------------------------------------------------------------
|
|
*
|
|
* postgres_fdw.h
|
|
* Foreign-data wrapper for remote PostgreSQL servers
|
|
*
|
|
* Portions Copyright (c) 2012-2014, PostgreSQL Global Development Group
|
|
*
|
|
* IDENTIFICATION
|
|
* contrib/postgres_fdw/postgres_fdw.h
|
|
*
|
|
*-------------------------------------------------------------------------
|
|
*/
|
|
#ifndef POSTGRES_FDW_H
|
|
#define POSTGRES_FDW_H
|
|
|
|
#include "foreign/foreign.h"
|
|
#include "lib/stringinfo.h"
|
|
#include "nodes/relation.h"
|
|
#include "utils/rel.h"
|
|
|
|
#include "libpq-fe.h"
|
|
|
|
/* in postgres_fdw.c */
|
|
extern int set_transmission_modes(void);
|
|
extern void reset_transmission_modes(int nestlevel);
|
|
|
|
/* in connection.c */
|
|
extern PGconn *GetConnection(ForeignServer *server, UserMapping *user,
|
|
bool will_prep_stmt);
|
|
extern void ReleaseConnection(PGconn *conn);
|
|
extern unsigned int GetCursorNumber(PGconn *conn);
|
|
extern unsigned int GetPrepStmtNumber(PGconn *conn);
|
|
extern void pgfdw_report_error(int elevel, PGresult *res, PGconn *conn,
|
|
bool clear, const char *sql);
|
|
|
|
/* in option.c */
|
|
extern int ExtractConnectionOptions(List *defelems,
|
|
const char **keywords,
|
|
const char **values);
|
|
|
|
/* in deparse.c */
|
|
extern void classifyConditions(PlannerInfo *root,
|
|
RelOptInfo *baserel,
|
|
List **remote_conds,
|
|
List **local_conds);
|
|
extern bool is_foreign_expr(PlannerInfo *root,
|
|
RelOptInfo *baserel,
|
|
Expr *expr);
|
|
extern void deparseSelectSql(StringInfo buf,
|
|
PlannerInfo *root,
|
|
RelOptInfo *baserel,
|
|
Bitmapset *attrs_used,
|
|
List **retrieved_attrs);
|
|
extern void appendWhereClause(StringInfo buf,
|
|
PlannerInfo *root,
|
|
RelOptInfo *baserel,
|
|
List *exprs,
|
|
bool is_first,
|
|
List **params);
|
|
extern void deparseInsertSql(StringInfo buf, PlannerInfo *root,
|
|
Index rtindex, Relation rel,
|
|
List *targetAttrs, List *returningList,
|
|
List **retrieved_attrs);
|
|
extern void deparseUpdateSql(StringInfo buf, PlannerInfo *root,
|
|
Index rtindex, Relation rel,
|
|
List *targetAttrs, List *returningList,
|
|
List **retrieved_attrs);
|
|
extern void deparseDeleteSql(StringInfo buf, PlannerInfo *root,
|
|
Index rtindex, Relation rel,
|
|
List *returningList,
|
|
List **retrieved_attrs);
|
|
extern void deparseAnalyzeSizeSql(StringInfo buf, Relation rel);
|
|
extern void deparseAnalyzeSql(StringInfo buf, Relation rel,
|
|
List **retrieved_attrs);
|
|
|
|
#endif /* POSTGRES_FDW_H */
|