From: Brandon L. Black <blblack@gmail.com>
Date: Tue, 3 Oct 2006 22:57:09 +0000 (+0000)
Subject: add connect_info option to disable statement caching
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=b33697ef204738fc1bb8edd81bc6eb2e7bd2b5a2;p=dbsrgits%2FDBIx-Class-Historic.git

add connect_info option to disable statement caching
---

diff --git a/lib/DBIx/Class/Storage/DBI.pm b/lib/DBIx/Class/Storage/DBI.pm
index edeb8d0..a0a34a8 100644
--- a/lib/DBIx/Class/Storage/DBI.pm
+++ b/lib/DBIx/Class/Storage/DBI.pm
@@ -14,7 +14,7 @@ use IO::File;
 __PACKAGE__->mk_group_accessors(
   'simple' =>
     qw/_connect_info _dbh _sql_maker _sql_maker_opts _conn_pid _conn_tid
-       cursor on_connect_do transaction_depth/
+       disable_sth_caching cursor on_connect_do transaction_depth/
 );
 
 BEGIN {
@@ -336,6 +336,11 @@ This can be set to an arrayref of literal sql statements, which will
 be executed immediately after making the connection to the database
 every time we [re-]connect.
 
+=item disable_sth_caching
+
+If set to a true value, this option will disable the caching of
+statement handles via L<DBI/prepare_cached>.
+
 =item limit_dialect 
 
 Sets the limit dialect. This is useful for JDBC-bridge among others
@@ -413,6 +418,7 @@ Examples:
           quote_char => q{`},
           name_sep => q{@},
           on_connect_do => ['SET search_path TO myschema,otherschema,public'],
+          disable_sth_caching => 1,
       },
     ]
   );
@@ -432,8 +438,10 @@ sub connect_info {
   my $info = [ @$info_arg ]; # copy because we can alter it
   my $last_info = $info->[-1];
   if(ref $last_info eq 'HASH') {
-    if(my $on_connect_do = delete $last_info->{on_connect_do}) {
-      $self->on_connect_do($on_connect_do);
+    for my $storage_opt (qw/on_connect_do disable_sth_caching/) {
+      if(my $value = delete $last_info->{$storage_opt}) {
+        $self->$storage_opt($value);
+      }
     }
     for my $sql_maker_opt (qw/limit_dialect quote_char name_sep/) {
       if(my $opt_val = delete $last_info->{$sql_maker_opt}) {
@@ -969,11 +977,17 @@ Returns a L<DBI> sth (statement handle) for the supplied SQL.
 
 sub _dbh_sth {
   my ($self, $dbh, $sql) = @_;
+
   # 3 is the if_active parameter which avoids active sth re-use
-  $dbh->prepare_cached($sql, {}, 3) or
-    $self->throw_exception(
-      'no sth generated via sql (' . ($@ || $dbh->errstr) . "): $sql"
-    );
+  my $sth = $self->disable_sth_caching
+    ? $dbh->prepare($sql)
+    : $dbh->prepare_cached($sql, {}, 3);
+
+  $self->throw_exception(
+    'no sth generated via sql (' . ($@ || $dbh->errstr) . "): $sql"
+  ) if !$sth;
+
+  $sth;
 }
 
 sub sth {
diff --git a/lib/DBIx/Class/Storage/DBI/NoBindVars.pm b/lib/DBIx/Class/Storage/DBI/NoBindVars.pm
index 2ab0799..b965053 100644
--- a/lib/DBIx/Class/Storage/DBI/NoBindVars.pm
+++ b/lib/DBIx/Class/Storage/DBI/NoBindVars.pm
@@ -17,15 +17,17 @@ well, as is the case with L<DBD::Sybase>
 
 =head1 METHODS
 
-=head2 sth
+=head2 connect_info
 
-Uses C<prepare> instead of the usual C<prepare_cached>, seeing as we can't cache very effectively without bind variables.
+We can't cache very effectively without bind variables, so force the C<disable_sth_caching> setting to be turned on when the connect info is set.
 
 =cut
 
-sub _dbh_sth {
-  my ($self, $dbh, $sql) = @_;
-  $dbh->prepare($sql);
+sub connect_info {
+    my $self = shift;
+    my $retval = shift->next::method(@_);
+    $self->disable_sth_caching(1);
+    $retval;
 }
 
 =head2 _prep_for_execute
diff --git a/t/35disable_sth_caching.t b/t/35disable_sth_caching.t
new file mode 100644
index 0000000..5ad4cca
--- /dev/null
+++ b/t/35disable_sth_caching.t
@@ -0,0 +1,19 @@
+use strict;
+use warnings;  
+
+use Test::More;
+use lib qw(t/lib);
+use DBICTest;
+
+plan tests => 2;
+
+# Set up the "usual" sqlite for DBICTest
+my $schema = DBICTest->init_schema;
+
+my $sth_one = $schema->storage->sth('SELECT 42');
+my $sth_two = $schema->storage->sth('SELECT 42');
+$schema->storage->disable_sth_caching(1);
+my $sth_three = $schema->storage->sth('SELECT 42');
+
+ok($sth_one == $sth_two, "statement caching works");
+ok($sth_two != $sth_three, "disabling statement caching works");