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useLiveQuery | TanStack DB React Docs

function useLiveQuery<TContext>(queryFn, deps?): object;
function useLiveQuery<TContext>(queryFn, deps?): object;

Defined in: useLiveQuery.ts:84

Create a live query using a query function

Type Parameters

TContext

TContext extends Context

Parameters

queryFn

(q) => QueryBuilder<TContext>

Query function that defines what data to fetch

deps?

unknown[]

Array of dependencies that trigger query re-execution when changed

Returns

object

Object with reactive data, state, and status information

collection

collection: Collection<{ [K in string | number | symbol]: ResultValue<TContext>[K] }, string | number, {
}>;
collection: Collection<{ [K in string | number | symbol]: ResultValue<TContext>[K] }, string | number, {
}>;

data

data: InferResultType<TContext>;
data: InferResultType<TContext>;

isCleanedUp

isCleanedUp: boolean;
isCleanedUp: boolean;

isEnabled

isEnabled: true;
isEnabled: true;

isError

isError: boolean;
isError: boolean;

isIdle

isIdle: boolean;
isIdle: boolean;

isLoading

isLoading: boolean;
isLoading: boolean;

isReady

isReady: boolean;
isReady: boolean;

state

state: Map<string | number, { [K in string | number | symbol]: ResultValue<TContext>[K] }>;
state: Map<string | number, { [K in string | number | symbol]: ResultValue<TContext>[K] }>;

status

status: CollectionStatus;
status: CollectionStatus;

Examples

// Basic query with object syntax
const { data, isLoading } = useLiveQuery((q) =>
  q.from({ todos: todosCollection })
   .where(({ todos }) => eq(todos.completed, false))
   .select(({ todos }) => ({ id: todos.id, text: todos.text }))
)
// Basic query with object syntax
const { data, isLoading } = useLiveQuery((q) =>
  q.from({ todos: todosCollection })
   .where(({ todos }) => eq(todos.completed, false))
   .select(({ todos }) => ({ id: todos.id, text: todos.text }))
)
// Single result query
const { data } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => eq(todos.id, 1))
         .findOne()
)
// Single result query
const { data } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => eq(todos.id, 1))
         .findOne()
)
// With dependencies that trigger re-execution
const { data, state } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => gt(todos.priority, minPriority)),
  [minPriority] // Re-run when minPriority changes
)
// With dependencies that trigger re-execution
const { data, state } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => gt(todos.priority, minPriority)),
  [minPriority] // Re-run when minPriority changes
)
// Join pattern
const { data } = useLiveQuery((q) =>
  q.from({ issues: issueCollection })
   .join({ persons: personCollection }, ({ issues, persons }) =>
     eq(issues.userId, persons.id)
   )
   .select(({ issues, persons }) => ({
     id: issues.id,
     title: issues.title,
     userName: persons.name
   }))
)
// Join pattern
const { data } = useLiveQuery((q) =>
  q.from({ issues: issueCollection })
   .join({ persons: personCollection }, ({ issues, persons }) =>
     eq(issues.userId, persons.id)
   )
   .select(({ issues, persons }) => ({
     id: issues.id,
     title: issues.title,
     userName: persons.name
   }))
)
// Handle loading and error states
const { data, isLoading, isError, status } = useLiveQuery((q) =>
  q.from({ todos: todoCollection })
)

if (isLoading) return <div>Loading...</div>
if (isError) return <div>Error: {status}</div>

return (
  <ul>
    {data.map(todo => <li key={todo.id}>{todo.text}</li>)}
  </ul>
)
// Handle loading and error states
const { data, isLoading, isError, status } = useLiveQuery((q) =>
  q.from({ todos: todoCollection })
)

if (isLoading) return <div>Loading...</div>
if (isError) return <div>Error: {status}</div>

return (
  <ul>
    {data.map(todo => <li key={todo.id}>{todo.text}</li>)}
  </ul>
)
function useLiveQuery<TContext>(queryFn, deps?): object;
function useLiveQuery<TContext>(queryFn, deps?): object;

Defined in: useLiveQuery.ts:101

Create a live query using a query function

Type Parameters

TContext

TContext extends Context

Parameters

queryFn

(q) => QueryBuilder<TContext> | null | undefined

Query function that defines what data to fetch

deps?

unknown[]

