如何在Opencart / PHP中将查询结果分配给变量？

Question

I'm having a problem trying to assign a single query result to a variable in Opencart. For example,

$variable = $this->db->query("SELECT value FROM mydb WHERE ID='example'");

From what I have read, $variable is now the result of the query in an associative array, if that is true, how can I get the string value from the associative array to be assigned to the variable? If I am wrong on anything I have said please correct me. Any help is appreciated.

Thank you!

Answer 1

Try this:

$query = $this->db->query("SELECT value FROM mydb WHERE ID='example'");

// Check if there are any rows returned from the query
if ($query->num_rows > 0) {

    // Here you are getting array of your row.
    $row = $query->row;

    // Now here you are getting specific column value from our row into your variable.
    $variable = $row['yourcolumnname'];

   // Here we are echo our variable to test it.
    echo $variable;
}