Merge pull request #110 from samz406/master

TENANT_NAME_EXIST 这里实际验证的是租户编码，不是租户名称是否唯一。

escheduler-api/src/main/java/cn/escheduler/api/enums/Status.java

@@ -31,7 +31,7 @@ public enum Status {
     HDFS_OPERATION_ERROR(10006, "hdfs operation error"),
     UPDATE_FAILED(10007, "updateProcessInstance failed"),
     TASK_INSTANCE_HOST_NOT_FOUND(10008, "task instance does not set host"),
-    TENANT_NAME_EXIST(10009, "tenant name already exists"),
+    TENANT_NAME_EXIST(10009, "tenant code already exists"),
     USER_NOT_EXIST(10010, "user {0} not exists"),
     ALERT_GROUP_NOT_EXIST(10011, "alarm group not found"),
     ALERT_GROUP_EXIST(10012, "alarm group already exists"),

escheduler-api/src/main/java/cn/escheduler/api/service/UsersService.java

@@ -216,6 +216,11 @@ public class UsersService extends BaseService {
         Date now = new Date();
 
         if (StringUtils.isNotEmpty(userName)) {
+            User tempUser = userMapper.queryByUserName(userName);
+            if (tempUser != null && tempUser.getId() != userId) {
+                putMsg(result, Status.USER_NAME_EXIST);
+                return result;
+            }
             user.setUserName(userName);
         }