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package com.service.impl;
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import org.springframework.stereotype.Service;
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import java.util.Map;
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import java.util.List;
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import com.baomidou.mybatisplus.mapper.Wrapper;
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import com.baomidou.mybatisplus.mapper.EntityWrapper;
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import com.baomidou.mybatisplus.plugins.Page;
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import com.baomidou.mybatisplus.service.impl.ServiceImpl;
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import com.utils.PageUtils;
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import com.utils.Query;
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import com.dao.YonghuDao;
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import com.entity.YonghuEntity;
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import com.service.YonghuService;
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import com.entity.vo.YonghuVO;
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import com.entity.view.YonghuView;
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@Service("yonghuService")
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public class YonghuServiceImpl extends ServiceImpl<YonghuDao, YonghuEntity> implements YonghuService {
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//继承ServiceImpl获得MyBatis-Plus内置的基础CRUD方法（如insert(), selectById()等）
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//实现自定义的YonghuService接口，扩展特定业务方法
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@Override
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public PageUtils queryPage(Map<String, Object> params) {
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Page<YonghuEntity> page = this.selectPage(
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new Query<YonghuEntity>(params).getPage(),
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new EntityWrapper<YonghuEntity>()
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);
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return new PageUtils(page);
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}
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//作用：提供用户数据的分页列表（如管理后台的用户表格）
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//调用链：Controller → 此方法 → MP分页查询 → 返回PageUtils(含数据+分页信息)
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@Override
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public PageUtils queryPage(Map<String, Object> params, Wrapper<YonghuEntity> wrapper) {
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Page<YonghuView> page =new Query<YonghuView>(params).getPage();
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page.setRecords(baseMapper.selectListView(page,wrapper));
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PageUtils pageUtil = new PageUtils(page);
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return pageUtil;
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}
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//关键点：使用YonghuView（视图对象）而非实体类
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//优势：可关联多表数据（如用户+角色信息），避免N+1查询问题
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@Override
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public List<YonghuVO> selectListVO(Wrapper<YonghuEntity> wrapper) {
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return baseMapper.selectListVO(wrapper);
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}
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@Override
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public YonghuVO selectVO(Wrapper<YonghuEntity> wrapper) {
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return baseMapper.selectVO(wrapper);
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}
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@Override
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public List<YonghuView> selectListView(Wrapper<YonghuEntity> wrapper) {
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return baseMapper.selectListView(wrapper);
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}
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@Override
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public YonghuView selectView(Wrapper<YonghuEntity> wrapper) {
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return baseMapper.selectView(wrapper);
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}
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//分层数据转换：
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//VO (Value Object)：用于接口返回的数据封装
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//View：用于复杂页面展示（可能包含关联数据）
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//设计意义：隔离实体与接口数据，避免敏感字段泄露
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}
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