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|
#!/usr/local/bin/perl
# $Id: example.newstyle,v 1.6 1998/09/27 19:12:34 mergl Exp $
######################### globals
$| = 1;
use Pg;
$dbmain = 'template1';
$dbname = 'pgperltest';
$trace = '/tmp/pgtrace.out';
$DEBUG = 0; # set this to 1 for traces
######################### the following methods will be used
# connectdb
# conndefaults
# db
# user
# port
# status
# errorMessage
# trace
# untrace
# exec
# consumeInput
# getline
# putline
# endcopy
# resultStatus
# ntuples
# nfields
# fname
# fnumber
# ftype
# fsize
# cmdStatus
# oidStatus
# cmdTuples
# getvalue
# print
# notifies
# lo_import
# lo_export
# lo_unlink
######################### the following methods will not be used
# setdb
# setdbLogin
# reset
# requestCancel
# pass
# host
# tty
# options
# socket
# backendPID
# sendQuery
# getResult
# isBusy
# getlineAsync
# putnbytes
# makeEmptyPGresult
# fmod
# getlength
# getisnull
# displayTuples
# printTuples
# lo_open
# lo_close
# lo_read
# lo_write
# lo_creat
# lo_seek
# lo_tell
######################### handles error condition
$SIG{PIPE} = sub { print "broken pipe\n" };
######################### create and connect to test database
$Option_ref = Pg::conndefaults();
($key, $val);
print "connection defaults:\n";
while (($key, $val) = each %$Option_ref) {
printf " keyword = %-12.12s val = >%s<\n", $key, $val;
}
$conn = Pg::connectdb("dbname=$dbmain");
die $conn->errorMessage unless PGRES_CONNECTION_OK eq $conn->status;
print "connected to $dbmain\n";
# do not complain when dropping $dbname
$conn->exec("DROP DATABASE $dbname");
$result = $conn->exec("CREATE DATABASE $dbname");
die $conn->errorMessage unless PGRES_COMMAND_OK eq $result->resultStatus;
print "created database $dbname\n";
$conn = Pg::connectdb("dbname=$dbname");
die $conn->errorMessage unless PGRES_CONNECTION_OK eq $conn->status;
print "connected to $dbname\n";
######################### debug, trace
if ($DEBUG) {
open(TRACE, ">$trace") || die "can not open $trace: $!";
$conn->trace(TRACE);
print "enabled tracing into $trace\n";
}
######################### check PGconn
$db = $conn->db;
print " database: $db\n";
$user = $conn->user;
print " user: $user\n";
$port = $conn->port;
print " port: $port\n";
######################### create and insert into table
$result = $conn->exec("CREATE TABLE person (id int4, name char(16))");
die $conn->errorMessage unless PGRES_COMMAND_OK eq $result->resultStatus;
print "created table, status = ", $result->cmdStatus, "\n";
for ($i = 1; $i <= 5; $i++) {
$result = $conn->exec("INSERT INTO person VALUES ($i, 'Edmund Mergl')");
die $conn->errorMessage unless PGRES_COMMAND_OK eq $result->resultStatus;
}
print "insert into table, last oid = ", $result->oidStatus, "\n";
######################### copy to stdout, getline
$result = $conn->exec("COPY person TO STDOUT");
die $conn->errorMessage unless PGRES_COPY_OUT eq $result->resultStatus;
print "copy table to STDOUT:\n";
$ret = 0;
$i = 1;
while (-1 != $ret) {
$ret = $conn->getline($string, 256);
last if $string eq "\\.";
print " ", $string, "\n";
$i ++;
}
die $conn->errorMessage unless 0 == $conn->endcopy;
######################### delete and copy from stdin, putline
$result = $conn->exec("BEGIN");
die $conn->errorMessage unless PGRES_COMMAND_OK eq $result->resultStatus;
$result = $conn->exec("DELETE FROM person");
die $conn->errorMessage unless PGRES_COMMAND_OK eq $result->resultStatus;
