在java中使用key value型数据库Berkeley DB

除了关系型数据库外，还有key-value型数据库可以选择，在大型的查询系统中，key-value型数据库可以出色的完成某些任务。
Oracle的Berkeley DB就是一种key-value型数据库，本文简要介绍在java中使用Berkeley DB。
PartKey.java:
import java.io.Serializable;
public class PartKey implements Serializable
{
private String number;
public PartKey(String number) {
this.number = number;
}
public final String getNumber() {
return number;
}
public String toString() {
return "[PartKey: number=" + number + ']';
}
}
Weight.java
public class Weight implements Serializable
{
public final static String GRAMS = "grams";
public final static String OUNCES = "ounces";
private double amount;
private String units;
public Weight(double amount, String units)
{
this.amount = amount;
this.units = units;
}
public final double getAmount()
{
return amount;
}
public final String getUnits()
{
return units;
}
public String toString()
{
return "[" + amount + ' ' + units + ']';
}
}
PartData.java
public class PartData implements Serializable
{
private String name;
private String color;
private Weight weight;
private String city;
public PartData(String name, String color, Weight weight, String city)
{
this.name = name;
this.color = color;
this.weight = weight;
this.city = city;
}
public final String getName()
{
return name;
}
public final String getColor()
{
return color;
}
public final Weight getWeight()
{
return weight;
}
public final String getCity()
{
return city;
}
public String toString()
{
return "[PartData: name=" + name +
" color=" + color +
" weight=" + weight +
" city=" + city +