fixes #21 SetSqlNode should remove comma before column name.

Author: harawata

src/main/java/org/apache/ibatis/scripting/xmltags/SetSqlNode.java

@@ -1,5 +1,5 @@
 /**
- *    Copyright 2009-2015 the original author or authors.
+ *    Copyright 2009-2018 the original author or authors.
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -15,7 +15,7 @@
  */
 package org.apache.ibatis.scripting.xmltags;
 
-import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 import org.apache.ibatis.session.Configuration;
@@ -25,10 +25,10 @@
  */
 public class SetSqlNode extends TrimSqlNode {
 
-  private static List<String> suffixList = Arrays.asList(",");
+  private static List<String> COMMA = Collections.singletonList(",");
 
   public SetSqlNode(Configuration configuration,SqlNode contents) {
-    super(configuration, contents, "SET", null, null, suffixList);
+    super(configuration, contents, "SET", COMMA, null, COMMA);
   }
 
 }

src/test/java/org/apache/ibatis/builder/xml/dynamic/DynamicSqlSourceTest.java

@@ -1,5 +1,5 @@
 /**
- *    Copyright 2009-2015 the original author or authors.
+ *    Copyright 2009-2018 the original author or authors.
  *
  *    Licensed under the Apache License, Version 2.0 (the "License");
  *    you may not use this file except in compliance with the License.
@@ -285,6 +285,18 @@ public void shouldTrimSETInsteadOfCOMMAForBothConditions() throws Exception {
     assertEquals(expected, boundSql.getSql());
   }
 
+  @Test
+  public void shouldTrimCommaAfterSET() throws Exception {
+    final String expected = "UPDATE BLOG SET  NAME = ?";
+    DynamicSqlSource source = createDynamicSqlSource(
+      new TextSqlNode("UPDATE BLOG"),
+      new SetSqlNode(new Configuration(), mixedContents(
+        new IfSqlNode(mixedContents(new TextSqlNode("ID = ?")), "false"),
+        new IfSqlNode(mixedContents(new TextSqlNode(", NAME = ?")), "true"))));
+    BoundSql boundSql = source.getBoundSql(null);
+    assertEquals(expected, boundSql.getSql());
+  }
+
   @Test
   public void shouldTrimNoSetClause() throws Exception {
     final String expected = "UPDATE BLOG";