d. Repository

Object-Relational Mapping (ORM) is a programming technique that allows developers to interact with a relational database using an object-oriented programming language. It provides a way to map database tables to classes and database records to objects, allowing developers to work with data in a more intuitive and natural way. In the context of the Account microservice, we will use an ORM framework to handle the data persistence for the Account entity, which will allow us to easily create, read, update, and delete accounts in the database.

Flyway is a database migration tool that allows us to manage and version our database schema changes. It provides a way to define and execute database migrations, which are scripts that modify the database schema, such as creating tables, adding columns, or changing data types. In the context of the Account microservice, we will use Flyway to manage our database migrations, ensuring that our database schema is always up-to-date and consistent across different environments.

📁 api/
└── 📁 account-service/
    ├── 📁 src/
    │   └── 📁 main/
    │       ├── 📁 java/
    │       │   └── 📁 store/
    │       │       └── 📁 account/
    │       │           ├──  Account.java
    │       │           ├──  AccountApplication.java
    │       │           ├──  AccountModel.java
    │       │           ├──  AccountParser.java
    │       │           ├──  AccountRepository.java
    │       │           ├──  AccountResource.java
    │       │           └──  AccountService.java
    │       └── 📁 resources/
    │           └──  application.yaml
    └──  pom.xml
Class Description
Account This class represents the Account entity, which is the main entity of the Account microservice. It contains the attributes of the Account entity, such as id, name, email, password, and sha256.
AccountModel This class represents the Account model, which is responsible for the persistence logic of the Account microservice. It contains the methods for creating, deleting, finding, and updating accounts.
AccountParser This class is responsible for parsing the input and output of the API endpoints, converting the AccountIn and AccountOut DTOs to the Account entity, and vice versa.
AccountRepository This interface is responsible for the data persistence of the Account entity, using an Object-Relational Mapping (ORM) framework to interact with the database.
AccountResource This class is responsible for the API endpoints of the Account microservice, implementing the AccountController interface defined in the account module, and using the AccountService to handle the business logic of the API endpoints.
AccountService This class is responsible for the business logic of the Account microservice, using the AccountRepository to handle the data persistence of the Account entity, and the AccountParser to handle the parsing of the input and output of the API endpoints.
AccountApplication This class is the main class of the Account microservice, which is responsible for running the Spring Boot application. It contains the main method, which is the entry point of the application.

Source

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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>4.0.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <groupId>store</groupId>
    <artifactId>account-service</artifactId>
    <version>1.0.0</version>
    <name>account-service</name>

    <properties>
        <java.version>25</java.version>
        <spring-cloud.version>2025.1.0</spring-cloud.version>
        <maven.compiler.proc>full</maven.compiler.proc>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-webmvc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>store</groupId>
            <artifactId>account</artifactId>
            <version>${project.version}</version>
        </dependency>

    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <annotationProcessorPaths>
                        <path>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </path>
                    </annotationProcessorPaths>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

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  1. Criando Migrations com Flyway no seu projeto Java Spring & PostgreSQL ↩