X-Git-Url: http://git.freeside.biz/gitweb/?p=freeside.git;a=blobdiff_plain;f=FS%2FFS%2FCursor.pm;h=faa15f9f6bd89cda31ff61053afdcc80c6d36674;hp=f3bc1e23d5d83713cbe5947707a38f4c03a37966;hb=20f03d52cc6c930f610c0b4466eeeeda54fdbb40;hpb=b8fdc26451c2ed4149d667c835f80add626dd4e1

diff --git a/FS/FS/Cursor.pm b/FS/FS/Cursor.pm
index f3bc1e23d..faa15f9f6 100644
--- a/FS/FS/Cursor.pm
+++ b/FS/FS/Cursor.pm
@@ -2,12 +2,12 @@ package FS::Cursor;
 
 use strict;
 use vars qw($DEBUG $buffer);
-use base qw( Exporter );
-use FS::Record qw(qsearch dbdef dbh);
-use Data::Dumper;
-use Scalar::Util qw(refaddr);
+use FS::Record;
+use FS::UID qw(myconnect driver_name);
+use Scalar::Util qw(refaddr blessed);
+
+$DEBUG = 2;
 
-$DEBUG = 0;
 # this might become a parameter at some point, but right now, you can
 # "local $FS::Cursor::buffer = X;"
 $buffer = 200;
@@ -29,34 +29,67 @@ while ( my $row = $search->fetch ) {
 
 =over 4
 
-=item new ARGUMENTS
+=item new ARGUMENTS [, DBH ]
 
 Constructs a cursored search.  Accepts all the same arguments as qsearch,
 and returns an FS::Cursor object to fetch the rows one at a time.
 
+DBH may be a database handle; if so, the cursor will be created on that 
+connection and have all of its transaction state. Otherwise a new connection
+will be opened for the cursor.
+
 =cut
 
 sub new {
   my $class = shift;
+  my $dbh;
+  if ( blessed($_[-1]) and $_[-1]->isa('DBI::db') ) {
+    $dbh = pop;
+  }
   my $q = FS::Record::_query(@_); # builds the statement and parameter list
 
   my $self = {
     query => $q,
     class => 'FS::' . ($q->{table} || 'Record'),
     buffer => [],
+    position => 0, # for mysql
   };
   bless $self, $class;
 
   # the class of record object to return
   $self->{class} = "FS::".($q->{table} || 'Record');
 
+  # save for later, so forked children will not destroy me when they exit
+  $self->{pid} = $$;
+
   $self->{id} = sprintf('cursor%08x', refaddr($self));
-  my $statement = "DECLARE ".$self->{id}." CURSOR FOR ".$q->{statement};
 
-  my $dbh = dbh;
+  my $statement;
+  if ( driver_name() eq 'Pg' ) {
+    if (!$dbh) {
+      $dbh = myconnect();
+      $self->{autoclean} = 1;
+    }
+    $self->{dbh} = $dbh;
+    $statement = "DECLARE ".$self->{id}." CURSOR FOR ".$q->{statement};
+  } elsif ( driver_name() eq 'mysql' ) {
+    # build a cursor from scratch
+    #
+    #
+    # there are problems doing it this way, and we don't have time to resolve
+    # them all right now...
+    #$statement = "CREATE TEMPORARY TABLE $self->{id} 
+    #  (rownum INT AUTO_INCREMENT, PRIMARY KEY (rownum))
+    #  $q->{statement}";
+
+    # one of those problems is locking, so keep everything on the main session
+    $self->{dbh} = $dbh = FS::UID::dbh();
+    $statement = $q->{statement};
+  }
+
   my $sth = $dbh->prepare($statement)
     or die $dbh->errstr;
-  my $bind = 0;
+  my $bind = 1;
   foreach my $value ( @{ $q->{value} } ) {
     my $bind_type = shift @{ $q->{bind_type} };
     $sth->bind_param($bind++, $value, $bind_type );
@@ -64,7 +97,17 @@ sub new {
 
   $sth->execute or die $sth->errstr;
 
-  $self->{fetch} = $dbh->prepare("FETCH FORWARD $buffer FROM ".$self->{id});
+  if ( driver_name() eq 'Pg' ) {
+    $self->{fetch} = $dbh->prepare("FETCH FORWARD $buffer FROM ".$self->{id});
+  } elsif ( driver_name() eq 'mysql' ) {
+    # make sure we're not holding any locks on the tables mentioned
+    # in the query
+    #$dbh->commit if driver_name() eq 'mysql';
+    #$self->{fetch} = $dbh->prepare("SELECT * FROM $self->{id} ORDER BY rownum LIMIT ?, $buffer");
+
+    # instead, fetch all the rows at once
+    $self->{buffer} = $sth->fetchall_arrayref( {} );
+  }
 
   $self;
 }
@@ -94,11 +137,29 @@ sub fetch {
 
 sub refill {
   my $self = shift;
-  my $sth = $self->{fetch};
-  $sth->execute or die $sth->errstr;
-  my $result = $self->{fetch}->fetchall_arrayref( {} );
-  $self->{buffer} = $result;
-  scalar @$result;
+  if (driver_name() eq 'Pg') {
+    my $sth = $self->{fetch};
+    $sth->bind_param(1, $self->{position}) if driver_name() eq 'mysql';
+    $sth->execute or die $sth->errstr;
+    my $result = $self->{fetch}->fetchall_arrayref( {} );
+    $self->{buffer} = $result;
+    $self->{position} += $sth->rows;
+    scalar @$result;
+  } # mysql can't be refilled, since everything is buffered from the start
+}
+
+sub DESTROY {
+  my $self = shift;
+  return if driver_name() eq 'mysql';
+
+  return unless $self->{pid} eq $$;
+  $self->{dbh}->do('CLOSE '. $self->{id})
+    or die $self->{dbh}->errstr; # clean-up the cursor in Pg
+  if ($self->{autoclean}) {
+    # the dbh was created just for this cursor, so it has no transaction 
+    # state that we care about 
+    $self->{dbh}->rollback;
+  }
 }
 
 =back
@@ -109,7 +170,8 @@ Replace all uses of qsearch with this.
 
 =head1 BUGS
 
-Doesn't support MySQL.
+Still doesn't really support MySQL, but it pretends it does, by simply
+running the query and returning records one at a time.
 
 =head1 SEE ALSO