(2)list多条件查询 (3)map多条件查询 一、<foreach>的六个属性 <foreach>属性介绍 *open和close指在foreach标签头和尾添加指定内容,常见于IN和VALUES函数 二、<foreach>的应用环境 1、批量插入表数据 INSERT INTO table (a, b, c, d) VALUES <foreach collection = "list" item = "item" separatior ...
Map<Integer, String> hashMap = dept.stream().collect(toMap(Dept::getDeptId, Dept::getDeptName)); // 封装Vo,并添加到集合中(关键内容) userVos.forEach(e -> e.setDeptName(hashMap.get(e.getDeptId())); } 2、理论分析 先查询包含id的列表记录,从结果集中析出id并转化成批查询语句再访问数据...
mapping(StuSubRelation::getSubId, toList()));for(StudentVo studentVo : studentVoList) {//获取课程列表List<SubjectBo> list = ListUtils.select(subjectBoList, e ->emptyIfNull(map.get(studentVo.getId())).contains(e.getId()));//填充分数list.forEach(e ->e.setScore(table....
IPage<Map<String, Object>> pageMaps(IPage<T> page); // 条件分页查询 IPage<Map<String, Object>> pageMaps(IPage<T> page, Wrapper<T> queryWrapper); 1. 2. 3. 4. 5. 6. 7. 8. IXxxService.java: package com.example.demo.user.service; import com.baomidou.mybatisplus.extension.servic...
<update id="updateBatch" parameterType="java.util.Map">update salary_insurance_benefit_person<trim prefix="set" suffixOverrides=","> <trim prefix="remarks=case" suffix="end,"> <foreach collection="list" item="cus"> <iftest="cus.remarks != null and cus.remarks != ''">when id=#{cus...
mybatisplusforeach的用法 mybatisplusforeach的⽤法 ⼀： foreach ⽤于 select * from tablename where colname in (A,B,C……);1：service 层：Set<String> teacherNums = new HashSet<>();Set<String> departments = new HashSet<>();list.stream().forEach(s->{ teacherNums.add(s.get...
(Wrappers.lambdaQuery(Dept.class).in(Dept::getDeptId,deptIds));// 构造映射关系,方便匹配deptId与deptNameMap<Integer,String>hashMap=dept.stream().collect(toMap(Dept::getDeptId,Dept::getDeptName));// 封装Vo,并添加到集合中(关键内容)userVos.forEach(e->e.setDeptName(hashMap.get(e.getDeptId...
<foreach></forwach>:可以对数组、Map或实现了Iterable接口(如List、Set)的对象遍历。可实现in、批量更新、批量插入等。 <resultMap></resultMap>:映射结果集 <resultType></resultType>:映射结果类型,可是java实体类或Map、List等类型。 二、MyBatis-plus ...
("email","t");List<Map<String,Object>>maps=userMapper.selectMaps(wrapper);maps.forEach(System.out::println);}// 模糊查询@Testvoidtest5(){QueryWrapper<User>wrapper=newQueryWrapper<>();// id 在子查询中查出来wrapper.inSql("id","select id from user where id<3");List<Object>objects=...
<resultMap type="$!{tableInfo.savePackageName}.domain.pojo.$!{tableInfo.name}" id="$!{tableInfo.name}Map"> #foreach($column in $tableInfo.fullColumn) <result property="$!column.name" column="$!column.obj.name" jdbcType="$!column.ext.jdbcType"/> ...