PHP-MySQL 插入数据时出错

Question

如何解决这个问题

Catchable fatal error: Object of class PDOStatement could not be converted to string in.

我的PHP代码：

$a = $_POST['id'];
$b = $_POST['title'];
$c = $_POST['cat'];
$d = $_POST['cop'];
$e = $_POST['stat'];

$sql = "INSERT INTO books (book_id, book_title, book_category, no_copies, status) VALUES (:a,:b,:c,:d,:e)";
$a = $db->prepare($sql);
$a->execute(array(':a'=>$a, ':b'=>$b, ':c'=>$c, ':d'=>$d, ':e'=>$e));
header('Location: books.php');

Answer 1

为变量使用有意义的名称（例如，$stmt 而不是 $a，这样可以避免冲突）

$stmt = $db->prepare($sql);
$stmt->execute(array(':a'=>$a,':b'=>$b,':c'=>$c,':d'=>$d,':e'=>$e));

Answer 2

你覆盖了你的变量$a

$a = $_POST['id']; // assign here
$a = $db->prepare($sql);// override here

尝试给一个不同的名字

$smt = $db->prepare($sql);
$smt->execute(array(':a'=>$a,':b'=>$b,':c'=>$c,':d'=>$d,':e'=>$e));
header("location: books.php");

PHP-MySQL 插入数据时出错

PHP-MySQL error inserting data

php

pdo