springboot接入mybatis管理数据库

• 1.创建springboot项目(使用开发工具类似IDEA新建Springboot项目)

• 2.pom依赖引入

    <!-- mysql-connector-java -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>${mysql.version}</version>
    </dependency>
    <!-- mybatis-spring-boot-starter -->
    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>${mybatis.version}</version>
    </dependency>
  

• 3.配置文件(application.yml)

    # 数据库配置
    spring:
      datasource:
        # 驱动
        driver-class-name: com.mysql.cj.jdbc.Driver
        # url
        url: jdbc:mysql://xxx:3306/second_kill?characterEncoding=utf-8&useSSL=false
        # 用户名
        username: xxx
        # 密码
        password: xxx
        dbcp2:
          # 验证查询
          validation-query: select 1 from dual
    
    # MyBatis
    mybatis:
      # 包别名配置
      type-aliases-package: com.kinson.springboot.domain
      # mapper xml位置配置
      mapper-locations: classpath:/secondKill/*.xml
      # 控制台打印sql(https://www.cnblogs.com/kingsonfu/p/9245731.html)
      configuration:
        log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
  

• 4.启动类加MapperScan注解

    @SpringBootApplication
    // 多个以逗号分隔
    @MapperScan({"com.kinson.springboot.mapper", "xxx"})
    public class SecondKillProSpringboot {
    
        public static void main(String[] args) {
            SpringApplication.run(SecondKillProSpringboot.class, args);
        }
    }
  

• 5.新加数据库表映射类

    public class User {
    
        private Integer id;
    
        private String userName;
    
        public Integer getId() {
            return id;
        }
    
        public void setId(Integer id) {
            this.id = id;
        }
    
        public String getUserName() {
            return userName;
        }
    
        public void setUserName(String userName) {
            this.userName = userName;
        }
    }
  

• 6.新增对应的Mapper类

  public interface UserMapper {

    /**
     * 查询所有用户
     *
     * @return
     */
    List<User> selectUserList();
  

  }

• 7.新增对应Mapper的映射xml文件

    <select id="selectUserList" parameterType="User" resultMap="UserResult">
        select * from user
    </select>
  

• 8.之后就可以使用mapper在service注入使用了

Github源码：springboot-mybatis