greenplumn libpq-events 源码
greenplumn libpq-events 代码
文件路径：/src/interfaces/libpq/libpq-events.h
/*-------------------------------------------------------------------------
*
* libpq-events.h
* This file contains definitions that are useful to applications
* that invoke the libpq "events" API, but are not interesting to
* ordinary users of libpq.
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/interfaces/libpq/libpq-events.h
*
*-------------------------------------------------------------------------
*/
#ifndef LIBPQ_EVENTS_H
#define LIBPQ_EVENTS_H
#include "libpq-fe.h"
#ifdef __cplusplus
extern "C"
{
#endif
/* Callback Event Ids */
typedef enum
{
PGEVT_REGISTER,
PGEVT_CONNRESET,
PGEVT_CONNDESTROY,
PGEVT_RESULTCREATE,
PGEVT_RESULTCOPY,
PGEVT_RESULTDESTROY
} PGEventId;
typedef struct
{
PGconn *conn;
} PGEventRegister;
typedef struct
{
PGconn *conn;
} PGEventConnReset;
typedef struct
{
PGconn *conn;
} PGEventConnDestroy;
typedef struct
{
PGconn *conn;
PGresult *result;
} PGEventResultCreate;
typedef struct
{
const PGresult *src;
PGresult *dest;
} PGEventResultCopy;
typedef struct
{
PGresult *result;
} PGEventResultDestroy;
typedef int (*PGEventProc) (PGEventId evtId, void *evtInfo, void *passThrough);
/* Registers an event proc with the given PGconn. */
extern int PQregisterEventProc(PGconn *conn, PGEventProc proc,
const char *name, void *passThrough);
/* Sets the PGconn instance data for the provided proc to data. */
extern int PQsetInstanceData(PGconn *conn, PGEventProc proc, void *data);
/* Gets the PGconn instance data for the provided proc. */
extern void *PQinstanceData(const PGconn *conn, PGEventProc proc);
/* Sets the PGresult instance data for the provided proc to data. */
extern int PQresultSetInstanceData(PGresult *result, PGEventProc proc, void *data);
/* Gets the PGresult instance data for the provided proc. */
extern void *PQresultInstanceData(const PGresult *result, PGEventProc proc);
/* Fires RESULTCREATE events for an application-created PGresult. */
extern int PQfireResultCreateEvents(PGconn *conn, PGresult *res);
#ifdef __cplusplus
}
#endif
#endif /* LIBPQ_EVENTS_H */
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