用spring 创建ComboPooledDataSource和JdbcTemplate对象

ゝ一纸荒年。 2024-04-02 03:44 34阅读 0赞

用spring 创建ComboPooledDataSource和JdbcTemplate对象  
3.1添加ioc相关jar包

<dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-expression</artifactId>
      <version>4.3.18.RELEASE</version>
    </dependency>

3.2创建db.properties文件

driverClass=com.mysql.jdbc.Driver
    url=jdbc:mysql://localhost:3306/ssm
    user=root
    password=123

3.3在applicationContext.xml文件中创建对象

<context:property-placeholder location="db.properties"></context:property-placeholder>
    
    
    <bean id="comboPooledDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
       <property name="driverClass" value="${driverClass}" />
        <property name="jdbcUrl" value="${url}"/>
        <property name="user" value="${user}" />
        <property name="password" value="${password}" />
    </bean>
    
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate" >
        <constructor-arg name="dataSource" ref="comboPooledDataSource" />
    </bean>

3.4 修改dao 层

@Component
    public class UsersDao implements IUsersDao {
    
        //注入jdbcTemplate对象
        @Autowired
        private JdbcTemplate jdbcTemplate;
    
        public JdbcTemplate getJdbcTemplate() {
            return jdbcTemplate;
        }
    
        public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
            this.jdbcTemplate = jdbcTemplate;
        }
    
        //update方法 (增 删 改)
        @Override
        public void add(Users user) {
    
            String sql = "insert into users values(null,?,?)";
    
            jdbcTemplate.update(sql, user.getUname(), user.getPassword());
    
        }

3.5测试

@Test
    public void test()
    {
        ClassPathXmlApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
    
        IUsersDao usersDao=  applicationContext.getBean("usersDao",IUsersDao.class);
    
        Users user=new Users("xiaowanglaoshi","123");
    
        usersDao.add(user);
    }