Joda Money通过hibernate实现持久性

Question

JodaTime有一个库提供Hibernate持久性。最近，我开始研究Joda Money，并开始研究如何使用hibernate将其持久化，但我没有看到任何库。

有什么建议吗？

Answer 1

由于Sudarshan答案中到示例的链接已断开，下面是org.joda.money.BigMoney的一个简单自定义用户类型的实现，它将money对象持久化为两列(amount和currency(，以及如何使用它的示例。它对org.joda.money.Money的作用相同。

package test;
import java.io.Serializable;
import java.math.BigDecimal;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Currency;
import org.apache.commons.lang.ObjectUtils;
import org.hibernate.HibernateException;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.type.StandardBasicTypes;
import org.hibernate.type.Type;
import org.hibernate.usertype.CompositeUserType;
import org.joda.money.BigMoney;
import org.joda.money.CurrencyUnit;
public class MoneyUserType implements CompositeUserType
{
    private static final String[] PROPERTY_NAMES = {"amount", "currencyUnit"};
    private static final Type[] PROPERTY_TYPES = {StandardBasicTypes.BIG_DECIMAL, StandardBasicTypes.CURRENCY};
    public MoneyUserType()
    {
        super();
    }
    public Object assemble(final Serializable cached, final SessionImplementor session, final Object owner)
    throws HibernateException
    {
        return cached;
    }
    public Serializable disassemble(final Object value, final SessionImplementor session) throws HibernateException
    {
        return (Serializable) value;
    }
    public String[] getPropertyNames()
    {
        return PROPERTY_NAMES.clone();
    }
    public Type[] getPropertyTypes()
    {
        return PROPERTY_TYPES.clone();
    }
    public Object getPropertyValue(final Object component, final int property) throws HibernateException
    {
        BigMoney money = (BigMoney) component;
        return (property == 0) ? money.getAmount() : money.getCurrencyUnit().toCurrency();
    }
    public Object nullSafeGet(final ResultSet rs, final String[] names, final SessionImplementor session,
    final Object owner) throws HibernateException, SQLException
    {
        BigDecimal amount = StandardBasicTypes.BIG_DECIMAL.nullSafeGet(rs, names[0], session);
        Currency currency = StandardBasicTypes.CURRENCY.nullSafeGet(rs, names[1], session);
        return BigMoney.of(CurrencyUnit.of(currency), amount);
    }
    public void nullSafeSet(final PreparedStatement st, final Object value, final int index,
    final SessionImplementor session) throws HibernateException, SQLException
    {
        BigMoney money = (BigMoney) value;
        BigDecimal amount = (money == null) ? null : money.getAmount();
        Currency currency = (money == null) ? null : money.getCurrencyUnit().toCurrency();
        StandardBasicTypes.BIG_DECIMAL.nullSafeSet(st, amount, index, session);
        StandardBasicTypes.CURRENCY.nullSafeSet(st, currency, index + 1, session);
    }
    public Object replace(final Object original, final Object target, final SessionImplementor session,
    final Object owner) throws HibernateException
    {
        return deepCopy(original);
    }
    public void setPropertyValue(final Object component, final int property, final Object value)
    throws HibernateException
    {
        throw new HibernateException("Money is immutable.");
    }
    public Object deepCopy(final Object value) throws HibernateException
    {
        return (value != null) ? BigMoney.of(((BigMoney) value).getCurrencyUnit(),
        ((BigMoney) value).getAmount()) : null;
    }
    public boolean equals(final Object x, final Object y) throws HibernateException
    {
        return ObjectUtils.equals(x, y);
    }
    public int hashCode(final Object x) throws HibernateException
    {
        return ObjectUtils.hashCode(x);
    }
    public boolean isMutable()
    {
        return false;
    }
    public Class<?> returnedClass()
    {
        return BigMoney.class;
    }
}

用法：

@Type(type = "test.MoneyUserType")
@Columns(columns = {@Column(name = "AMOUNT"), @Column(name = "CURRENCY")})
private BigMoney money;

Answer 2

用户类型项目包括Joda Money支持。

Answer 3

User Type项目自3.0.0版本起提供对joda money 0.6的支持。但是请注意，这需要Hibernate 4。此外，目前的joda money版本是0.8

如果您想将它与Hibernate 3一起使用，请使用Sudarshan anwser中的示例(在撰写本文时它已被窃听(。

Answer 4

好吧，我采纳了你的建议，为Joda Library中定义的Money编写了一个自定义类型，作为参考，人们可以在这里查找，在这里使用，并在这里测试自定义类型

Answer 5

基于http://jadira.sourceforge.net

货币类型通常由货币和金额组成。Jadira可以使用参数配置的货币仅将金额存储到数据库中。例如：

@Column
@Type(type = "org.jadira.usertype.moneyandcurrency.joda.PersistentMoneyAmount",
    parameters = {@org.hibernate.annotations.Parameter(name = "currencyCode", value = "USD")})
private Money money;
Alternatively, with other types two columns to hold the amount an currency:
@Columns(columns = { @Column(name = "MY_CURRENCY"), @Column(name = "MY_AMOUNT") })
@Type(type = "org.jadira.usertype.moneyandcurrency.joda.PersistentMoneyAmountAndCurrency")
private Money money;

Answer 6

Joda Money是非常新的，所以还没有人为它提供Hibernate映射也就不足为奇了。

然而，编写自定义Hibernate类型的适配器非常简单。如果您查看JodaTime适配器的源代码，您会发现它们非常简单。有关如何编写自己的文档，请参阅文档。