simpleDB paging

AWS SimpleDB 不支持 offset 这种用法，必須要用 next_token 方式來取
以下用php做個示例： 

//////get pre page NextToken//////

$next_token =null；

$sqlSDB = "select count(*) from `$domainName` where **** limit $jumpLimit";

$domainPage = $this->_amazon->select ( $sqlSDB, $next_token );

$next_token = $domainPage->getToken ();

//////get current page data//////

$sqlSDB = "select * from `$domainName` where **** limit $pageSize";

$domainData = $domainPage->getData ();

$domainPage = $this->_amazon->select ( $sqlSDB, $next_token );

"SELECT COUNT(*)" 是最有效率的略過方法，如果用"SELECT * "則會有 return 2500 rows 的限制！