我在drupal 7中修改了下面的FAQ搜索模块查询，该模块可以在两个表中进行搜索：1）标题2）正文，但没有再添加一个。

$term = strip_tags(drupal_substr($_POST['keyword'], 0, 100));

$query = "SELECT DISTINCT fq.title, fq.nid
 FROM {node} AS fq, {field_data_body} AS f
 WHERE fq.title LIKE :term
 OR fq.type LIKE :term
 OR f.body_value LIKE :term
 AND f.entity_id = fq.nid";

$result = db_query($query, array(':term' => '%%' . $term . '%%',':term' => '%%' . $term . '%%',':term' => '%%' . $term . '%%'));

我想再添加一个以在搜索中包括详细问题字段，但是我认为nid的链接是问题所在吗？我试图将两者都放在一个子句中，但似乎是错误的。请帮忙 ：）

AND（fd.entity_id = fq.nid或fb.entity_id = fq.nid）”；

$term = strip_tags(drupal_substr($_POST['keyword'], 0, 100));
$query = "SELECT DISTINCT fq.title, fq.nid
    FROM {node} AS fq, {field_data_field_detailed_question} AS fd, {field_data_body} AS fb
    WHERE fq.title LIKE :term
    OR fd.field_detailed_question_value LIKE :term
    OR fb.body_value LIKE :term
    AND (fd.entity_id = fq.nid OR fb.entity_id = fq.nid)";
$result = db_query($query, array(':term' => '%%' . $term . '%%',':term' => '%%' . $term . '%%',':term' => '%%' . $term . '%%'));

$string = "";
while ($row = $result->fetchObject()) {
    $string .= "<a href='/" . drupal_get_path_alias('node/' . $row->nid) . "'>" . $row->title . "</a>"; 
}
echo $string;

更新： 感谢Syscall的帮助，他帮助我使方法得以实现（请参见聊天）。

我还设法删除了空白（通过添加一个新变量并使用array_filter>我猜问题是在array_map仍创建空字符串的同时拆分空白和修整。）并添加了一个条件以排除未通过db_and发布的节点）引用n.status
= 1。

$terms = explode(' ', $term); // split using ' '
$terms = array_map('trim', $terms); // remove unwanted spaces
$termsfiltered = array_filter($terms);
$or = db_or();
foreach ($termsfiltered as $term) {
    $or->condition('fd.field_detailed_question_value', '%'.db_like($term).'%', 'LIKE');
    $or->condition('fb.body_value','%'.db_like($term).'%' , 'LIKE');
    $or->condition('n.title','%'.db_like($term).'%' , 'LIKE');
}
$and = db_and()->condition('n.status','1' , 'LIKE');

$query = db_select('node', 'n');
$query->fields('n');
$query->leftJoin('field_data_body' , 'fb', 'fb.entity_id=n.nid');
$query->leftJoin('field_data_field_detailed_question' ,'fd', 'fd.entity_id=n.nid');
$query->condition($or);
$query->condition($and);
$stmt = $query->execute(); // execute the query (returns the "statement" to fetch).

ps插入 var_dump（$ variabletodump）; 在更改代码和查看数组的效果以解决问题时确实很有帮助。