Hibernate Field Naming with Spring Boot

Issue: BAEL-2098

persistence-modules/spring-boot-persistence/src/main/java/com/baeldung/naming/HibernateConfig.java

@@ -0,0 +1,19 @@
+package com.baeldung.naming;
+
+import org.hibernate.jpa.boot.spi.IntegratorProvider;
+import org.springframework.boot.autoconfigure.orm.jpa.HibernatePropertiesCustomizer;
+
+import java.util.Collections;
+import java.util.Map;
+
+/**
+ * Custom implementation of the {@link HibernatePropertiesCustomizer HibernatePropertiesCustomizer}.
+ * We can use it to set custom hibernate properties.
+ */
+public class HibernateConfig implements HibernatePropertiesCustomizer {
+
+    @Override
+    public void customize(Map<String, Object> hibernateProperties) {
+        hibernateProperties.put("hibernate.integrator_provider", (IntegratorProvider) () -> Collections.singletonList(MetadataExtractorIntegrator.INSTANCE));
+    }
+}

persistence-modules/spring-boot-persistence/src/main/java/com/baeldung/naming/MetadataExtractorIntegrator.java

@@ -0,0 +1,41 @@
+package com.baeldung.naming;
+
+import org.hibernate.boot.Metadata;
+import org.hibernate.boot.model.relational.Database;
+import org.hibernate.engine.spi.SessionFactoryImplementor;
+import org.hibernate.integrator.spi.Integrator;
+import org.hibernate.service.spi.SessionFactoryServiceRegistry;
+
+/**
+ * Custom implementation of the {@link Integrator Integrator} interface.
+ * We can use it to getting access to the binding metadata between entity mappings and database tables.
+ */
+public class MetadataExtractorIntegrator implements Integrator {
+
+    public static final MetadataExtractorIntegrator INSTANCE = new MetadataExtractorIntegrator();
+
+    private Database database;
+
+    private Metadata metadata;
+
+    public Database getDatabase() {
+        return database;
+    }
+
+    public Metadata getMetadata() {
+        return metadata;
+    }
+
+    @Override
+    public void integrate(Metadata metadata, SessionFactoryImplementor sessionFactory, SessionFactoryServiceRegistry serviceRegistry) {
+
+        this.database = metadata.getDatabase();
+        this.metadata = metadata;
+
+    }
+
+    @Override
+    public void disintegrate(SessionFactoryImplementor sessionFactory, SessionFactoryServiceRegistry serviceRegistry) {
+
+    }
+}

persistence-modules/spring-boot-persistence/src/main/java/com/baeldung/naming/entity/Account.java

@@ -0,0 +1,19 @@
+package com.baeldung.naming.entity;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.OneToMany;
+import java.util.List;
+
+@Entity
+public class Account {
+
+    @Id private Long id;
+
+    private String defaultEmail;
+
+    @OneToMany List<Preference> preferences;
+
+    @Column(name = "\"Secondary_Email\"") private String secondaryEmail;
+}

persistence-modules/spring-boot-persistence/src/main/java/com/baeldung/naming/entity/Preference.java

@@ -0,0 +1,16 @@
+package com.baeldung.naming.entity;
+
+import javax.persistence.Entity;
+import javax.persistence.Id;
+import javax.persistence.ManyToOne;
+
+@Entity
+public class Preference {
+
+    @Id private Long id;
+
+    private String name;
+
+    @ManyToOne private Account account;
+
+}