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ORDER BY name\",\n [className]\n );\n return result as Student[];\n}\n\nexport async function getStudentById(id: number): Promise {\n const result = await sqlite.execute(\n \"SELECT * FROM students WHERE id = ?\",\n [id]\n );\n return result.length > 0 ? result[0] as Student : null;\n}\n\nexport async function createStudent(student: CreateStudentRequest): Promise {\n const result = await sqlite.execute(\n \"INSERT INTO students (name, class, student_id) VALUES (?, ?, ?) RETURNING *\",\n [student.name, student.class, student.student_id]\n );\n return result[0] as Student;\n}\n\nexport async function updateStudent(student: UpdateStudentRequest): Promise {\n const updates: string[] = [];\n const values: any[] = [];\n\n if (student.name !== undefined) {\n updates.push(\"name = ?\");\n values.push(student.name);\n }\n if (student.class !== undefined) {\n updates.push(\"class = ?\");\n values.push(student.class);\n }\n if (student.student_id !== undefined) {\n updates.push(\"student_id = ?\");\n values.push(student.student_id);\n }\n\n if (updates.length === 0) {\n return await getStudentById(student.id);\n }\n\n values.push(student.id);\n \n const result = await sqlite.execute(\n `UPDATE students SET ${updates.join(\", \")} WHERE id = ? RETURNING *`,\n values\n );\n \n return result.length > 0 ? result[0] as Student : null;\n}\n\nexport async function deleteStudent(id: number): Promise {\n const result = await sqlite.execute(\n \"DELETE FROM students WHERE id = ?\",\n [id]\n );\n return result.length > 0;\n}\n\n// Attendance queries\nexport async function markAttendance(attendance: MarkAttendanceRequest): Promise {\n const result = await sqlite.execute(`\n INSERT INTO attendance_records (student_id, date, status, notes, updated_at)\n VALUES (?, ?, ?, ?, CURRENT_TIMESTAMP)\n ON CONFLICT(student_id, date) \n DO UPDATE SET \n status = excluded.status,\n notes = excluded.notes,\n updated_at = CURRENT_TIMESTAMP\n RETURNING *\n `, [attendance.student_id, attendance.date, attendance.status, attendance.notes || null]);\n \n return result[0] as AttendanceRecord;\n}\n\nexport async function getAttendanceByDate(date: string): Promise {\n const result = await sqlite.execute(`\n SELECT \n ar.*,\n s.name as student_name,\n s.class as student_class\n FROM attendance_records ar\n JOIN students s ON ar.student_id = s.id\n WHERE ar.date = ?\n ORDER BY s.class, s.name\n `, [date]);\n \n return result as AttendanceWithStudent[];\n}\n\nexport async function getAttendanceByStudent(studentId: number, startDate?: string, endDate?: string): Promise {\n let query = \"SELECT * FROM attendance_records WHERE student_id = ?\";\n const params: any[] = [studentId];\n\n if (startDate) {\n query += \" AND date >= ?\";\n params.push(startDate);\n }\n \n if (endDate) {\n query += \" AND date <= ?\";\n params.push(endDate);\n }\n\n query += \" ORDER BY date DESC\";\n\n const result = await sqlite.execute(query, params);\n return result as AttendanceRecord[];\n}\n\nexport async function getAttendanceStats(date: string, className?: string): Promise {\n let query = `\n SELECT \n COUNT(DISTINCT s.id) as total_students,\n COUNT(CASE WHEN ar.status = 'present' THEN 1 END) as present_count,\n COUNT(CASE WHEN ar.status = 'absent' THEN 1 END) as absent_count,\n COUNT(CASE WHEN ar.status = 'late' THEN 1 END) as late_count\n FROM students s\n LEFT JOIN attendance_records ar ON s.id = ar.student_id AND ar.date = ?\n `;\n \n const params: any[] = [date];\n\n if (className) {\n query += \" WHERE s.class = ?\";\n params.push(className);\n }\n\n const result = await sqlite.execute(query, params);\n const stats = result[0] as any;\n\n return {\n total_students: stats.total_students,\n present_count: stats.present_count || 0,\n absent_count: stats.absent_count || 0,\n late_count: stats.late_count || 0,\n attendance_rate: stats.total_students > 0 \n ? Math.round(((stats.present_count || 0) / stats.total_students) * 100)\n : 0\n };\n}\n\nexport async function getAttendanceReport(\n startDate: string, \n endDate: string, \n className?: string, \n studentId?: number\n): Promise {\n let query = `\n SELECT \n ar.*,\n s.name as student_name,\n s.class as student_class\n FROM attendance_records ar\n JOIN students s ON ar.student_id = s.id\n WHERE ar.date BETWEEN ? AND ?\n `;\n \n const params: any[] = [startDate, endDate];\n\n if (className) {\n query += \" AND s.class = ?\";\n params.push(className);\n }\n\n if (studentId) {\n query += \" AND s.id = ?\";\n params.push(studentId);\n }\n\n query += \" ORDER BY ar.date DESC, s.class, s.name\";\n\n const result = await sqlite.execute(query, params);\n return result as AttendanceWithStudent[];\n}\n\nexport async function getUniqueClasses(): Promise {\n const result = await sqlite.execute(\n \"SELECT DISTINCT class FROM students ORDER BY class\"\n );\n return result.map((row: any) => row.class);\n}","deleted","label",[170,171,153],"backend","database","permalink","https://www.val.town/x/mental/Att/code/backend/database/queries.ts","extension","actionData","errors"]