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|
<?php
/**
+-----------------------------------------------------------------------+
| This file is part of the Roundcube Webmail client |
| Copyright (C) 2011-2014, Kolab Systems AG |
| |
| Licensed under the GNU General Public License version 3 or |
| any later version with exceptions for skins & plugins. |
| See the README file for a full license statement. |
| |
| PURPOSE: |
| Database wrapper class that implements PHP PDO functions |
| for Oracle database |
+-----------------------------------------------------------------------+
| Author: Aleksander Machniak <machniak@kolabsys.com> |
+-----------------------------------------------------------------------+
*/
/**
* Database independent query interface
* This is a wrapper for the PHP PDO
*
* @package Framework
* @subpackage Database
*/
class rcube_db_oracle extends rcube_db
{
public $db_provider = 'oracle';
/**
* Driver-specific configuration of database connection
*
* @param array $dsn DSN for DB connections
* @param PDO $dbh Connection handler
*/
protected function conn_configure($dsn, $dbh)
{
$dbh->query("ALTER SESSION SET nls_date_format = 'YYYY-MM-DD'");
$dbh->query("ALTER SESSION SET nls_timestamp_format = 'YYYY-MM-DD HH24:MI:SS'");
}
/**
* Get last inserted record ID
*
* @param string $table Table name (to find the incremented sequence)
*
* @return mixed ID or false on failure
*/
public function insert_id($table = null)
{
if (!$this->db_connected || $this->db_mode == 'r' || empty($table)) {
return false;
}
$sequence = $this->quote_identifier($this->sequence_name($table));
$result = $dbh->query("SELECT $sequence.currval FROM dual");
return $result ? $result->fetchColumn() : false;
}
/**
* Formats input so it can be safely used in a query
* PDO_OCI does not implement quote() method
*
* @param mixed $input Value to quote
* @param string $type Type of data (integer, bool, ident)
*
* @return string Quoted/converted string for use in query
*/
public function quote($input, $type = null)
{
// handle int directly for better performance
if ($type == 'integer' || $type == 'int') {
return intval($input);
}
if (is_null($input)) {
return 'NULL';
}
if ($type == 'ident') {
return $this->quote_identifier($input);
}
switch ($type) {
case 'bool':
case 'integer':
return intval($input);
default:
return "'" . strtr($input, array(
'?' => '??',
"'" => "''",
rcube_db::DEFAULT_QUOTE => rcube_db::DEFAULT_QUOTE . rcube_db::DEFAULT_QUOTE
)) . "'";
}
}
/**
* Return correct name for a specific database sequence
*
* @param string $table Table name
*
* @return string Translated sequence name
*/
protected function sequence_name($table)
{
// Note: we support only one sequence per table
// Note: The sequence name must be <table_name>_seq
$sequence = $table . '_seq';
// modify sequence name if prefix is configured
if ($prefix = $this->options['table_prefix']) {
return $prefix . $sequence;
}
return $sequence;
}
/**
* Return SQL statement for case insensitive LIKE
*
* @param string $column Field name
* @param string $value Search value
*
* @return string SQL statement to use in query
*/
public function ilike($column, $value)
{
return 'UPPER(' . $this->quote_identifier($column) . ') LIKE UPPER(' . $this->quote($value) . ')';
}
/**
* Return SQL function for current time and date
*
* @param int $interval Optional interval (in seconds) to add/subtract
*
* @return string SQL function to use in query
*/
public function now($interval = 0)
{
if ($interval) {
$interval = intval($interval);
return "current_timestamp + INTERVAL $interval SECOND";
}
return "current_timestamp";
}
/**
* Return SQL statement to convert a field value into a unix timestamp
*
* @param string $field Field name
*
* @return string SQL statement to use in query
* @deprecated
*/
public function unixtimestamp($field)
{
return "(($field - to_date('1970-01-01','YYYY-MM-DD')) * 60 * 60 * 24)";
}
/**
* Adds TOP (LIMIT,OFFSET) clause to the query
*
* @param string $query SQL query
* @param int $limit Number of rows
* @param int $offset Offset
*
* @return string SQL query
*/
protected function set_limit($query, $limit = 0, $offset = 0)
{
$limit = intval($limit);
$offset = intval($offset);
$end = $offset + $limit;
// @TODO: Oracle 12g has better OFFSET support
$orderby = stristr($query, 'ORDER BY');
$select = substr($query, 0, stripos($query, 'FROM'));
$offset += 1;
if ($orderby !== false) {
$query = trim(substr($query, 0, -1 * strlen($orderby)));
}
else {
// it shouldn't happen, paging without sorting has not much sense
// @FIXME: I don't know how to build paging query without ORDER BY
$orderby = "ORDER BY 1";
}
$query = preg_replace('/^SELECT\s/i', '', $query);
$query = "$select FROM (SELECT ROW_NUMBER() OVER ($orderby) AS row_number, $query)"
. " WHERE row_number BETWEEN $offset AND $end";
return $query;
}
/**
* Parse SQL file and fix table names according to table prefix
*/
protected function fix_table_names($sql)
{
if (!$this->options['table_prefix']) {
return $sql;
}
$sql = parent::fix_table_names($sql);
// replace sequence names, and other Oracle-specific commands
$sql = preg_replace_callback('/((SEQUENCE ["]?)([^" \r\n]+)/',
array($this, 'fix_table_names_callback'),
$sql
);
$sql = preg_replace_callback(
'/([ \r\n]+["]?)([^"\' \r\n\.]+)(["]?\.nextval)/',
array($this, 'fix_table_names_seq_callback'),
$sql
);
return $sql;
}
/**
* Preg_replace callback for fix_table_names()
*/
protected function fix_table_names_seq_callback($matches)
{
return $matches[1] . $this->options['table_prefix'] . $matches[2] . $matches[3];
}
/**
* Returns PDO DSN string from DSN array
*/
protected function dsn_string($dsn)
{
$params = array();
$result = 'oci:';
if ($dsn['hostspec']) {
$host = $dsn['hostspec'];
if ($dsn['port']) {
$host .= ':' . $dsn['port'];
}
$dsn['database'] = $host . '/' . $dsn['database'];
}
if ($dsn['database']) {
$params[] = 'dbname=' . $dsn['database'];
}
$params['charset'] = 'UTF8';
if (!empty($params)) {
$result .= implode(';', $params);
}
return $result;
}
}
|
