litemall-db模块更新：

1. mybatis generator更新1.3.7
2. mybatis-generator-plugin更新1.2.12
3. 更新所有自动生成代码
4. OrderMapper,实现基于update_time的乐观锁更新

litemall-db/src/main/java/org/linlinjava/litemall/db/service/LitemallAdService.java

@@ -8,6 +8,7 @@ import org.springframework.stereotype.Service;
 import org.springframework.util.StringUtils;
 
 import javax.annotation.Resource;
+import java.time.LocalDateTime;
 import java.util.List;
 
 @Service
@@ -57,6 +58,7 @@ public class LitemallAdService {
     }
 
     public int updateById(LitemallAd ad) {
+        ad.setUpdateTime(LocalDateTime.now());
         return adMapper.updateByPrimaryKeySelective(ad);
     }
 
@@ -65,6 +67,8 @@ public class LitemallAdService {
     }
 
     public void add(LitemallAd ad) {
+        ad.setAddTime(LocalDateTime.now());
+        ad.setUpdateTime(LocalDateTime.now());
         adMapper.insertSelective(ad);
     }