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275 lines
9.2 KiB
C
275 lines
9.2 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 1.8 1996/10/10 08:20:11 bryanh 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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#endif
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/* ----------------
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* include stuff common to fe and be
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* ----------------
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*/
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/* #include "libpq/libpq.h" */
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#include "libpq/pqcomm.h"
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#include "lib/dllist.h"
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typedef enum {CONNECTION_OK,
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CONNECTION_BAD} ConnStatusType;
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typedef enum {
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PGRES_EMPTY_QUERY = 0,
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PGRES_COMMAND_OK, /* a query command that doesn't return */
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/* anything 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, PGresult */
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/* contains the resulttuples */
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PGRES_COPY_OUT,
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PGRES_COPY_IN,
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PGRES_BAD_RESPONSE, /* an unexpected response was recv'd from 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* pgresStatus[];
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/*
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* POSTGRES backend dependent Constants.
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*/
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/* ERROR_MSG_LENGTH should really be the same as ELOG_MAXLEN in utils/elog.h*/
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#define ERROR_MSG_LENGTH 4096
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#define COMMAND_LENGTH 20
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#define REMARK_LENGTH 80
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#define PORTAL_NAME_LENGTH 16
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/* ----------------
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* PQArgBlock --
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* Information (pointer to array of this structure) required
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* for the PQfn() call.
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* ----------------
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*/
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typedef struct {
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int len;
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int isint;
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union {
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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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typedef struct pgresAttDesc {
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char* name; /* type name */
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Oid adtid; /* type id */
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int2 adtsize; /* type size */
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} PGresAttDesc;
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/* use char* for Attribute values,
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ASCII tuples are guaranteed to be null-terminated
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For binary tuples, the first four bytes of the value is the size,
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and the bytes afterwards are the value. The binary value is
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not guaranteed to be null-terminated. In fact, it can have embedded nulls*/
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#define NULL_LEN (-1) /* pg_result len for NULL value */
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typedef struct pgresAttValue {
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int len; /* length in bytes of the value */
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char *value; /* actual value */
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} PGresAttValue;
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typedef struct pgNotify {
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char relname[NAMEDATALEN]; /* name of relation containing data */
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int be_pid; /* process id of backend */
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} PGnotify;
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/* PGconn encapsulates a connection to the backend */
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typedef struct pg_conn{
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char *pghost; /* the machine on which the server is running */
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char *pgtty; /* tty on which the backend messages is displayed */
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char *pgport; /* the communication port with the backend */
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char *pgoptions; /* options to start the backend with */
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char *dbName; /* database name */
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ConnStatusType status;
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char errorMessage[ERROR_MSG_LENGTH];
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/* pipes for be/fe communication */
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FILE *Pfin;
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FILE *Pfout;
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FILE *Pfdebug;
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void *port; /* really a Port* */
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int asyncNotifyWaiting;
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Dllist* notifyList;
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char *pguser; /* Postgres username of user who is connected */
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} PGconn;
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#define CMDSTATUS_LEN 40
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/* PGresult encapsulates the result of a query */
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/* unlike the old libpq, we assume that queries only return in one group */
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typedef struct pg_result{
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int ntups;
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int numAttributes;
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PGresAttDesc *attDescs;
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PGresAttValue* *tuples; /* each PGresTuple is an array of PGresAttValue's */
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int tupArrSize; /* size of tuples array allocated */
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ExecStatusType resultStatus;
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char cmdStatus[CMDSTATUS_LEN]; /* cmd status from the last insert query*/
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int binary; /* binary tuple values if binary == 1, otherwise ASCII */
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PGconn* conn;
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} PGresult;
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struct _PQprintOpt {
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bool header; /* print output field headings and row count */
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bool align; /* fill align the fields */
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bool standard; /* old brain dead format */
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bool html3; /* output html tables */
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bool expanded; /* expand tables */
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bool pager; /* use pager for output if needed */
