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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;
+ }
+}