在布尔值上调用成员函数 bind_param()

问题描述

我尝试在php中将参数绑定到sql(mysqli)，但是出现上面写的错误代码.这是我写的代码:

I try to bind parameters to sql (mysqli) in php, but there is an error code as written above. This is the code I wrote:

$stmt = $conn->prepare("INSERT INTO assignments (Classes_has_Subjects_classesHasSubjectsId, assignmentName, gradeForAssignment,protectiveGrade) 
                                  VALUES (?, ?, ?, ?)");
if ($stmt = false)
{
    echo "false";
}
else{
    $stmt->bind_param("sss", $classesHasSubjectsId, $assignmentName, $gradeForAssignment,  $protectiveGrade);
    $stmt->execute();
}

这里是错误信息:11

致命错误:在布尔值上调用成员函数 bind_param()

Fatal error: Call to a member function bind_param() on boolean in

怎么了?

推荐答案

<?php
$stmt = $conn->prepare("INSERT INTO assignments (Classes_has_Subjects_classesHasSubjectsId, assignmentName, gradeForAssignment,protectiveGrade) 
                                  VALUES (?, ?, ?, ?)");
    if (!$stmt) {
        echo "false";
    }
    else {
        $stmt->bind_param("ssss", $classesHasSubjectsId, $assignmentName, $gradeForAssignment,  $protectiveGrade);
        $stmt->execute();
    }

if ($stmt = false) 表示您将 false 分配给 $stmt.将其替换为 if (!$stmt).

if ($stmt = false) means you're assigning false to $stmt. Replace it with if (!$stmt).

您绑定了 4 个参数，但只提供了 3 种类型的值.我在 bind_param 函数中添加了一个 s，假设您的所有值都是字符串.如果某些值是整数，则用 i 替换相应的 s.如果有双打，替换为 d.

You're binding 4 parameters but only providing 3 types of values. I added a s in the bind_param function, assuming all your values are string. If some of the values are integers replace the corresponding s with an i. If there are doubles, replace with a d.

您确定 assignments 表中第一个字段的名称是 Classes_has_Subjects_classesHasSubjectsId?

Are you sure the first field's name in the assignments table is Classes_has_Subjects_classesHasSubjectsId?

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