php切换数据库的问题，在线等
RT，我的目的是想通过一个地方改变数据库链接，其他页面查询的时候使用新的链接。。
现在我进入一个查询页面tttt.php，用的默认链接，查询出数据为3
然后我通过页面下拉框选择其他区域，选择下拉框的时候我用ajax从后台切换了数据库的链接
这时候我再进入查询页面ttt.php，数据依然是上一个DB的数据，求破。。。
除了把每个区域的DB都列出来切换，请问还有没有其他比较好的方法？（因为区域是动态增加的）
<br />require_once dirname(__FILE__).'/../common/DbSingleHelper.php';<br /> require_once dirname(__FILE__).'/../svr_yunwei_config.php';<br /> $dbsingleHelper = DBSingleHelper::singleton();<br /> $sql = 'select count(*) as ct from login_log';<br /> $res = $dbsingleHelper -> doSql($sql);<br /> echo "查出来的条数:".$res[0]['ct']."<br/>";<br /> //$dbsingleHelper -> changeDbLink("xxxx", "xxx", "xxx", "xxx");<br /> //$r = $dbsingleHelper -> doSql($sql);<br /> //echo "新条数:".$r[0]['ct'];<br />上图的代码，把注释打开是正确的，但是问题是我切换的动作是由操作者触发的，在另外一个页面，另外一个页面触发切换后，这个查询的结果依然是上个DB的数据。。。
意思就是我在一个地方切换db后，无法改变所有页面其他的地方。。。尽管用单列也不行
求指点。。。
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