diff --git a/servers/boe-server-all/src/main/java/com/xboe/school/study/service/impl/StudyCourseServiceImpl.java b/servers/boe-server-all/src/main/java/com/xboe/school/study/service/impl/StudyCourseServiceImpl.java
index d4729cd5..234eaa51 100644
--- a/servers/boe-server-all/src/main/java/com/xboe/school/study/service/impl/StudyCourseServiceImpl.java
+++ b/servers/boe-server-all/src/main/java/com/xboe/school/study/service/impl/StudyCourseServiceImpl.java
@@ -418,7 +418,7 @@ public class StudyCourseServiceImpl implements IStudyCourseService{
 
 			}
 		}
-		if(StringUtils.isNotBlank(str)){
+		if(StringUtils.isNotBlank(str1)){
 			str1.deleteCharAt(str1.length()-1);
 		}
 
@@ -436,7 +436,7 @@ public class StudyCourseServiceImpl implements IStudyCourseService{
 //				StudyCourse sc=(StudyCourse)objs[0];
 				StudyCourse studyCourse = new StudyCourse();
 
-				studyCourse.setId(String.valueOf((BigInteger) objs[0]));
+				studyCourse.setId((String) objs[0]);
 				studyCourse.setCourseId((String) objs[1]);
 				studyCourse.setCourseType((Integer) objs[2]);
 				studyCourse.setCourseName((String) objs[3]);