From e60f497bd639fcd24edabc0148a74b0562e9522d Mon Sep 17 00:00:00 2001
From: thinkphp <thinkphp@qq.com>
Date: Sat, 9 Apr 2016 15:13:25 +0800
Subject: [PATCH] =?UTF-8?q?Model=E7=B1=BB=E5=A2=9E=E5=8A=A0getPk=E6=96=B9?=
 =?UTF-8?q?=E6=B3=95=E7=94=A8=E4=BA=8E=E8=8E=B7=E5=8F=96=E4=B8=BB=E9=94=AE?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 library/think/Model.php | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/library/think/Model.php b/library/think/Model.php
index 2dd92f36..117a3fb0 100644
--- a/library/think/Model.php
+++ b/library/think/Model.php
@@ -316,11 +316,10 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
      */
     public function getPk($tableName = '')
     {
-        if ($this->pk) {
-            return $this->pk;
-        } else {
-            return self::db()->getTableInfo($tableName, 'pk');
+        if (!$this->pk) {
+            $this->pk = self::db()->getTableInfo($tableName, 'pk');
         }
+        return $this->pk;
     }
 
     /**