+++ /dev/null
-#
-# Makefile
-#
-#
-TARGET = pginsert
-CFLAGS = -g -Wall -I/u/postgres95/include
-LIBS = -L/u/postgres95/lib -lpq
-
-$(TARGET) : pginsert.o pginterface.o halt.o
- $(CC) -o $(TARGET) $(XFLAGS) $(CFLAGS) \
- pginsert.o pginterface.o halt.o $(LIBS)
-
-clean:
- rm -f *.o $(TARGET) log core
-
-install:
- make clean
- make CFLAGS=-O
- install -s -o bin -g bin $(TARGET) /usr/local/bin
+++ /dev/null
-
-
- Pginterface 1.0
-
-Attached is a copy of the Postgres support routines I wrote to allow me
-to more cleanly interface to the libpg library, more like a 4gl SQL
-interface.
-
-It has several features that may be useful for others:
-
-I have simplified the C code that calls libpq by wrapping all the
-functionality of libpq in calls to connectdb(), doquery(), fetch(), and
-disconnectdb(). Each call returns a structure or value, so if you need
-to do more work with the result, you can. Also, I have a global
-variable that allows you to disable the error checking I have added to
-the doquery() routine.
-
-I have added a function called fetch(), which allows you to pass
-pointers as parameters, and on return the variables are filled with the
-data from the binary cursor you opened. These binary cursors are not
-useful if you are running the query engine on a system with a different
-architecture than the database server. If you pass a NULL pointer, the
-column is skipped, and you can use libpq to handle it as you wish.
-
-I have used sigprocmask() to block the reception of certain signals
-while the program is executing SQL queries. This prevents a user
-pressing Control-C from stopping all the back ends. It blocks SIGHUP,
-SIGINT, and SIGTERM, but does not block SIGQUIT or obviously kill -9.
-If your platform does not support sigprocmask(), you can remove those
-function calls. ( Am I correct that abnormal termination can cause
-shared memory resynchronization?)
-
-There is a demo program called pginsert that demonstrates how the
-library can be used.
-
-You can create a library of pginterface.c and halt.c, and just include
-pginterface.h in your source code.
-
-I am willing to maintain this if people find problems or want additional
-functionality.
-
-Bruce Momjian (root@candle.pha.pa.us)
+++ /dev/null
-/*
-**
-** halt.c
-**
-** This is used to print out error messages and exit
-*/
-
-#include <varargs.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <errno.h>
-
-
-/*-------------------------------------------------------------------------
-**
-** halt - print error message, and call clean up routine or exit
-**
-**------------------------------------------------------------------------*/
-
-/*VARARGS*/
-void halt(va_alist)
-va_dcl
-{
- va_list arg_ptr;
- char *format, *pstr;
- void (*sig_func)();
-
- va_start(arg_ptr);
- format = va_arg(arg_ptr,char *);
- if (strncmp(format,"PERROR", 6) != 0)
- vfprintf(stderr,format,arg_ptr);
- else
- {
- for (pstr=format+6; *pstr == ' ' || *pstr == ':'; pstr++)
- ;
- vfprintf(stderr,pstr,arg_ptr);
- perror("");
- }
- va_end(arg_ptr);
- fflush(stderr);
-
- /* call one clean up function if defined */
- if ( (sig_func = signal(SIGTERM, SIG_DFL)) != SIG_DFL &&
- sig_func != SIG_IGN)
- (*sig_func)(0);
- else if ( (sig_func = signal(SIGHUP, SIG_DFL)) != SIG_DFL &&
- sig_func != SIG_IGN)
- (*sig_func)(0);
- else if ( (sig_func = signal(SIGINT, SIG_DFL)) != SIG_DFL &&
- sig_func != SIG_IGN)
- (*sig_func)(0);
- else if ( (sig_func = signal(SIGQUIT, SIG_DFL)) != SIG_DFL &&
- sig_func != SIG_IGN)
- (*sig_func)(0);
- exit(1);
-}
+++ /dev/null
-/*
-** halt.h
-**
-*/
-
-void halt();
-
+++ /dev/null
-/*
- * insert.c
- *
-*/
-
-#include <stdio.h>
-#include <signal.h>
-#include <time.h>
-#include "halt.h"
-#include <libpq-fe.h>
