php, mysqli_stmt::bind_param() [mysqli-stmt.bind-param]：变量的数量与准备好的语句中的参数数量不匹配

Question

我有以下代码：

$id = $_GET['id'];

// get the recod from the database
if($stmt = $mysqli->prepare("SELECT * FROM date WHERE id=?"))
{
        $stmt->bind_param("isssssssss", $id, $mtcn, $amount, $currency, $sender_name, $sender_country, $receiver_name, $comment, $support, $email);
        $stmt->execute();

        $stmt->bind_result($id, $mtcn, $amount, $currency, $sender_name, $sender_country, $receiver_name, $comment, $support, $email);
        $stmt->fetch();

        // show the form
        renderForm($mtcn, $amount, $currency, $sender_name, $sender_country, $receiver_name, $comment, $support, $email, NULL, $id);

        $stmt->close();
}
// show an error if the query has an error
else
{
        echo "Error: could not prepare SQL statement";
}

会产生以下错误/警告：

Warning: mysqli_stmt::bind_param() [mysqli-stmt.bind-param]: Number of variables doesn't match number of parameters in prepared statement in C:\wamp\www\records.php on line 143

Warning: mysqli_stmt::execute() [mysqli-stmt.execute]: (HY000/2031): No data supplied for parameters in prepared statement in C:\wamp\www\records.php on line 144

Warning: mysqli_stmt::bind_result() [mysqli-stmt.bind-result]: Number of bind variables doesn't match number of fields in prepared statement in C:\wamp\www\records.php on line 146

Warning: mysqli_stmt::fetch() [mysqli-stmt.fetch]: (HY000/2053): Attempt to read a row while there is no result set associated with the statement in C:\wamp\www\records.php on line 147

表格并没有像我预期的那样使用来自 db 的数据完成......任何建议/帮助将不胜感激。

Answer 1

您误解了语句的使用。

在你的查询语句中，你只需要绑定一个参数，id。

$stmt->bind_param("i", $id);
$id = 5; // fetch the fifth record
$stmt->execute();

然后您通过获取结果对象来访问查询结果中的值。

查看 mysqli_stmt::execute 示例，php.net