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char *fieldSep; /* field separator */
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char *tableOpt; /* insert to HTML <table ...> */
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char *caption; /* HTML <caption> */
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char **fieldName; /* null terminated array of repalcement field names */
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};
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typedef struct _PQprintOpt PQprintOpt;
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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* PQsetdb(const char* pghost, const char* pgport, const char* pgoptions,
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const char* pgtty, const char* dbName);
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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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/* close the current connection and restablish a new one with the same
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parameters */
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extern void PQreset(PGconn* conn);
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extern char* PQdb(PGconn* conn);
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extern char* PQhost(PGconn* conn);
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extern char* PQoptions(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 ConnStatusType PQstatus(PGconn* conn);
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extern char* PQerrorMessage(PGconn* conn);
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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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/* === in fe-exec.c === */
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extern PGresult* PQexec(PGconn* conn, const char* query);
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extern int PQgetline(PGconn *conn, char* string, int length);
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extern int PQendcopy(PGconn *conn);
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extern void PQputline(PGconn *conn, const char* string);
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extern ExecStatusType PQresultStatus(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 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 int2 PQfsize(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 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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extern void PQclear(PGresult* res);
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/* PQdisplayTuples() is a better version of PQprintTuples() */
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extern void PQdisplayTuples(PGresult *res,
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FILE *fp, /* where to send the output */
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int fillAlign, /* pad the fields with 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 or not*/
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int terseOutput, /* delimiter bars or not?*/
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int width /* width of column,
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if 0, use variable width */
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);
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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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extern PGnotify* PQnotifies(PGconn *conn);
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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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/* === in fe-auth.c === */
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extern MsgType fe_getauthsvc(char* PQerrormsg);
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extern void fe_setauthsvc(const char *name, char* PQerrormsg);
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extern char *fe_getauthname(char* PQerrormsg);
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/* === in fe-misc.c === */
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/* pqGets and pqPuts gets and sends strings to the file stream
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returns 0 if successful
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if debug is non-null, debugging output is sent to that stream
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*/
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extern int pqGets(char* s, int maxlen, FILE* stream, FILE* debug);
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extern int pqGetnchar(char* s, int maxlen, FILE* stream, FILE* debug);
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extern int pqPutnchar(const char* s, int maxlen, FILE* stream, FILE* debug);
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extern int pqPuts(const char* s, FILE* stream, FILE* debug );
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extern int pqGetc(FILE* stream, FILE *debug);
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/* get a n-byte integer from the stream into result */
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/* returns 0 if successful */
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extern int pqGetInt(int* result, int bytes, FILE* stream, FILE *debug );
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/* put a n-byte integer into the stream */
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/* returns 0 if successful */
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extern int pqPutInt(int n, int bytes, FILE* stream, FILE *debug );
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extern void pqFlush(FILE* stream, FILE* debug);
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/* === in fe-lobj.c === */
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int lo_open(PGconn* conn, Oid lobjId, int mode);
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int lo_close(PGconn *conn, int fd);
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int lo_read(PGconn *conn, int fd, char *buf, int len);
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int lo_write(PGconn *conn, int fd, char *buf, int len);
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int lo_lseek(PGconn *conn, int fd, int offset, int whence);
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Oid lo_creat(PGconn *conn, int mode);
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int lo_tell(PGconn *conn, int fd);
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int lo_unlink(PGconn *conn, Oid lobjId);
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Oid lo_import(PGconn *conn, char *filename);
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int lo_export(PGconn *conn, Oid lobjId, char *filename);
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/* max length of message to send */
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#define MAX_MESSAGE_LEN 8193
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/* maximum number of fields in a tuple */
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#define BYTELEN 8
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#define MAX_FIELDS 512
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/* fall back options if they are not specified by arguments or defined
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by environment variables */
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#define DefaultHost "localhost"
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#define DefaultTty ""
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#define DefaultOption ""
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typedef void *TUPLE;
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#define palloc malloc
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#define pfree free
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#if defined(PORTNAME_sparc)
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extern char *sys_errlist[];
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#define strerror(A) (sys_errlist[(A)])
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#endif /* PORTNAME_sparc */
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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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