BaseAdapter: fix ANSI SQL identifier quoting

src/Adapter/BaseAdapter.php

@@ -1,3 +1,3 @@
 <?php
 
 namespace ipl\Sql\Adapter;
@@ -24,7 +24,7 @@
     protected array $quoteCharacter = ['"', '"'];
 
     /** @var string Character to use for escaping quote characters */
-    protected string $escapeCharacter = '\\"';
+    protected string $escapeCharacter = '""';
 
     /** @var array Default PDO connect options */
     protected array $options = [
@@ -52,7 +52,7 @@
 
     public function getOptions(Config $config): array
     {
         if (is_array($config->options)) {
             return $config->options + $this->options;
         }
 
@@ -75,8 +75,8 @@
                 continue;
             }
 
             $identifiers[$i] = $this->quoteCharacter[0]
                 . str_replace($this->quoteCharacter[0], $this->escapeCharacter, $identifier)
                 . $this->quoteCharacter[1];
         }
 
@@ -87,15 +87,15 @@
     {
         $queryBuilder->on(QueryBuilder::ON_ASSEMBLE_SELECT, function (Select $select): void {
             if ($select->hasOrderBy()) {
                 foreach ($select->getOrderBy() as [$_, $direction]) {
                     switch (strtolower($direction ?? '')) {
                         case '':
                         case 'asc':
                         case 'desc':
                             break;
                         default:
                             throw new UnexpectedValueException(
                                 sprintf('Invalid direction "%s" in ORDER BY', $direction)
                             );
                     }
                 }