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版本:9.x

useQuery()

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@trpc/react 提供的钩子函数是 React Query 的一层薄封装。有关选项和使用模式的详细信息,请参阅其文档中的 查询

tsx
function useQuery(
pathAndInput: [string, TInput?],
opts?: UseTRPCQueryOptions;
)
tsx
function useQuery(
pathAndInput: [string, TInput?],
opts?: UseTRPCQueryOptions;
)

第一个参数是 [path, input] 元组 —— 如果 input 是可选的,可以省略 , input 部分。

你会注意到 path 参数支持自动补全,而 input 参数具备自动类型安全特性。

示例

Backend code
server/routers/_app.ts
tsx
import * as trpc from '@trpc/server';
import { z } from 'zod';
export const appRouter = trpc
.router()
// Create procedure at path 'hello'
.query('hello', {
// using zod schema to validate and infer input values
input: z
.object({
text: z.string().nullish(),
})
.nullish(),
resolve({ input }) {
return {
greeting: `hello ${input?.text ?? 'world'}`,
};
},
});
server/routers/_app.ts
tsx
import * as trpc from '@trpc/server';
import { z } from 'zod';
export const appRouter = trpc
.router()
// Create procedure at path 'hello'
.query('hello', {
// using zod schema to validate and infer input values
input: z
.object({
text: z.string().nullish(),
})
.nullish(),
resolve({ input }) {
return {
greeting: `hello ${input?.text ?? 'world'}`,
};
},
});
components/MyComponent.tsx
tsx
import { trpc } from '../utils/trpc';
export function MyComponent() {
// input is optional, so we don't have to pass second argument
const helloNoArgs = trpc.useQuery(['hello']);
const helloWithArgs = trpc.useQuery(['hello', { text: 'client' }]);
return (
<div>
<h1>Hello World Example</h1>
<ul>
<li>
helloNoArgs ({helloNoArgs.status}):{' '}
<pre>{JSON.stringify(helloNoArgs.data, null, 2)}</pre>
</li>
<li>
helloWithArgs ({helloWithArgs.status}):{' '}
<pre>{JSON.stringify(helloWithArgs.data, null, 2)}</pre>
</li>
</ul>
</div>
);
}
components/MyComponent.tsx
tsx
import { trpc } from '../utils/trpc';
export function MyComponent() {
// input is optional, so we don't have to pass second argument
const helloNoArgs = trpc.useQuery(['hello']);
const helloWithArgs = trpc.useQuery(['hello', { text: 'client' }]);
return (
<div>
<h1>Hello World Example</h1>
<ul>
<li>
helloNoArgs ({helloNoArgs.status}):{' '}
<pre>{JSON.stringify(helloNoArgs.data, null, 2)}</pre>
</li>
<li>
helloWithArgs ({helloWithArgs.status}):{' '}
<pre>{JSON.stringify(helloWithArgs.data, null, 2)}</pre>
</li>
</ul>
</div>
);
}