活动排课

mec-biz/src/main/java/com/ym/mec/biz/dal/entity/ClassGroup.java

@@ -205,6 +205,9 @@ public class ClassGroup {
 	}
 
 	public void setStudentNum(Integer studentNum) {
+		if(studentNum == null || studentNum < 0){
+			studentNum = 0;
+		}
 		this.studentNum = studentNum;
 	}