php - 如何正确使用 mysqli_stmt::bindParam()

Question

我很难理解如何正确使用bindParam()；

我一直在关注以下 URL 的详细信息:http://php.net/manual/en/pdo.prepared-statements.php其中的示例之一如下所示:

<?php
$stmt = $dbh->prepare("INSERT INTO REGISTRY (name, value) VALUES (?, ?)");
$stmt->bindParam(1, $name);
$stmt->bindParam(2, $value);

// insert one row
$name = 'one';
$value = 1;
$stmt->execute();

// insert another row with different values
$name = 'two';
$value = 2;
$stmt->execute();
?>

这个示例显然不完整，但是，它显示了足够的细节，我应该能够重现相同的结果。

我已将下面的代码从主程序中取出，并将其放入自己的文件中，看看是否可以隔离问题，到目前为止，它已经隔离了。我复制了输入数据的片段，以重新创建与真实数据相同的条件，好吧，我做对了，因为我遇到了相同的错误。

我收到错误消息:调用未定义的方法 mysqli_stmt::bindparam() 这让我相信 stmt 出了问题。因此，我放入了一些调试代码来查看 stmt 内部的内容。它似乎是一个对象，因此，它已定义，到目前为止，没有任何 SQL 错误提示 SQL 语法错误，一切都连接起来，并且似乎运行正常，并且该对象在我看来已定义，但是，一分钟它会使用它，它是未定义的。

我很茫然，因为我尽我所能地遵循了这个例子。看来 bindParam() 在设置时使用了引用，因此我提前创建了变量，以便它可以使用。

有一些我不明白的事情，并且文档的解释不足以让我理解。

以下是我正在使用的测试脚本，它是完整的文件，减去了一些明显的东西。

<?php
$servername = "localhost";
$username   = "-----";
$password   = "--------";
$dbname     = "-----";
$EN["Data"]["Episode"][1]["id"] = "1";
$EN["Data"]["Episode"][1]["seasonid"] = "14";
$EN["Data"]["Episode"][1]["seriesid"] = "143";
$EN["Data"]["Episode"][1]["SeasonNumber"] = "1";
$EN["Data"]["Episode"][1]["EpisodeName"] = "1";
$EN["Data"]["Episode"][2]["id"] = "2";
$EN["Data"]["Episode"][2]["seasonid"] = "14";
$EN["Data"]["Episode"][2]["seriesid"] = "143";
$EN["Data"]["Episode"][2]["SeasonNumber"] = "1";
$EN["Data"]["Episode"][2]["EpisodeName"] = "2";

echo "<pre>";
print_r($EN);
echo "</pre>";

$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
if (! $conn->set_charset("utf8mb4")) {
    die("Error loading character set utf8: " . $conn->error);
}
$stmt = $conn->prepare( "INSERT INTO TVEpisodes 
    (id,  seasonid,  seriesid,  SeasonNumber,  EpisodeName)
VALUES (?, ?, ?, ?, ?)" );

if ($stmt == FALSE) {    /*<--- didn't fail here. */
    echo "Error: " . $sql . "<br>" . $conn->error;
    exit();  // should not happen at this point, mabye...
}
echo "<pre>";
var_dump($stmt);         /*<--- both show I have data.*/
print_r($stmt); 
echo "</pre>";

$episode_id = " ";
$episode_seasonid = " ";
$episode_seriesid = " ";
$episode_SeasonNumber = " ";
$episode_EpisodeName = " ";

$stmt->bindParam(1, $episode_id);  /*<------ fails here.*/
echo "<pre>";
var_dump($stmt);
print_r($stmt); 
echo "</pre>";
$stmt->bindParam(2, $episode_seasonid);
$stmt->bindParam(3, $episode_seriesid);
$stmt->bindParam(4, $episode_SeasonNumber);
$stmt->bindParam(5, $episode_EpisodeName);
foreach ($EN["Data"]["Episode"] as &$episode) {
    echo "<pre>->>>";
    print_r($episode);
    echo "<<<<- </pre>";
    $episode_id = $episode["id"];
    $episode_seasonid = $episode["seasonid"];
    $episode_seriesid = $episode["seriesid"];
    $episode_SeasonNumber = $episode["SeasonNumber"];
    $episode_EpisodeName = $episode["EpisodeName"];
    if ($stmt->execute() != TRUE) {
        echo "Error: " . $sql . "<br>" . $conn->error;
        exit();  // should not happen at this point, mabye...
    }
}
?>

这是显示输出值的输出页面。

Array
(
    [Data] => Array
        (
            [Episode] => Array
                (
                    [1] => Array
                        (
                            [id] => 1
                            [seasonid] => 14
                            [seriesid] => 143
                            [SeasonNumber] => 1
                            [EpisodeName] => 1
                        )

                    [2] => Array
                        (
                            [id] => 2
                            [seasonid] => 14
                            [seriesid] => 143
                            [SeasonNumber] => 1
                            [EpisodeName] => 2
                        )

                )

        )

)
object(mysqli_stmt)[2]
  public 'affected_rows' => null
  public 'insert_id' => null
  public 'num_rows' => null
  public 'param_count' => null
  public 'field_count' => null
  public 'errno' => null
  public 'error' => null
  public 'error_list' => null
  public 'sqlstate' => null
  public 'id' => null
mysqli_stmt Object
(
    [affected_rows] => 0
    [insert_id] => 0
    [num_rows] => 0
    [param_count] => 5
    [field_count] => 0
    [errno] => 0
    [error] => 
    [error_list] => Array
        (
        )

    [sqlstate] => 00000
    [id] => 1
)

( ! ) Fatal error: Call to undefined method
 mysqli_stmt::bindparam() in /home/-long-path-/test.php on line 45

Answer 1

首先，您在第一段中给出的链接属于 PDO。但在标题中你说的是 mysqli，而在代码中你创建了 mysqli。

因此您需要阅读此处的文档:

http://php.net/manual/en/mysqli-stmt.bind-param.php

$stmt->bind_param('ssss', $episode_seasonid,$episode_seriesid,$episode_SeasonNumber,$episode_EpisodeName);