修改查询的BUG

exam-work-api/src/main/java/cn/com/qmth/examcloud/service/examwork/service/ExamStudentService.java

@@ -465,13 +465,13 @@ public class ExamStudentService {
 			sql.append(" and t1.student_code LIKE '%"+examCriteria.getStudentCode()+"%'");
 	    }
 		if(!StringUtils.isEmpty(examCriteria.getCourseCode())){
-			sql.append(" and t1.course_code = "+examCriteria.getCourseCode());
+			sql.append(" and t1.course_code = '"+examCriteria.getCourseCode()+"'");
 		}
 		if(!StringUtils.isEmpty(examCriteria.getCourseLevel())){
-			sql.append(" and t1.course_level = "+examCriteria.getCourseLevel());
+			sql.append(" and t1.course_level = '"+examCriteria.getCourseLevel()+"'");
 		}
 		if(!StringUtils.isEmpty(examCriteria.getIdentityNumber())){
-			sql.append(" and t1.identity_number = "+examCriteria.getIdentityNumber());
+			sql.append(" and t1.identity_number LIKE '%"+examCriteria.getIdentityNumber()+"%'");
 		}
 		sql.append(" order by t1.id ");
 		return sql.toString();