Add a class with the first sqlite implementetions (fix #30)

bin/database.py

@@ -0,0 +1,124 @@
+# import sqlite
+import sqlite3
+from sqlite3 import Error
+
+# create a database
+
+
+def create_sqlite_database(path):
+    """
+    Connect to a database by given a path as paramater
+    :param str path: String with the path + name of the database
+    """
+    connection = None
+    try:
+        connection = sqlite3.connect(path)
+        print("Connection to SQLite DB successful")
+    except Error as e:
+        print(f"The error '{e}' occurred")
+    return connection
+
+# create a database execute query function
+
+
+def execute_query(connection, query):
+    cursor = connection.cursor()
+    try:
+        cursor.execute(query)
+        connection.commit()
+        print("Query executed successfully")
+    except Error as e:
+        print(f"The error '{e}' occurred")
+
+# read a database
+
+
+def execute_read_query(connection, query):
+    cursor = connection.cursor()
+    result = None
+    try:
+        cursor.execute(query)
+        result = cursor.fetchall()
+        return result
+    except Error as e:
+        print(f"The error '{e}' occurred")
+
+
+def create_empty_database(database):
+    create_users_table_team = """
+    CREATE TABLE IF NOT EXISTS team (
+    TEAM_ID INTEGER PRIMARY KEY AUTOINCREMENT,
+    TEAM_NUMBER INTEGER NOT NULL,
+    TEAM_NAME TEXT NOT NULL,
+    TEAM_START TEXT NOT NULL,
+    TEAM_END TEXT NOT NULL
+    );
+    """
+    create_users_table_trainee = """
+    CREATE TABLE IF NOT EXISTS trainee (
+    TRAINEE_ID INTEGER PRIMARY KEY AUTOINCREMENT,
+    START_YEAR TEXT NOT NULL,
+    GRADUATION_YEAR INTEGER NOT NULL,
+    DATABASE_VERSION TEXT,
+    NUMBER_OF_TEAMS TEXT INTEGER,
+    DURATION NOT NULL INTEGER,
+    TEAM_ID NOT NULL INTEGER 
+    FOREIGN KEY(TEAM_ID) REFERENCES
+    );
+    """
+    create_users_table_entry = """
+    CREATE TABLE IF NOT EXISTS entry (
+    ENTRY_ID  INTEGER PRIMARY KEY AUTOINCREMENT,
+    ENTRY_TXT TEXT NOT NULL,
+    ENTRY_DATE TEXT NOT NULL ,
+    TRAINEE_ID INTEGER NOT NULL,
+    FOREIGN KEY(TRAINEE_ID) REFERENCES trainee(TRAINEE_ID)
+    );
+    """
+
+    # execute querys
+    execute_query(database, create_users_table_team)
+    execute_query(database, create_users_table_trainee)
+    execute_query(database, create_users_table_entry)
+
+
+class Database():
+    #
+    VERSION = 10
+
+    def __init__(self, path: str):
+
+        self.path = path
+        # Create database sqlite....
+        create_database = create_sqlite_database("database")
+        # create structure of database with required tables
+        create_empty_database(create_database)
+        # table entry, trainee and team has been created
+
+    def new_day(self):
+        """
+        """
+        sql = """CREATE DATABASE"""
+        self._execute_sql(sql)
+        return 0
+        # return an object for example...
+
+    def add_entry(self, day_id, entry_txt, entry_date):
+        """
+        """
+        return 0
+        # here we can return an object with which we can work on
+
+    def _execute_sql(self, sql_command):
+        """
+        """
+        # sql methods should be private
+        # _execute_sql  commands
+
+
+path = "database.sqlite"
+db = Database(path)
+day = db.new_day()
+text = "text_message"
+date = "DATE"
+db.add_entry(day, text, date)