改进数据库操作join自身后出错的问题

library/think/db/Builder.php

@@ -183,6 +183,9 @@ abstract class Builder
         $item = [];
         foreach ((array) $tables as $key => $table) {
             if (!is_numeric($key)) {
+                if (strpos($key, '@think')) {
+                    $key = strstr($key, '@think', true);
+                }
                 $key    = $this->parseSqlTable($key);
                 $item[] = $this->parseKey($key) . ' ' . $this->parseKey($table);
             } else {

library/think/db/Query.php

@@ -716,6 +716,9 @@ class Query
             }
         }
         if (isset($alias)) {
+            if (isset($this->options['alias'][$table])) {
+                $table = $table . '@think' . uniqid();
+            }
             $table = [$table => $alias];
             $this->alias($table);
         }