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Eggjs -typeorm 之 TreeEntity 实战
2022-07-02 06:21:00 【原小明】
Tree - Entitiy
教程地址
https://typeorm.io/#/tree-entities
案例
场景：分组设计、树设计、菜单设计
树结构 , 括号里是存储的 ID
- 华北(11)
- 河南(14)
- 郑州(17)
- 焦作(18)
- 河北(15)
- 太原(19)
- 华南(12)
- 西南(13)
- 四川(16)
UserGroup
@Entity()
@Tree("closure-table")
export class UserGroup {
@PrimaryGeneratedColumn()
id: number;
@Column({ default: 0 })
status: number;
@CreateDateColumn()
createDate: Date;
@UpdateDateColumn()
updateDate: Date;
@Column()
groupName: string;
@TreeChildren()
children: UserGroup[];
@TreeParent()
parent: UserGroup;
}
UserGroupRepository
@EntityRepository(UserGroup)
export default class UserGroupRepository extends TreeRepository<UserGroup> {
}
1.添加一级节点
代码
const userGroup = new UserGroup()
userGroup.groupName = '华北'
const saveResult = await userGroupRep.save(userGroup)
数据
{
"groupName": "华北",
"id": 11,
"status": 0,
"createDate": "2019-04-20T02:44:48.799Z",
"updateDate": "2019-04-20T02:44:48.799Z"
}
2.添加子节点
添加 四川
代码
const userGroupChild = new UserGroup()
userGroupChild.groupName = '四川'
const parent = await userGroupRep.findOne(13);
if(parent){
userGroupChild.parent = parent
}
await userGroupRep.save(userGroupChild)
数据格式与上面的一致
{
"code": 0,
"msg": "ok",
"data": [
{
"id": 11,
"status": 0,
"createDate": "2019-04-20T02:44:48.799Z",
"updateDate": "2019-04-20T02:44:48.799Z",
"groupName": "华北",
"children": [
{
"id": 14,
"status": 0,
"createDate": "2019-04-20T03:02:58.551Z",
"updateDate": "2019-04-20T03:02:58.551Z",
"groupName": "河南",
"children": [
{
"id": 17,
"status": 0,
"createDate": "2019-04-20T03:08:24.459Z",
"updateDate": "2019-04-20T03:08:24.459Z",
"groupName": "郑州",
"children": []
},
{
"id": 18,
"status": 0,
"createDate": "2019-04-20T03:08:39.077Z",
"updateDate": "2019-04-20T03:08:39.077Z",
"groupName": "焦作",
"children": []
}
]
},
{
"id": 15,
"status": 0,
"createDate": "2019-04-20T03:04:28.248Z",
"updateDate": "2019-04-20T03:04:28.248Z",
"groupName": "河北",
"children": []
}
]
},
{
"id": 12,
"status": 0,
"createDate": "2019-04-20T02:58:51.236Z",
"updateDate": "2019-04-20T02:58:51.236Z",
"groupName": "华南",
"children": []
},
{
"id": 13,
"status": 0,
"createDate": "2019-04-20T02:59:07.329Z",
"updateDate": "2019-04-20T02:59:07.329Z",
"groupName": "西南",
"children": [
{
"id": 16,
"status": 0,
"createDate": "2019-04-20T03:05:34.187Z",
"updateDate": "2019-04-20T03:05:34.187Z",
"groupName": "四川",
"children": []
}
]
}
]
}
3.所有数据嵌套显示
代码
await userGroupRep.findTrees()
数据
{
"code": 0,
"msg": "ok",
"data": [
{
"id": 11,
"status": 0,
"createDate": "2019-04-20T02:44:48.799Z",
"updateDate": "2019-04-20T02:44:48.799Z",
"groupName": "华北",
"children": [
{
"id": 14,
"status": 0,
"createDate": "2019-04-20T03:02:58.551Z",
"updateDate": "2019-04-20T03:02:58.551Z",
"groupName": "河南",
"children": [
{
"id": 17,
"status": 0,
"createDate": "2019-04-20T03:08:24.459Z",
"updateDate": "2019-04-20T03:08:24.459Z",
"groupName": "郑州",
"children": []
},
{
"id": 18,
"status": 0,
"createDate": "2019-04-20T03:08:39.077Z",
"updateDate": "2019-04-20T03:08:39.077Z",
"groupName": "焦作",
"children": []
}
]
},
{
"id": 15,
"status": 0,
