springboot中使用mybatisplus分页插件

1.环境初始化
引入依赖
添加插件
在application中配置数据源
添加日志
添加mapper注解，表明mapper接口的位置
2.添加配置类

package top.roud.cms.common;

import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * @ClassName: MybatisPlusConfig
 * @Description:
 * @Author roud
 * @Date 2022/6/8
 * @Version 1.0
 */
@Configuration
@MapperScan("top.roud.cms.mapper")
public class MybatisPlusConfig  {
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
        interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.H2));
        return interceptor;
    }
}

3.使用分页插件

package top.roud.cms.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import top.roud.cms.entity.User;

/**
 * @ClassName: UserMapper
 * @Description:
 * @Author roud
 * @Date 2022/6/8
 * @Version 1.0
 */
public interface UserMapper extends BaseMapper<User> {
    User selectUserByPhonenumberAndPassword(String phonenumber, String password);
    User selectUserByPhonenumber(String phonenumber);
}

需要传入的参数为1.当前页码、2.每页显示的数据数、3.进行模糊查询的字符串

@Override
    public Result findPage(Integer pageNum, Integer pageSize, String search) {
        LambdaQueryWrapper<User> wrapper = Wrappers.<User>lambdaQuery();
        if(StrUtil.isNotBlank(search)){
            wrapper.like(User::getNickname, search);
        }
        Page<User> userPage = userMapper.selectPage(new Page<>(pageNum, pageSize), wrapper);
        return Result.success(userPage);
    }