如何使用 PHP 和 PDO 将数组插入到单个 MySQL 准备好的语句中 [英] How to insert an array into a single MySQL Prepared statement w/ PHP and PDO

问题描述

在线注册期间，客户可以选择他们选择注册的多个计划.这些程序是三位整数并存储在一个数组中.

During an online enrollment, a customer may select a number of programs which they choose to enroll for. These programs are three digit integers and are stored in an array.

例如:

我想注册程序 ID 155、165、175 和 185.

I want to enroll in programid 155, 165, 175, and 185.

我的阵列设置非常简单:

My array is set up as simple as:

$data = array();

$data[] = 155;

$data[] = 165;

$data[] = 175;

$data[] = 185;

当需要将此信息插入关联表时，我还会包含来自注册其他部分的其他元素:

When it comes time to insert this information into the associated table, I also include additional elements from the other part of the enrollment:

例如，如果我正在执行 SINGLE 程序插入语句，它将如下所示:

For example, if I were doing a SINGLE program insert statement, it would look as follows:

$stmt = $db->prepare("INSERT INTO table SET memberID=?, programID=?, date_added=NOW()");
$stmt->execute(array($memberid, 155));

我通常会为上面的数组创建一个简单的循环，它会调用 sql 语句的多个实例并执行，例如:

I would normally create a simple loop for the array above which would call multiple instances of the sql statement and execute such as:

for($j = 0; $j < (count($data)-1); $j++) {
   $stmt = $db->prepare("INSERT INTO table SET memberID=?, programID=?, date_added=NOW()");
   $stmt->execute(array($memberid, $data[$j]));
}

我确实意识到上面的代码无效( $data[$j] )但正在寻找正确的调用方式.

I do realize the code above is invalid ( $data[$j] ) but looking for the right way to do the call.

我之前也被告知构建单个动态 sql 语句总体上比像上面这样的多个调用要好.我的第一遍是这样的:

I have also been told before that building a single dynamic sql statement is overall better than multiple calls like above. My first pass would be something like:

$sql = array(); 
foreach( $data as $row ) {
    $sql[] = '("'.$memberid.'", "'.$row[$j].'", NOW()")';
}
mysql_real_query('INSERT INTO table (memberid, programid) VALUES '.implode(',', $sql));

但是对于 PDO，我不太确定这是如何工作的，尤其是占位符 (?).

but with PDO I am not quite sure how this works, especially with placeholders (?).

有什么建议吗?

推荐答案

您可以以编程方式构建查询...:

You could build the query programatically...:

$sql = 'INSERT INTO table (memberID, programID) VALUES ';
$insertQuery = array();
$insertData = array();
foreach ($data as $row) {
    $insertQuery[] = '(?, ?)';
    $insertData[] = $memberid;
    $insertData[] = $row;
}

if (!empty($insertQuery)) {
    $sql .= implode(', ', $insertQuery);
    $stmt = $db->prepare($sql);
    $stmt->execute($insertData);
}

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