diff --git a/library/think/db/Builder.php b/library/think/db/Builder.php
index 8a10e2c8..933c3b5d 100644
--- a/library/think/db/Builder.php
+++ b/library/think/db/Builder.php
@@ -85,7 +85,7 @@ abstract class Builder
         if ('*' == $options['field']) {
             $fields = array_keys($bind);
         } else {
-            $fields = is_array($options['field']) ? $options['field'] : array_map('trim', explode(',', $options['field']));
+            $fields = $options['field'];
         }
 
         $result = [];
@@ -567,7 +567,7 @@ abstract class Builder
         if ('*' == $options['field']) {
             $fields = $this->query->getTableInfo($options['table'], 'fields');
         } else {
-            $fields = is_array($options['field']) ? $options['field'] : array_map('trim', explode(',', $options['field']));
+            $fields = $options['field'];
         }
 
         foreach ($dataSet as &$data) {
diff --git a/library/think/db/Query.php b/library/think/db/Query.php
index 0d09d17b..8c3fe9bf 100644
--- a/library/think/db/Query.php
+++ b/library/think/db/Query.php
@@ -602,12 +602,12 @@ class Query
             return $this;
         }
         if (is_string($field)) {
-            $field = explode(',', $field);
+            $field = array_map('trim', explode(',', $field));
         }
         if (true === $field) {
             // 获取全部字段
             $fields = $this->getTableInfo($tableName, 'fields');
-            $field  = $fields ?: '*';
+            $field  = $fields ?: ['*'];
         } elseif ($except) {
             // 字段排除
             $fields = $this->getTableInfo($tableName, 'fields');