mybatis-plus的CRUD详细操作及实例

// 根据主键ID删除 @RequestMapping(value = "/delete/{id}", method = ) public boolean delete(@PathVariable("id") Long id) { return ById(id); }// 删除符合条件的数据// 删除username和id符合的数据 @RequestMapping(value = "/delete2", method = ) public boolean delete2(@RequestBody User user) { Map columnMap = new HashMap<>(); ("username", rname()); ("id", ()); return ByMap(columnMap); }// 批量删除 @RequestMapping(value = "/delete4", method = ) public boolean delete4(@RequestBody List ids) { return ByIds(ids); }// 删除id>10的数据 @RequestMapping(value = "/delete3", method = ) public boolean delete3() { QueryWrapper queryWrapper = new QueryWrapper(); ("id", 10); return (queryWrapper); }

修改Update// 根据 UpdateWrapper 条件，更新记录 需要设置sqlsetboolean update(Wrapper updateWrapper);// 根据 whereEntity 条件，更新记录boolean update(T entity, Wrapper updateWrapper);// 根据 ID 选择修改boolean updateById(T entity);// 根据ID 批量更新boolean updateBatchById(Collection entityList);// 根据ID 批量更新boolean updateBatchById(Collection entityList, int batchSize);

// 查询所有List list();// 查询列表List list(Wrapper queryWrapper);// 查询（根据ID 批量查询）Collection listByIds(Collection idList);// 查询（根据 columnMap 条件）Collection listByMap(Map columnMap);// 查询所有列表List> listMaps();// 查询列表List> listMaps(Wrapper queryWrapper);// 查询全部记录List