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55 - ===== Exam DAO, Database, JDBC, SQL ======/001 Exam task review and solution.mp4

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55 - ===== Exam DAO, Database, JDBC, SQL ======/001 Exam task review and solution_en.srt

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-Hello, Jim.
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-In this lesson, we're going to review the homework that will help you to practice your skills in using
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-Dolly Parton, even B, C and sequel and please, what is this lesson?
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-Because I'm sure this lesson will be super musical for you.
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-Why, I think so.
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-Because exactly in this media, I'm going to feel the gap between the theory and practice, and we'll
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-try to teach you structural thinking in order to achieve better architecture and software design.
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-In this lesson, I am going to share with you a lot of practical things that you wouldn't read on any
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-website and wouldn't find on any forum in the internet.
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-I wish somebody would explain the average student in a similar way when I just started the program.
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-So enjoys the video.
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-Also, if you are a student of my job, of course, you know that during the course we implement online
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-shop.
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-And in this homework, we're going to make the next step towards our goal.
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-Great web application of our online store today will improve our lives.
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-It is responsible for storing information in our app.
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-Let's start from reviewing the task first.
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-First of all, you need to download template of the app to your computer.
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-Here are provided templates application.
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-This is the latest version of our that with together with all students.
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-In case you want to implement the application from scratch or you want to become more familiar with
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-the functionality of the app just in case.
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-Here I also have a description of all functional requirements.
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-You can check them and implement that app by your own.
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-But still, I believe using the template is more than enough to achieve the goals of this homework.
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-Once you are able to run the solution locally, we're going to proceed with the next steps.
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-On the next step, you have to create tables in the database.
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-If you followed the course, then we created almost all necessary tablespoons.
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-Of course, you need just to create one more table and make some minor adjustments by adding additional
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-columns.
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-If you don't have any table created yet, create all necessary tables from scratch at the end of the
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-homework description.
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-Will provide you with the link to my data expert, and you will be able to include the same tables that
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-I have with the same data.
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-After that, you need to implement the types for that.
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-I want you to indentify which star types you have to create by yourself, because this is also part
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-of the task.
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-I will not tell you that you have to implement these these lenses now because this is super simple for
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-your level already.
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-But nevertheless, I will provide you was my solution and you will be able to find what types I create
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-together with no thoughts.
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-You need to create detail or types.
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-And one more important thing I recommend you to create converters between video and business entities.
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-I've explained why now and on example because data transfer objects are nothing more than a reflection
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-of the data from the database in Java objects.
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-But these objects are not true objects.
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-If you understand what I mean, zap pure data structures that don't have any behavior, while existing
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-business objects that are already created in the app may have some behavior.
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-Another point is that database table may contain dozens of rules, but not all the information from
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-each column may be used in existing business scenarios.
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-It might happen that some of the values are used just for consistency purposes.
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-As a column I used not so.
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-I choose a solution of business goals, but to solve some technical aspects of implementation.
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-That's why it is not always a guarantee that all information from the veto will be used in the app.
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-And last but not least, the argument to implement convergence between the data and models is isolation.
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-I will go now and in the future is to reduce coupling between modules.
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-We're about to introduce new persistence layer and instead of rewriting business models and business
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-logic of the app, what we do will is averaging like it was before to minimize the impact of adjustments
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-to make sure that the existing application will work like it's worked before.
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-But together with new persistence layer, we introduce convergence that can convert our digital objects
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-to existing business objects.
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-And in case we can take control over the process of converting objects into business objects and vice
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-versa.
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-And in this case, we can take control of the process of converting digital objects into business objects
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-and vice versa.
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-And now the important thing is the task implementation.
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-Do not hesitate to remove Java files that you see we don't need anymore.
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-We created this solution during the Java course.
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-And sometimes we separate that responsibility as much as we can for demo purposes.
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-Probably you can merge some types together, and some of them completely may be removed.
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-It is up to you.
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-Just want to highlight that during my solution to you are going to see some of the facts are made.
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-And as you may already understand, the main goal of this task is to make sure that our solution works
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-with database and use relational database as main persistent storage z sole task is that you have to
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-work on.
