6、Spring_Junit与JdbcTemplate整合

Spring 整合

1.Spring 整合 Junit

1.1新建项目结构

1.2导入依赖

• 导入 junit 与 Spring 依赖

  <!--        添加 spring 依赖-->
  <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.2.17.RELEASE</version>
  </dependency>
  <!--        添加 junit 依赖-->
  <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
  </dependency>
      <!--        添加 spring test 整合依赖-->
  <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>5.2.7.RELEASE</version>
  </dependency>

1.3正常的写 spring 代码

• 添加 mapper

  @Repository
  public class StudentMapperImpl implements StudentMapper {
      public void save() {
          System.out.println("保存操作");
      }
  }

• 添加配置类

  @Configuration
  @ComponentScan("cn.sycoder")
  public class SpringConfig {
  }

1.4通过测试类拿去mapper

• 先建立测试类

  @RunWith(SpringJUnit4ClassRunner.class)
  @ContextConfiguration(classes = {SpringConfig.class})
  public class StudentTest {
      @Autowired
      private StudentMapper studentMapper;
  
  
      @Test
      public void testStudentMapper(){
          studentMapper.save();
      }
  
  }

1.5@Runwith

说明	@Runwith
位置	测试类上方
作用	测试类注解，设置 junit 运行器的
属性	使用测试运行的环境，SpringJUnit4ClassRunner.class

1.5@ContextConfiguration

说明	@ContextConfiguration
位置	测试类上方
作用	设置 junit 加载 spring 配置类
属性	classes：核心配置类，可以传入多个 locations：配置文件的文件路径名称

2.Spring整合JdbcTemplate

• 概述：jdbcTemplate 是 spring 对于学过的 jdbc 的封装，实现了方便操作数据库

2.1导入依赖

• 导入依赖

  <!--        添加 orm 依赖-->
          <dependency>
              <groupId>org.springframework</groupId>
              <artifactId>spring-orm</artifactId>
              <version>5.2.17.RELEASE</version>
          </dependency>
          <dependency>
              <groupId>mysql</groupId>
              <artifactId>mysql-connector-java</artifactId>
              <version>8.0.29</version>
          </dependency>
          <dependency>
              <groupId>com.alibaba</groupId>
              <artifactId>druid</artifactId>
              <version>1.2.8</version>
          </dependency>
      <dependency>
              <groupId>org.projectlombok</groupId>
              <artifactId>lombok</artifactId>
              <version>1.18.22</version>
          </dependency>

2.2建立 jdbc.propreties

• 创建配置文件

  jdbc.username=root
  jdbc.password=123456
  jdbc.driverClassName=com.mysql.cj.jdbc.Driver
  jdbc.url=jdbc:mysql://localhost:3306/mybatis

2.3配置druid 连接池

• 配置类

  @Configuration
  @PropertySource("jdbc.properties")
  public class DruidConfig {
      @Value("${jdbc.username}")
      private String username;
      @Value("${jdbc.password}")
      private String password;
      @Value("${jdbc.url}")
      private String url;
      @Value("${jdbc.driverClassName}")
      private String driver;
  
  
      @Bean
      public DataSource dataSource(){
          final DruidDataSource source = new DruidDataSource();
          source.setUsername(username);
          source.setPassword(password);
          source.setDriverClassName(driver);
          source.setUrl(url);
          return source;
      }
  
  }

• 配置 jdbcTemplate 类

  @Configuration
  @PropertySource("jdbc.properties")
  public class DruidConfig {
     @Value("${jdbc.username}")
      private String username;
      @Value("${jdbc.password}")
      private String password;
      @Value("${jdbc.url}")
      private String url;
      @Value("${jdbc.driverClassName}")
      private String driver;
  
  
      @Bean
      public DataSource dataSource(){
          final DruidDataSource source = new DruidDataSource();
          source.setUsername(username);
          source.setPassword(password);
          source.setDriverClassName(driver);
          source.setUrl(url);
          return source;
      }
      
      @Bean
      public JdbcTemplate jdbcTemplate(DataSource dataSource){
          JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);
          return jdbcTemplate;
      }
  
  }

2.4修改 mapper 实现类做保存和查询操作

• 修改保存

  @Repository
  public class StudentMapperImpl implements StudentMapper {
  
      @Autowired
      private JdbcTemplate template;
  
      public void save() {
          String sql = "insert into student value(null,?,?)";
          template.update(sql,"sy",18);
      }
  
      public Student getById(Long id) {
          Object student = template.queryForObject("select * from student where id = ?",
                  new BeanPropertyRowMapper(Student.class), id);
          return (Student) student;
  //        return null;
      }
  }