如何确保我从 MySQLi::multi_query 中捕获到所有错误

问题描述

multi_query 文档 说:

如果第一条语句失败，则返回 FALSE.要从其他语句中检索后续错误，您必须先调用 mysqli_next_result().

Returns FALSE if the first statement failed. To retrieve subsequent errors from other statements you have to call mysqli_next_result() first.

next_result 的 文档 说:

成功时返回 TRUE，失败时返回 FALSE.

Returns TRUE on success or FALSE on failure.

最后，multi_query 文档中发布的示例使用 next_result 的返回值来确定何时不再有查询；例如停止循环:

Finally, the example posted in the docs for multi_query use the return value from next_result to determine when there are no more queries; e.g. to stop looping:

<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s
", mysqli_connect_error());
    exit();
}

$query  = "SELECT CURRENT_USER();";
$query .= "SELECT Name FROM City ORDER BY ID LIMIT 20, 5";

    /* execute multi query */
    if ($mysqli->multi_query($query)) {
        do {
            /* store first result set */
            if ($result = $mysqli->store_result()) {
                while ($row = $result->fetch_row()) {
                    printf("%s
", $row[0]);
                }
                $result->free();
            }
            /* print divider */
            if ($mysqli->more_results()) {
                printf("-----------------
");
            }
        } while ($mysqli->next_result()); // <-- HERE!
    }

    /* close connection */
    $mysqli->close();
    ?>

我不知道提供的查询数量，也不知道我将要执行的 SQL.因此，我不能仅将查询数量与返回结果的数量进行比较.然而，如果第三个查询是损坏的查询，我想向用户显示一条错误消息.但我似乎没有办法判断 next_result 失败是因为没有更多的查询要执行，还是因为 SQL 语法有错误.

I don't know the number of queries provided, nor do I know anything about the SQL that I'm going to execute. I therefore can't just compare the number of queries against the number of returned results. Yet I want to display an error message to the user if, say, the third query was the broken query. But I don't seem to have a way to tell if next_result failed because there were no more queries to execute, or if it's because there was an error in the SQL syntax.

如何检查所有查询是否有错误?

How can I check all the queries for errors?

推荐答案

尽管文档中有代码示例，但也许更好的方法是这样的:

Despite the code example in the docs, perhaps the better method would be something like this:

if ($mysqli->multi_query(...)) {
  do {
    // fetch results

    if (!$mysqli->more_results()) {
      break;
    }
    if (!$mysqli->next_result()) {
      // report error
      break;
    }
  } while (true);
}

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