Question

大家好我有奇怪的问题。我有完全hibernate + spring的应用程序。如果我只使用hibernate来添加/编辑/删除对象，那么一切都很有效。但是，当我直接在DB应用程序上进行更改时，看不到更改？（不要更新它们）。我的坚持很简单：

    <persistence-unit name="allegroTransactionPersistenceUnit" transaction-type="RESOURCE_LOCAL">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
            <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/AllegroShop?UseUnicode=true&amp;characterEncoding=utf8" />
            <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
            <property name="hibernate.connection.username" value="topSecret" />
            <property name="hibernate.connection.password" value="topSecret" />
            <!-- <property name="hibernate.hbm2ddl.auto" value="create" /> -->
            <property name="hibernate.hbm2ddl.auto" value="update" />
            <property name="show_sql" value="true" />
            <property name="hibernate.hbm2ddl.import_files" value="/SQL/payment_type.sql"/>
            <property name="hibernate.connection.useUnicode" value="true" />
            <property name="hibernate.connection.characterEncoding" value="UTF-8" />
            <property name="hibernate.connection.charSet" value="UTF-8" />
        </properties>
    </persistence-unit>
</persistence>

我的示例课程也不难理解：

@Entity(name = "PAYMENT_TYPE")
public class PaymentTypeImpl implements PaymentType {

    @Id
    @Column(name = "PAYMENT_ID")
    @GeneratedValue(strategy = GenerationType.AUTO)
    protected Long id;

    @Column(name = "PAYMENT_NAME")
    protected String paymentName;

    @Column(name = "PRICE", nullable = false)
    protected float paymentPrice;

    @Column(name = "ACTIVE")
    protected boolean active;

    @Override
    public Long getId() {
        return id;
    }

    @Override
    public void setId(Long id) {
        this.id = id;
    }

    @Override
    public String getPaymentName() {
        return paymentName;
    }

    @Override
    public void setPaymentName(String paymentName) {
        this.paymentName = paymentName;
    }

    @Override
    public boolean getActive(){
        return active;
    }

    @Override
    public boolean isActive(){
        return active;
    }

    @Override
    public void setActive(boolean active) {
        this.active = active;
    }

    @Override
    public float getPaymentPrice() {
        return paymentPrice;
    }

    @Override
    public void setPaymentPrice(float paymentPrice) {
        this.paymentPrice = paymentPrice;
    }
}

有什么想法吗？任何可以帮助我的链接？

Answer 1

如果您在直接更新之前已经读过实体，这可能是由休眠二级缓存引起的。您可以在实体上使用@Cacheable(false)注释将其禁用，这当然可能会影响性能。

如果我直接在数据库上创建它，那么带有hibernate的Java不会看到任何变化吗？

1 个答案: