JPA Hibernate 驼峰式字段

Posted 2023-02-26

【中文标题】JPA Hibernate 驼峰式字段

【英文标题】：JPA Hibernate camelcase field

【发布时间】：2016-06-12 08:22:05

【问题描述】：

我有 spring 4+ hibernate 4.3 + psql 9.5 应用程序，遇到了一些驼峰式字段转换的问题。

Hibernate: select trainservi0_.trainServiceId as trainSer1_16_, trainservi0_.category as category2_16_, trainservi0_.date as date3_16_, trainservi0_.description as descript4_16_, trainservi0_.name as name5_16_, trainservi0_.status as status6_16_, trainservi0_.trainNumber as trainNum7_16_, trainservi0_.version as version8_16_ from tms.public.train_service trainservi0_
2016-02-29 13:09:34 WARN  SqlExceptionHelper:144 - SQL Error: 0, SQLState: 42703
2016-02-29 13:09:34 ERROR SqlExceptionHelper:146 - ERROR: column trainservi0_.trainserviceid does not exist
 Perhaps you meant to reference the column "trainservi0_.trainServiceId".

这是我的配置：

public class DataBaseProdConfig 

    @Resource
    private Environment env;

    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory() 
        LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
        em.setDataSource(dataSource());
        em.setPackagesToScan(env.getRequiredProperty("db.entity.package"));
        em.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
        em.setJpaProperties(getHibernateProperties());

        return em;
    

    @Bean
    public DataSource dataSource() 
        BasicDataSource ds = new BasicDataSource();
        ds.setUrl(env.getRequiredProperty("db.url"));
        ds.setDriverClassName(env.getRequiredProperty("db.driver"));
        ds.setUsername(env.getRequiredProperty("db.username"));
        ds.setPassword(env.getRequiredProperty("db.password"));

        ds.setInitialSize(Integer.valueOf(env.getRequiredProperty("db.initialSize")));
        ds.setMinIdle(Integer.valueOf(env.getRequiredProperty("db.minIdle")));
        ds.setMaxIdle(Integer.valueOf(env.getRequiredProperty("db.maxIdle")));
        ds.setTimeBetweenEvictionRunsMillis(Long.valueOf(env.getRequiredProperty("db.timeBetweenEvictionRunsMillis")));
        ds.setMinEvictableIdleTimeMillis(Long.valueOf(env.getRequiredProperty("db.minEvictableIdleTimeMillis")));
        ds.setTestOnBorrow(Boolean.valueOf(env.getRequiredProperty("db.testOnBorrow")));
        ds.setValidationQuery(env.getRequiredProperty("db.validationQuery"));
        return ds;
    

    @Bean
    public PlatformTransactionManager transactionManager() 
        JpaTransactionManager manager = new JpaTransactionManager();
        manager.setEntityManagerFactory(entityManagerFactory().getObject());

        return manager;
    

    public Properties getHibernateProperties() 
        try 
            Properties properties = new Properties();
            InputStream is = getClass().getClassLoader().getResourceAsStream("hibernate.properties");
            properties.load(is);

            return properties;
         catch (IOException e) 
            throw new IllegalArgumentException("Can't find 'hibernate.properties' in classpath!", e);
        
    

这是我的实体：

@Entity
@Table(name = "train_service", schema = "public", catalog = "tms")
public class TrainServiceEntity 
    private Long trainServiceId;
    @Id
    @SequenceGenerator(name="train_service_trainServiceId_seq",
            sequenceName="train_service_trainServiceId_seq",
            allocationSize=1)
    @GeneratedValue(strategy = GenerationType.SEQUENCE,
            generator="train_service_trainServiceId_seq")
    @Column(name = "trainServiceId")
    public Long getTrainServiceId() 
        return trainServiceId;
    

    public void setTrainServiceId(Long trainServiceId) 
        this.trainServiceId = trainServiceId;
    
....

所以 Hibernate 将 'trainServiceId' 转换为 'trainserviceid' ，但在日志中我看到了正确的字段名称：

Hibernate: select trainservi0_.trainServiceId as trainSer1_16_, ...

我需要做什么，强制 Hibernate 不将字段名称转换为小写？

【问题讨论】：

实体的列名如果需要大写，需要设置为大写。

我不想要大写，我不会使用与数据库中相同的驼峰式

“所以 Hibernate 将 'trainServiceId' 转换为 'trainserviceid' ，但在日志中我看到了正确的字段名称” 我不明白，你有问题还是不是？你怎么知道错误的语句被发送到数据库？来自数据库日志？

所以当我尝试执行 findAll() 语句时，我在日志中看到错误，因为我设置了“hibernate.show_sql = true”。请查看我的问题标题中的日志

【参考方案1】：

您可以尝试将大小写混合的列名称放在连字符中。

@Column("\"trainServiceId\"")

参见persistence tables，搜索“带有特殊字符和大小写混合的表格”