The Rowset itself is usually less interesting than the Rows that it contains. This section illustrates how to get the Rows that comprise the Rowset.
A legitimate query returns zero rows when no rows in the database match the query
conditions. Therefore, a Rowset object might contain zero Row objects. Since
Zend_Db_Table_Rowset_Abstract implements the
Countable interface, you can use count()
to determine the number of Rows in the Rowset.
Example 314. Counting the Rows in a Rowset
<?php
$rowset = $bugs->fetchAll("bug_status = 'FIXED'");
$rowCount = count($rowset);
if ($rowCount > 0) {
echo "found $rowCount rows";
} else {
echo 'no rows matched the query';
}
Example 315. Reading a Single Row from a Rowset
The simplest way to access a Row from a Rowset is to use the
current() method. This is particularly appropriate when the
Rowset contains exactly one Row.
<?php
$bugs = new Bugs();
$rowset = $bugs->fetchAll("bug_id = 1");
$row = $rowset->current();
If the Rowset contains zero rows, current() returns
PHP's NULL value.
Example 316. Iterating through a Rowset
Objects descending from Zend_Db_Table_Rowset_Abstract
implement the SeekableIterator interface, which means you can
loop through them using the foreach() construct. Each value
you retrieve this way is a Zend_Db_Table_Row_Abstract object
that corresponds to one record from the table.
<?php
$bugs = new Bugs();
// fetch all records from the table
$rowset = $bugs->fetchAll();
foreach ($rowset as $row) {
// output 'Zend_Db_Table_Row' or similar
echo get_class($row) . "\n";
// read a column in the row
$status = $row->bug_status;
// modify a column in the current row
$row->assigned_to = 'mmouse';
// write the change to the database
$row->save();
}
Example 317. Seeking to a known position into a Rowset
SeekableIterator allows you to seek to a position that you
would like the iterator to jump to. Simply use the seek()
method for that. Pass it an integer representing the number of the Row you would
like your Rowset to point to next, don't forget that it starts with index 0. If the
index is wrong, ie doesn't exist, an exception will be thrown. You should use
count() to check the number of results before seeking to a
position.
<?php
$bugs = new Bugs();
// fetch all records from the table
$rowset = $bugs->fetchAll();
// takes the iterator to the 9th element (zero is one element) :
$rowset->seek(8);
// retrieve it
$row9 = $rowset->current();
// and use it
$row9->assigned_to = 'mmouse';
$row9->save();
getRow() allows you to get a specific row in the Rowset,
knowing its position; don't forget however that positions start with index zero. The
first parameter for getRow() is an integer for the position
asked. The second optional parameter is a boolean; it tells the Rowset iterator if
it must seek to that position in the same time, or not (default is
FALSE). This method returns a
Zend_Db_Table_Row object by default. If the
position requested does not exist, an exception will be thrown. Here is an example:
<?php
$bugs = new Bugs();
// fetch all records from the table
$rowset = $bugs->fetchAll();
// retrieve the 9th element immediately:
$row9->getRow(8);
// and use it:
$row9->assigned_to = 'mmouse';
$row9->save();
After you have access to an individual Row object, you can manipulate the Row using methods described in Zend_Db_Table_Row.