Spring Database configuration - spring

Question

I have faced with one problem that made me crazy in its resolution. The problem is following: when I configure connection with my database in java class - it works good i.e. tables in DB are created corresponding to my classes names. BUT. When I try to use application.properties file instead java class configuration, everything what names tables properly is ignored and I`m confused what can I do with this issue(
For instance: I have a class named as 'ATMResearcher'. When I use java class to configure, there is an 'ATMResearcher' table in my database. But when my configuration properties are described in app.properties file (without using configuration class), then there is an 'atm_researcher' table in DB
I hope, anybody helps me. I provide screenshots of my config class and application.properties file below.
application.properties:
spring.datasource.url=jdbc:mysql://localhost:3306/someDB
spring.datasource.username=name
spring.datasource.password=password
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
spring.jpa.hibernate.ddl-auto=create
JpaConfig.java file:
#EnableJpaRepositories(basePackages = "repositories")
#Configuration
#EnableTransactionManagement
public class JpaConfig {
private LocalContainerEntityManagerFactoryBean entityManagerFactory() {
LocalContainerEntityManagerFactoryBean em
= new LocalContainerEntityManagerFactoryBean();
em.setDataSource(dataSource());
em.setPackagesToScan("entities");
JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
em.setJpaVendorAdapter(vendorAdapter);
em.setJpaProperties(additionalProperties());
return em;
}
private DataSource dataSource(){
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");
dataSource.setUrl("jdbc:mysql://localhost:3306/someDB");
dataSource.setUsername("name");
dataSource.setPassword("password");
return dataSource;
}
#Bean
public PlatformTransactionManager transactionManager(){
JpaTransactionManager transactionManager = new JpaTransactionManager();
transactionManager.setEntityManagerFactory((EntityManagerFactory) entityManagerFactory());
return transactionManager;
}
#Bean
public PersistenceExceptionTranslationPostProcessor exceptionTranslation(){
return new PersistenceExceptionTranslationPostProcessor();
}
private Properties additionalProperties() {
Properties properties = new Properties();
properties.setProperty("hibernate.hbm2ddl.auto", "create");
properties.setProperty(
"hibernate.dialect", "org.hibernate.dialect.MySQL5Dialect");
return properties;
}
}
ATMResearcher.java
#Data
#Entity(name = "ATMResearcher")
#Table(name = "ATMResearcher")
#NamedQueries({
#NamedQuery(name = ATMResearcher.findByAtm, query = "from ATMResearcher i where i.atm=:name")})
public class ATMResearcher implements Serializable {
private static final long serialVersionUID = 2046903428407635527L;
public static final String findBy = "researcherAtm.findByAtm";
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private long id;
private String researcher;
#ColumnDefault(value = "1")
private float volume;
#OneToMany(mappedBy = "atmReseacher", cascade = CascadeType.MERGE, targetEntity = ATMEval.class)
private Set<ATMEval> atmEval;
public String getShortName() {
return Arrays.stream(researcher.split(" ")).filter(n -> n.length() > 2)
.map(n -> n.substring(0, 1).toUpperCase()).collect(Collectors.joining());
}
#Override
public String toString() {
return "ATMResearcher{" +
"id=" + id +
", researcher='" + discipline + '\'' +
'}';
}
}

Answer 1

I think, you are missing this :
spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl
If it works, your properties should look like this:
spring.datasource.driverClassName=
spring.datasource.url=
spring.datasource.username=
spring.datasource.password=
spring.jpa.hibernate.ddl-auto=create
spring.jpa.database-platform=org.hibernate.dialect.MySQL8Dialect
spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl

Answer 2

Sorry but I don't really get it what you mean by "when I configure connection with my database in java class - it works good".
But when looking at you code there is something that you might have not seen yet.
You are using camelcase in you table name. This results in table name "atm_reasearch".
#Data
#Entity(name = "ATMResearcher")
#Table(name = "ATMResearcher")
Hope this solves your problem.

Answer 3

Hello you need to declare the naming strategies in your application.yml or properties file
By default spring will have such behaviour:
Replace dots with underscores
Change camel case to snake case
Lower-case table names
You should use JPA compliant standart
For JPA 1.0
spring:
jpa:
hibernate:
naming:
implicit-strategy: org.hibernate.boot.model.naming.ImplicitNamingStrategyLegacyJpaImpl
For JPA 2.0
spring:
jpa:
hibernate:
naming:
implicit-strategy: org.hibernate.boot.model.naming.ImplicitNamingStrategyJpaCompliantImpl
For having same names use physical strategy