PHP实现的oracle分页函数实例
这篇文章主要介绍了PHP实现的oracle分页函数,结合实例形式分析了PHP针对oracle数据库使用rownum代替MySQL中limit实现的分页操作相关技巧,需要的朋友可以参考下
本文实例讲述了PHP实现的oracle分页函数,分享给大家供大家参考,具体如下:
mysql有limit,分页的时候,我们可以用limit 30,40,而oracle没有limit,用其他的方法来代替--rownum.
一、底层方法
- /**
- * 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) ? $this->connect() : $this->dbh;
- $this->sth = oci_parse($this->dbh, $query);
- oci_execute($this->sth, OCI_DEFAULT) or $this->error($this->sth, $query);
- oci_fetch_all($this->sth, $res, $start, $rows, OCI_FETCHSTATEMENT_BY_ROW+OCI_ASSOC);
- return $res;
- }
- /**
- * 获取分页数
- *
- * $query string 查询语句
- * $total int 总条数
- * $page int 页数
- * $rows int 每页显示数
- * @return integer 总行数
- */
- function getpage($query, $total, $page, $rows=VAR_PAGENAV_ROWS)
- {
- $start_row = ($page - 1) * $rows + 1;
- $start_row = $start_row > $total ? 1 : $start_row;
- $end_row = $start_row + $rows - 1;
- $end_row = $end_row > $total ? $total : $end_row;
- $query = "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;
- }
主要二个方法我写一点注释
二、调用方法
$total = $this->db->getcount($sql);
$result = $this->db->getpage($sql,$total,$page,$page_number);
上面只是贴出部分代码,也是最核心的。