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-So now you can press a pause and start implementation of the task.
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-And when you will be done with implementation, you can review my solution.
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-Yeah.
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-Left reference to commands that contains all changes done.
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-But if you want to look at the solution as a whole, you can find all code of the solutions here.
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-Separately, I left here allocation of scripts in database in case you would like to record a state
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-of SAP.
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-And also let me hold quick walkthrough of the solution of the task.
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-So the first thing that I did, I created the types I didn't implement all across operations for the
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-purpose because usually I would keep records that I don't use and that I decided to rely only on the
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-business behavior and declare masses as it would allow to access just enough data to perform existing
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-business behavior.
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-How I did that, I looked at existing business there, and this application of business logic is concentrated
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-in services.
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-We have separate package was services here.
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-So what I did, I open the services, review them and created a downtimes that would help you to achieve
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-expected results.
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-Let me show you z on one example.
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-For example, the user management service.
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-Let's see what this service does.
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-It registers user.
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-What this means for me.
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-This means that during registration, users should be saved in the.
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-Database.
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-So in my user now I declare massive safe user.
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-But why isn't I don't use registered user as an interface of my DAO implementations?
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-The answer is simple and complex at the same time.
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-I don't use my service as a downer because this service is another layer of abstraction.
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-It isn't easy to understand at first glance, but let me try to explain.
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-And probably in many other languages, in larger price applications, you would ignore this.
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-But not many guys.
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-I'm going to teach you how to create scalable architecture.
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-So this course, user management service is a business there.
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-What does that mean?
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-This means that besides saving user, it is a database and lots of other things may happen.
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-User user registration.
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-What are the things, for example, user user registration you things may happen.
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-The most obvious one we store information about usernames and database.
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-Also, potentially, we sent a welcome email.
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-The user also dependent on the conditions of our affiliate program.
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-We need Three Flags that this user was registered by the reference of another user in order that the
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-user will receive bonuses in the future from the money spent by this user inside the application.
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-And these are just a few examples.
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-Registered user Behera describes some business case business behavior, and on the implementation level,
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-we define how this behavior will be implemented and saving user does it not base?
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-It is just one step means a user registration flow.
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-Do you feel my point now?
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-That's why I strongly recommend to keep this list separately.
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-You already know the benefits that we can get from the low koplan.
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-I wouldn't repeat myself.
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-I would just make a reference here to my in-laws, of course, is the school software architecture Anthony
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-called Design, where I explained and details the benefits of low Koplan and how to achieve scalable
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-architecture.
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-Words that course through if you wish this will extremely beneficial for all software engineers, regardless
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-programming language they use.
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-And similar case with other masses, for example, I have get users behavior in my service and I forget
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-users in my downtime.
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-But here's one more difference in user management service gets users returns a list of user objects,
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-but in mind now all of you get users massive returns, US list of user data objects.
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-Why is this is different?
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-I tried to explain this during a home task description, and I will remind you now.
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-So the detail object is data structure in very, very simplified words.
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-This is a reflection of all fields that the user table has in the database, and not all ways to solve.
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-Our business case is unique to you and data structures.
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-At the end of the day, we need to have places where to put objects related behavior, and this should
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-be business types, but not data structures.
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-Also, as I already said in detail, might be fields that are not used in business logic and exist just
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-to support data consistency.
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-By the way, having separate data and business objects, we can minimize impact and modification of
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-persistence systems.
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-And in a similar way, I analyze the business needs of the app and created the phrases for different
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-types.
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-After that, I had to implement these interfaces not since complex here.
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-Every scene is similar to the approach we discussed during our GDC lessons.
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-Probably the only one interested in seeing that we didn't discuss during lesson is auto generated is
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-usually rated by.
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-That's a base for the new top Ojo's insertion.
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-When this model needed imagines that the insurgents formation that you purchase is a database in one
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-table in purchased table.
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-But also you need to base Newt to oppose and purchase products that implement many, many relationships
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-between product and purchase entities and to implement this.
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-We need the base I.D. of generated purchase.
