Connect to Multiple Databases using MySQLi

Question

I need to connect to two databases using PHP and use the results from the first query to get the rest of the data I need out of a second database.

So for the second c

Answer 1

If you want to perform queries in two databases at the same time you need to have two separate mysqli objects. To open the connection you can use the following code:

// Don't forget to enable error reporting!
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);

$db1 = new mysqli('localhost', 'user', 'pass', 'dbName');
$db1->set_charset('utf8mb4'); // always set the charset

$db2 = new mysqli('localhost', 'user', 'pass', 'dbName2');
$db2->set_charset('utf8mb4'); // always set the charset

Then you can perform your two statements in each database separately.

// get id value
$id = intval($_GET['cd']);

// Get client name from DB1
$stmt = $db1->prepare('SELECT client FROM appointments WHERE ID = ?');
$stmt->bind_param('s', $id);
$stmt->execute();
$client = $stmt->get_result()->fetch_object();

// Get state and zipcode from DB2
$stmt = $db2->prepare('SELECT state,zipcode FROM location WHERE ClientName  = ?');
$stmt->bind_param('s', $client->client);
$stmt->execute();
$location = $stmt->get_result()->fetch_object();

echo $location->state;
echo $location->zipcode;