Adding solution for The Last HR

week8/1-The-Last-HR/Database.sql

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+DROP TABLE IF EXISTS Students;
+
+CREATE TABLE Students(
+  student_id INTEGER PRIMARY KEY,
+  student_name TEXT,
+  student_github TEXT
+);
+
+DROP TABLE IF EXISTS Courses;
+
+CREATE TABLE Courses(
+  course_id INTEGER PRIMARY KEY,
+  course_name TEXT
+);
+
+DROP TABLE IF EXISTS Student_To_Course;
+
+CREATE TABLE Student_To_Course(
+  student_id INTEGER,
+  course_id INTEGER,
+  course_group INTEGER,
+  FOREIGN KEY(student_id) REFERENCES Students(student_id),
+  FOREIGN KEY(course_id) REFERENCES Courses(course_id)
+);

week8/1-The-Last-HR/Fill_Database.py

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+from Settings import DB_NAME, SQL_FILE
+import sqlite3
+import requests
+
+
+def connect():
+    connection = sqlite3.connect(DB_NAME)
+
+    with open(SQL_FILE, "r") as f:
+        connection.executescript(f.read())
+        connection.commit()
+
+    return connection
+
+
+def get_students(cursor, information):
+    get_students = [dict(student) for student in information]
+    for student in get_students:
+        cursor.execute("""
+            INSERT INTO Students(student_name, student_github) VALUES(?, ?)
+            """, (student['name'], student['github']))
+    return
+
+
+def get_courses(cursor, information):
+    courses_tuple = set()
+
+    get_courses = [course['courses'][0]['name']
+                   for course in information if len(course['courses']) > 0]
+    for course in get_courses:
+        courses_tuple.add(course)
+
+    for course in courses_tuple:
+        cursor.execute("""
+            INSERT INTO Courses(course_name) VALUES(?)
+            """, (course,))
+    return
+
+
+def student_to_course(cursor, information):
+    for student_id in information:
+        student_id = information.index(student_id)
+        get_course = information[student_id]['courses']
+        if len(get_course) > 0:
+            for course in get_course:
+                course_group = course['group']
+                course_id = cursor.execute("""
+                SELECT course_id FROM courses WHERE course_name = ?
+                """, (course['name'],))
+                course_id = course_id.fetchone()
+                if course_id is not None:
+                    cursor.execute("""
+                        INSERT INTO student_to_course(student_id, course_id, course_group)
+                        VALUES(?, ?, ?)""", (student_id, course_id[0], course_group))
+    return
+
+
+def main():
+    database = connect()
+    cursor = database.cursor()
+
+    request = requests.get('https://hackbulgaria.com/api/students/')
+    get_students(cursor, request.json())
+    get_courses(cursor, request.json())
+    student_to_course(cursor, request.json())
+
+    database.commit()
+
+
+if __name__ == '__main__':
+    main()

week8/1-The-Last-HR/Queries.py

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+import sqlite3
+
+connection = sqlite3.connect("Academy.db")
+cursor = connection.cursor()
+
+
+def list_students_github():
+    result = cursor.execute(
+        """SELECT student_name, student_github FROM students""")
+    return result
+
+
+def list_courses():
+    result = cursor.execute("""SELECT course_name FROM courses""")
+    return result
+
+
+def student_course():
+    result = cursor.execute("""
+    SELECT student_name,course_name
+    FROM students,courses
+    JOIN student_to_course
+    ON courses.course_id = student_to_course.course_id
+    AND students.student_id = student_to_course.student_id
+    """)
+    return result

week8/1-The-Last-HR/Settings.py

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+DB_NAME = "Academy.db"
+SQL_FILE = "Database.sql"