Array of dependencies that trigger query re-execution when changed

Returns

object

Object with reactive data, state, and status information

collection

collection: 
  | Collection<{ [K in string | number | symbol]: ResultValue<TContext>[K] }, string | number, {
}, StandardSchemaV1<unknown, unknown>, { [K in string | number | symbol]: ResultValue<TContext>[K] }>
  | undefined;
collection: 
  | Collection<{ [K in string | number | symbol]: ResultValue<TContext>[K] }, string | number, {
}, StandardSchemaV1<unknown, unknown>, { [K in string | number | symbol]: ResultValue<TContext>[K] }>
  | undefined;

data

data: InferResultType<TContext> | undefined;
data: InferResultType<TContext> | undefined;

isCleanedUp

isCleanedUp: boolean;
isCleanedUp: boolean;

isEnabled

isEnabled: boolean;
isEnabled: boolean;

isError

isError: boolean;
isError: boolean;

isIdle

isIdle: boolean;
isIdle: boolean;

isLoading

isLoading: boolean;
isLoading: boolean;

isReady

isReady: boolean;
isReady: boolean;

state

state: 
  | Map<string | number, { [K in string | number | symbol]: ResultValue<TContext>[K] }>
  | undefined;
state: 
  | Map<string | number, { [K in string | number | symbol]: ResultValue<TContext>[K] }>
  | undefined;

status

status: UseLiveQueryStatus;
status: UseLiveQueryStatus;

Examples

// Basic query with object syntax
const { data, isLoading } = useLiveQuery((q) =>
  q.from({ todos: todosCollection })
   .where(({ todos }) => eq(todos.completed, false))
   .select(({ todos }) => ({ id: todos.id, text: todos.text }))
)
// Basic query with object syntax
const { data, isLoading } = useLiveQuery((q) =>
  q.from({ todos: todosCollection })
   .where(({ todos }) => eq(todos.completed, false))
   .select(({ todos }) => ({ id: todos.id, text: todos.text }))
)
// Single result query
const { data } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => eq(todos.id, 1))
         .findOne()
)
// Single result query
const { data } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => eq(todos.id, 1))
         .findOne()
)
// With dependencies that trigger re-execution
const { data, state } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => gt(todos.priority, minPriority)),
  [minPriority] // Re-run when minPriority changes
)
// With dependencies that trigger re-execution
const { data, state } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => gt(todos.priority, minPriority)),
  [minPriority] // Re-run when minPriority changes
)
// Join pattern
const { data } = useLiveQuery((q) =>
  q.from({ issues: issueCollection })
   .join({ persons: personCollection }, ({ issues, persons }) =>
     eq(issues.userId, persons.id)
   )
   .select(({ issues, persons }) => ({
     id: issues.id,
     title: issues.title,
     userName: persons.name
   }))
)
// Join pattern
const { data } = useLiveQuery((q) =>
  q.from({ issues: issueCollection })
   .join({ persons: personCollection }, ({ issues, persons }) =>
     eq(issues.userId, persons.id)
   )
   .select(({ issues, persons }) => ({
     id: issues.id,
     title: issues.title,
     userName: persons.name
   }))
)
// Handle loading and error states
const { data, isLoading, isError, status } = useLiveQuery((q) =>
  q.from({ todos: todoCollection })
)

if (isLoading) return <div>Loading...</div>
if (isError) return <div>Error: {status}</div>

return (
  <ul>
    {data.map(todo => <li key={todo.id}>{todo.text}</li>)}
  </ul>
)
// Handle loading and error states
const { data, isLoading, isError, status } = useLiveQuery((q) =>
  q.from({ todos: todoCollection })
)

if (isLoading) return <div>Loading...</div>
if (isError) return <div>Error: {status}</div>

return (
  <ul>
    {data.map(todo => <li key={todo.id}>{todo.text}</li>)}
  </ul>
)
function useLiveQuery<TContext>(queryFn, deps?): object;
function useLiveQuery<TContext>(queryFn, deps?): object;

Defined in: useLiveQuery.ts:120

Create a live query using a query function

Type Parameters

TContext

TContext extends Context

Parameters

queryFn

(q) => | LiveQueryCollectionConfig<TContext, RootQueryResult<TContext>> | null | undefined

Query function that defines what data to fetch

deps?

unknown[]

Array of dependencies that trigger query re-execution when changed

Returns

object

Object with reactive data, state, and status information

collection

collection: 
  | Collection<{ [K in string | number | symbol]: ResultValue<TContext>[K] }, string | number, {
}, StandardSchemaV1<unknown, unknown>, { [K in string | number | symbol]: ResultValue<TContext>[K] }>
  | undefined;
collection: 
  | Collection<{ [K in string | number | symbol]: ResultValue<TContext>[K] }, string | number, {
}, StandardSchemaV1<unknown, unknown>, { [K in string | number | symbol]: ResultValue<TContext>[K] }>
  | undefined;

data

data: InferResultType<TContext> | undefined;
data: InferResultType<TContext> | undefined;

isCleanedUp

isCleanedUp: boolean;
isCleanedUp: boolean;

isEnabled

isEnabled: boolean;
isEnabled: boolean;

isError

isError: boolean;
isError: boolean;

isIdle

isIdle: boolean;
isIdle: boolean;

isLoading

isLoading: boolean;
isLoading: boolean;

isReady

isReady: boolean;
isReady: boolean;

state

state: 
  | Map<string | number, { [K in string | number | symbol]: ResultValue<TContext>[K] }>
  | undefined;
state: 
  | Map<string | number, { [K in string | number | symbol]: ResultValue<TContext>[K] }>
  | undefined;

status

status: UseLiveQueryStatus;
status: UseLiveQueryStatus;

