php获得sybase数据库内容的问题
数据库连接已经测试过了没问题，sql语句也没问题。现在问题是获取不到数据库里的数据，代码如下：
public static function Connect()<br>
{<br>
$obj =new DB();<br>
$conn=$obj->Connection=sybase_connect(SERVER_NAME, USER, PASSWORD) ; // 连接数据库<br>
if(!$conn){<br>
echo '数据库连接错误...';<br>
exit(0);<br>
}<br>
sybase_select_db(DATABASE_NAME);<br>
return $obj; <br>
}<br>
//初始化页面时查询最近一个月的销售记录<br>
public function QueryLastMonth(){<br>
$start_date=str_replace('-','',date('Y-m-d',strtotime('-1 month')));<br>
$end_date=str_replace('-','',date('Y-m-d',time()));<br>
$sql_str="select cusno as shopcode,u2.nos as salesid,u2.colthno as goodsid,u2.endprice as price,u2.nb as goodscount from u2sale u1,u2saleb u2 where u1.outdate>=";<br>
$sql=$sql_str ."'".$start_date."' and u1.outdate<='".$end_date."' and u1.nos=u2.nos and u1.nb>0 and u2.endprice>0;";<br>
<br>
//echo $sql;<br>
// sybase_query("set rowcount " . 20) ; // 执行SQL命令，设置返回记录行数<br>
$result = sybase_query($sql) ; // 执行SQL命令，检索数据库<br>
echo "---".$result;<br>
while($row = sybase_fetch_assoc($result)) <br>
{ <br>
// echo 'xxx';<br>
echo $row["shopcode"] . "---" . $row["salesid"] . "---" . $row["goodscount"] . "\n" ;<br>
}<br>
<br>
sybase_close($conn);<br>
}请指教