print "delete from table, command status = ", $result->cmdStatus, ", no. of tuples = ", $result->cmdTuples, "\n";
$result = $conn->exec("COPY person FROM STDIN");
die $conn->errorMessage unless PGRES_COPY_IN eq $result->resultStatus;
print "copy table from STDIN: ";
for ($i = 1; $i <= 5; $i++) {
# watch the tabs and do not forget the newlines
$conn->putline("$i Edmund Mergl\n");
}
$conn->putline("\\.\n");
die $conn->errorMessage unless 0 == $conn->endcopy;
$result = $conn->exec("END");
die $conn->errorMessage unless PGRES_COMMAND_OK eq $result->resultStatus;
print "ok\n";
######################### select from person, getvalue
$result = $conn->exec("SELECT * FROM person");
die $conn->errorMessage unless PGRES_TUPLES_OK eq $result->resultStatus;
print "select from table:\n";
for ($k = 0; $k < $result->nfields; $k++) {
print " field = ", $k, "\tfname = ", $result->fname($k), "\tftype = ", $result->ftype($k), "\tfsize = ", $result->fsize($k), "\tfnumber = ", $result->fnumber($result->fname($k)), "\n";
}
while (@row = $result->fetchrow) {
print " ", join(" ", @row), "\n";
}
######################### notifies
if (! defined($pid = fork)) {
die "can not fork: $!";
} elsif (! $pid) {
# I'm the child
sleep 2;
bless $conn;
$conn = Pg::connectdb("dbname=$dbname");
$result = $conn->exec("NOTIFY person");
exit;
}
$result = $conn->exec("LISTEN person");
die $conn->errorMessage unless PGRES_COMMAND_OK eq $result->resultStatus;
print "listen table: status = ", $result->cmdStatus, "\n";
while (1) {
$conn->consumeInput;
($table, $pid) = $conn->notifies;
last if $pid;
}
print "got notification: table = ", $table, " pid = ", $pid, "\n";
######################### print
$result = $conn->exec("SELECT * FROM person");
die $conn->errorMessage unless PGRES_TUPLES_OK eq $result->resultStatus;
print "select from table and print:\n";
$result->print(STDOUT, 0, 0, 0, 0, 0, 0, " ", "", "", "");
######################### lo_import, lo_export, lo_unlink
$lobject_in = '/tmp/gaga.in';
$lobject_out = '/tmp/gaga.out';
$data = "testing large objects using lo_import and lo_export";
open(FD, ">$lobject_in") or die "can not open $lobject_in";
print(FD $data);
close(FD);
$result = $conn->exec("BEGIN");
die $conn->errorMessage unless PGRES_COMMAND_OK eq $result->resultStatus;
$lobjOid = $conn->lo_import("$lobject_in") or die $conn->errorMessage;
print "importing file as large object, Oid = ", $lobjOid, "\n";
die $conn->errorMessage unless 1 == $conn->lo_export($lobjOid, "$lobject_out");
print "exporting large object as temporary file\n";
$result = $conn->exec("END");
die $conn->errorMessage unless PGRES_COMMAND_OK eq $result->resultStatus;
print "comparing imported file with exported file: ";
print "not " unless (-s "$lobject_in" == -s "$lobject_out");
print "ok\n";
die $conn->errorMessage if -1 == $conn->lo_unlink($lobjOid);
unlink $lobject_in;
unlink $lobject_out;
print "unlink large object\n";
######################### debug, untrace
if ($DEBUG) {
close(TRACE) || die "bad TRACE: $!";
$conn->untrace;
print "tracing disabled\n";
}
######################### disconnect and drop test database
$conn = Pg::connectdb("dbname=$dbmain");
die $conn->errorMessage unless PGRES_CONNECTION_OK eq $conn->status;
print "connected to $dbmain\n";
$result = $conn->exec("DROP DATABASE $dbname");
die $conn->errorMessage unless PGRES_COMMAND_OK eq $result->resultStatus;
print "drop database\n";
######################### EOF
|
