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# $Header: /home/jesse/DBIx-SearchBuilder/history/SearchBuilder/Handle/mysql.pm,v 1.8 2001/10/12 05:27:05 jesse Exp $
package DBIx::SearchBuilder::Handle::mysql;
use strict;
use warnings;
use base qw(DBIx::SearchBuilder::Handle);
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=head1 NAME
  DBIx::SearchBuilder::Handle::mysql - A mysql specific Handle object
=head1 SYNOPSIS
=head1 DESCRIPTION
This module provides a subclass of DBIx::SearchBuilder::Handle that 
compensates for some of the idiosyncrasies of MySQL.
=head1 METHODS
=head2 Insert
Takes a table name as the first argument and assumes that the rest of the arguments are an array of key-value pairs to be inserted.
If the insert succeeds, returns the id of the insert, otherwise, returns
a Class::ReturnValue object with the error reported.
=cut
sub Insert  {
    my $self = shift;
    my $sth = $self->SUPER::Insert(@_);
    if (!$sth) {
            return ($sth);
     }
    $self->{'id'}=$self->dbh->{'mysql_insertid'};
  
    # Yay. we get to work around mysql_insertid being null some of the time :/
    unless ($self->{'id'}) {
        $self->{'id'} =  $self->FetchResult('SELECT LAST_INSERT_ID()');
    }
    warn "$self no row id returned on row creation" unless ($self->{'id'});
     
    return( $self->{'id'}); #Add Succeded. return the id
  }
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=head2 SimpleUpdateFromSelect
Customization of L<DBIx::SearchBuilder::Handle/SimpleUpdateFromSelect>.
Mysql doesn't support update with subqueries when those fetch data from
the table that is updated.
=cut
sub SimpleUpdateFromSelect {
    my ($self, $table, $values, $query, @query_binds) = @_;
    return $self->SUPER::SimpleUpdateFromSelect(
        $table, $values, $query, @query_binds
    ) unless $query =~ /\b\Q$table\E\b/i;
    my $sth = $self->SimpleQuery( $query, @query_binds );
    return $sth unless $sth;
    my (@binds, @columns);
    for my $k (sort keys %$values) {
        push @columns, $k;
        push @binds, $values->{$k};
    }
    my $update_query = "UPDATE $table SET "
        . join( ', ', map "$_ = ?", @columns )
        .' WHERE ID IN ';
    return $self->SimpleMassChangeFromSelect(
        $update_query, \@binds,
        $query, @query_binds
    );
}
sub DeleteFromSelect {
    my ($self, $table, $query, @query_binds) = @_;
    return $self->SUPER::DeleteFromSelect(
        $table, $query, @query_binds
    ) unless $query =~ /\b\Q$table\E\b/i;
    return $self->SimpleMassChangeFromSelect(
        "DELETE FROM $table WHERE id IN ", [],
        $query, @query_binds
    );
}
sub SimpleMassChangeFromSelect {
    my ($self, $update_query, $update_binds, $search, @search_binds) = @_;
    my $sth = $self->SimpleQuery( $search, @search_binds );
    return $sth unless $sth;
    # tried TEMPORARY tables, much slower than fetching and delete
    # also size of ENGINE=MEMORY is limitted by option, on disk
    # tables more slower than in memory
    my $res = 0;
    my @ids;
    while ( my $id = ($sth->fetchrow_array)[0] ) {
        push @ids, $id;
        next if @ids < 1000;
        my $q = $update_query .'('. join( ',', ('?')x@ids ) .')';
        my $sth = $self->SimpleQuery( $q, @$update_binds, splice @ids );
        return $sth unless $sth;
        $res += $sth->rows;
    }
    if ( @ids ) {
        my $q = $update_query .'('. join( ',', ('?')x@ids ) .')';
        my $sth = $self->SimpleQuery( $q, @$update_binds, splice @ids );
        return $sth unless $sth;
        $res += $sth->rows;
    }
    return $res == 0? '0E0': $res;
}
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=head2 DatabaseVersion
Returns the mysql version, trimming off any -foo identifier
=cut
sub DatabaseVersion {
    my $self = shift;
    my $v = $self->SUPER::DatabaseVersion();
   $v =~ s/\-.*$//;
   return ($v);
}
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=head2 CaseSensitive 
Returns undef, since mysql's searches are not case sensitive by default 
=cut
sub CaseSensitive {
    my $self = shift;
    return(undef);
}
sub DistinctQuery {
    my $self = shift;
    my $statementref = shift;
    my $sb = shift;
    return $self->SUPER::DistinctQuery( $statementref, $sb, @_ )
        if $sb->_OrderClause !~ /(?<!main)\./;
    if ( substr($self->DatabaseVersion, 0, 1) == 4 ) {
        local $sb->{'group_by'} = [{FIELD => 'id'}];
        my ($idx, @tmp, @specials) = (0, ());
        foreach ( @{$sb->{'order_by'}} ) {
            if ( !exists $_->{'ALIAS'} || ($_->{'ALIAS'}||'') eq "main" ) {
                push @tmp, $_; next;
            }
            push @specials,
                ((($_->{'ORDER'}||'') =~ /^des/i)?'MAX':'MIN')
                ."(". $_->{'ALIAS'} .".". $_->{'FIELD'} .")"