Examples

// Basic query with object syntax
const { data, isLoading } = useLiveQuery((q) =>
  q.from({ todos: todosCollection })
   .where(({ todos }) => eq(todos.completed, false))
   .select(({ todos }) => ({ id: todos.id, text: todos.text }))
)
// Basic query with object syntax
const { data, isLoading } = useLiveQuery((q) =>
  q.from({ todos: todosCollection })
   .where(({ todos }) => eq(todos.completed, false))
   .select(({ todos }) => ({ id: todos.id, text: todos.text }))
)
// Single result query
const { data } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => eq(todos.id, 1))
         .findOne()
)
// Single result query
const { data } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => eq(todos.id, 1))
         .findOne()
)
// With dependencies that trigger re-execution
const { data, state } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => gt(todos.priority, minPriority)),
  [minPriority] // Re-run when minPriority changes
)
// With dependencies that trigger re-execution
const { data, state } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => gt(todos.priority, minPriority)),
  [minPriority] // Re-run when minPriority changes
)
// Join pattern
const { data } = useLiveQuery((q) =>
  q.from({ issues: issueCollection })
   .join({ persons: personCollection }, ({ issues, persons }) =>
     eq(issues.userId, persons.id)
   )
   .select(({ issues, persons }) => ({
     id: issues.id,
     title: issues.title,
     userName: persons.name
   }))
)
// Join pattern
const { data } = useLiveQuery((q) =>
  q.from({ issues: issueCollection })
   .join({ persons: personCollection }, ({ issues, persons }) =>
     eq(issues.userId, persons.id)
   )
   .select(({ issues, persons }) => ({
     id: issues.id,
     title: issues.title,
     userName: persons.name
   }))
)
// Handle loading and error states
const { data, isLoading, isError, status } = useLiveQuery((q) =>
  q.from({ todos: todoCollection })
)

if (isLoading) return <div>Loading...</div>
if (isError) return <div>Error: {status}</div>

return (
  <ul>
    {data.map(todo => <li key={todo.id}>{todo.text}</li>)}
  </ul>
)
// Handle loading and error states
const { data, isLoading, isError, status } = useLiveQuery((q) =>
  q.from({ todos: todoCollection })
)

if (isLoading) return <div>Loading...</div>
if (isError) return <div>Error: {status}</div>

return (
  <ul>
    {data.map(todo => <li key={todo.id}>{todo.text}</li>)}
  </ul>
)
function useLiveQuery<TResult, TKey, TUtils>(queryFn, deps?): object;
function useLiveQuery<TResult, TKey, TUtils>(queryFn, deps?): object;

Defined in: useLiveQuery.ts:139

Create a live query using a query function

Type Parameters

TResult

TResult extends object

TKey

TKey extends string | number

TUtils

TUtils extends Record<string, any>

Parameters

queryFn

(q) => | Collection<TResult, TKey, TUtils, StandardSchemaV1<unknown, unknown>, TResult> | null | undefined

Query function that defines what data to fetch

deps?

unknown[]

Array of dependencies that trigger query re-execution when changed

Returns

object

Object with reactive data, state, and status information

collection

collection: 
  | Collection<TResult, TKey, TUtils, StandardSchemaV1<unknown, unknown>, TResult>
  | undefined;
collection: 
  | Collection<TResult, TKey, TUtils, StandardSchemaV1<unknown, unknown>, TResult>
  | undefined;

data

data: TResult[] | undefined;
data: TResult[] | undefined;

isCleanedUp

isCleanedUp: boolean;
isCleanedUp: boolean;

isEnabled

isEnabled: boolean;
isEnabled: boolean;

isError

isError: boolean;
isError: boolean;

isIdle

isIdle: boolean;
isIdle: boolean;

isLoading

isLoading: boolean;
isLoading: boolean;

isReady

isReady: boolean;
isReady: boolean;

state

state: Map<TKey, TResult> | undefined;
state: Map<TKey, TResult> | undefined;

status

status: UseLiveQueryStatus;
status: UseLiveQueryStatus;

