0 
 //connected to db

if (isset($_POST['teacherusername'])) {

$_SESSION['teacherusername'] = $_POST['teacherusername'];

}

        $sql = "SELECT TeacherId FROM Teacher WHERE (TeacherUsername = ?)";

        $stmt=$mysqli->prepare($sql);
        $stmt->bind_param("s",$_SESSION['teacherusername']);
        $stmt->execute();
        $record = $stmt->fetch();
        $teacherid = $record['TeacherId'];
        $stmt->close();




        if($_SERVER['REQUEST_METHOD'] == 'POST')

        {

        $time = str_replace(array(' Hrs ', ' Mins ', ' Secs'), array(':', ':', ''), $_SESSION['durationChosen']);

        $insertsql = "INSERT INTO Session (SessionId, SessionTime, SessionDate, SessionWeight, SessionDuration, TotalMarks, ModuleId, TeacherId, Room) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)";
        $insert = $mysqli->prepare($insertsql);

        for ($i = 1, $n = $_SESSION['sessionNum']; $i <= $n; ++$i) {
            $sessid = $_SESSION['id'] . ($n == 1 ? '' : $i);
            $sessdate = date("Y-m-d", strtotime($_SESSION['dateChosen']));

            $insert->bind_param("sssssssss", $sessid, $_SESSION['timeChosen'], $sessdate,
                             $_SESSION['textWeight'], $time, $_SESSION['textMarks'],
                             $_SESSION['module'], $teacherid, $_SESSION['rooms']);

            $insert->execute();

           if ($insert->errno) { echo "Error in insert: $insert->error<br>\r\n"; }

            $insert->close();
        }


        }

更新：

以前的错误已得到修复，但我现在收到 4 个警告，如下所示：

警告：mysqli_stmt::bind_param() [mysqli-stmt.bind-param]：无法在第 177 行的 /web/stud/.../Mobile_app/insertsession.php 中获取 mysqli_stmt

警告：mysqli_stmt::execute() [mysqli-stmt.execute]：无法在第 179 行的 /web/stud/.../Mobile_app/insertsession.php 中获取 mysqli_stmt

警告：main() [function.main]：无法在第 181 行的 /web/stud/.../Mobile_app/insertsession.php 中获取 mysqli_stmt

警告：mysqli_stmt::close() [mysqli-stmt.close]：无法在第 185 行的 /web/stud/.../Mobile_app/insertsession.php 中获取 mysqli_stmt

由于 mysqli 现在正在向数据库中插入数据，我应该处理这些警告还是不理会它们？

问题已解决，未来的观众请看 DAVE RANDOM 的回答

4

1 回答 1

1

只需在循环末尾添加这一行，它应该可以工作：

$insert->close();

如果在您显示的代码之前执行的代码中仍然没有未关闭的语句，这将起作用。您必须先关闭前一个语句，然后才能执行另一个语句。

有关mysqli_stmt::close()更多信息，请参阅。

编辑

试试这个代码：

//connected to db

$sql = "
  SELECT TeacherId
  FROM Teacher
  WHERE TeacherUsername = ?
";

if (!$stmt = $mysqli->prepare($sql)) {
  // Handle errors with prepare operation here
}

// Bind parameter for statement
$stmt->bind_param("s", $_SESSION['teacherusername']);

// Execute the statement
$stmt->execute();

// This is what matters. With MySQLi you have to bind result fields to
// variables before calling fetch()
$stmt->bind_result($teacherid);

// This populates $teacherid
$stmt->fetch();

// Close the statment
$stmt->close();

if($_SERVER['REQUEST_METHOD'] == 'POST')

{

    $time = str_replace(array(' Hrs ', ' Mins ', ' Secs'), array(':', ':', ''), $_SESSION['durationChosen']);

    $insertsql = "
      INSERT INTO Session
        (SessionId, SessionTime, SessionDate, SessionWeight, SessionDuration, TotalMarks, ModuleId, TeacherId, Room)
      VALUES
        (?, ?, ?, ?, ?, ?, ?, ?, ?)
    ";
    if (!$insert = $mysqli->prepare($insertsql)) {
      // Handle errors with prepare operation here
    }

    for ($i = 1, $n = $_SESSION['sessionNum']; $i <= $n; ++$i) {

        $sessid = $_SESSION['id'] . ($n == 1 ? '' : $i);
        $sessdate = date("Y-m-d", strtotime($_SESSION['dateChosen']));

        $insert->bind_param("sssssssss", $sessid, $_SESSION['timeChosen'], $sessdate,
                     $_SESSION['textWeight'], $time, $_SESSION['textMarks'],
                     $_SESSION['module'], $teacherid, $_SESSION['rooms']);

        $insert->execute();

        if ($insert->errno) {
          // Handle query error here
        }

        $insert->close();

    }


}
于 2012-06-15T11:07:47.480 回答