使用Oracle数据库进行PDO简单选择查询

Question

i want to try to run simple select query to know if the database connection is working fully.

Here is some coding i have done on php file and tried to execute it.

$tns = "
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = COD3R-PC)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = XE)
    )
  )
       ";
try {
    $conn = new PDO("oci:dbname=".$tns, '****', '****');
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    echo 'Connected to database';
} catch(PDOException $e) {
    echo 'ERROR: ' . $e->getMessage();
}
/*if($_POST['searchFilter']){
    $searchFilter = $_POST['searchFilter'];
    $stmt = $conn->prepare("SELECT ROOM, GUEST_NAME FROM RESERVATION_GENERAL_2 WHERE ROOM LIKE ? OR GUEST_NAME LIKE ?");
    $stmt->execute(array('%'.$searchFilter.'%','%'.$searchFilter.'%' ));
    $results = $stmt->fetchAll(PDO::FETCH_ASSOC);
    $stmt->closeCursor();
    if (empty($results)){
      print_r(json_encode(0));
    }
    else{
    print_r(json_encode($results));
    }
}*/
$stmt = $conn->prepare("SELECT * FROM RESERVATION_GENERAL_2");
$stmt->execute(array($stmt));
$results = $stmt->fetchAll(PDO::FETCH_ASSOC);
$stmt->closeCursor();

The only message i got is Connected to database . I am not sure if it is really connected to database or not, cuz i dont know about try and catch much. and after that there is a blank page no result.

Please see the screenshot for the table name and columns.

what am i doing wrong please tell.

Answer 1

Change this line:

$stmt->execute(array($stmt));

To:

$stmt->execute();

You don't have any parameters to execute, in the scenario below it would work:

$stmt = $conn->prepare("SELECT * FROM RESERVATION_GENERAL_2 WHERE reservation_id = ?");
$stmt->execute(array($id));