开源框架spring详解-----spring对JDBC的支持.docx

?开源框架spring详解-----spring对JDBC的支持(一)????? 1、spring对DAO的支持? ??Java代码 ?public?class?AccountServiceImpl?implements?AccountService{ ??????private?AccountDao?accountDao; ??????/**?set方法注入?*/??????public?void?setAccountDao(AccountDao?accountDao); ??????????this.accountDao?=?accountDao; ??????????????????} ??????????????????public?void?insert(Account?acc){ ??????????????????????accountDao.insert(acc); ??????????????????} ??}???public class AccountServiceImpl implements AccountService{private AccountDao accountDao;/** set方法注入 */public void setAccountDao(AccountDao accountDao);this.accountDao = accountDao; } public void insert(Account acc){ accountDao.insert(acc); }} ????????从这个类的源代码可以看出，程序所依赖的是数据访问接口。因此，可以随时更换AccountDao的实现类。Spring的DAO框架正式基于这样的基本原理来将应用程序与底层数据存取技术解耦的。???2、数据源的注入?对数据库数据执行任何的存取操作，必须要有数据源，spring提供了javax.sql,DataSource注入，这样在需要更换数据源时只需要在spring配置文件中修改即可。而不需要修改程序代码。???????????????不同的应用系统可能使用不同的数据源。??????? 2.1、不带连接池的数据源??? Xml代码 ?!--?配置不带连接池的数据源?--??????bean?id=dataSource?class=org.springframework.jdbc.datasource.DriverManagerDataSource??????????property?name=driverClassName?value=com.mysql.jdbc.Driver?/??????????property?name=url?value=jdbc:mysql:///spring?/??????????property?name=username?value=root?/??????????property?name=password?value=123??????/bean??????bean?id=accountDao?class=com.zxf.dao.AccountDaoImpl??????????property?name=dataSource?ref=dataSource?/??????/bean?????? ??????bean?id=accountService?class=com.zxf.service.AccountService??????????property?name=accountDao?ref=accountDao/??????/bean??!-- 配置不带连接池的数据源 --bean id=dataSource class=org.springframework.jdbc.datasource.DriverManagerDataSourceproperty name=driverClassName value=com.mysql.jdbc.Driver /property name=url value=jdbc:mysql:///spring /property name=username value=root /property name=password value=123/beanbean id=accountDao class=com.zxf.dao.AccountDaoImplproperty name=dataSource ref=dataSource //beanbean id=accountService class=com.zxf.