Spring Data JPA column 駝峯與下劃線的轉化

使用Spring data jpa 時，表字段（user_id）與實體（userId）不能對應，須要添加如下配置

參考：https://www.jianshu.com/p/fc2c79814956

峯與下劃線的轉化 通用配置：

application.properties 配置

無修改命名

spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl

遇到大寫加下劃線"_" 的命名

spring.jpa.hibernate.naming.physical-strategy=org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy

若是項目中使用的表既有下劃線，又有駝峯，並且還不想使用@Column一個個標識：

application.properties

spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl

ReceptionDBConfig.class

// 配置字段
protected Map<String, Object> jpaProperties() {
        Map<String, Object> props = new HashMap<>();
        props.put("hibernate.physical_naming_strategy", SpringPhysicalNamingStrategy.class.getName());
        props.put("hibernate.implicit_naming_strategy", SpringImplicitNamingStrategy.class.getName());
        return props;
    }

@Bean(name = "receptionEntityManagerFactory")
    public LocalContainerEntityManagerFactoryBean kcEntityManagerFactory(EntityManagerFactoryBuilder builder,
            @Qualifier("receptionDataSource") DataSource dataSource) {
        return builder.dataSource(dataSource).packages("com.icil.elsa.milestone.query.entities.reception")
                .persistenceUnit("reception")
                .properties(jpaProperties())  // 引入屬性配置
                .build();
    }