From 3723ef3de94baf76ffbcdd569b1450330beb9c79 Mon Sep 17 00:00:00 2001
From: darren <yangdaiquan@deepleaper.com>
Date: Fri, 29 Oct 2021 17:21:40 +0800
Subject: [PATCH] fix https://github.com/mybatis-mapper/mapper/issues/13

(cherry picked from commit cadd366e052b04ba7a0458599fd806998f8416c4)
---
 .../main/java/io/mybatis/mapper/example/Example.java  | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/mapper/src/main/java/io/mybatis/mapper/example/Example.java b/mapper/src/main/java/io/mybatis/mapper/example/Example.java
index b92cb13..302c607 100644
--- a/mapper/src/main/java/io/mybatis/mapper/example/Example.java
+++ b/mapper/src/main/java/io/mybatis/mapper/example/Example.java
@@ -22,6 +22,9 @@
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
+import java.util.regex.Matcher;
+
+import static io.mybatis.provider.EntityTable.DELIMITER;
 
 /**
  * 通用的 Example 查询对象
@@ -130,7 +133,13 @@ public Example<T> selectColumns(Fn<T, Object>... fns) {
       if (column.equals(field) || entityColumn.entityTable().useResultMaps()) {
         selectColumns += column;
       } else {
-        selectColumns += column + " AS " + field;
+        Matcher matcher = DELIMITER.matcher(column);
+        //eg: mysql `order` == field order | sqlserver [order] == field order
+        if (matcher.find() && field.equals(matcher.group(1))) {
+          selectColumns += column;
+        } else {
+          selectColumns += column + " AS " + field;
+        }
       }
     }
     return this;