Subversion Repositories oidplus

<?php

/*

 * OIDplus 2.0

 * Copyright 2019 - 2022 Daniel Marschall, ViaThinkSoft

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

namespace ViaThinkSoft\OIDplus;

class OIDplusSqlSlangPluginOracle extends OIDplusSqlSlangPlugin {

        public static function id(): string {

                return 'oracle';

        }

        public function natOrder($fieldname, $order='asc'): string {

                $order = strtolower($order);

                if (($order != 'asc') && ($order != 'desc')) {

                        throw new OIDplusException(_L('Invalid order "%1" (needs to be "asc" or "desc")',$order));

                }

                $out = array();

                $max_arc_len = OIDplus::baseConfig()->getValue('LIMITS_MAX_OID_ARC_SIZE') > 65 ? 65 : OIDplus::baseConfig()->getValue('LIMITS_MAX_OID_ARC_SIZE'); // Limit of "decimal()" type

                // 1. sort by namespace (oid, guid, ...)

                $out[] = "regexp_substr($fieldname, '(.*?)(:|\$)', 1, 1, NULL, 1) $order";

                // 2. sort by first arc (0,1,2)

                $tmp = "regexp_substr($fieldname, '(.*?)(:|\$)', 1, 2, NULL, 1)";

                $i = 1;

                $out[] = "lpad(regexp_substr($tmp, '(.*?)(\\.|\$)', 1, $i, NULL, 1),$max_arc_len,'0') $order";

                for ($i=2; $i<=OIDplus::baseConfig()->getValue('LIMITS_MAX_OID_DEPTH'); $i++) {

                        // 3. Sort by the rest arcs one by one, not that MySQL can only handle decimal(65), not decimal($max_arc_len)

                        $out[] = "lpad(regexp_substr($fieldname, '(.*?)(\\.|\$)', 1, $i, NULL, 1),$max_arc_len,'0') $order";

                }

                // 4. as last resort, sort by the identifier itself, e.g. if the casts above did fail (happens if it is not an OID)

                $out[] = "$fieldname $order";

                return implode(', ', $out);

        }

        public function sqlDate(): string {

                return 'SYSDATE';

        }

        public function detect(OIDplusDatabaseConnection $db): bool {

                try {

                        $vers = $db->query("SELECT banner FROM v\$version WHERE banner LIKE 'Oracle%'")->fetch_object()->banner;

                        $vers = strtolower($vers);

                        return (strpos($vers, 'oracle') !== false);

                } catch (\Exception $e) {

                        return false;

                }

        }

        private $last_insert_table = null;

        public function insert_id(OIDplusDatabaseConnection $db): int {

                if (!$this->last_insert_table) return 0;

                $res = $db->query("select sequence_name from user_tab_identity_cols where table_name = '".strtoupper($this->last_insert_table)."'");

                $row = $res->fetch_array();

                if (!isset($row['sequence_name'])) return 0;

                $res = $db->query("select ".$row['sequence_name'].".currval from dual");

                $row = $res->fetch_array();

                return (int)$row['CURRVAL'];

        }

        public function setupSetTablePrefix($cont, $table, $prefix): string {

                $table = strtoupper($table);

                $prefix = strtoupper($prefix);

                $cont = str_replace('"'.$table.'"', '"'.$prefix.$table.'"', $cont);

                return $cont;

        }

        public function setupCreateDbIfNotExists($database): string {

                // TODO! Implement

                return "";

        }

        public function setupUseDatabase($database): string {

                // TODO! Implement

                return "";

        }

        public function isNullFunction($expr1, $expr2): string {

                // Test via "SELECT NVL(null, 'foo') FROM DUAL;"

                return "NVL($expr1, $expr2)";

        }

        public function filterQuery($sql): string {

                // "select 1" is not valid. You need to add "from dual"

                if ((stripos($sql,'select') !== false) && (stripos($sql,'from') === false)) {

                        $sql .= ' from dual';

                }

                // SQL-Queries MUST NOT end with a ";", otherwise error "SQL command not property ended"

                $sql = rtrim(trim($sql), "; \n\r\t\v\x00");

                // SQL/PL-Programs MUST end with a ";"

                if (strtolower(substr($sql,-3)) == 'end') $sql .= ';';

                // Dirty hack!!! We need the name of the last inserted table so that insert_id()

                // works. This is a dirty hack, because the invokation of filterQuery() does

                // not guarantee that the query was actually executed...

                if (preg_match("@insert into (.+) @ismU", $sql, $m)) {

                        $this->last_insert_table = $m[1];

                } else {

                        $this->last_insert_table = null;

                }

                // Comment is a keyword and cannot be used as column name

                $sql = str_ireplace('comment', '"COMMENT"', $sql);

                return $sql;

        }

        public function getSQLBool($bool): string {

                return $bool ? '1' : '0';

        }

        public function escapeString($str): string {

                return str_replace("'", "''", $str);

        }

}