我试图将关联PHP数组(表)存储到数据库中。这是一个包含许多字段的大数组(大约30个字段)，我只是想将这个数组的6个字段存储到一个有6个字段的表中。此数组中的每一行都包含特定项目的信息。我想确保每篇文章只存储一次(没有重复)，所以在存储数据之前，我需要检查数据库的重复查询。这是我的代码不能正常工作。如果有人能帮我，我会很感激的。
<?php $results = $PubMedAPI->query($term, false); ?>
<?php if (!empty($results)): ?>
<?php
$con=mysqli_connect("localhost","root","","db");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
foreach ($results as $result):
$pmid = $result['pmid'];
$title = $result['title'];
$authors = $result['authors'];
$journalabbrev = $result['journalabbrev'];
$year = $result['year'];
$abstract = $result['abstract'];
$fetched_articles = mysqli_query($con,"SELECT pmid FROM articles");
while( ($row = mysqli_fetch_array($fetched_articles))) {
if ($row['pmid'] == $pmid) {
echo "This record has already been stored into the database!";
} else {
mysqli_query($con,"INSERT INTO articles (pmid, title, authors, journalabbrev, year, abstract)
VALUES ('$pmid', '$title', '$authors', '$journalabbrev', '$year', '$abstract')");
echo "This record has been stored into the database!";
}
}
endforeach;
mysqli_close($con);
?>
<?php endif; ?>
下面是一些未经测试的代码，可以更快地完成:
$select = "SELECT pmid FROM articles WHERE pmid IN (";
foreach($result in $results) {
$select .= $result['pmid'] . ',';
}
$select = trim($select,',') . ")";
$existing_pmid = array();
while( ($row = mysqli_fetch_array($select))) {
$existing_pmid[$row['pmid']] = 1;
}
foreach ($results as $result) {
if(isset($existing_pmid[$result['pmid']])) {
echo "This record has already been stored into the database!";
continue;
}
$pmid = $result['pmid'];
$title = $result['title'];
$authors = $result['authors'];
$journalabbrev = $result['journalabbrev'];
$year = $result['year'];
$abstract = $result['abstract'];
mysqli_query($con,"INSERT INTO articles (pmid, title, authors, journalabbrev, year, abstract) VALUES ('$pmid', '$title', '$authors', '$journalabbrev', '$year', '$abstract')");
echo "This record has been stored into the database!";
}