# 请求时序图
## 单数据源
%20(1).png?alt=media)
Fireboom单数据源请求时序图
0 定义接口
```graphql
query MyQuery($id: Int = 1) {
todo_findUniqueTodo(where: {id: $id}) {
completed
createdAt
id
title
}
}
```
1-2飞布启动时
9-10飞布关闭时
3 请求
```bash
curl 'http://localhost:9991/operations/Single?id=1'
```
4 findUniqueTodo
```graphql
query MyQuery {
findUniqueTodo(where: { id: 1 }) {
completed
createdAt
id
title
}
}
```
5 SQL req
```sql
SELECT `completed`,`createdAt`,`id`,`title` FROM Todo WHERE id=1
```
6 SQL res
.png?alt=media)
7 Query res(json)
```json
{
"data": {
"findUniqueTodo": {
"completed": false,
"createdAt": "2022-12-31T16:00:01.000Z",
"id": 1,
"title": "This is Fireboom"
}
}
}
```
8 响应
```json
{
"todo_findUniqueTodo": {
"completed": true,
"createdAt": "2022-12-31T16:00:01.000Z",
"id": 1,
"title": "Hello world"
}
}
```
## 多数据源（并行）
.png?alt=media)
Fireboom多数据源请求时序图
0 定义接口
```graphql
query MyQuery($id: Int = 1) {
todo_findUniqueTodo(where: { id: $id }) {
completed
createdAt
id
title
}
system_getAllRoles {
code
remark
}
}
```
6 getAllRoles req
```bash
curl 'http://localhost:9123/api/v1/role/all'
```
7 getAllRoles res
```json
[
{ "code": "admin", "remark": "" },
{ "code": "user", "remark": "" }
]
```
8 响应
```json
{
"todo_findUniqueTodo": {
"completed": true,
"createdAt": "2022-12-31T16:00:01.000Z",
"id": 1,
"title": "Hello world"
},
"system_getAllRoles": [
{
"code": "admin",
"remark": ""
},
{
"code": "user",
"remark": ""
}
]
}
```
## 多数据源（串行-跨源关联）
最后，我们介绍下跨源特性，看下它的时序图。
.png?alt=media)
跨源关联本质上是一种流程编排，将通常情况下并行的请求，改造成串行。
即先执行第一个接口，然后将第一个接口的返回结果作为入参传递给第二个接口。
详情请查看 [kua-yuan-guan-lian](https://docs.fireboom.io/ji-chu-ke-shi-hua-kai-fa/api-gou-jian/kua-yuan-guan-lian "mention")