语法错误或访问冲突：1064-插入PDO时出错，但已成功插入行

Question

我第一次使用PDO时遇到一些问题。插入后出现错误：

   <?php 

require_once '_dbconnect.php';

// Attempt insert query execution
try{
    // Create prepared statement
    $sql = "INSERT INTO `entrysubmissions` (boxnum, entryname, entryemail) VALUES (:boxnum, :entryname, :entryemail );";
    $stmt = $conn->prepare($sql);

    // Bind parameters to statement
    $stmt->bindParam(':boxnum', $_REQUEST['entryboxid'], PDO::PARAM_INT);
    $stmt->bindParam(':entryname', $_REQUEST['entryname'], PDO::PARAM_STR);
    $stmt->bindParam(':entryemail', $_REQUEST['entryemail'], PDO::PARAM_STR);

    // Execute the prepared statement
    $stmt->execute();
    echo "Entry Submitted Successfully.";
    print $_REQUEST['entryboxid'];
    print $_REQUEST['entryname'];
    print $_REQUEST['entryemail'];

    $conn->exec($sql);

    $last_id = $conn->lastInsertId();
    echo "Records inserted successfully. Last inserted ID is: " . $last_id;

} catch(PDOException $e){
    die("ERROR: Could not able to execute $sql. " . $e->getMessage());
}

 // Close statement
unset($stmt);

// Close connection
unset($pdo);
?>

我遇到错误，但是该行已成功插入。我一定在做一些明显的错误，但是我找不到它。正确的值将插入表中。

ERROR: Could not able to execute INSERT INTO `entrysubmissions` (boxnum, entryname, entryemail) VALUES (:boxnum, :entryname, :entryemail );. SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ':boxnum, :entryname, :entryemail )' at line 1

非常感谢您的帮助。我确实尝试过，但是今天看来我在googlefu上失败了。

---

编辑：由@Magnus Eriksson解决，我执行了两次查询。

    $stmt->execute();
...
    $conn->exec($sql);

Answer 1

您正在尝试执行两次查询。

// First here
$stmt->execute();

echo "Entry Submitted Successfully.";
print $_REQUEST['entryboxid'];
print $_REQUEST['entryname'];
print $_REQUEST['entryemail'];

// Then again here
$conn->exec($sql);

删除最后一个：

$conn->exec($sql);

您应该被设置。

Answer 2

您的代码很好，只需从代码中删除$ conn-> exec（$ sql）;，您将执行两次，这就是为什么会出错的原因。