need to test if sql query was successful

Question

I have this query and if it returns successful, I want another function to process, if not, do not process that function.

Here is the code for running the query

Answer 1

This is the simplest way you could test

$query = $DB->query("UPDATE exp_members SET group_id = '$group_id' WHERE member_id = '$member_id'");

if($query) // will return true if succefull else it will return false
{
// code here
}

Answer 2

if ($DB->query(...)) { success }
else { failure }

query should return false on failure (if you're using mysql_query or $mysqli->query). If you want to test if the UPDATE query actually did anything (which is a totally different thing than "successful") then use mysql_affected_rows or $mysqli->affected_rows

Answer 3

This has proven the safest mechanism for me to test for failure on insert or update:

$result = $db->query(' ... ');
if ((gettype($result) == "object" && $result->num_rows == 0) || !$result) {
   failure 
}

Answer 4

global $DB;
$status = $DB->query("UPDATE exp_members SET group_id = '$group_id' WHERE member_id = '$member_id'");

if($status == false)
{ 
    die("Didn't Update"); 
}

If you are using mysql_query in the backend (whatever $DB->query() uses to query the database), it will return a TRUE or FALSE for INSERT, UPDATE, and DELETE (and a few others), commands, based on their status.

Answer 5

if you're not using the -> format, you can do this:

$a = "SQL command...";
if ($b = mysqli_query($con,$a)) {
  // results was successful
} else {
  // result was not successful
}

Answer 6

if the value is 0 then it wasn't successful, but if 1 then successful.

$this->db->affected_rows();