xml版
程序结构
配置文件
dbUtil-阿帕奇提供操作数据库的插件
核心类：QueryRunner
.query() 查询
.update() 增删改
<dependencies>
<!-- spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.3.27</version>
</dependency>
<!-- 单元测试 -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<!-- spring测试包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.3.27</version>
</dependency>
<!-- dbutil -->
<dependency>
<groupId>commons-dbutils</groupId>
<artifactId>commons-dbutils</artifactId>
<version>1.4</version>
</dependency>
<!-- mysql -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.28</version>
</dependency>
<!-- 数据源 -->
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
<!-- lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.26</version>
</dependency>
</dependencies>实体类
实现Serializable接口
lombok插件
功能：对实体类自动，动态生成getset，无参有参.....
步骤：
1.idea安装插件(只做一次)
2.添加坐标
3.编写注解
@NoArgsConstructor
@AllArgsConstructor
@Datadao
配坐标 数据注入（set）
接口：
public void save(Account account);
public Account findByName(String name);
public List<Account> findAll();
public void updateById(Account account);
public void deleteById(int id);类：sql语句，继承接口
//操作数据库的核心类
QueryRunner queryRunner;
public void setQueryRunner(QueryRunner queryRunner) {
this.queryRunner = queryRunner;
}
@Override
public void save(Account account) {
try {
queryRunner.update("insert into test(aname,amoney) value (?,?)",account.getAname(),account.getAmoney());
} catch (SQLException throwables) {
throwables.printStackTrace();
}
}service
类：获取dao层数据
IAccountMapper mapper;
public void setMapper(IAccountMapper mapper) {
this.mapper = mapper;
}
@Override
public void save(Account account) {
mapper.save(account);
}controller
类：获取service层数据
public void setService(IAccountService service) {
this.service = service;
}
@Override
public void save(Account account) {
service.save(account);
}applicationContext.xml
链接数据库，层层传递数据
<!-- 加载资源文件-->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!-- 注入数据源-->
<bean id="dateSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${msg1}"/>
<property name="jdbcUrl" value="${msg2}"/>
<property name="user" value="${msg3}"/>
<property name="password" value="${msg4}"/>
</bean>
<!-- 注入QueryRunner-->
<bean id="queryRunner" class="org.apache.commons.dbutils.QueryRunner">
<constructor-arg name="ds" ref="dateSource"/>
</bean>
<!-- 注入dao-->
<bean id="mapperImp" class="com.zhe.dao.AccountMapperImp">
<property name="queryRunner" ref="queryRunner"/>
</bean>
<!-- 注入service-->
<bean id="service" class="com.zhe.service.AccountServiceImp">
<property name="mapper" ref="mapperImp"/>
</bean>
<!-- 注入controller-->
<bean id="controller" class="com.zhe.controller.AccountControllerImp">
<property name="service" ref="service"/>
</bean>junit测试
使用步骤：
1.坐标
2.注解(修饰方法)
@Test======>可以运行的方法
@Before====>@Test运行之前
@After=====>@Test运行之后
ClassPathXmlApplicationContext applicationContext=null;
IAccountController controller=null;
@Before //在test前调用
public void beforMethod(){
applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
controller=(IAccountController)applicationContext.getBean("controller");
}
@After//在test后调用
public void afterMethod(){
applicationContext.close();
}
@Test
public void show1(){
controller.save(new Account("小李",2000));
controller.save(new Account("大李",2000));
}
@Test
public void show2(){
List<Account> all=controller.findAll();
for (int i=0;i<all.size();i++){
Account account=all.get(i);
System.out.println(account);
}
}ann注解版
xml
将三层数据注入换为扫描
<!-- 扫描-->
<context:component-scan base-package="com.zhe"/>dao
加@Repository标签，set方法换为@Autowired标签
@Repository
public class AccountMapperImp implements IAccountMapper{
//操作数据库的核心类
@Autowired
QueryRunner queryRunner;service
@Service
public class AccountServiceImp implements IAccountService{
@Autowired
IAccountMapper mapper;controller
@Controller("controller")
public class AccountControllerImp implements IAccountController {
@Autowired
IAccountService service;配置类版
添加config包
ApplicationConfig类
@Configuration//配置类注解
@ComponentScan(basePackages = "com.zhe")//氛围
@Import(DataConfig.class)//连接注解
public class ApplicationConfig {
}DataConfig类
连接配置文件
@Configuration//配置类注解
@PropertySource(value = "classpath:jdbc.properties")//加载配置文件
public class DataConfig {
@Value("${msg1}")
private String driverClass;
@Value("${msg2}")
private String jdbcUrl;
@Value("${msg3}")
private String user;
@Value("${msg4}")
private String password;
@Bean
public DataSource dataSource(){
try {
ComboPooledDataSource comboPooledDataSource = new ComboPooledDataSource();
comboPooledDataSource.setDriverClass(driverClass);
comboPooledDataSource.setJdbcUrl(jdbcUrl);
comboPooledDataSource.setUser(user);
comboPooledDataSource.setPassword(password);
return comboPooledDataSource;
} catch (PropertyVetoException e) {
e.printStackTrace();
}
return null;
}
@Bean
public QueryRunner queryRunner(){
return new QueryRunner(dataSource());
}