Hibernate连接到Postgres db，但不检索数据

Question

I have a Java web application and I'm trying to retrieve a list of Clients from a Postgres database via class configured Hibernate. As far as I can tell, the application does get the connection because I checked the metadata from the connection and I see all my tables in there so it's alright. The problem is that I don't get any data from the table.

Here is my model for the Client:

@Entity
@Table(name="Client")
public class Client implements Serializable {

    @Id
    @Column(name="id", nullable= false)
    private Integer id;

    @Column(name="age", nullable = false)
    private Integer age;

    @Column(name="numberofrentals", nullable = false)
    private Integer numberofrentals;

    @Column(name="name", nullable = false)
    private String name;

    @Column(name="address", nullable = false)
    private String address;

    public Client() {
    }

    public Client(Integer id, Integer age, Integer numberofrentals, String name, String address) {

        this.id = id;
        this.age = age;
        this.numberofrentals = numberofrentals;
        this.name = name;
        this.address = address;
    }

    public Integer getId() {

        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public Integer getnumberofrentals() {
        return numberofrentals;
    }

    public void setnumberofrentals(int numberofrentals) {
        this.numberofrentals = numberofrentals;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAddress() {
        return address;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Client client = (Client) o;

        if (age != client.age) return false;
        if (numberofrentals != client.numberofrentals) return false;
        if (!id.equals(client.id)) return false;
        if (!name.equals(client.name)) return false;
        return address.equals(client.address);

    }

    @Override
    public int hashCode() {
        int result = id.hashCode();
        result = 31 * result + age;
        result = 31 * result + numberofrentals;
        result = 31 * result + name.hashCode();
        result = 31 * result + address.hashCode();
        return result;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "Client{" +
                "id=" + id +
                ", age=" + age +
                ", numberofrentals=" + numberofrentals +
                ", name='" + name + '\'' +
                ", address='" + address + '\'' +
                '}';
    }
}

Here is the code for the JPAConfiguration

@Configuration
@EnableJpaRepositories("repository")
@EnableTransactionManagement
@EnableCaching
public class JPAConfig {

    //    @Value("${db.jdbcURL}")
    private String jdbcURL = "jdbc:postgresql://localhost:5432/Shop";

    //    @Value("${db.user}")
    private String user = "postgres";

    //    @Value("${db.password}")
    private String password = "*****";

    //    @Value("${db.generateDDL}")
    private Boolean generateDDL = true;


    @Bean
    public DataSource dataSource() {
        PGPoolingDataSource dataSource = new PGPoolingDataSource();
        try {
            dataSource.setUrl(jdbcURL);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        dataSource.setUser(user);
        dataSource.setPassword(password);
        dataSource.setMaxConnections(4);

        return dataSource;
    }

    @Bean
    public EntityManagerFactory entityManagerFactory() {
        HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        vendorAdapter.setDatabase(Database.POSTGRESQL);
        vendorAdapter.setGenerateDdl(generateDDL);
        vendorAdapter.setShowSql(true);

        LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
        factory.setJpaVendorAdapter(vendorAdapter);
        factory.setPackagesToScan("model");
        factory.setDataSource(dataSource());
        factory.afterPropertiesSet();
        return factory.getObject();
    }

    @Bean
    public EntityManager entityManager() {
        return entityManagerFactory().createEntityManager();
    }

    @Bean
    PlatformTransactionManager transactionManager() {
        JpaTransactionManager manager = new JpaTransactionManager();
        manager.setEntityManagerFactory(entityManagerFactory());
        return manager;
    }

    @Bean
    public HibernateExceptionTranslator hibernateExceptionTranslator() {
        return new HibernateExceptionTranslator();
    }

    @Bean
    public CacheManager cacheManager() {
        GuavaCacheManager guavaCacheManager = new GuavaCacheManager();
        guavaCacheManager.setCacheBuilder(CacheBuilder.newBuilder().expireAfterAccess(2, TimeUnit.HOURS));
        return guavaCacheManager;
    }
}

I get connected but no data from my Client table which has these exact same fields: id(PK), age, numberofrentals, name, address. Any ideas what's wrong? I'm using the findall() from the JpaRepository. I don't understand what could be the problem, everything seems to be right.

If there's more code necessary, I can post more.

Is there any way to debug this or find out what is wrong because so far I could only get the connection and the list of tables and the rest of information sounds alright? Any ideas what could be wrong?

Answer 1

When hibernate creates a table, for some reason it creates it with all lower case letters and it will also read from those. I thought it accesses case-sensitive so I was adding data into the wrong table tables whereas the correct ones remained always empty.