Question

i am working with JSON to send data to and from my server , but normally i work with sending one data at a time , now i want to :
retrieve all the rows from a table (mysql database) –> php put it in a JSON array + callback —> javascript retrives it and display it out by looping through the data.

Here’s my javascript(jQuery):

$.getJSON(domain_path + 'generate.php?table=' +  tbname + '&callback=?', function(data) {
});

As you can see this has table= the table name. which is for php to know which table to extract the data from.

But for the php part im not sure what to use to produce a JSONP array.

<?php
//connects to database
  include 'connect.php';

$tbname = mysql_real_escape_string($_GET['table']);
$callback = $_GET['callback'];

//some mysql commands
//after mysql commands
//i would use this to output data but this is only for one line of data.

    $output = array('error'=>'0');
    $out_string =  json_encode($output);
    echo $callback.'('.$out_string.');';    

?>

Mysql table structure:
Table name : users
name , link , email

How can i get all the rows from users table which contians their name , link and email and out it into a JSON array.
And how would i display it out using javascript(jquery)?
Is it using the for function in javascript

Answer 1

Print out the JSON array in PHP:

$query = mysql_query("SELECT * FROM ".$tbname."");
$rows = array();
while($r = mysql_fetch_assoc($query)) {
   $rows[] = $r;
}
print json_encode($rows);

Catch and loop over result in jQuery:

    $.getJSON(domain_path + 'generate.php?table=' +  tbname + '&callback=?', function(data) {
         $.each(data, function() {
           $.each(this, function(k, v) {
           /// do stuff
           });
         });
    });

First each loop goes over your rows/objects; second loop goes over your attributes/columns.