可以使用多个/嵌套的MySQLi语句吗？

Question

是否可以MySQLi prepared statement在fetch()之前的声明中进行调用？如果没有,最好的方法是什么？

示例代码:

if($stmt = $link->prepare("SELECT item FROM data WHERE id = ?")) {
    $stmt->bind_param("i", $id);
    $stmt->execute();
    $stmt->bind_result($item);
    while( $stmt->fetch() ) {
        /* Other code here */
        $itemSummary = $item + $magic;
        if($stmt2 = $link->prepare("INSERT INTO summaries (itemID, summary) VALUES (?, ?)")) {
            $stmt2->bind_param("is", $itemID, $itemSummary);
            $stmt2->execute();
            $stmt2->close();
        }
    }
}

Answer 1

这是单一连接方式:

if($stmt = $link->prepare("SELECT item FROM data WHERE id = ?")) {
    $stmt->bind_param("i", $id);
    $stmt->execute();
    $stmt->store_result(); // <-- this
    $stmt->bind_result($item);
    while( $stmt->fetch() ) {
        /* Other code here */
        $itemSummary = $item + $magic;
        if($stmt2 = $link->prepare("INSERT INTO summaries (itemID, summary) VALUES (?, ?)")) {
            $stmt2->bind_param("is", $itemID, $itemSummary);
            $stmt2->execute();
            $stmt2->store_result(); // <-- this
            /*DO WHATEVER WITH STMT2*/
            $stmt2->close();
        }
    }
}

Answer 2

您应该能够做到这一点，尽管您必须启动第二个连接。