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|
package DBIEasy::postgresql;
use strict;
use warnings;
use Data::Dumper;
use base 'DBIEasy';
my $queryTimeout = 300;
sub getDSN {
my $self = shift;
return (
'DBI:Pg:' .
'database=' . $self->dbname .
';host=' . $self->dbhost,
$self->dbuser, $self->dbpass
);
}
sub checkIfTableExists {
my $self = shift;
my $dbh = $self->dbh;
my $table = lc($self->TABLE);
my @tables = $dbh->tables(undef, undef, $table);
unless (grep {/^("?[^\.\s]+"?.)?"?$table"?$/} @tables) {
if ($self->SETUPTABLE) {
$self->_carp("Table '$table' doesn't exist, try to create it...\n");
my $createStmt = "CREATE TABLE `$table` (" . $self->CREATETABLE . ') ENGINE=InnoDB DEFAULT CHARSET=utf8';
$dbh->do($createStmt) or $self->_croak($dbh->errstr);
my @tables = $dbh->tables(undef, undef, $table);
unless (grep {/^(`?$self->{dbname}`?.)?`?$table`?$/} @tables) {
$self->_croak("Sorry, after creating the Table '$table', it isn't there?");
return 0;
}
} else {
$self->_croak("Table '$table' doesn't exist!");
return 0;
}
}
return 1;
}
sub getPK {
my $self = shift;
my $dbh = $self->dbh;
my $table = lc($self->TABLE);
my @PKs = ();
my $sth = $dbh->prepare(qq{
SELECT
f.attname AS pk
FROM
pg_attribute f
JOIN pg_class c ON c.oid = f.attrelid
LEFT JOIN pg_constraint p ON p.conrelid = c.oid AND f.attnum = ANY ( p.conkey )
WHERE
c.relkind = 'r'::char
AND p.contype = 'p'
AND c.relname = ?
AND f.attnum > 0
});
$sth->execute($table);
$self->_croak($dbh->errstr) if $dbh->errstr;
if ($sth) {
my $primKeys = $sth->fetchall_arrayref({});
foreach (@{$primKeys}) {
push @PKs, $_->{pk};
}
}
if ($#PKs == -1) {
$self->_croak("No Primary Keys in Table '$table'!");
} else {
return \@PKs;
}
}
sub getColoumns {
my $self = shift;
my $dbh = $self->dbh;
my $table = lc($self->TABLE);
my $sth = $dbh->prepare(qq{
SELECT
f.attname AS name
FROM
pg_attribute f
JOIN pg_class c ON c.oid = f.attrelid
WHERE
c.relkind = 'r'::char
AND c.relname = ?
AND f.attnum > 0
});
$sth->execute($table);
$self->_croak($dbh->errstr) if $dbh->errstr;
my $cols = $sth->fetchall_arrayref({});
if ($#{$cols} > -1) {
return map {$_->{name}} @{$cols};
} else {
$self->_carp("Sorry, no Columns found!");
return ();
}
}
sub checkForOldHandles {
my $self = shift;
my $dbh = shift;
my $superUser = ${$dbh->selectall_arrayref(qq{
SELECT usesuper
FROM pg_user
WHERE usename=?
}, { Slice => {} }, $self->dbuser)}[0];
# Killing old queries only makes sense if database user has superuser rights
return unless defined $superUser && $superUser->{usesuper};
my $sth_sh_proc = $dbh->prepare(q{
SELECT
EXTRACT(EPOCH FROM query_start)::integer as query_start,
procpid
FROM
pg_stat_activity
WHERE
current_query='idle in transaction'
});
my $sth_kill = $dbh->prepare("SELECT pg_cancel_backend(?)");
unless ($sth_sh_proc->execute()) {
_carp("Unable to execute show procs [" . $dbh->errstr() . "]");
return 0;
}
while (my $row = $sth_sh_proc->fetchrow_hashref()) {
my $queryAge = time - $row->{query_start};
if ($queryAge > $queryTimeout) {
my $id = $row->{procpid};
$sth_kill->execute($id);
}
}
return 1;
}
sub mkCaseSensitive {
my $self = shift;
my @whereStr = @_;
# postgresql is case sensitive by default
return @whereStr;
}
sub _log {
DBIEasy::_log(@_);
}
sub _carp {
DBIEasy::_carp(@_);
}
sub _croak {
DBIEasy::_croak(@_);
}
1;
# vim:ts=2:sts=2:sw=2
|
