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Eggjs -typeorm treeenity practice
2022-07-02 06:39:00 【Xiao Ming Yuan】
Tree - Entitiy
Tutorial address
https://typeorm.io/#/tree-entities
Case study
scene ： Grouping design 、 Tree design 、 Menu design
Tree structure , In parentheses is stored ID
- The north China (11)
- Henan (14)
- zhengzhou (17)
- Jiaozuo (18)
- hebei (15)
- taiyuan (19)
- south China (12)
- southwest (13)
- sichuan (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. Add a level one node
Code
const userGroup = new UserGroup()
userGroup.groupName = ' The north China '
const saveResult = await userGroupRep.save(userGroup)
data
{
"groupName": " The north China ",
"id": 11,
"status": 0,
"createDate": "2019-04-20T02:44:48.799Z",
"updateDate": "2019-04-20T02:44:48.799Z"
}
2. Add child nodes
add to sichuan
Code
const userGroupChild = new UserGroup()
userGroupChild.groupName = ' sichuan '
const parent = await userGroupRep.findOne(13);
if(parent){
userGroupChild.parent = parent
}
await userGroupRep.save(userGroupChild)
The data format is consistent with the above
{
"code": 0,
"msg": "ok",
"data": [
{
"id": 11,
"status": 0,
"createDate": "2019-04-20T02:44:48.799Z",
"updateDate": "2019-04-20T02:44:48.799Z",
"groupName": " The north China ",
"children": [
{
"id": 14,
"status": 0,
"createDate": "2019-04-20T03:02:58.551Z",
"updateDate": "2019-04-20T03:02:58.551Z",
"groupName": " Henan ",
"children": [
{
"id": 17,
"status": 0,
"createDate": "2019-04-20T03:08:24.459Z",
"updateDate": "2019-04-20T03:08:24.459Z",
"groupName": " zhengzhou ",
"children": []
},
{
"id": 18,
"status": 0,
"createDate": "2019-04-20T03:08:39.077Z",
"updateDate": "2019-04-20T03:08:39.077Z",
"groupName": " Jiaozuo ",
"children": []
}
]
},
{
"id": 15,
"status": 0,
"createDate": "2019-04-20T03:04:28.248Z",
"updateDate": "2019-04-20T03:04:28.248Z",
"groupName": " hebei ",
"children": []
}
]
},
{
"id": 12,
"status": 0,
"createDate": "2019-04-20T02:58:51.236Z",
"updateDate": "2019-04-20T02:58:51.236Z",
"groupName": " south China ",
"children": []
},
{
"id": 13,
"status": 0,
"createDate": "2019-04-20T02:59:07.329Z",
"updateDate": "2019-04-20T02:59:07.329Z",
"groupName": " southwest ",
"children": [
{
"id": 16,
"status": 0,
"createDate": "2019-04-20T03:05:34.187Z",
"updateDate": "2019-04-20T03:05:34.187Z",
"groupName": " sichuan ",
"children": []
}
]
}
]
}
3. All data is displayed nested
Code
await userGroupRep.findTrees()
data
{
"code": 0,
"msg": "ok",
"data": [
{
"id": 11,
"status": 0,
"createDate": "2019-04-20T02:44:48.799Z",
"updateDate": "2019-04-20T02:44:48.799Z",
"groupName": " The north China ",
"children": [
{
"id": 14,
"status": 0,
"createDate": "2019-04-20T03:02:58.551Z",
"updateDate": "2019-04-20T03:02:58.551Z",
"groupName": " Henan ",
"children": [
{
"id": 17,
"status": 0,
"createDate": "2019-04-20T03:08:24.459Z",
"updateDate": "2019-04-20T03:08:24.459Z",
"groupName": " zhengzhou ",
"children": []
},
{
"id": 18,
"status": 0,
"createDate": "2019-04-20T03:08:39.077Z",
"updateDate": "2019-04-20T03:08:39.077Z",
"groupName": " Jiaozuo ",
"children": []
}
]
},
{
"id": 15,
"status": 0,
"createDate": "2019-04-20T03:04:28.248Z",
"updateDate": "2019-04-20T03:04:28.248Z",
"groupName": " hebei ",
"children": []
}
]
},
{
"id": 12,
"status": 0,
"createDate": "2019-04-20T02:58:51.236Z",
