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309 lines
9.9 KiB
C
309 lines
9.9 KiB
C
/*-------------------------------------------------------------------------
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*
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* libpq-fe.h--
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* This file contains definitions for structures and
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* externs for functions used by frontend postgres applications.
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: libpq-fe.h,v 1.46 1999/02/04 03:20:39 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef LIBPQ_FE_H
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#define LIBPQ_FE_H
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#include <stdio.h>
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/* postgres_ext.h defines the backend's externally visible types,
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* such as Oid.
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*/
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#include "postgres_ext.h"
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/* Application-visible enum types */
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typedef enum
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{
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CONNECTION_OK,
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CONNECTION_BAD
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} ConnStatusType;
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typedef enum
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{
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PGRES_EMPTY_QUERY = 0,
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PGRES_COMMAND_OK, /* a query command that doesn't return anything
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* was executed properly by the backend */
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PGRES_TUPLES_OK, /* a query command that returns tuples
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* was executed properly by the backend,
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* PGresult contains the result tuples */
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PGRES_COPY_OUT, /* Copy Out data transfer in progress */
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PGRES_COPY_IN, /* Copy In data transfer in progress */
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PGRES_BAD_RESPONSE, /* an unexpected response was recv'd from
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* the backend */
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PGRES_NONFATAL_ERROR,
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PGRES_FATAL_ERROR
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} ExecStatusType;
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/* String descriptions of the ExecStatusTypes */
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extern const char * const pgresStatus[];
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/* PGconn encapsulates a connection to the backend.
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* The contents of this struct are not supposed to be known to applications.
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*/
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typedef struct pg_conn PGconn;
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/* PGresult encapsulates the result of a query (or more precisely, of a single
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* SQL command --- a query string given to PQsendQuery can contain multiple
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* commands and thus return multiple PGresult objects).
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* The contents of this struct are not supposed to be known to applications.
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*/
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typedef struct pg_result PGresult;
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/* PGnotify represents the occurrence of a NOTIFY message.
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* Ideally this would be an opaque typedef, but it's so simple that it's
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* unlikely to change.
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* NOTE: in Postgres 6.4 and later, the be_pid is the notifying backend's,
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* whereas in earlier versions it was always your own backend's PID.
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*/
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typedef struct pgNotify
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{
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char relname[NAMEDATALEN]; /* name of relation
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* containing data */
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int be_pid; /* process id of backend */
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} PGnotify;
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/* PQnoticeProcessor is the function type for the notice-message callback.
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*/
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typedef void (*PQnoticeProcessor) (void * arg, const char * message);
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/* Print options for PQprint() */
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/*
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* We can't use the conventional "bool", because we are designed to be
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* included in a user's program, and user may already have that type
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* defined. Pqbool, on the other hand, is unlikely to be used.
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*/
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typedef char pqbool;
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typedef struct _PQprintOpt
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{
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pqbool header; /* print output field headings and row
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* count */
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pqbool align; /* fill align the fields */
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pqbool standard; /* old brain dead format */
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pqbool html3; /* output html tables */
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pqbool expanded; /* expand tables */
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pqbool pager; /* use pager for output if needed */
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const char *fieldSep; /* field separator */
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const char *tableOpt; /* insert to HTML <table ...> */
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const char *caption; /* HTML <caption> */
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char **fieldName; /* null terminated array of repalcement
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* field names */
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} PQprintOpt;
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/* ----------------
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* Structure for the conninfo parameter definitions returned by PQconndefaults
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* ----------------
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*/
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typedef struct _PQconninfoOption
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{
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const char *keyword; /* The keyword of the option */
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const char *envvar; /* Fallback environment variable name */
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const char *compiled; /* Fallback compiled in default value */
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char *val; /* Options value */
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const char *label; /* Label for field in connect dialog */
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const char *dispchar; /* Character to display for this field */
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/* in a connect dialog. Values are: */
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/* "" Display entered value as is */
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/* "*" Password field - hide value */
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/* "D" Debug options - don't */
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/* create a field by default */
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int dispsize; /* Field size in characters for dialog */
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} PQconninfoOption;
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/* ----------------
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* PQArgBlock -- structure for PQfn() arguments
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* ----------------
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*/
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typedef struct
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{
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int len;
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int isint;
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union
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{
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int *ptr; /* can't use void (dec compiler barfs) */
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int integer;
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} u;
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} PQArgBlock;
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/* ----------------
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* Exported functions of libpq
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* ----------------
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*/
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/* === in fe-connect.c === */
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/* make a new client connection to the backend */
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extern PGconn *PQconnectdb(const char *conninfo);
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extern PGconn *PQsetdbLogin(const char *pghost, const char *pgport,
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const char *pgoptions, const char *pgtty,
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const char *dbName,
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const char *login, const char *pwd);
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#define PQsetdb(M_PGHOST,M_PGPORT,M_PGOPT,M_PGTTY,M_DBNAME) \
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PQsetdbLogin(M_PGHOST, M_PGPORT, M_PGOPT, M_PGTTY, M_DBNAME, NULL, NULL)
