From 47bfd562fee765c5613f41245945aeaa3445caa9 Mon Sep 17 00:00:00 2001
From: Jim Liu <hldh214@Gmail.com>
Date: Sun, 29 Jan 2017 17:24:06 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E5=A4=8D=E9=97=AD=E5=8C=85=E6=9F=A5?=
 =?UTF-8?q?=E8=AF=A2=E6=9D=A1=E4=BB=B6=E4=B8=BA=E7=A9=BA=E5=AF=BC=E8=87=B4?=
 =?UTF-8?q?=E7=9A=84=20sql=20=E8=AF=AD=E6=B3=95=E9=94=99=E8=AF=AF?=
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Content-Type: text/plain; charset=UTF-8
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---
 library/think/db/Builder.php | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/library/think/db/Builder.php b/library/think/db/Builder.php
index 380fe239..9034076e 100644
--- a/library/think/db/Builder.php
+++ b/library/think/db/Builder.php
@@ -250,7 +250,10 @@ abstract class Builder
                     // 使用闭包查询
                     $query = new Query($this->connection);
                     call_user_func_array($value, [ & $query]);
-                    $str[] = ' ' . $key . ' ( ' . $this->buildWhere($query->getOptions('where'), $options) . ' )';
+                    $whereClause = $this->buildWhere($query->getOptions('where'), $options);
+                    if (!empty($whereClause)) {
+                        $str[] = ' ' . $key . ' ( ' . $whereClause . ' )';
+                    }
                 } elseif (strpos($field, '|')) {
                     // 不同字段使用相同查询条件（OR）
                     $array = explode('|', $field);