database: files id and chdates are stored

- mysql creates database and tables to given mysql if not existent already
- mysql reads last change values from db
- mysql saves ch_date after downloading
- run now takes care for the variables of mysql and studip

src/mysql.py

@@ -0,0 +1,64 @@
+#!/bin/env python3
+import time
+
+import pymysql
+
+
+class Database:
+
+    def __init__(self):
+        self.HOST = None
+        self.PORT = None
+        self.DB_NAME = None
+        self.USER = None
+        self.PASSW = None
+        self.TABLE_FILE = None
+        self.TABLE_FILE = 'files'
+        self.RESET_DL_DATE = False
+
+    def connect(self):
+        return pymysql.connect(
+            host=self.HOST,
+            port=self.PORT,
+            user=self.USER,
+            password=self.PASSW,
+            charset='utf8mb4',
+            cursorclass=pymysql.cursors.DictCursor
+        )
+
+    def setup_db(self):
+        db = self.connect()
+        crs = db.cursor()
+        sql_query = "CREATE DATABASE IF NOT EXISTS " + self.DB_NAME
+        crs.execute(sql_query)
+        db.select_db(self.DB_NAME)
+        query = "CREATE TABLE IF NOT EXISTS " + self.TABLE_FILE + \
+            "(id CHAR(32) NOT NULL," + \
+            "ch_date INT(11) NOT NULL," + \
+            "PRIMARY KEY(id))"
+        crs.execute(query)
+        print(db)
+
+    def set_last_file_dl(self, file_id, time):
+        db = self.connect()
+        db.select_db(self.DB_NAME)
+        crs = db.cursor()
+        print('file: ', file_id, ' time: ', time)
+        query = "INSERT INTO " + self.TABLE_FILE + "(`id`,`ch_date`)" + \
+                "VALUES ('" + file_id + "','" + time + "')" + \
+                "ON DUPLICATE KEY UPDATE `ch_date` = '" + time + "'"
+        crs.execute(query)
+        db.commit()
+
+    def get_last_file_dl(self, file_id):
+        if self.RESET_DL_DATE:
+            return None
+        db = self.connect()
+        db.select_db(self.DB_NAME)
+        crs = db.cursor()
+        query = "SELECT ch_date FROM files WHERE id ='" + file_id + "'"
+        crs.execute(query)
+        res = crs.fetchone()
+        if res != None:
+            return res['ch_date']
+        return None