                ." __special_sort_$idx";
            push @tmp, { ALIAS => '', FIELD => "__special_sort_$idx", ORDER => $_->{'ORDER'} };
            $idx++;
        }
        local $sb->{'order_by'} = \@tmp;
        $$statementref = "SELECT ". join( ", ", 'main.*', @specials ) ." FROM $$statementref";
        $$statementref .= $sb->_GroupClause;
        $$statementref .= $sb->_OrderClause;
    } else {
        local $sb->{'group_by'} = [{FIELD => 'id'}];
        local $sb->{'order_by'} = [
            map {
                ($_->{'ALIAS'}||'') ne "main"
                ? { %{$_}, FIELD => ((($_->{'ORDER'}||'') =~ /^des/i)?'MAX':'MIN') ."(".$_->{FIELD}.")" }
                : $_
            }
            @{$sb->{'order_by'}}
        ];
        $$statementref = "SELECT main.* FROM $$statementref";
        $$statementref .= $sb->_GroupClause;
        $$statementref .= $sb->_OrderClause;
    }
}
sub Fields {
    my $self  = shift;
    my $table = shift;
    my $cache = \%DBIx::SearchBuilder::Handle::FIELDS_IN_TABLE;
    unless ( $cache->{ lc $table } ) {
        my $sth = $self->dbh->column_info( undef, undef, $table, '%' )
            or return ();
        my $info = $sth->fetchall_arrayref({});
        foreach my $e ( sort {$a->{'ORDINAL_POSITION'} <=> $b->{'ORDINAL_POSITION'}} @$info ) {
            push @{ $cache->{ lc $e->{'TABLE_NAME'} } ||= [] }, lc $e->{'COLUMN_NAME'};
        }
    }
    return @{ $cache->{ lc $table } || [] };
}
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=head2 SimpleDateTimeFunctions
Returns hash reference with specific date time functions of this
database for L<DBIx::SearchBuilder::Handle/DateTimeFunction>.
=cut
sub SimpleDateTimeFunctions {
    my $self = shift;
    return $self->{'_simple_date_time_functions'} ||= {
        %{ $self->SUPER::SimpleDateTimeFunctions(@_) },
        datetime   => '?',
        time       => 'TIME(?)',
        hourly     => "DATE_FORMAT(?, '%Y-%m-%d %H')",
        hour       => 'HOUR(?)',
        date       => 'DATE(?)',
        daily      => 'DATE(?)',
        day        => 'DAYOFMONTH(?)',
        dayofmonth => 'DAYOFMONTH(?)',
        monthly    => "DATE_FORMAT(?, '%Y-%m')",
        month      => 'MONTH(?)',
        annually   => 'YEAR(?)',
        year       => 'YEAR(?)',
        dayofweek  => "DAYOFWEEK(?) - 1", # 1-7, 1 - Sunday
        dayofyear  => "DAYOFYEAR(?)", # 1-366
        weekofyear => "WEEK(?)", # skip mode argument, so it can be controlled in mysql config
    };
}
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=head2 ConvertTimezoneFunction
Custom implementation of L<DBIx::SearchBuilder::Handle/ConvertTimezoneFunction>.
Use the following query to get list of timezones:
    SELECT Name FROM mysql.time_zone_name;
Read docs about keeping timezone data up to date:
    http://dev.mysql.com/doc/refman/5.5/en/time-zone-upgrades.html
=cut
sub ConvertTimezoneFunction {
    my $self = shift;
    my %args = (
        From  => 'UTC',
        To    => undef,
        Field => '',
        @_
    );
    return $args{'Field'} unless $args{From} && $args{'To'};
    return $args{'Field'} if lc $args{From} eq lc $args{'To'};
    my $dbh = $self->dbh;
    $_ = $dbh->quote( $_ ) foreach @args{'From', 'To'};
    return "CONVERT_TZ( $args{'Field'}, $args{'From'}, $args{'To'} )";
}
sub _DateTimeIntervalFunction {
    my $self = shift;
    my %args = ( From => undef, To => undef, @_ );
    return "TIMESTAMPDIFF(SECOND, $args{'From'}, $args{'To'})";
}
1;
__END__
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=head1 AUTHOR
Jesse Vincent, jesse@fsck.com
=head1 SEE ALSO
DBIx::SearchBuilder, DBIx::SearchBuilder::Handle
=cut