-#include "pginterface.h"
-
-int main(int argc, char **argv)
-{
- char query[4000];
- int row =1;
- int aint;
- float afloat;
- double adouble;
- char achar[11], achar16[17], abpchar[11], avarchar[51], atext[51];
- time_t aabstime;
-
- if (argc != 2)
- halt("Usage: %s database\n",argv[0]);
-
- connectdb(argv[1],NULL,NULL,NULL,NULL);
-
- on_error_continue();
- doquery("DROP TABLE testfetch");
- on_error_stop();
-
- doquery("\
- CREATE TABLE testfetch( \
- aint int4, \
- afloat float4, \
- adouble float8, \
- achar char, \
- achar16 char16, \
- abpchar char(10), \
- avarchar varchar(50), \
- atext text, \
- aabstime abstime) \
- ");
-
- while(1)
- {
- sprintf(query,"INSERT INTO testfetch VALUES ( \
- %d, \
- 2322.12, \
- '923121.0323'::float8, \
- 'A', \
- 'Betty', \
- 'Charley', \
- 'Doug', \
- 'Ernie', \
- 'now' )", row);
- doquery(query);
-
- doquery("BEGIN WORK");
- doquery("DECLARE c_testfetch BINARY CURSOR FOR \
- SELECT * FROM testfetch");
-
- doquery("FETCH ALL IN c_testfetch");
-
- while (fetch(
- &aint,
- &afloat,
- &adouble,
- achar,
- achar16,
- abpchar,
- avarchar,
- atext,
- &aabstime) != END_OF_TUPLES)
- printf("int %d\nfloat %f\ndouble %f\nchar %s\nchar16 %s\n\
-bpchar %s\nvarchar %s\ntext %s\nabstime %s",
- aint,
- afloat,
- adouble,
- achar,
- achar16,
- abpchar,
- avarchar,
- atext,
- ctime(&aabstime));
-
-
- doquery("CLOSE c_testfetch");
- doquery("COMMIT WORK");
- printf("--- %-d rows inserted so far\n",row);
-
- row++;
- }
-
- disconnectdb();
- return 0;
-}
-
+++ /dev/null
-/*
- * pginterface.c
- *
-*/
-
-#include <stdio.h>
-#include <signal.h>
-#include <string.h>
-#include <stdarg.h>
-
-#include "halt.h"
-#include <libpq-fe.h>
-#include "pginterface.h"
-
-static void sig_disconnect();
-static void set_signals();
-
-#define NUL '\0'
-
-/* 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;
-
-/* LOCAL VARIABLES */
-static sigset_t block_sigs, unblock_sigs;
-static int tuple;
-
-/*
-**
-** connectdb - returns PGconn structure
-**
-*/
-PGconn *connectdb( char *dbName,
- char *pghost,
- char *pgport,
- char *pgoptions,
- char *pgtty)
-{
- /* 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));
- set_signals();
- return conn;
-}
-
-/*
-**
-** disconnectdb
-**
-*/
-void disconnectdb()
-{
- PQfinish(conn);
-}
-
-/*
-**
-** doquery - returns PGresult structure
-**
-*/
-PGresult *doquery(char *query)
-{
- if (res != NULL)
- PQclear(res);
-
- sigprocmask(SIG_SETMASK,&block_sigs,NULL);
- res = PQexec(conn, query);
- sigprocmask(SIG_SETMASK,&unblock_sigs,NULL);
-
- 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_args;
-
- num_args = PQnfields(res);
-
- if (tuple >= PQntuples(res))
- return END_OF_TUPLES;
- va_start(ap, param);
- for (arg = 0; arg < num_args; 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++;
-}
-
-/*
-**
-** 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;
-}
-
-/*
-**
-** sig_disconnect
-**
-*/
-static void sig_disconnect()
-{
- fprintf(stderr,"exiting...\n");
- PQfinish(conn);
- exit(1);
-}
-
-/*
-**
-** set_signals
-**
-*/
-static void set_signals()
-{
- sigemptyset(&block_sigs);
- sigemptyset(&unblock_sigs);
- sigaddset(&block_sigs,SIGTERM);
- sigaddset(&block_sigs,SIGHUP);
- sigaddset(&block_sigs,SIGINT);
-/* sigaddset(&block_sigs,SIGQUIT); no block */
- sigprocmask(SIG_SETMASK,&unblock_sigs,NULL);
- signal(SIGTERM,sig_disconnect);
- signal(SIGHUP,sig_disconnect);
- signal(SIGINT,sig_disconnect);
- signal(SIGQUIT,sig_disconnect);
-}
+++ /dev/null
-/*
- * pglib.h
- *
-*/
-
-PGresult *doquery(char *query);
-PGconn *connectdb();
-void disconnectdb();
-int fetch(void *param, ...);
-void on_error_continue();
-void on_error_stop();
-
-#define END_OF_TUPLES (-1)
projects / postgresql / commitdiff