为什么我的 MySQL 插入语句返回错误?PDOException SQLSTATE[42000]:. - Why is my MySQL INSERT statement returning an error? PDOException SQLSTATE[42000]:

Why is my MySQL INSERT statement returning an error? PDOException SQLSTATE[42000]:

我在mySQL上遇到了一个问题，我真的不知道发生了什么。我知道它与我的语法有关，但不完全是什么。

if(isset($_POST['newBtn'])) {
// Check that everything has values and something has been changed
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$title = $_POST['title'];
$smalldesc = $_POST['smalldesc'];
$fulldesc = $_POST['fulldesc'];
// username = $admin
// date = getdate(today in unix time stamp)
date_default_timezone_set('UTC');
$date = new DateTime();
$date = $date->getTimestamp();
if("Testing form. Not relevant.") {
    echo "<div class='alert alert-warning'>You submitted blank data somewhere, or did not change any data from it's default.</div>";
} else {
    $sqladd = "INSERT INTO theories(theory_name,small_desc,full_desc,author,create_date) VALUES ($title,$smalldesc,$fulldesc,$admin,$date)";
    try {
    $sth = $dbh->query($sqladd);
    echo "<div class='alert alert-success'><b>Success!</b>You Have created a new theory that is availible for viewing to the public.</div>";
} catch(PDOExecption $e) {
echo "<div class='alert alert-error'><b>Error!</b>Could not add to database.<br />". $e->getMessage() ."</div>";
}
}
}

我收到此错误：

Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[42000]: Syntax
error or access violation: 1064 You have an error in your SQL syntax; check the manual that
corresponds to your MariaDB server version for the right syntax to use near 'Form,I 
shouldn't be having this much of an issue with php.,I really hate when PH' at line 1' in 
/srv/http/mt-chillad/users/admin-theories.php:42 Stack trace: #0 /srv/http/mt-
chillad/users/admin-theories.php(42): PDOStatement->execute() #1 {main} thrown in 
/srv/http/mt-chillad/users/admin-theories.php on line 42

Yikes，使用参数绑定

try {
    $stmt = $sbh->prepare('INSERT INTO theories(theory_name,small_desc,full_desc,author,create_date) VALUES (?, ?, ?, ?, ?)');
    $stmt->execute([$title,$smalldesc,$fulldesc,$admin,$date]);
    // and so on

发生此错误是因为您直接在查询中插入了未经审查和未引号的值。