【hibernate】自定义转换器
转载：https://www.cnblogs.com/yangchongxing/p/10398255.html
1、转换基本属性
package cn.ycx.study.hibernate.bean; import java.math.BigDecimal;
import java.util.Currency; public class Money {
public static final String SPLIT_SYMBOL = " ";
protected BigDecimal value;
protected Currency currency;
public Money(BigDecimal value, Currency currency) {
this.value = value;
this.currency = currency;
}
public BigDecimal getValue() {
return value;
}
public void setValue(BigDecimal value) {
this.value = value;
}
public Currency getCurrency() {
return currency;
}
public void setCurrency(Currency currency) {
this.currency = currency;
}
@Override
public String toString() {
return getValue().toString() + SPLIT_SYMBOL + getCurrency();
}
public static Money fromString(String s) {
String[] split = s.split(SPLIT_SYMBOL);
return new Money(new BigDecimal(split[0]), Currency.getInstance(split[1]));
}
}
转换器实现
package cn.ycx.study.hibernate.converter;
import javax.persistence.AttributeConverter;
import cn.ycx.study.hibernate.bean.Money;
public class MoneyConverter implements AttributeConverter<Money, String> {
@Override
public String convertToDatabaseColumn(Money attribute) {
return attribute.toString();
}
@Override
public Money convertToEntityAttribute(String dbData) {
return Money.fromString(dbData);
}
}
实体对象
package cn.ycx.study.hibernate.entity; import javax.persistence.Convert;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id; import cn.ycx.study.hibernate.bean.Money;
import cn.ycx.study.hibernate.converter.MoneyConverter;
@Entity
@org.hibernate.annotations.DynamicInsert
@org.hibernate.annotations.DynamicUpdate
public class User {
@Id
@GeneratedValue(generator="id_generator")
protected long id;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
@Convert(converter = MoneyConverter.class,disableConversion=false)
protected Money money;
public Money getMoney() {
return money;
}
public void setMoney(Money money) {
this.money = money;
}
}
测试
@Test
public void testInsert() {
User u = new User();
u.setMoney(new Money(new BigDecimal(10), Currency.getInstance(Locale.CHINA)));
this.session.persist(u);
assertTrue( true );
}
2、转换组件的属性
package cn.ycx.study.hibernate.entity; import javax.persistence.Convert;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id; import cn.ycx.study.hibernate.bean.Money;
import cn.ycx.study.hibernate.converter.MoneyConverter;
import cn.ycx.study.hibernate.converter.ZipcodeConverter;
@Entity
@org.hibernate.annotations.DynamicInsert
@org.hibernate.annotations.DynamicUpdate
public class User {
@Id
@GeneratedValue(generator="id_generator")
protected long id;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
//转换基本属性
@Convert( converter = MoneyConverter.class, disableConversion = false )
protected Money money;
public Money getMoney() {
return money;
}
public void setMoney(Money money) {
this.money = money;
}
//转换组件属性
@Convert( converter = ZipcodeConverter.class, attributeName = "zipcode")
protected Address address;
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
}
attributeName 声明了可嵌入 Address 类的 zipcode 属性。这一设置支持圆点属性路径，如果 zipcode 是 可嵌入 City 的属性，则要使用嵌套路径 city.zipcode 类引用它
组件
package cn.ycx.study.hibernate.entity;
import javax.persistence.Embeddable;
import javax.validation.constraints.NotNull; import cn.ycx.study.hibernate.bean.Zipcode;
@Embeddable
public class Address {
@NotNull
protected String street;
@NotNull
protected Zipcode zipcode;
@NotNull
protected City city;
public Address() {
}
public Address(String street, Zipcode zipcode, City city) {
this.street = street;
this.zipcode = zipcode;
this.city = city;
}
public String getStreet() {
return street;
}
public void setStreet(String street) {
this.street = street;
}
public Zipcode getZipcode() {
return zipcode;
}
public void setZipcode(Zipcode zipcode) {
this.zipcode = zipcode;
}
public City getCity() {
return city;
}
public void setCity(City city) {
this.city = city;
}
}
package cn.ycx.study.hibernate.bean;
public abstract class Zipcode {
protected String symbol;
protected String value;
public Zipcode(String symbol, String value) {
this.symbol = symbol;
this.value = value;
}
public String getSymbol() {
return symbol;
}
public void setSymbol(String symbol) {
this.symbol = symbol;
}
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
}
package cn.ycx.study.hibernate.bean;
public class *pcode extends Zipcode {
public *pcode(String symbol, String value) {
super(symbol, value);
}
}
package cn.ycx.study.hibernate.bean;
public class UsaZipcode extends Zipcode {
public UsaZipcode(String symbol, String value) {
super(symbol, value);
}
}
转换器
package cn.ycx.study.hibernate.converter; import javax.persistence.AttributeConverter; import cn.ycx.study.hibernate.bean.*pcode;
import cn.ycx.study.hibernate.bean.UsaZipcode;
import cn.ycx.study.hibernate.bean.Zipcode; public class ZipcodeConverter implements AttributeConverter<Zipcode, String> { @Override
public String convertToDatabaseColumn(Zipcode attribute) {
return attribute.getValue();
} @Override
public Zipcode convertToEntityAttribute(String dbData) {
if (dbData.length() == 6) {
return new *pcode("CN", dbData);
} else if (dbData.length() == 5) {
return new UsaZipcode("US", dbData);
}
throw new IllegalArgumentException("Unsupported zipcode in database...");
} }