我正在尝试通过php的PDO类(mysql驱动程序)进行搜索。我在MySQL客户端上使用以下查询(更改表名以保护无辜者)：

SELECT    hs.hs_pk,

hs.hs_text,

hs.hs_did,

hd.hd_did,

hd.hd_text,

hv.hv_text,

hc.hc_text

FROM      hs

LEFT JOIN hd

ON       hs.hs_did = hd.hd_did

LEFT JOIN hd

ON       hd.hd_vid = hv.hv_id

LEFT JOIN hc

ON       hd.hd_pclass = hc.hc_id

WHERE     hs.hs_text LIKE "%searchTerm%"

LIMIT 25;

不管我使用什么搜索词，它都像一个符咒。但是，当我转到php时，无法获得返回任何内容的信息。我尝试了几种看起来合乎逻辑的语法，但是没有尝试过。这是我现有的代码：

$handle = fopen('/foo/bar/test.log', 'w+');

fwrite($handle, "doSearch, with search term: $searchTerm\n");

$sql =

'SELECT   hs.hs_pk,

hs.hs_text,

hs.hs_did,

hd.hd_did,

hd.hd_text,

hv.hv_text,

hc.hc_text

FROM      hs

LEFT JOIN hd

ON       hs.hs_did = hd.hd_did

LEFT JOIN hd

ON       hd.hd_vid = hv.hv_id

LEFT JOIN hc

ON       hd.hd_pclass = hc.hc_id

WHERE     hs.hs_text LIKE :searchTerm

LIMIT 25';

try {

$dbh = new PDO('mysql:host=localhost;dbname=awdb', "user", "password");

fwrite($handle, "connected to DB\n");

$prep = $dbh->prepare($sql);

$ret = $prep->execute(array(':searchTerm' => '"%'.$searchTerm.'%"'));

while ($row = $prep->fetch(PDO::FETCH_ASSOC)) {

$i++;

$result[$i]['subText'] = $row['hs_pk'];

$result[$i]['subText'] = $row['hs_text'];

$result[$i]['subDid'] = $row['hs_did'];

$result[$i]['devDid'] = $row['hd_did'];

$result[$i]['devText'] = $row['hd_text'];

$result[$i]['vendorText'] = $row['hv_text'];

$result[$i]['classText'] = $row['hc_text'];

}

$dbh = null;

}

catch (PDOException $e) {

print "Error!: " . $e->getMessage() . "
";

die();

}

我也尝试了以下操作(SQL WHERE子句和prep-> execute行已全部更改)：

WHERE hs.hs_text LIKE CONCAT(\'%\', ?, \'%\')

$ret = $prep->execute(array($searchTerm));

WHERE hs.hs_text LIKE "%:searchTerm%"

$ret = $prep->execute(array(':searchTerm' => $searchTerm));

WHERE hs.hs_text LIKE ":searchTerm"

$ret = $prep->execute(array(':searchTerm' => '%'.$searchTerm.'%'));

等等...