How to handle pagination queries properly with mongodb and php?

Question

Am I doing this right? I went to look at some old PHP code w/ MySQL and I\'ve managed to get it to work, however I\'m wondering if there\'s a much \"cleaner\" and \"faster\" way

Answer 1

Since the result of find()->limit()->skip() is a Mongo_Cursor you don't have to execute the actual query twice.

The following should work as well :

$skip = (int)($docs_per_page * ($page - 1));
$limit = $docs_per_page;

$query = array("loc" => array('$near' => array('lat' => $latitude, 'lon' => $longitute) ),
    "tags" => $tag, "seeking" => $this->session->userdata('gender'),
    "gender" => $this->session->userdata('seeking'));

$fields = array("username", "zipcode", "tags", "birth_date");
$cursor = $collection->find($query, $fields)->limit($limit)->skip($skip);
$total_documents = $cursor->count();
$data['result'] = $cursor;

btw I first misread your question, I thought you didn't know about limit & skip.

Answer 2

Yes you are doing right. And you can run query in one shot.

Here is a paging example:

function printStudents(pageNumber, nPerPage) {
   print("Page: " + pageNumber);
   db.students.find().skip((pageNumber-1)*nPerPage).limit(nPerPage).forEach( function(student) { print(student.name + "<p>"); } );
}

Reference: Advanced Queries - MongoDB: http://www.mongodb.org/display/DOCS/Advanced+Queries#AdvancedQueries-{{skip%28%29}}