From 655e6fb38fe60bf1338f05f05dea63bca563d552 Mon Sep 17 00:00:00 2001
From: thinkphp <thinkphp@qq.com>
Date: Wed, 31 Aug 2016 17:52:32 +0800
Subject: [PATCH] =?UTF-8?q?=E6=94=B9=E8=BF=9BQuery=E7=B1=BB=E7=9A=84?=
 =?UTF-8?q?=E6=9F=A5=E8=AF=A2=E6=96=B9=E6=B3=95?=
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---
 library/think/db/Query.php | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/library/think/db/Query.php b/library/think/db/Query.php
index a88fc13d..d42b83c5 100644
--- a/library/think/db/Query.php
+++ b/library/think/db/Query.php
@@ -908,9 +908,7 @@ class Query
                 $where = $field;
             } elseif ($field) {
                 // 字符串查询
-                $where[] = ['exp', $field];
-            } else {
-                $where = '';
+                $where[$field] = ['null', ''];
             }
         } elseif (is_array($op)) {
             $where[$field] = $param;