五、Spring整合Mybatis

1.添加依赖

• 添加依赖

  <dependencies>
          <dependency>
              <groupId>org.springframework</groupId>
              <artifactId>spring-context</artifactId>
              <version>5.2.17.RELEASE</version>
          </dependency>
          <dependency>
              <groupId>junit</groupId>
              <artifactId>junit</artifactId>
              <version>4.12</version>
              <!--            <scope>test</scope>-->
          </dependency>
          <dependency>
              <groupId>com.alibaba</groupId>
              <artifactId>druid</artifactId>
              <version>1.1.16</version>
          </dependency>
          <dependency>
              <groupId>mysql</groupId>
              <artifactId>mysql-connector-java</artifactId>
              <version>8.0.29</version>
          </dependency>
  <!--        spring 整合 mybatis 的包-->
          <dependency>
              <groupId>org.mybatis</groupId>
              <artifactId>mybatis-spring</artifactId>
              <version>1.3.0</version>
          </dependency>
  <!--        mybatis 包-->
          <dependency>
              <groupId>org.mybatis</groupId>
              <artifactId>mybatis</artifactId>
              <version>3.5.6</version>
          </dependency>
  <!--        spring 操作 jdbc 包-->
          <dependency>
              <groupId>org.springframework</groupId>
              <artifactId>spring-jdbc</artifactId>
              <version>4.3.29.RELEASE</version>
          </dependency>
      </dependencies>
  

2.配置类

2.1配置Spring配置类

• 配置类

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

2.2配置JDBC配置类

• 配置类

  public class JdbcConfig {
      @Value("${jdbc.username}")
      private String username;
      @Value("${jdbc.password}")
      private String password;
      @Value("${jdbc.driverClassName}")
      private String driverClassName;
      @Value("${jdbc.url}")
      private String url;
      //配置连接池
      @Bean
      public DataSource dataSource(){
          DruidDataSource source = new DruidDataSource();
          source.setUsername(username);
          source.setPassword(password);
          source.setDriverClassName(driverClassName);
          source.setUrl(url);
          return source;
      }
  }
  

2.3添加数据库配置文件

• 配置文件

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

• 导入到spring 中

  @Configuration
  @ComponentScan("cn.sycoder")
  @PropertySource("db.properties")
  @Import({JdbcConfig.class,MyBatisConfig.class})
  public class SpringConfig {
  }
  

• 创建数据库和数据表

  create table account
  (
  	id bigint auto_increment
  		primary key,
  	money int null
  );
  

2.4创建Mybatis 配置类

• 创建配置类

  public class MyBatisConfig {
  //    配置SqlSqlSessionFactoryBean
      @Bean
      public SqlSessionFactoryBean sessionFactory(DataSource dataSource){
          SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
          bean.setDataSource(dataSource);//设置数据源
          return bean;
      }
      
      @Bean
      public MapperScannerConfigurer mapperScannerConfigurer(){
          MapperScannerConfigurer configurer = new MapperScannerConfigurer();
          configurer.setBasePackage("cn.sycoder.mapper");
          return configurer;
      }
  }
  

• 配置与 xml 配置的对比

  

3.添加代码生成器

• 拷贝代码生成器到项目中并且配置插件

• 需要修改代码生成器的数据库连接信息

  <build>
          <plugins>
              <!--           引入 generator 插件-->
              <plugin>
                  <groupId>org.mybatis.generator</groupId>
                  <artifactId>mybatis-generator-maven-plugin</artifactId>
                  <version>1.3.2</version>
                  <configuration>
                      <verbose>true</verbose>
                      <overwrite>false</overwrite>
                  </configuration>
                  <dependencies>
                      <!--                    引入插件需要的依赖-->
                      <dependency>
                          <groupId>mysql</groupId>
                          <artifactId>mysql-connector-java</artifactId>
                          <version>8.0.29</version>
                      </dependency>
                  </dependencies>
              </plugin>
          </plugins>
      </build>
  

4.出现问题

• class not find

  

• 解决方案

  <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.6</version>
  </dependency>
  

  

• 解决方案

  <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>4.3.29.RELEASE</version>
  </dependency>
  

• 包之间的关系