From 4f3eed5cd22a0814bc77af1613e0b85a4a017cec Mon Sep 17 00:00:00 2001
From: FatttSnake <fatttsnake@gmail.com>
Date: Sun, 12 Jun 2022 20:08:05 +0800
Subject: [PATCH] Added selectFromAttendance(long stuID, long courID)

---
 .../library/database/DatabaseHelper.java      | 12 ++++++++++
 .../database/operation/AttendanceOA.java      | 23 +++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/Library/src/main/java/com/cfive/classroom/library/database/DatabaseHelper.java b/Library/src/main/java/com/cfive/classroom/library/database/DatabaseHelper.java
index 15fa7b8..0621024 100644
--- a/Library/src/main/java/com/cfive/classroom/library/database/DatabaseHelper.java
+++ b/Library/src/main/java/com/cfive/classroom/library/database/DatabaseHelper.java
@@ -726,6 +726,18 @@ public class DatabaseHelper {
         return AttendanceOA.select(attID);
     }
 
+    /**
+     * 通过学生编号和课程编号查询考勤
+     *
+     * @param stuID 学生编号
+     * @param courID 课程编号
+     * @return <code>Attendance</code> 考勤类
+     * @see Attendance
+     */
+    public static Attendance selectFromAttendance(long stuID, long courID) throws NoConfigException, SQLException {
+        return AttendanceOA.select(stuID, courID);
+    }
+
     /**
      * 插入考勤
      *
diff --git a/Library/src/main/java/com/cfive/classroom/library/database/operation/AttendanceOA.java b/Library/src/main/java/com/cfive/classroom/library/database/operation/AttendanceOA.java
index 9ce05d0..cc9d123 100644
--- a/Library/src/main/java/com/cfive/classroom/library/database/operation/AttendanceOA.java
+++ b/Library/src/main/java/com/cfive/classroom/library/database/operation/AttendanceOA.java
@@ -60,6 +60,29 @@ public class AttendanceOA {
         return null;
     }
 
+    public static Attendance select(long stuID, long courID) throws SQLException, NoConfigException {
+        String sql = "SELECT attID,attTime,attStatus,student.stuID,stuName,stuGender,student.passwd,student.salt,class.classID,grade,classNum,major.majorID,majorName,course.courID,courTimeFrom,courTimeEnd,subject.subID,subName,teacher.tchID,tchName,tchGender,teacher.passwd,teacher.salt,faculty.facID,facName FROM attendance,student,class,major,course,subject,teacher,faculty where attendance.courID=course.courID AND attendance.stuID=student.stuID AND class.classID=student.classID AND class.majorID=major.majorID AND major.facID=faculty.facID AND course.subID=subject.subID AND course.tchID=teacher.tchID AND teacher.facID=faculty.facID AND attendance.stuID=? AND attendance.courID=?";
+        try (Connection connection = PoolHelper.getConnection()) {
+            try (PreparedStatement preparedStatement = connection.prepareStatement(sql)) {
+                preparedStatement.setLong(1, stuID);
+                preparedStatement.setLong(2, courID);
+                try (ResultSet resultSet = preparedStatement.executeQuery()) {
+                    if (resultSet.next()) {
+                        Subject subject = new Subject(resultSet.getInt("subID"), resultSet.getString("subName"));
+                        Faculty faculty = new Faculty(resultSet.getInt("facID"), resultSet.getString("facName"));
+                        Teacher teacher = new Teacher(resultSet.getLong("tchID"), resultSet.getString("tchName"), resultSet.getString("tchGender").equals("m") ? Gender.m : Gender.f, faculty, resultSet.getString("teacher.passwd"), resultSet.getString("teacher.salt"));
+                        Course course = new Course(resultSet.getLong("courID"), subject, teacher, LocalDateTime.ofEpochSecond(resultSet.getTimestamp("courTimeFrom").getTime() / 1000, 0, ZoneOffset.of("+8")), LocalDateTime.ofEpochSecond(resultSet.getTimestamp("courTimeEnd").getTime() / 1000, 0, ZoneOffset.of("+8")));
+                        Major major = new Major(resultSet.getInt("majorID"), resultSet.getString("majorName"), faculty);
+                        AClass aClass = new AClass(resultSet.getLong("classID"), major, resultSet.getInt("grade"), resultSet.getInt("classNum"));
+                        Student student = new Student(resultSet.getLong("stuID"), resultSet.getString("stuName"), resultSet.getString("stuGender").equals("m") ? Gender.m : Gender.f, aClass, resultSet.getString("student.passwd"), resultSet.getString("student.salt"));
+                        return new Attendance(resultSet.getString("attID"), course, student, resultSet.getTimestamp("attTime") == null ? null : LocalDateTime.ofEpochSecond(resultSet.getTimestamp("attTime").getTime() / 1000, 0, ZoneOffset.of("+8")), AttStatus.fromString(resultSet.getString("attStatus")));
+                    }
+                }
+            }
+        }
+        return null;
+    }
+
     public static Attendance insert(long courID, long stuID, @Nullable LocalDateTime attTime, AttStatus attStatus) throws NoConfigException, SQLException, AlreadyExistsException, DependenciesNotFoundException, InsertException {
         if (!CourseOA.isExists(courID) || !StudentOA.isExists(stuID)) throw new DependenciesNotFoundException();