@TestpublicvoidupdateByMyWrapper() {//条件构造器QueryWrapper<User> wrapper =newQueryWrapper(); wrapper.eq("name", "admin");//修改后的对象User user =newUser(); user.setEmail("Test@email.com"); userMapper.updateByMyWrapper(wrapper, user); } Mybatis-plus的配置: #端口号 server: port:8088...
package com.itzhimei.mybatis.plus.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;import com.itzhimei.mybatis.plus.model.Classz;import com.itzhimei.mybatis.plus.model.Student;import org.apache.ibatis.annotations.One;import org.apache.ibatis.annotations.Result;import org.apache.ibatis.a...
和mybatis-plus非常类似，除了LamdaWrapper外还提供了普通QueryWrapper的写法，改造上面的代码：public void getOrderSimple() { List<OrderDto> list = orderMapper.selectJoinList(OrderDto.class, new MPJQueryWrapper<Order>() .selectAll(Order.class) .select("t2.unit_price","t2.name as produ...
Mybatis-Plus-Join提供MPJLambdaWrapper和MPJQueryWrapper实现连表查询。MPJLambdaWrapper支持Lambda表达式查询。 使用示例: List<UserDTO> list = baseMapper.selectJoinList(UserDTO.class, new MPJLambdaWrapper<UserDO>() .selectAll(UserDO.class) .select(UserAddressDO::getTel) .selectAs(UserAddressDO::getAddre...
简单的连表查询 classtest{@ResourceprivateUserMapperuserMapper;voidtestJoin(){MPJQueryWrapperwrapper=newMPJQueryWrapper<UserDO>().selectAll(UserDO.class).select("addr.tel","addr.address","a.province").leftJoin("user_address addr on t.id = addr.user_id").rightJoin("area a on addr.area_id...
QueryWrapper userWrapper = new QueryWrapper <>(); User user = new User(); 应用:update(user,userWrapper) user:封装的是修改的内容; userWrapper:是条件(查询需要修改内容的条件) 注意:一般都是默认and链接,or()是或者的连接。 6.更新采用lam表达式书写: ...
IPageselectPosts(Page page,@Param(Constants.WRAPPER) QueryWrapper wrapper); AI代码助手复制代码 xml中${ew.customSqlSegment} 就是querywrapper的条件 select* from user_collection${ew.customSqlSegment} AI代码助手复制代码 关于“mybatisplus怎么在xml的连表查询中使用queryWrapper”的内容就介绍到这里了,感谢大家...
9.使用mybatis-plus-join进行多表查询（例子）1.DTO类 package*.admin.api.dto;importcn.afterturn....
QueryWrapper<UserEntity> userWrapper = new QueryWrapper<>(); userWrapper.and(wrapper->wrapper.eq("username", "test2").or().eq("username", "mytest")) .and(wrapper -> wrapper.like("username", "mytest").or().like("username", "mytest"));#SELECT id,username,pwd,date_u,time_u...