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-We can extract auto generated from the statement during the creation of the statement.
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-We have to parse that for auto generated case in safe purchase method.
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-We have this example, so you can see that I post custom value from statements close to the school return
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-generated case.
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-This is just a flat single int value, and once we execute this statement, we can get auto generated
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-piece by column yet generated case massive vehicle returns, a result set that will contain auto generated
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-key for each and set it up.
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-And we will use that key to insert trackers in purchase product table, as you can see, I execute this
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-insertions in watch to improve performance.
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-Basically, the rest of the scenes here should be familiar to you.
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-By the way, I remember it's one more thing I need all the management service and order entity into
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-purchase because order is a key word in the database and that is hard to use order as a database name.
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-That's why to address this challenge, I decided to use purchase terminology instead and renamed all
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-related files in our app here.
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-Also, I created Category Table is a database that contains only category name and I.D. because there's
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-a connection between product and category manager one.
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-Different products may be related was one Category two.
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-Implement this We also need to add foreign key in product.
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-Table three Establish connection between each product category.
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-Those are changes that they need in the database and also implements respective types in the app in
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-parallel by implementing different data types to reflect each database entity in Java in object oriented
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-way.
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-Nothing so much interesting here.
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-Just fields, getters and setters.
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-Separate package here is code converter.
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-This package contains all converters that I need in my app to convert your objects to business objects
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-and vice versa.
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-Let's review one of the example product detail converter in our application.
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-We also often work with collections of details and business models.
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-That's why it also makes sense for us to have an API that easily converts least of use the list of business
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-objects and vice versa.
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-Inside the masses, I basically create objects that I need and manually populate data.
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-Probably, you might be wondering why do we need so many classes?
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-It is crazy amount of classes, even on simple example.
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-You are right in some degree, but you always should understand the goals that we want to achieve.
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-Our goal is to make software designs that would allow us easily to scale our application when it will
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-be needed and one more interested in seeing the share such objects as d'etats converters may be auto
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-generated.
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-As you can see, Zen follows similar pattern, and this is also possible to write the code that will
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-auto generate classes like this.
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-Based on our entity's definition in such enterprise, the eCommerce solution as harbors from SAP similar
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-to generation is already implemented and during the build process, such kind of classes create automatically.
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-If you have enough time, you can also implement seamless sync because if you followed my job, of course
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-you already know what your affection is and you know how you can use it to dynamically explore a program
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-is around that.
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-The next thing that they did, I created new implementations of services, we have product management
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-service to products, we have purchase management service to manage purchases and we have user management
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-service to manage users.
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-These are existing interfaces.
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-I just gave them another mutation and created three new services.
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-ZF, the implementations injected into zone.
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-Let me open my school user management service here is registered user massive, not just use dot to
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-save user in the database.
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-It also returns error message in case something is going wrong.
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-For example, such emails already registered.
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-This is also some kind of business logic that couldn't be just moved to the door.
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-Can you understand that?
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-And besides that, some of the scenarios that are not implemented here but potentially can be like welcome
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-email notification or implementation of affiliate program, all this could potentially will be stored
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-here, but not in the.
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-That's why I want you scenes on these services, just designated locations to sit down objects and converters,
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-seek wine.
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-And the last scenes that we have to do is to inject our services inside our menus, right in our general
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-course.
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-I'm going to teach you how to use dependency injection in case we use dependency injection.
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-It is only a matter of consideration to set what concrete implementation of interface you want to inject
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-in one or another object.
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-In our case, we need to make these changes not in the configuration level, but still on the source
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-code level.
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-For example, in check out menu, I need to open it and initialize my service was another implementation
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-of the interface, and I did this for each menu.
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-After this is done, I can run my app and make sure that everything works as expected.
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-And by the way, you already know how to work with G-Unit and locate.
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-So never forget the right this to make sure that you didn't break Arneson hands of Amazon works as expected.
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-That's so what I wanted to share with you in the media, even in case you still have some questions,
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-please do not hesitate to -- in comments below this video since selecting for your attention.
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-Have a great day and see you in the next lesson.
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