并行查询
“并行”查询是指同时执行的查询，以最大化获取并发性。
手动并行查询
当并行查询的数量不变时，使用并行查询无需额外工作。只需并排使用任意数量的 TanStack Query 的 injectQuery 和 injectInfiniteQuery 函数即可！
ts
export class AppComponent {
// The following queries will execute in parallel
usersQuery = injectQuery(() => ({ queryKey: ['users'], queryFn: fetchUsers }))
teamsQuery = injectQuery(() => ({ queryKey: ['teams'], queryFn: fetchTeams }))
projectsQuery = injectQuery(() => ({
queryKey: ['projects'],
queryFn: fetchProjects,
}))
}
export class AppComponent {
// The following queries will execute in parallel
usersQuery = injectQuery(() => ({ queryKey: ['users'], queryFn: fetchUsers }))
teamsQuery = injectQuery(() => ({ queryKey: ['teams'], queryFn: fetchTeams }))
projectsQuery = injectQuery(() => ({
queryKey: ['projects'],
queryFn: fetchProjects,
}))
}
使用 injectQueries 的动态并行查询
TanStack Query 提供了 injectQueries，您可以使用它来动态并行执行任意数量的查询。
injectQueries 接受一个选项对象，其中包含一个 queries 键，其值是查询对象数组。它返回一个查询结果数组
ts
export class AppComponent {
users = signal<Array<User>>([])
// Please note injectQueries is under development and this code does not work yet
userQueries = injectQueries(() => ({
queries: users().map((user) => {
return {
queryKey: ['user', user.id],
queryFn: () => fetchUserById(user.id),
}
}),
}))
}
export class AppComponent {
users = signal<Array<User>>([])
// Please note injectQueries is under development and this code does not work yet
userQueries = injectQueries(() => ({
queries: users().map((user) => {
return {
queryKey: ['user', user.id],
queryFn: () => fetchUserById(user.id),
}
}),
}))
}
