初识DB4O
DB4O？新出的OODBMS~取谐音DB for O 。一个优秀的OODBMS解决方案，它出现的定位就是为了开发嵌入式和小型应用，同HSQLDB的定位相仿。不过DB4O的的优点则是，本身是OODBMS，那么对它的操作自然就是基于OO的，同Hiberante一样，但是Hiberante是ORM解决方案，而DB4O则是原生OODBMS方案。看看下面的例子
一个同Hibernate相同的POJO，没有任何方法，也没有跟DB4O有任何耦合。
<div style="border-right: #cccccc 1px solid; padding-right: 5px; border-top: #cccccc 1px solid; padding-left: 4px; font-size: 13px; padding-bottom: 4px; border-left: #cccccc 1px solid; width: 98%; padding-top: 4px; border-bottom: #cccccc 1px solid; background-color: #eeeeee;"> 1http://www.blogjava.net/Images/OutliningIndicators/None.gifpackage name.lgn.db4o.test.model;
2http://www.blogjava.net/Images/OutliningIndicators/None.gif
3http://www.blogjava.net/Images/OutliningIndicators/ExpandedBlockStart.gifhttp://www.blogjava.net/Images/OutliningIndicators/ContractedBlock.gifpublic class Person http://www.blogjava.net/Images/dot.gif{
4http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif
5http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif private String firstName;
6http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif
7http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif private String lastName;
8http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif
9http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif private int age;
10http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif
11http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.blogjava.net/Images/OutliningIndicators/ContractedSubBlock.gif public Person(String firstName, String lastName, int age) http://www.blogjava.net/Images/dot.gif{
12http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif this.firstName = firstName;
13http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif this.lastName = lastName;
14http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif this.age = age;
15http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
16http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif
17http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.blogjava.net/Images/OutliningIndicators/ContractedSubBlock.gif public String getFirstName() http://www.blogjava.net/Images/dot.gif{
18http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif return firstName;
19http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
20http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif
21http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.blogjava.net/Images/OutliningIndicators/ContractedSubBlock.gif public void setFirstName(String value) http://www.blogjava.net/Images/dot.gif{
22http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif firstName = value;
23http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
24http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif
25http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.blogjava.net/Images/OutliningIndicators/ContractedSubBlock.gif public String getLastName() http://www.blogjava.net/Images/dot.gif{
26http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif return lastName;
27http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
28http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif
29http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.blogjava.net/Images/OutliningIndicators/ContractedSubBlock.gif public void setLastName(String value) http://www.blogjava.net/Images/dot.gif{
30http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif lastName = value;
31http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
32http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif
33http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.blogjava.net/Images/OutliningIndicators/ContractedSubBlock.gif public int getAge() http://www.blogjava.net/Images/dot.gif{
34http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif return age;
35http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
36http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif
37http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockStart.gifhttp://www.blogjava.net/Images/OutliningIndicators/ContractedSubBlock.gif public void setAge(int value) http://www.blogjava.net/Images/dot.gif{
38http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif age = value;
39http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockEnd.gif }
40http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif
41http://www.blogjava.net/Images/OutliningIndicators/ExpandedBlockEnd.gif}
42http://www.blogjava.net/Images/OutliningIndicators/None.gif
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