drupal sql 多个表的条件子句？

我对常见问题解答搜索模块进行了以下查询，修改后可在 Drupal 7 中使用， 它在两个表中搜索：1）标题2）正文但无法再包含一个。

$term = strip_tags(drupal_substr($_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含详细问题字段，但我认为 nid 的链接是问题所在？我尝试将两者都放入一个子句中，但似乎是错误的。请帮助 ：）

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;

UPDATE:感谢 Syscall 帮助我使他的方法发挥作用（参见聊天）。

我还设法删除了空空格（通过添加新变量并使用 array_filter > 我猜问题是在 array_map 仍然创建空字符串的同时分割空格和修剪。）并添加一个条件来排除未通过 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).

附注插入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。

你不能连锁leftJoin（或任何join）在 Drupal 查询中，因为leftJoin() https://api.drupal.org/api/drupal/includes%21database%21select.inc/function/SelectQuery%3A%3AleftJoin/7.x返回别名，而不是查询。那么你应该使用execute() https://api.drupal.org/api/drupal/includes%21database%21query.inc/function/Query%3A%3Aexecute/7.x“运行”查询。

$or = db_or()
  ->condition('fd.field_detailed_question_value', '%'.db_like($term ).'%', 'LIKE')
  ->condition('fb.body_value','%'.db_like($term ).'%' , '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);
$stmt = $query->execute(); // execute the query (returns the "statement" to fetch).

while ($row = $stmt->fetchObject()) {
    //..
}

您必须添加字段：

$query = db_select('node', 'n')->fields('n');

or

$query = db_select('node', 'n')
         ->addField('n','title')
         ->addField('n','nid');