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  1. <?php
  2.  
  3. /*
  4.  * OIDplus 2.0
  5.  * Copyright 2019 - 2023 Daniel Marschall, ViaThinkSoft
  6.  *
  7.  * Licensed under the Apache License, Version 2.0 (the "License");
  8.  * you may not use this file except in compliance with the License.
  9.  * You may obtain a copy of the License at
  10.  *
  11.  *     http://www.apache.org/licenses/LICENSE-2.0
  12.  *
  13.  * Unless required by applicable law or agreed to in writing, software
  14.  * distributed under the License is distributed on an "AS IS" BASIS,
  15.  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16.  * See the License for the specific language governing permissions and
  17.  * limitations under the License.
  18.  */
  19.  
  20. namespace ViaThinkSoft\OIDplus;
  21.  
  22. // phpcs:disable PSR1.Files.SideEffects
  23. \defined('INSIDE_OIDPLUS') or die;
  24. // phpcs:enable PSR1.Files.SideEffects
  25.  
  26. class OIDplusQueryResultODBC extends OIDplusQueryResult {
  27.         /**
  28.          * @var bool
  29.          */
  30.         protected $no_resultset;
  31.  
  32.         /**
  33.          * @var mixed
  34.          */
  35.         protected $res;
  36.  
  37.         /**
  38.          * @param mixed $res
  39.          */
  40.         public function __construct($res) {
  41.                 $this->no_resultset = is_bool($res);
  42.  
  43.                 if (!$this->no_resultset) {
  44.                         $this->res = $res;
  45.  
  46.                         // Since caching prepared statements will cause the testcase "Simultanous prepared statements" to fail,
  47.                         // this will fix it.
  48.                         $this->prefetchAll();
  49.                 }
  50.         }
  51.  
  52.         /**
  53.          *
  54.          */
  55.         public function __destruct() {
  56.                 // odbc_close_cursor($this->res);
  57.         }
  58.  
  59.         /**
  60.          * @return bool
  61.          */
  62.         public function containsResultSet(): bool {
  63.                 return !$this->no_resultset;
  64.         }
  65.  
  66.         /**
  67.          * @return int
  68.          */
  69.         private function num_rows_workaround(): int {
  70.                 $dummy = array();
  71.  
  72.                 // go to the end of the result set
  73.                 $till_eof = 0;
  74.                 while ($temp = odbc_fetch_into($this->res, $dummy)) $till_eof++;
  75.  
  76.                 // reset cursor
  77.                 @odbc_fetch_row($this->res, 0);
  78.  
  79.                 // count the rows in the result set
  80.                 $ret = 0;
  81.                 while ($temp = odbc_fetch_into($this->res, $dummy)) $ret++;
  82.  
  83.                 // this would indicate that the odbc_fetch_row() could not reset the cursor
  84.                 if ($ret < $till_eof) return -1;
  85.  
  86.                 // go back to the row were started with
  87.                 @odbc_fetch_row($this->res, $ret-$till_eof);
  88.  
  89.                 return $ret;
  90.         }
  91.  
  92.         /**
  93.          * @return int
  94.          * @throws OIDplusException
  95.          */
  96.         protected function do_num_rows(): int {
  97.                 $ret = odbc_num_rows($this->res);
  98.  
  99.                 // Workaround for drivers that do not support odbc_num_rows (e.g. Microsoft Access)
  100.                 if ($ret === -1) $ret = $this->num_rows_workaround();
  101.  
  102.                 return $ret;
  103.         }
  104.  
  105.         /**
  106.          * Goes to the last result set (in case a query returns multiple result sets)
  107.          * @return void
  108.          */
  109.         protected function gotoLastResultSet() {
  110.                 while (@odbc_next_result($this->res)) {
  111.                         // Do nothing
  112.                 }
  113.         }
  114.  
  115.         /**
  116.          * @return array|null
  117.          */
  118.         protected function do_fetch_array()/*: ?array*/ {
  119.                 //$this->gotoLastResultSet(); // TODO: This causes problems (read dbms_version on null)
  120.                 $ret = @odbc_fetch_array($this->res);
  121.                 if ($ret === false) $ret = null;
  122.                 return $ret;
  123.         }
  124.  
  125.         /**
  126.          * @return object|null
  127.          */
  128.         protected function do_fetch_object()/*: ?object*/ {
  129.                 //$this->gotoLastResultSet(); // TODO: This causes problems (read dbms_version on null)
  130.                 $ret = @odbc_fetch_object($this->res);
  131.                 if ($ret === false) $ret = null;
  132.                 return $ret;
  133.         }
  134. }
  135.