PHP实现的oracle分页函数实例

/**
 * 数据连接
 */
function connect($db_user, $db_pwd, $db_name, $db_nls)
{
 $this->dbh = oci_connect($db_user, $db_pwd, $db_name, $db_nls);
}
function getall($query, $start=0, $rows=-1)
{
 $this->dbh = emptyempty($this->dbh) "SELECT * FROM ( SELECT ROWNUM as row_num, r.* FROM ( $query ) r WHERE ROWNUM <= $end_row ) WHERE $start_row <= row_num";
 return $this->getall($query);
}
/**
* 获取一个查询的总行数
*
* $string $sql 查询语句
*
* return integer 总行数
*/
function getcount($sql){
 $subSQL = 'select count(*) '.stristr($sql, 'from');
 return $this->getone($subSQL);
}
function getone($query)
{
 $row = $this->getrow($query);
 if (is_array($row))
 $one = current($row);
 else
 $one = '';
 unset($row);
 return $one;
}
function getrow($query)
{
 if (false === stripos($query, 'COUNT(')) {
 if (false === stripos($query, 'WHERE')) {
 $query .= ' WHERE ROWNUM = 1';
 } else {
 $query .= ' AND ROWNUM = 1';
 }
 }
 $result = $this->getall($query, 0, 1);
 if (emptyempty($result))
 $row = array();
 else
 $row = $result[0];
 unset($result);
 return $row;
}

$total = $this->db->getcount($sql);
$result = $this->db->getpage($sql,$total,$page,$page_number);