Added increment/decrement functionality

Checks if string, not empty, and begins with basic operators

Author: WalterWoshid

src/Batch.php

@@ -73,8 +73,12 @@ public function update(Model $table, array $values, string $index = null, bool $
 
  foreach (array_keys($val) as $field) {
  if ($field !== $index) {
- $finalField = $raw ? Common::mysql_escape($val[$field]) : "'" . Common::mysql_escape($val[$field]) . "'";
- $value = (is_null($val[$field]) ? 'NULL' : $finalField);
+ if (gettype($val[$field]) == 'string' && !empty($val[$field]) && str_replace(['+', '-', '*', '/', '%'], '', $val[$field][0]) !== $val[$field][0]) {
+ $value = '`' . $field . '`' . $val[$field];
+ } else {
+ $finalField = $raw ? Common::mysql_escape($val[$field]) : "'" . Common::mysql_escape($val[$field]) . "'";
+ $value = (is_null($val[$field]) ? 'NULL' : $finalField);
+ }
  if ($driver == 'pgsql')
  $final[$field][] = 'WHEN ' . $index . ' = \'' . $val[$index] . '\' THEN ' . $value . ' ';
  else