spring怎么整合mybatis-plus

Spring整合MyBatis-Plus的步骤如下：

1. 引入依赖：在pom.xml文件中添加以下依赖

<dependencies>
    <!--Spring Boot MyBatis Plus Starter-->
    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-boot-starter</artifactId>
        <version>${mybatis-plus.version}</version>
    </dependency>
    
    <!--MyBatis Plus 代码生成器-->
    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-generator</artifactId>
        <version>${mybatis-plus.version}</version>
    </dependency>
    
    <!--MyBatis Plus 分页插件-->
    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-extension</artifactId>
        <version>${mybatis-plus.version}</version>
    </dependency>
    
    <!--MyBatis Plus 自动填充插件-->
    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-extension</artifactId>
        <version>${mybatis-plus.version}</version>
    </dependency>
    
    <!--MyBatis Plus SQL注入器-->
    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-extension</artifactId>
        <version>${mybatis-plus.version}</version>
    </dependency>
</dependencies>

2. 配置数据源：在application.yml文件中添加数据源信息

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/mybatis_plus?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password: root
    driver-class-name: com.mysql.jdbc.Driver

3. 配置MyBatis-Plus：在application.yml文件中添加MyBatis-Plus配置信息

mybatis-plus:
  # 实体扫描，多个package用逗号或者分号分隔
  typeAliasesPackage: com.example.demo.entity
  # 显示SQL语句
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
  # 分页插件配置
  page:
    helper-dialect: mysql
    # 开启分页
    reasonable: true
    # 每页最多显示条数，默认500条
    max-limit: 10000
  # 自动填充配置
  global-config:
    db-config:
      # 自动填充创建时间
      meta-object-handler: com.baomidou.mybatisplus.extension.handlers.MybatisDefaultMetaObjectHandler

4. 创建实体类：创建Java Bean实体类，使用MyBatis-Plus注解定义表名和字段名

@Data
@TableName("user")
public class User {
    @TableId(type = IdType.AUTO)
    private Long id;
    private String name;
    private Integer age;
    private String email;
    private Date createTime;
    private Date updateTime;
}

5. 创建Mapper接口：创建Mapper接口，并继承MyBatis-Plus的BaseMapper接口

public interface UserMapper extends BaseMapper<User> {
}

6. 测试：编写测试类，测试MyBatis-Plus的CRUD操作

@SpringBootTest
class MybatisPlusDemoApplicationTests {

    @Autowired
    private UserMapper userMapper;

    @Test
    void contextLoads() {
    }

    @Test
    void testInsert() {
        User user = new User();
        user.setName("Tom");
        user.setAge(20);
        user.setEmail("tom@163.com");
        int result = userMapper.insert(user);
        System.out.println("插入结果：" + result);
    }

    @Test
    void testSelect() {
        List<User> userList = userMapper.selectList(null);
        System.out.println("查询结果：" + userList);
    }

    @Test
    void testUpdate() {
        User user = new User();
        user.setId(1L);
        user.setName("Jack");
        int result = userMapper.updateById(user);
        System.out.println("更新结果：" + result);
    }

    @Test
    void testDelete() {
        int result = userMapper.deleteById(1L);
        System.out.println("删除结果：" + result);
    }

}