"updateDate": "2019-04-20T02:58:51.236Z",
"groupName": " south China ",
"children": []
},
{
"id": 13,
"status": 0,
"createDate": "2019-04-20T02:59:07.329Z",
"updateDate": "2019-04-20T02:59:07.329Z",
"groupName": " southwest ",
"children": [
{
"id": 16,
"status": 0,
"createDate": "2019-04-20T03:05:34.187Z",
"updateDate": "2019-04-20T03:05:34.187Z",
"groupName": " sichuan ",
"children": []
}
]
}
]
}
4. Show only the root directory
Code
await userGroupRep.findRoots()
data
{
"code": 0,
"msg": "ok",
"data": [
{
"id": 11,
"status": 0,
"createDate": "2019-04-20T02:44:48.799Z",
"updateDate": "2019-04-20T02:44:48.799Z",
"groupName": " The north China "
},
{
"id": 12,
"status": 0,
"createDate": "2019-04-20T02:58:51.236Z",
"updateDate": "2019-04-20T02:58:51.236Z",
"groupName": " south China "
},
{
"id": 13,
"status": 0,
"createDate": "2019-04-20T02:59:07.329Z",
"updateDate": "2019-04-20T02:59:07.329Z",
"groupName": " southwest "
}
]
}
5. Appoint Parent All child nodes of （ No nesting ）
Code
const groups = await userGroupRep.findDescendants(parent);
data
{
"code": 0,
"msg": "ok",
"data": [
{
"id": 11,
"status": 0,
"createDate": "2019-04-20T02:44:48.799Z",
"updateDate": "2019-04-20T02:44:48.799Z",
"groupName": " The north China "
},
{
"id": 14,
"status": 0,
"createDate": "2019-04-20T03:02:58.551Z",
"updateDate": "2019-04-20T03:02:58.551Z",
"groupName": " Henan "
},
{
"id": 15,
"status": 0,
"createDate": "2019-04-20T03:04:28.248Z",
"updateDate": "2019-04-20T03:04:28.248Z",
"groupName": " hebei "
},
{
"id": 17,
"status": 0,
"createDate": "2019-04-20T03:08:24.459Z",
"updateDate": "2019-04-20T03:08:24.459Z",
"groupName": " zhengzhou "
},
{
"id": 18,
"status": 0,
"createDate": "2019-04-20T03:08:39.077Z",
"updateDate": "2019-04-20T03:08:39.077Z",
"groupName": " Jiaozuo "
}
]
}
6. Appoint Parent All child nodes of （ nesting ）
Code
await userGroupRep.findDescendantsTree(parent);
data
{
"code": 0,
"msg": "ok",
"data": {
"id": 11,
"status": 0,
"createDate": "2019-04-20T02:44:48.799Z",
"updateDate": "2019-04-20T02:44:48.799Z",
"groupName": " The north China ",
"children": [
{
"id": 14,
"status": 0,
"createDate": "2019-04-20T03:02:58.551Z",
"updateDate": "2019-04-20T03:02:58.551Z",
"groupName": " Henan ",
"children": [
{
"id": 17,
"status": 0,
"createDate": "2019-04-20T03:08:24.459Z",
"updateDate": "2019-04-20T03:08:24.459Z",
"groupName": " zhengzhou ",
"children": []
},
{
"id": 18,
"status": 0,
"createDate": "2019-04-20T03:08:39.077Z",
"updateDate": "2019-04-20T03:08:39.077Z",
"groupName": " Jiaozuo ",
"children": []
}
]
},
{
"id": 15,
"status": 0,
"createDate": "2019-04-20T03:04:28.248Z",
"updateDate": "2019-04-20T03:04:28.248Z",
"groupName": " hebei ",
"children": []
}
]
}
}
7. Appoint Parent Number of child nodes of
Code
const groups = await userGroupRep.countDescendants(parent);
data
{
"code": 0,
"msg": "ok",
"data": 5
}
8. Appoint Parent Operations related to the parent node of
No nested data ：userGroupRep.findAncestors()
Nested data ：userGroupRep.findAncestorsTree()
Number of parent nodes ：userGroupRep.countAncestors()
9. Specify the operation related to each node condition
const childrens = await repository
.createDescendantsQueryBuilder("category", "categoryClosure", parentCategory)
.andWhere("category.type = 'secondary'")
.getMany();
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