// 查詢(xún)所有
List<T> list();
// 查詢(xún)列表
List<T> list(Wrapper<T> queryWrapper);
// 查詢(xún)（根據(jù)ID 批量查詢(xún)）
Collection<T> listByIds(Collection<? extends Serializable> idList);
// 查詢(xún)（根據(jù) columnMap 條件）
Collection<T> listByMap(Map<String, Object> columnMap);
// 查詢(xún)所有列表
List<Map<String, Object>> listMaps();
// 查詢(xún)列表
List<Map<String, Object>> listMaps(Wrapper<T> queryWrapper);
// 查詢(xún)?nèi)坑涗?
List<Object> listObjs();
// 查詢(xún)?nèi)坑涗?
<V> List<V> listObjs(Function<? super Object, V> mapper);
// 根據(jù) Wrapper 條件，查詢(xún)?nèi)坑涗?
List<Object> listObjs(Wrapper<T> queryWrapper);
// 根據(jù) Wrapper 條件，查詢(xún)?nèi)坑涗?
<V> List<V> listObjs(Wrapper<T> queryWrapper, Function<? super Object, V> mapper);

import com.hxstrive.mybatis_plus.model.UserBean;
import com.hxstrive.mybatis_plus.service.UserService;
import org.junit.jupiter.api.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.List;
 
@RunWith(SpringRunner.class)
@SpringBootTest
class List1Test {
 
    @Autowired
    private UserService userService;
 
    @Test
    void contextLoads() {
        List<UserBean> userBeanList = userService.list();
        System.out.println("size=" + userBeanList.size());
    }
 
}

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.hxstrive.mybatis_plus.model.UserBean;
import com.hxstrive.mybatis_plus.service.UserService;
import org.junit.jupiter.api.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.List;
 
@RunWith(SpringRunner.class)
@SpringBootTest
class List2Test {
 
    @Autowired
    private UserService userService;
 
    @Test
    void contextLoads() {
        QueryWrapper<UserBean> wrapper = new QueryWrapper<>();
        wrapper.gt("user_id", 10);
        wrapper.lt("user_id", 20);
        wrapper.eq("sex", "男");
 
        List<UserBean> userBeanList = userService.list(wrapper);
        for(UserBean userBean : userBeanList) {
            System.out.println(userBean);
        }
    }
 
}