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/*
* pgeasy.c
*
*/
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <libpq-fe.h>
#include "halt.h"
#include "libpgeasy.h"
#define NUL '\0'
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
/* GLOBAL VARIABLES */
static PGconn *conn;
static PGresult *res = NULL;
#define ON_ERROR_STOP 0
#define ON_ERROR_CONTINUE 1
static int on_error_state = ON_ERROR_STOP;
static int in_result_block = FALSE;
static int was_get_unset_result = FALSE;
/* LOCAL VARIABLES */
static int tuple;
/*
**
** connectdb - returns PGconn structure
**
*/
PGconn *
connectdb(char *pghost,
char *pgport,
char *pgoptions,
char *pgtty,
char *dbName)
{
/* make a connection to the database */
conn = PQsetdb(pghost, pgport, pgoptions, pgtty, dbName);
if (PQstatus(conn) == CONNECTION_BAD)
halt("Connection to database '%s' failed.\n%s\n", dbName,
PQerrorMessage(conn));
return conn;
}
/*
**
** disconnectdb
**
*/
void
disconnectdb()
{
PQfinish(conn);
}
/*
**
** doquery - returns PGresult structure
**
*/
PGresult *
doquery(char *query)
{
if (res != NULL && in_result_block == FALSE && was_get_unset_result == FALSE)
PQclear(res);
was_get_unset_result = FALSE;
res = PQexec(conn, query);
if (on_error_state == ON_ERROR_STOP &&
(res == NULL ||
PQresultStatus(res) == PGRES_BAD_RESPONSE ||
PQresultStatus(res) == PGRES_NONFATAL_ERROR ||
PQresultStatus(res) == PGRES_FATAL_ERROR))
{
if (res != NULL)
fprintf(stderr, "query error: %s\n", PQcmdStatus(res));
else
fprintf(stderr, "connection error: %s\n", PQerrorMessage(conn));
PQfinish(conn);
halt("failed request: %s\n", query);
}
tuple = 0;
return res;
}
/*
**
** fetch - returns tuple number (starts at 0), or the value END_OF_TUPLES
** NULL pointers are skipped
**
*/
int
fetch(void *param,...)
{
va_list ap;
int arg,
num_fields;
num_fields = PQnfields(res);
if (tuple >= PQntuples(res))
return END_OF_TUPLES;
va_start(ap, param);
for (arg = 0; arg < num_fields; arg++)
{
if (param != NULL)
{
if (PQfsize(res, arg) == -1)
{
memcpy(param, PQgetvalue(res, tuple, arg), PQgetlength(res, tuple, arg));
((char *) param)[PQgetlength(res, tuple, arg)] = NUL;
}
else
memcpy(param, PQgetvalue(res, tuple, arg), PQfsize(res, arg));
}
param = va_arg(ap, char *);
}
va_end(ap);
return tuple++;
}
/*
**
** fetchwithnulls - returns tuple number (starts at 0),
** or the value END_OF_TUPLES
** Returns TRUE or FALSE into null indicator variables
** NULL pointers are skipped
*/
int
fetchwithnulls(void *param,...)
{
va_list ap;
int arg,
num_fields;
num_fields = PQnfields(res);
if (tuple >= PQntuples(res))
return END_OF_TUPLES;
va_start(ap, param);
for (arg = 0; arg < num_fields; arg++)
{
if (param != NULL)
{
if (PQfsize(res, arg) == -1)
{
memcpy(param, PQgetvalue(res, tuple, arg), PQgetlength(res, tuple, arg));
((char *) param)[PQgetlength(res, tuple, arg)] = NUL;
}
else
memcpy(param, PQgetvalue(res, tuple, arg), PQfsize(res, arg));
}
param = va_arg(ap, char *);
if (PQgetisnull(res, tuple, arg) != 0)
*(int *) param = 1;
else
*(int *) param = 0;
param = va_arg(ap, char *);
}
va_end(ap);
return tuple++;
}
/*
**
** on_error_stop
**
*/
void
on_error_stop()
{
on_error_state = ON_ERROR_STOP;
}
/*
**
** on_error_continue
**
*/
void
on_error_continue()
{
on_error_state = ON_ERROR_CONTINUE;
}
/*
**
** get_result
**
*/
PGresult *
get_result()
{
char *cmdstatus = PQcmdStatus(res);
was_get_unset_result = TRUE;
/* we have to store the fetch location somewhere */
/* XXX THIS IS A NO-NO */
cmdstatus[0] = NUL;
memcpy(&cmdstatus[1], &tuple, sizeof(tuple));
return res;
}
/*
**
** set_result
**
*/
void
set_result(PGresult *newres)
{
char *cmdstatus = PQcmdStatus(res);
if (newres == NULL)
halt("set_result called with null result pointer\n");
if (res != NULL && was_get_unset_result == FALSE)
{
if (in_result_block == FALSE)
PQclear(res);
else
{
/* XXX THIS IS A NO-NO */
cmdstatus[0] = NUL;
memcpy(&cmdstatus[1], &tuple, sizeof(tuple));
}
}
in_result_block = TRUE;
was_get_unset_result = FALSE;
cmdstatus = PQcmdStatus(newres);
memcpy(&tuple, &cmdstatus[1], sizeof(tuple));
res = newres;
}
/*
**
** unset_result
**
*/
void
unset_result(PGresult *oldres)
{
char *cmdstatus = PQcmdStatus(oldres);
if (oldres == NULL)
halt("unset_result called with null result pointer\n");
if (in_result_block == FALSE)
halt("Unset of result without being set.\n");
was_get_unset_result = TRUE;
/* XXX THIS IS A NO-NO */
cmdstatus[0] = NUL;
memcpy(&cmdstatus[1], &tuple, sizeof(tuple));
in_result_block = FALSE;
}
/*
**
** reset_fetch
**
*/
void
reset_fetch()
{
tuple = 0;
}
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