PHP 表单未向数据库发送数据

PHP Form Not Sending Data To Database

有人可以帮助我并告诉我为什么我的 php 表单没有将数据发送到数据库。

类型有emp_no(int11)birth_date(date)first_name(varchar14)last_name(varchar16)gender(enum('M','F')hire_date(date)

 // Checks to see if the save button was pressed and if so, then it should run the 
 query that inserts the data into the data fields specified.
if(isset($_POST['save'])) {

    $sql = "INSERT INTO 'employees' ('emp_no', 'birth_date', 'first_name', 
    'last_name', 'gender', 'hire_date')
    VALUES ('".$_POST['emp_no']."', '".$_POST['birth_date']."', 
    '".$_POST['first_name']."', '".$_POST['last_name']."',
    '".$_POST['gender']."', '".$_POST['hire_date']."')";

    $result = mysqli_query($conn, $sql);

    }

代码在这里: https://codepen.io/blackemr/pen/mjMgPQ

更改为:

$sql = "INSERT INTO employees (emp_no, birth_date, first_name, last_name, gender, hire_date) VALUES ...

您还可以 return 错误使用:

$result = mysqli_query($conn, $sql) or trigger_error(mysqli_error($conn));