import psycopg2


class PostgreSQLDatabase:
    def __init__(self, host, database, user, password):
        self.__host = host
        self.__database = database
        self.__user = user
        self.__password = password

    def execute_query(self, query):
        connection = psycopg2.connect(
            host=self.__host,
            database=self.__database,
            user=self.__user,
            password=self.__password
        )
        cursor = connection.cursor()
        cursor.execute(query)
        result = cursor.fetchall()
        cursor.close()
        connection.close()
        return result