php,android , echo json_encode after mysql_query failure

echo json_encode after mysql_query failure


Tag: php,android

I'm currently trying to develop an Android app that communicates with a database. I use php scripts to communicate between my app and the database.

For error handling purposes, I was wondering if I could replace the die() function in php with something simliar to json_encode so that I can send an error code to my app.

mysql_query(/*the query*/) or /* something like echo json_encode*/

EDIT: here's an example of what I usually use,

$response['error1'] = "error in select query";

$result = mysql_query("SELECT id_product FROM `product`where id_category=$id_category") or die(mysql_error());

I tried something like:

$result = mysql_query("SELECT id_product FROM `product`where id_category=$id_category") or die(echo json_encode($response));

It doesn't work and I would like to know whether there is something else I can use.

Thanks for your help.


You can use an if on the result. If mysql_query() fails it returns false:

$result = mysql_query(/*the query*/);

  //Do stuff here, the query failed
} else {
  //Query succeeded

Sidenote: mysql_* is deprecated, I highly recommend to switch to mysqli_* or PDO


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