[Koha-patches] [PATCH] Bug 6019 : Perf enhancement : C4/SQLHelper.pm

[Chris Cormack]

From: Henri-Damien LAURENT <henridamien.laurent at biblibre.com>

Adding Memoize::Memcached and a hashref to store columns
---
 C4/SQLHelper.pm |   31 ++++++++++++++++++++++++++-----
 1 files changed, 26 insertions(+), 5 deletions(-)

diff --git a/C4/SQLHelper.pm b/C4/SQLHelper.pm
index 060b78f..2738bb9 100644
--- a/C4/SQLHelper.pm
+++ b/C4/SQLHelper.pm
@@ -27,6 +27,23 @@ use C4::Debug;
 require Exporter;
 use vars qw($VERSION @ISA @EXPORT_OK %EXPORT_TAGS);
 
+eval {
+    my $servers = C4::Context->config('memcached_servers');
+    if ($servers) {
+        require Memoize::Memcached;
+        import Memoize::Memcached qw(memoize_memcached);
+ 
+        my $memcached = {
+            servers    => [ $servers ],
+            key_prefix => C4::Context->config('memcached_namespace') || 'koha',
+        };
+
+        memoize_memcached('_get_columns', memcached => $memcached, expire_time => 600000); #cache for 10 minutes
+        memoize_memcached('GetPrimaryKeys', memcached => $memcached, expire_time => 600000); #cache for 10 minutes
+    }
+};
+
+
 BEGIN {
 	# set the version for version checking
 	$VERSION = 0.5;
@@ -44,7 +61,7 @@ BEGIN {
 }
 
 my $tablename;
-my $hash;
+my $hashref;
 
 =head1 NAME
 
@@ -231,10 +248,14 @@ With
 
 sub _get_columns($) {
 	my ($tablename)=@_;
-	my $dbh=C4::Context->dbh;
-	my $sth=$dbh->prepare_cached(qq{SHOW COLUMNS FROM $tablename });
-	$sth->execute;
-    my $columns= $sth->fetchall_hashref(qw(Field));
+    unless (exists ($hashref->{$tablename})){
+        my $dbh=C4::Context->dbh;
+        my $sth=$dbh->prepare_cached(qq{SHOW COLUMNS FROM $tablename });
+        $sth->execute;
+        my $columns= $sth->fetchall_hashref(qw(Field));
+        $hashref->{$tablename}=$columns;
+    }
+    return $hashref->{$tablename};
 }
 
 =head2 _filter_columns
-- 
1.7.1