php PDO使用占位符批量插入多行

2021-12-26 00:00:00 bulkinsert insert php pdo

我希望使用 PHP PDO 进行多次插入.

I am looking to do multiple inserts using PHP PDO.

我找到的最接近的答案是这个

The closest answer I have found is this one

how-to-insert-an-array-into-a-single-mysql-prepared-statement

但是给出的示例使用 ??而不是真正的占位符.

However the example thats been given uses ?? instead of real placeholders.

我查看了 PHP 文档站点上的占位符示例

I have looked at the examples on the PHP doc site for place holders

php.net pdo.prepared-statements

$stmt = $dbh->prepare("INSERT INTO REGISTRY (name, value) VALUES (:name, :value)");
$stmt->bindParam(':name', $name);
$stmt->bindParam(':value', $value);

现在假设我想用数组实现上述目标

Now lets say I wanted to achieve the above but with an array

$valuesToInsert = array(
  0 => array('name' => 'Robert', 'value' => 'some value'),
  1 => array('name' -> 'Louise', 'value' => 'another value')
);

对于 PDO 和每个事务的多个插入，我将如何处理?

我想它会从一个循环开始?

I imagine it would start of with a loop?

$stmt = $dbh->prepare("INSERT INTO REGISTRY (name, value) VALUES (:name, :value)");

foreach($valuesToInsert as $insertRow){

    // now loop through each inner array to match binded values
    foreach($insertRow as $column => value){
        $stmt->bindParam(":{$column}", value);
    }
}
$stmt->execute();

然而，上述方法不起作用，但希望能证明我试图实现的目标

However the above does not work but hopefully will demonstrate what im trying to achieve

推荐答案

首先，? 符号是真正的占位符(大多数驱动程序允许同时使用这两种语法，位置和命名占位符).其次，准备好的语句只不过是一种将原始输入注入到 SQL 语句中的工具——SQL 语句本身的语法不受影响.您已经拥有所需的所有元素:

First of all, ? symbols are real place-holders (most drivers allow to use both syntaxes, positional and named place-holders). Secondly, prepared statements are nothing but a tool to inject raw input into SQL statements—the syntax of the SQL statement itself is unaffected. You already have all the elements you need:

  • 如何使用单个查询插入多行
  • 如何动态生成 SQL
  • 如何使用带有命名占位符的预处理语句.

将它们全部结合起来非常简单:

It's fairly trivial to combine them all:

$sql = 'INSERT INTO table (memberID, programID) VALUES ';
$insertQuery = [];
$insertData = [];
$n = 0;
foreach ($data as $row) {
    $insertQuery[] = '(:memberID' . $n . ', :programID' . $n . ')';
    $insertData['memberID' . $n] = $memberid;
    $insertData['programID' . $n] = $row;
    $n++;
}

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

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