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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 = $res;
  45.                 }
  46.         }
  47.  
  48.         /**
  49.          *
  50.          */
  51.         public function __destruct() {
  52.                 // odbc_close_cursor($this->res);
  53.         }
  54.  
  55.         /**
  56.          * @return bool
  57.          */
  58.         public function containsResultSet(): bool {
  59.                 return !$this->no_resultset;
  60.         }
  61.  
  62.         /**
  63.          * @return int
  64.          */
  65.         private function num_rows_workaround(): int {
  66.                 $dummy = array();
  67.  
  68.                 // go to the end of the result set
  69.                 $till_eof = 0;
  70.                 while ($temp = odbc_fetch_into($this->res, $dummy)) $till_eof++;
  71.  
  72.                 // reset cursor
  73.                 @odbc_fetch_row($this->res, 0);
  74.  
  75.                 // count the rows in the result set
  76.                 $ret = 0;
  77.                 while ($temp = odbc_fetch_into($this->res, $dummy)) $ret++;
  78.  
  79.                 // this would indicate that the odbc_fetch_row() could not reset the cursor
  80.                 if ($ret < $till_eof) return -1;
  81.  
  82.                 // go back to the row were started with
  83.                 @odbc_fetch_row($this->res, $ret-$till_eof);
  84.  
  85.                 return $ret;
  86.         }
  87.  
  88.         /**
  89.          * @return int
  90.          * @throws OIDplusException
  91.          */
  92.         protected function do_num_rows(): int {
  93.                 $ret = odbc_num_rows($this->res);
  94.  
  95.                 // Workaround for drivers that do not support odbc_num_rows (e.g. Microsoft Access)
  96.                 if ($ret === -1) $ret = $this->num_rows_workaround();
  97.  
  98.                 return $ret;
  99.         }
  100.  
  101.         /**
  102.          * @return array|null
  103.          */
  104.         protected function do_fetch_array()/*: ?array*/ {
  105.                 $ret = odbc_fetch_array($this->res);
  106.                 if ($ret === false) $ret = null;
  107.                 return $ret;
  108.         }
  109.  
  110.         /**
  111.          * @return object|null
  112.          */
  113.         protected function do_fetch_object()/*: ?object*/ {
  114.                 $ret = odbc_fetch_object($this->res);
  115.                 if ($ret === false) $ret = null;
  116.                 return $ret;
  117.         }
  118. }
  119.