Manual Reference Pages - ALZABO::RUNTIME::JOINCURSOR (3)
Alzabo::Runtime::JoinCursor - Cursor that returns arrays of "Alzabo::Runtime::Row" objects
my $cursor = $schema->join( tables => [ $foo, $bar ],
where => [ $foo->column(foo_id), =, 1 ] );
while ( my @rows = $cursor->next )
print $rows->select(foo), "\n";
print $rows->select(bar), "\n";
Objects in this class are used to return arrays of
Alzabo::Runtime::Row objects when requested. The cursor does not
preload objects but rather creates them on demand, which is much more
efficient. For more details on the rational please see the
RATIONALE FOR CURSORS section in
Returns the next array of
Alzabo::Runtime::Row objects or an empty
list if no more are available.
If an individual row could not be fetched, then the array may contain
some undef values. For outer joins, this is normal behavior, but
for regular joins, this probably indicates a data error.
This method fetches all the rows available from the current point
onwards. This means that if there are five set of rows that will be
returned when the object is created and you call next() twice,
calling all_rows() after it will only return three sets.
The return value is an array of array references. Each of these
references represents a single set of rows as they would be returned
from the next method.
Resets the cursor so that the next next() call will return
the first row of the set.
Returns the number of rowsets returned by the cursor so far.
Returns the next rows in a hash, where the hash keys are the table
names and the hash values are the row object. If a table has been
included in the join via an outer join, then it is only included in
the hash if there is a row for that table.
Dave Rolsky, <email@example.com>
|perl v5.20.3 ||ALZABO::RUNTIME::JOINCURSOR (3) ||2016-04-03 |
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