网站建设教程微云网盘,在定点二进制运算器中减法运算一般通过,安徽黄山旅游攻略,什么可以制作网页实体类字段不做映射#xff0c;typeorm实现联查查询 1、副表json格式放到主表字段下
//goods表和member表联表#xff0c;关系goods.id member.uid#xff0c;member表数据json对象格式放到主表userInfo下
//leftJoinAndMapOne配合getMany实现
const builder await getCo… 实体类字段不做映射typeorm实现联查查询 1、副表json格式放到主表字段下
//goods表和member表联表关系goods.id member.uidmember表数据json对象格式放到主表userInfo下
//leftJoinAndMapOne配合getMany实现
const builder await getConnection().createQueryBuilder();
builder.select([goods.id,goods.goodName,]).from(DzhPortalGoodsEntity, goods) .leftJoinAndMapOne(goods.userInfo,DzhMemberUserEntity,member,member.id goods.uid);
const list: any await builder.getMany();
console.log(list)
//输出
// [
// {
// id: 178,
// goodName: Nature重大发现淋巴管竟可产生红细胞和白细胞,
// userInfo: {
// id: 12,
// createTime: 2022-11-23 20:53:33,
// nickname: dzhking,
// role_id: 1,
// }
// },
// ] 2、多个副表字段并列主表字段
//goods表和member表联表关系goods.id member.uid多个副表字段并列主表字段
//leftJoinAndSelect配合getRawMany
// 特别要注意 主表字段要加别名 子查询里面的附表id一定要填写不然报错字段前也不能加别名也报错
const builder await getConnection().createQueryBuilder();
builder.select([goods.id as id,goods.goodName as id goodName,]).from(DzhPortalGoodsEntity, goods) .leftJoinAndSelect(qb {return qb.subQuery().select([id, username, nickname]).from(DzhMemberUserEntity, member);},member,member.id goods.uid).groupBy(goods.id);
const list: any await builder.getRawMany();
console.log(list)//把leftJoinAndSelect换成也可以leftJoinAndMapOne.leftJoinAndMapOne(goods.userInfo,qb {return qb.subQuery().select([id, username, nickname]).from(DzhMemberUserEntity, member);},member,member.id goods.uid)//输出
// [
// {
// id: 178,
// username: dzhking,
// nickname: dzhking,
// goodsName: Nature重大发现淋巴管竟可产生红细胞和白细胞
// },
// ]3、副表字段并列主表字段 副表字段json格式插入到主表字段 关联其他表字段
const builder getConnection().createQueryBuilder();
builder.select([goods.id as id,goods.goodName as goodName,(SELECT JSON_OBJECT( id,id,username,username,nickname,nickname ) FROM dzh_member_user member WHERE member.id goods.uid) as userInfo ,(SELECT cate.cateName FROM dzh_portal_cate cate WHERE cate.id goods.cateId ) as cateName,]).from(DzhPortalGoodsEntity, goods) .leftJoinAndSelect(qb {return qb.subQuery().select([id, username, nickname]).from(DzhMemberUserEntity, member);},member,member.id goods.uid).groupBy(goods.id);
const list: any await builder.getRawMany();
//输出
// [
// {
// id: 178,
// username: dzhking,
// nickname: dzhking,
// goodName: Nature重大发现淋巴管竟可产生红细胞和白细胞,
// userInfo: {
// id: 12,
// nickname: dzhking,
// username: dzhking
// },
// cateName: 市场分析
// },
// ]