"createDate": "2019-04-20T03:04:28.248Z",
"updateDate": "2019-04-20T03:04:28.248Z",
"groupName": "河北",
"children": []
}
]
},
{
"id": 12,
"status": 0,
"createDate": "2019-04-20T02:58:51.236Z",
"updateDate": "2019-04-20T02:58:51.236Z",
"groupName": "华南",
"children": []
},
{
"id": 13,
"status": 0,
"createDate": "2019-04-20T02:59:07.329Z",
"updateDate": "2019-04-20T02:59:07.329Z",
"groupName": "西南",
"children": [
{
"id": 16,
"status": 0,
"createDate": "2019-04-20T03:05:34.187Z",
"updateDate": "2019-04-20T03:05:34.187Z",
"groupName": "四川",
"children": []
}
]
}
]
}
4.只显示根级目录
代码
await userGroupRep.findRoots()
数据
{
"code": 0,
"msg": "ok",
"data": [
{
"id": 11,
"status": 0,
"createDate": "2019-04-20T02:44:48.799Z",
"updateDate": "2019-04-20T02:44:48.799Z",
"groupName": "华北"
},
{
"id": 12,
"status": 0,
"createDate": "2019-04-20T02:58:51.236Z",
"updateDate": "2019-04-20T02:58:51.236Z",
"groupName": "华南"
},
{
"id": 13,
"status": 0,
"createDate": "2019-04-20T02:59:07.329Z",
"updateDate": "2019-04-20T02:59:07.329Z",
"groupName": "西南"
}
]
}
5.指定 Parent 的所有子节点（无嵌套）
代码
const groups = await userGroupRep.findDescendants(parent);
数据
{
"code": 0,
"msg": "ok",
"data": [
{
"id": 11,
"status": 0,
"createDate": "2019-04-20T02:44:48.799Z",
"updateDate": "2019-04-20T02:44:48.799Z",
"groupName": "华北"
},
{
"id": 14,
"status": 0,
"createDate": "2019-04-20T03:02:58.551Z",
"updateDate": "2019-04-20T03:02:58.551Z",
"groupName": "河南"
},
{
"id": 15,
"status": 0,
"createDate": "2019-04-20T03:04:28.248Z",
"updateDate": "2019-04-20T03:04:28.248Z",
"groupName": "河北"
},
{
"id": 17,
"status": 0,
"createDate": "2019-04-20T03:08:24.459Z",
"updateDate": "2019-04-20T03:08:24.459Z",
"groupName": "郑州"
},
{
"id": 18,
"status": 0,
"createDate": "2019-04-20T03:08:39.077Z",
"updateDate": "2019-04-20T03:08:39.077Z",
"groupName": "焦作"
}
]
}
6.指定 Parent 的所有子节点（嵌套）
代码
await userGroupRep.findDescendantsTree(parent);
数据
{
"code": 0,
"msg": "ok",
"data": {
"id": 11,
"status": 0,
"createDate": "2019-04-20T02:44:48.799Z",
"updateDate": "2019-04-20T02:44:48.799Z",
"groupName": "华北",
"children": [
{
"id": 14,
"status": 0,
"createDate": "2019-04-20T03:02:58.551Z",
"updateDate": "2019-04-20T03:02:58.551Z",
"groupName": "河南",
"children": [
{
"id": 17,
"status": 0,
"createDate": "2019-04-20T03:08:24.459Z",
"updateDate": "2019-04-20T03:08:24.459Z",
"groupName": "郑州",
"children": []
},
{
"id": 18,
"status": 0,
"createDate": "2019-04-20T03:08:39.077Z",
"updateDate": "2019-04-20T03:08:39.077Z",
"groupName": "焦作",
"children": []
}
]
},
{
"id": 15,
"status": 0,
"createDate": "2019-04-20T03:04:28.248Z",
"updateDate": "2019-04-20T03:04:28.248Z",
"groupName": "河北",
"children": []
}
]
}
}
7.指定 Parent 的子节点数量
代码
const groups = await userGroupRep.countDescendants(parent);
数据
{
"code": 0,
"msg": "ok",
"data": 5
}
8.指定 Parent 的父节点相关操作
无嵌套数据：userGroupRep.findAncestors()
嵌套数据：userGroupRep.findAncestorsTree()
父节点数量：userGroupRep.countAncestors()
9.指定每个节点条件相关操作
const childrens = await repository
.createDescendantsQueryBuilder("category", "categoryClosure", parentCategory)
.andWhere("category.type = 'secondary'")
.getMany();
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