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/* get info about connection options known to PQconnectdb */
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extern PQconninfoOption *PQconndefaults(void);
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/* close the current connection and free the PGconn data structure */
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extern void PQfinish(PGconn *conn);
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/*
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* close the current connection and restablish a new one with the same
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* parameters
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*/
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extern void PQreset(PGconn *conn);
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/* issue a cancel request */
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extern int PQrequestCancel(PGconn *conn);
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/* Accessor functions for PGconn objects */
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extern char *PQdb(PGconn *conn);
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extern char *PQuser(PGconn *conn);
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extern char *PQpass(PGconn *conn);
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extern char *PQhost(PGconn *conn);
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extern char *PQport(PGconn *conn);
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extern char *PQtty(PGconn *conn);
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extern char *PQoptions(PGconn *conn);
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extern ConnStatusType PQstatus(PGconn *conn);
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extern char *PQerrorMessage(PGconn *conn);
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extern int PQsocket(PGconn *conn);
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extern int PQbackendPID(PGconn *conn);
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/* Enable/disable tracing */
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extern void PQtrace(PGconn *conn, FILE *debug_port);
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extern void PQuntrace(PGconn *conn);
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/* Override default notice processor */
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extern void PQsetNoticeProcessor(PGconn *conn,
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PQnoticeProcessor proc,
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void *arg);
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/* === in fe-exec.c === */
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/* Simple synchronous query */
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extern PGresult *PQexec(PGconn *conn, const char *query);
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extern PGnotify *PQnotifies(PGconn *conn);
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/* Interface for multiple-result or asynchronous queries */
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extern int PQsendQuery(PGconn *conn, const char *query);
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extern PGresult *PQgetResult(PGconn *conn);
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/* Routines for managing an asychronous query */
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extern int PQisBusy(PGconn *conn);
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extern int PQconsumeInput(PGconn *conn);
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/* Routines for copy in/out */
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extern int PQgetline(PGconn *conn, char *string, int length);
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extern int PQputline(PGconn *conn, const char *string);
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extern int PQgetlineAsync(PGconn *conn, char *buffer, int bufsize);
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extern int PQputnbytes(PGconn *conn, const char *buffer, int nbytes);
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extern int PQendcopy(PGconn *conn);
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/*
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* "Fast path" interface --- not really recommended for application
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* use
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*/
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extern PGresult *PQfn(PGconn *conn,
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int fnid,
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int *result_buf,
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int *result_len,
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int result_is_int,
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PQArgBlock *args,
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int nargs);
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/* Accessor functions for PGresult objects */
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extern ExecStatusType PQresultStatus(PGresult *res);
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extern const char *PQresultErrorMessage(PGresult *res);
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extern int PQntuples(PGresult *res);
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extern int PQnfields(PGresult *res);
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extern int PQbinaryTuples(PGresult *res);
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extern char *PQfname(PGresult *res, int field_num);
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extern int PQfnumber(PGresult *res, const char *field_name);
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extern Oid PQftype(PGresult *res, int field_num);
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extern int PQfsize(PGresult *res, int field_num);
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extern int PQfmod(PGresult *res, int field_num);
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extern char *PQcmdStatus(PGresult *res);
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extern const char *PQoidStatus(PGresult *res);
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extern const char *PQcmdTuples(PGresult *res);
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extern char *PQgetvalue(PGresult *res, int tup_num, int field_num);
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extern int PQgetlength(PGresult *res, int tup_num, int field_num);
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extern int PQgetisnull(PGresult *res, int tup_num, int field_num);
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/* Delete a PGresult */
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extern void PQclear(PGresult *res);
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/* Make an empty PGresult with given status (some apps find this useful).
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* If conn is not NULL and status indicates an error, the conn's
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* errorMessage is copied.
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*/
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extern PGresult * PQmakeEmptyPGresult(PGconn *conn, ExecStatusType status);
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/* === in fe-print.c === */
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extern void PQprint(FILE *fout, /* output stream */
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PGresult *res,
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PQprintOpt *ps); /* option structure */
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/*
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* PQdisplayTuples() is a better version of PQprintTuples(), but both
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* are obsoleted by PQprint().
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*/
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extern void PQdisplayTuples(PGresult *res,
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FILE *fp, /* where to send the
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* output */
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int fillAlign, /* pad the fields with
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* spaces */
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const char *fieldSep, /* field separator */
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int printHeader, /* display headers? */
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int quiet);
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extern void PQprintTuples(PGresult *res,
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FILE *fout, /* output stream */
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int printAttName, /* print attribute names
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* or not */
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int terseOutput, /* delimiter bars or
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* not? */
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int width); /* width of column, if
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* 0, use variable width */
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/* Determine length of multibyte encoded char at *s */
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extern int PQmblen(unsigned char *s);
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/* === in fe-lobj.c === */
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/* Large-object access routines */
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extern int lo_open(PGconn *conn, Oid lobjId, int mode);
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extern int lo_close(PGconn *conn, int fd);
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extern int lo_read(PGconn *conn, int fd, char *buf, int len);
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extern int lo_write(PGconn *conn, int fd, char *buf, int len);
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extern int lo_lseek(PGconn *conn, int fd, int offset, int whence);
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extern Oid lo_creat(PGconn *conn, int mode);
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extern int lo_tell(PGconn *conn, int fd);
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extern int lo_unlink(PGconn *conn, Oid lobjId);
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extern Oid lo_import(PGconn *conn, char *filename);
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extern int lo_export(PGconn *conn, Oid lobjId, char *filename);
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#ifdef __cplusplus
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};
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#endif
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#endif /* LIBPQ_FE_H */
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