MySQL SELECT query works in PHPmyadmin, not in PHP

Question

So, Im having a lot of trouble with executing a query in PHP. It executes well in phpmyadmin and gives me a neat list of results.

Here is the query I inserted into phpmyadmin:

SELECT RIGHT(`Pair`, LOCATE('_', REVERSE(`Pair`))-1) 
FROM `poloniex`
WHERE LEFT(`Pair`, 3) = 'BTC';

For example an entry in the Column Pair: BTC_NXT

The query should return NXT (everything right of the "_").

Now, when switching over to php while I haven't edited the query at all, I don't get any result. The dbconnection is already established; no problems on that front.

$query_get_pairs = "SELECT RIGHT(`Pair`,LOCATE('_',REVERSE(`Pair`))-1) FROM `poloniex` WHERE LEFT(`Pair`, 3) = 'BTC'";
$result_get_pairs = mysqli_query($dbc,$query_get_pairs);

var_dump($result_get_pairs) returns an empty array.

Summary:

poloniex is the table name.
Pair is the column name which contains values like "BTC_NXT". The query should give me NXT.

There's absolutely NO way that $result_get_pairs would be an empty array. mysqli_query returns either a mysqli statement handle, or a boolean FALSE to signify failure. — Marc B
– Marc B, Commented May 16, 2014 at 19:23
Do you mean mysqli_error($dbc)? That doesnt give me anything. — user3586358
– user3586358, Commented May 16, 2014 at 19:25
That means your query failed, and mysqli_error() would tell you why. — Marc B
– Marc B, Commented May 16, 2014 at 19:27

Hackerman · Accepted Answer · 2014-05-16 19:27:35Z

1

You are not fetching anything, your code should be like:

$query_get_pairs = "SELECT RIGHT(Pair,LOCATE('_',REVERSE(Pair))-1) FROM poloniex WHERE LEFT(Pair, 3) = 'BTC'";
$result_get_pairs = mysqli_query($query_get_pairs);
$myResult = mysqli_fetch_assoc($result_get_pairs);
var_dump($myResult);

answered May 16, 2014 at 19:27

Hackerman

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