[英]How to query data from `PostgresSql`?
I use NestJj
, PostgreSQL
and Graphql
for Back-End, Flutter
, graphql_flutter
for Front End.我使用
NestJj
, PostgreSQL
和Graphql
作为后端, Flutter
, graphql_flutter
作为前端。
I have a collection store
like this:我有一个这样的
collection store
:
I want to get the following result:我想得到以下结果:
[
{
type:'A',
details:[
{name:'Food1'}
]
},
{
type:'Expense',
details:[
{name:'gym'},
{name:'Dinner'}
]
},
{
type:'Revenue',
details:[
{name:'Revenue'}
]
}
]
For show on the device:在设备上显示:
How can I query?
我该如何查询? Could you help me?
你可以帮帮我吗?
I'm not sure if you'll be able to build that structure at the level of SQL. What you can do is to extract the data from the table wit the structure as it is and then map it at the level of JS.我不确定您是否能够在 SQL 级别构建该结构。您可以做的是按原样从表中提取数据,然后在 JS 级别 map 中提取数据。
// here's an example with TypeORM
const data = await Collection.findBy({...});
const result = data.map(item => ({
type: item.type,
details: [{
name: item.name
}]
}));
PS I'm pretty sure that's not the answer you've expected but it will solve your issue. PS 我很确定这不是您所期望的答案,但它会解决您的问题。
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