Example of oracle paging function implemented in PHP_php skills

The example in this article describes the oracle paging function implemented in PHP. Share it with everyone for your reference, the details are as follows:

MySQL has a limit. When paging, we can use limit 30, 40, but Oracle does not have a limit. Use other methods instead - rownum.

1. Underlying methods

/**
 * 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;
}

I will write some comments on the two main methods

2. Calling method

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

Only part of the code is posted above, which is also the core.

Readers who are interested in more content related to PHP database operations can check out the special topics of this site: "Summary of common PHP database operation skills", "Summary of PHP database operation skills based on pdo ” and “Introduction Tutorial on PHP MySQL Database Operation”.

I hope this article will be helpful to everyone in PHP programming.