????1.spring ??????????????
???????????????ò???????????????????????????JDBC??Hibernate??java????API????????????????????spring????????????Щ?????????
????DAO(data access boject)?????????????????????????д??????DAO????ó????????????????
????DAO?????????????д????????е???????????????????????????????????ó?????????????????????????????????
????????????????????????????????????????????и???DAO??DAO???????????????????????
????2.?????????
????spring??????spring?????????????????Bean???????????????
????a.???JDBC??????????????????
????b.???JNDI????????????
????c.?????????????
?????????????????????????????????????????????
????(??c??)
??????????????Bean????????
<!--????????? -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"/>
<property name="url" value="jdbc:oracle:thin:@localhost:1521:orcl"/>
<property name="username" value="wwo"/>
<property name="password" value="wwo"/>
<!-- ?????????????? -->
<property name="initialSize" value="3" />
<!-- ???????? -->
<property name="maxActive" value="300" />
<!-- ?????.??????????????????????????????????ò?????????????????????????????maxIdle?? -->
<property name="maxIdle" value="2" />
<!-- С????.???????????????????????????????????Щ???????????????????????? -->
<property name="minIdle" value="1" />
<!-- end -->
</bean>
???????JDBC?????????????г??????????д??????????????
???????????????????????????????????????????????????????????????????????????????
????3.??Spring?м???Hibernate
????Hibernate?Щ?????
????a.???????(Lazy loading)?????????Bean????????????????????Bean????????????????????????????????Bean?????????????????????????????????????????????????
????b.?????(Eager fetching)???????????????????????Bean????????????Bean????????????????????β????????
????c.????(Cascading)?????????????Bean???????????????????????????????????????????Bean??
????Spring??Hibernate ORM???????????????Щ???????????Щ?????????????????????????
????a.Spring?????????????????
????b.????????????
????c.??????????????????????
????d.DAO?????
????e.????????