Creational Design Patterns in Modern C++ - Using the Abstract Factory

The video tutorial explores various techniques for instantiating clauses from different databases. Initially, macros and conditional statements were used, but they had limitations. The factory method was introduced to reduce dependency on concrete clauses, but it couldn't ensure instances from a single database. The abstract factory design pattern was then implemented, allowing clients to create instances from different databases without depending on their concrete types. The video details the implementation process, including creating factory classes for SQL and MySQL databases, and demonstrates using the factory in the main function. The Singleton pattern ensures a single factory instance is used throughout the program.

What was a major limitation of using macros for instantiating clauses?

• They were not compatible with all databases.

• They required too much memory.

• They fixed the clauses at compile time.

• They were too complex to implement.

How did the factory method improve upon previous techniques?

• It allowed dynamic instantiation of clauses.

• It reduced dependency on concrete clauses.

• It eliminated the need for databases.

• It simplified the code structure.

What is the primary advantage of using the abstract factory design pattern?

• It allows for the creation of instances from multiple databases simultaneously.

• It ensures instances are created from a single database family.

• It simplifies the code by removing all factory methods.

• It increases the speed of database operations.

What is the role of the DB factory in the abstract factory pattern?

• To manage database connections.

• To execute SQL commands.

• To define the interface for creating instances.

• To store all database instances.

How does the abstract factory pattern ensure consistency in database instances?

• By using conditional statements.

• By hardcoding database types.

• By using a Singleton pattern for the factory.

• By using multiple factory instances.

What is a key benefit of using a Singleton pattern with the abstract factory?

• It increases the speed of database queries.

• It allows for multiple database connections.

• It ensures a single point of access for database instances.

• It reduces the complexity of the code.

Why is it impossible to get instances from different databases using the factory pointer?

• Because the factory pointer is limited to one database type.

• Because the factory pointer is not initialized.

• Because the factory pointer is deleted after use.

• Because the factory pointer is not compatible with multiple databases.