?? monetaryamountsimpleusertype.java
字號:
package auction.persistence;import org.hibernate.*;import org.hibernate.usertype.UserType;import auction.model.*;import java.math.BigDecimal;import java.sql.*;import java.util.Currency;import java.io.Serializable;/** * This is a simple Hibernate custom mapping type for MonetaryAmount value types. * <p> * Note that this mapping type is for legacy databases that only have a * single numeric column to hold monetary amounts. Every <tt>MonetaryAmount</tt> * will be converted to USD (using some conversion magic of the class itself) * and saved to the database. * <p> * Do not ask me how this currency conversion works. It doesn't work, it's not implemented. * The whole point of this class is not to show how you can convert money, but how * you can write a custom UserType. * * @author Christian Bauer */public class MonetaryAmountSimpleUserType implements UserType { public int[] sqlTypes() { return new int[]{ Hibernate.BIG_DECIMAL.sqlType() }; } public Class returnedClass() { return MonetaryAmount.class; } public boolean isMutable() { return false; } public Object deepCopy(Object value) { return value; } public Serializable disassemble(Object value) { return (Serializable) value; } public Object assemble(Serializable cached, Object owner) { return cached; } public Object replace(Object original, Object target, Object owner) { return original; } public boolean equals(Object x, Object y) { if (x == y) return true; if (x == null || y == null) return false; return x.equals(y); } public int hashCode(Object x) { return x.hashCode(); } public Object nullSafeGet(ResultSet resultSet, String[] names, Object owner) throws HibernateException, SQLException { BigDecimal valueInUSD = resultSet.getBigDecimal(names[0]); if (resultSet.wasNull()) return null; // Has to be done after first read Currency storedCurrency = Currency.getInstance("USD"); return new MonetaryAmount(valueInUSD, storedCurrency); } public void nullSafeSet(PreparedStatement statement, Object value, int index) throws HibernateException, SQLException { if (value == null) { statement.setNull(index, Hibernate.BIG_DECIMAL.sqlType()); } else { MonetaryAmount anyCurrency = (MonetaryAmount)value; MonetaryAmount amountInUSD = MonetaryAmount.convert( anyCurrency, Currency.getInstance("USD") ); statement.setBigDecimal(index, amountInUSD.getValue()); } }}
?? 快捷鍵說明
復制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -