Spring Boot - Use underscored table and column names for custom data source - spring

Question

I am trying to configure two data sources for a Spring Boot project. Here is my configuration file for primary data source.
#PropertySource({"classpath:application-local.properties"})
#Configuration
#EnableTransactionManagement
#EnableJpaRepositories(
entityManagerFactoryRef = "primaryEntityManager",
basePackages = {"portal.api.repository"}
)
public class PrimaryDbConfig {
#Autowired
private Environment env;
#Bean
#Primary
public LocalContainerEntityManagerFactoryBean primaryEntityManager() {
LocalContainerEntityManagerFactoryBean em
= new LocalContainerEntityManagerFactoryBean();
em.setDataSource(primaryDataSource());
em.setPackagesToScan(
new String[]{"portal.api.model"});
HibernateJpaVendorAdapter vendorAdapter
= new HibernateJpaVendorAdapter();
em.setJpaVendorAdapter(vendorAdapter);
HashMap<String, Object> properties = new HashMap<>();
properties.put("hibernate.hbm2ddl.auto",
env.getProperty("app.datasource.spring.jpa.hibernate.ddl"));
properties.put("hibernate.dialect",
env.getProperty("hibernate.dialect"));
em.setJpaPropertyMap(properties);
return em;
}
#Primary
#Bean
public DataSource primaryDataSource() {
DriverManagerDataSource dataSource
= new DriverManagerDataSource();
dataSource.setDriverClassName(
env.getProperty("app.datasource.driver-class-name"));
dataSource.setUrl(env.getProperty("app.datasource.url"));
dataSource.setUsername(env.getProperty("app.datasource.username"));
dataSource.setPassword(env.getProperty("app.datasource.password"));
return dataSource;
}
#Primary
#Bean
public PlatformTransactionManager userTransactionManager() {
JpaTransactionManager transactionManager
= new JpaTransactionManager();
transactionManager.setEntityManagerFactory(
primaryEntityManager().getObject());
return transactionManager;
}
}
The tables are generated but their names and column names are in camel case. However I would like to have the underscore names which spring boot has by default. For example ApiKey entity would be changed to table name api_key.
How do I configure Spring Boot to use the underscored naming strategy?

Answer 1

I think if you use #Column(name = "api_key") in your instance variable for your domain model it'll work.
e.g.
#Column(name = "api_key")
private String apiKey;

Answer 2

Reference from Official doc
By default, Spring Boot configures the physical naming strategy with
SpringPhysicalNamingStrategy. This implementation provides the same
table structure as Hibernate 4: all dots are replaced by underscores
and camel casing is replaced by underscores as well.
You can set the following property in application.yml to tell springboot which naming strategy to use:
spring:
jpa:
hibernate:
naming:
physical-strategy: org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl
implicit-strategy: org.hibernate.boot.model.naming.ImplicitNamingStrategyLegacyJpaImpl
Similar post for reference:
java.sql.SQLSyntaxErrorException: Unknown column .JPA Entity Issue?