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Transaction management ensures data consistency when performing multiple database operations. Let’s see how to handle transactions in Firebird with Spring Boot

1. Setting Up Firebird Connection

First, configure Firebird in your application.properties:
spring.datasource.url=jdbc:firebirdsql://localhost:3050/yourdb
spring.datasource.username=sysdba
spring.datasource.password=masterkey
spring.datasource.driver-class-name=org.firebirdsql.jdbc.FBDriver
spring.jpa.hibernate.ddl-auto=update
spring.jpa.database-platform=org.hibernate.dialect.FirebirdDialect
Spring Boot automatically manages the connection pool using this configuration

2. Enabling Transaction Management

Add the @EnableTransactionManagement annotation to your main class:
@SpringBootApplication
@EnableTransactionManagement
public class FirebirdApp {
  public static void main(String[] args) {
    SpringApplication.run(FirebirdApp.class, args);
  }
}
This enables declarative transaction handling across your application

3. Using @Transactional in Services

You can define transactions in service classes using the @Transactional annotation:

@Service
public class EmployeeService {

  @Autowired
  private EmployeeRepository repo;

  @Transactional
  public void updateSalaries(Long deptId, double increment) {
    repo.findByDepartmentId(deptId)
        .forEach(emp -> emp.setSalary(emp.getSalary() + increment));
  }
}
All updates inside this method will commit as one unit of work. If an exception occurs, the entire transaction rolls back automatically

4. Rollback Scenarios

You can customize rollback behavior:

@Transactional(rollbackFor = Exception.class)
public void transferFunds(Account from, Account to, double amount) {
  from.debit(amount);
  to.credit(amount);
  repo.save(from);
  repo.save(to);
}
If any exception is thrown, both save() operations will roll back, keeping the data consistent

5. Testing Transactions

Create integration tests to verify transaction behavior:

@SpringBootTest
@Transactional
public class TransactionTest {
  @Autowired
  private EmployeeService service;
}
Spring Boot will automatically start and rollback transactions during tests
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