正如其他人已經提到的,你不能在MySQL中這樣做。但是,這似乎是你需要做的一次性操作,所以我給你寫了一個快速而骯髒的小php腳本來完成這項工作。它假定你的node_revisions表有一個名爲'id'的主鍵列。如果沒有,編輯適當。另外,不要忘記更改腳本頂部的數據庫主機,用戶名,密碼和數據庫名稱以與您的配置相匹配。
<?php
$host = '127.0.0.1';
$username = 'root';
$password = 'password';
$database = 'test';
$conn = mysql_connect($host, $username, $password);
if (!$conn) {
echo "Unable to connect to DB: " . mysql_error();
exit;
}
if (!mysql_select_db($database)) {
echo "Unable to select " . $database . ": " . mysql_error();
exit;
}
$sql = "SELECT * FROM node_revisions";
$result = mysql_query($sql);
if (!$result) {
echo "Could not successfully run query ($sql) from DB: " . mysql_error();
exit;
}
if (mysql_num_rows($result) == 0) {
echo "No rows found, nothing to print so am exiting";
exit;
}
while ($row = mysql_fetch_assoc($result)) {
$id = $row['id'];
$body = $row['body'];
$teaser = $row['teaser'];
$body = preg_replace('/http:\/\/.*?\.pdf/', '/migration-update', $body);
$teaser = preg_replace('/http:\/\/.*?\.pdf/', '/migration-update', $teaser);
$sql = "UPDATE node_revisions set body='" . mysql_real_escape_string($body) . "', teaser='" . mysql_real_escape_string($teaser) . "' where id=" . $id;
mysql_query($sql);
}
mysql_free_result($result);
mysql_close($conn);
?>
還請注意,我用正則表達式非貪婪的修改,這樣,如果你有身體或傳情場多個PDF的網址,你會不會在它們之間血本無歸。
感謝您提供豐富的鏈接和解釋! – picardo 2009-09-06 06:09:46