diff --git a/library/think/db/Connection.php b/library/think/db/Connection.php
index 784f858a..40263e49 100644
--- a/library/think/db/Connection.php
+++ b/library/think/db/Connection.php
@@ -286,7 +286,7 @@ abstract class Connection
                     Log::record($e->getMessage(), 'error');
                     return $this->connect($autoConnection, $linkNum);
                 } else {
-                    throw new Exception($e->getMessage());
+                    throw $e;
                 }
             }
         }
diff --git a/library/think/db/Query.php b/library/think/db/Query.php
index 5ddd89c0..dcf735b9 100644
--- a/library/think/db/Query.php
+++ b/library/think/db/Query.php
@@ -747,7 +747,7 @@ class Query
         }
 
         if (isset($this->options['field'])) {
-            $field = array_merge($this->options['field'], $field);
+            $field = $this->options['field'] + $field;
         }
         $this->options['field'] = $field;
         return $this;
@@ -1415,8 +1415,10 @@ class Query
     {
         $types = $this->getFieldsType($options);
         $bind  = [];
-        foreach ($types as $key => $type) {
-            $bind[$key] = $this->getFieldBindType($type);
+        if ($types) {
+            foreach ($types as $key => $type) {
+                $bind[$key] = $this->getFieldBindType($type);
+            }
         }
         return $bind;
     }