Examples

// Basic query with object syntax
const { data, isLoading } = useLiveQuery((q) =>
  q.from({ todos: todosCollection })
   .where(({ todos }) => eq(todos.completed, false))
   .select(({ todos }) => ({ id: todos.id, text: todos.text }))
)
// Basic query with object syntax
const { data, isLoading } = useLiveQuery((q) =>
  q.from({ todos: todosCollection })
   .where(({ todos }) => eq(todos.completed, false))
   .select(({ todos }) => ({ id: todos.id, text: todos.text }))
)
// Single result query
const { data } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => eq(todos.id, 1))
         .findOne()
)
// Single result query
const { data } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => eq(todos.id, 1))
         .findOne()
)
// With dependencies that trigger re-execution
const { data, state } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => gt(todos.priority, minPriority)),
  [minPriority] // Re-run when minPriority changes
)
// With dependencies that trigger re-execution
const { data, state } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => gt(todos.priority, minPriority)),
  [minPriority] // Re-run when minPriority changes
)
// Join pattern
const { data } = useLiveQuery((q) =>
  q.from({ issues: issueCollection })
   .join({ persons: personCollection }, ({ issues, persons }) =>
     eq(issues.userId, persons.id)
   )
   .select(({ issues, persons }) => ({
     id: issues.id,
     title: issues.title,
     userName: persons.name
   }))
)
// Join pattern
const { data } = useLiveQuery((q) =>
  q.from({ issues: issueCollection })
   .join({ persons: personCollection }, ({ issues, persons }) =>
     eq(issues.userId, persons.id)
   )
   .select(({ issues, persons }) => ({
     id: issues.id,
     title: issues.title,
     userName: persons.name
   }))
)
// Handle loading and error states
const { data, isLoading, isError, status } = useLiveQuery((q) =>
  q.from({ todos: todoCollection })
)

if (isLoading) return <div>Loading...</div>
if (isError) return <div>Error: {status}</div>

return (
  <ul>
    {data.map(todo => <li key={todo.id}>{todo.text}</li>)}
  </ul>
)
// Handle loading and error states
const { data, isLoading, isError, status } = useLiveQuery((q) =>
  q.from({ todos: todoCollection })
)

if (isLoading) return <div>Loading...</div>
if (isError) return <div>Error: {status}</div>

return (
  <ul>
    {data.map(todo => <li key={todo.id}>{todo.text}</li>)}
  </ul>
)
function useLiveQuery<TContext, TResult, TKey, TUtils>(queryFn, deps?): object;
function useLiveQuery<TContext, TResult, TKey, TUtils>(queryFn, deps?): object;

Defined in: useLiveQuery.ts:162

Create a live query using a query function

Type Parameters

TContext

TContext extends Context

TResult

TResult extends object

TKey

TKey extends string | number

TUtils

TUtils extends Record<string, any>

Parameters

queryFn

(q) => | QueryBuilder<TContext> | LiveQueryCollectionConfig<TContext, RootQueryResult<TContext>> | Collection<TResult, TKey, TUtils, StandardSchemaV1<unknown, unknown>, TResult> | null | undefined

Query function that defines what data to fetch

deps?

unknown[]

Array of dependencies that trigger query re-execution when changed

Returns

object

Object with reactive data, state, and status information

collection

collection: 
  | Collection<TResult, TKey, TUtils, StandardSchemaV1<unknown, unknown>, TResult>
  | Collection<{ [K in string | number | symbol]: ResultValue<TContext>[K] }, string | number, {
}, StandardSchemaV1<unknown, unknown>, { [K in string | number | symbol]: ResultValue<TContext>[K] }>
  | undefined;
collection: 
  | Collection<TResult, TKey, TUtils, StandardSchemaV1<unknown, unknown>, TResult>
  | Collection<{ [K in string | number | symbol]: ResultValue<TContext>[K] }, string | number, {
}, StandardSchemaV1<unknown, unknown>, { [K in string | number | symbol]: ResultValue<TContext>[K] }>
  | undefined;

data

data: InferResultType<TContext> | TResult[] | undefined;
data: InferResultType<TContext> | TResult[] | undefined;

isCleanedUp

isCleanedUp: boolean;
isCleanedUp: boolean;

isEnabled

isEnabled: boolean;
isEnabled: boolean;

isError

isError: boolean;
isError: boolean;

isIdle

isIdle: boolean;
isIdle: boolean;

isLoading

isLoading: boolean;
isLoading: boolean;

isReady

isReady: boolean;
isReady: boolean;

state

state: 
  | Map<string | number, { [K in string | number | symbol]: ResultValue<TContext>[K] }>
  | Map<TKey, TResult>
  | undefined;
state: 
  | Map<string | number, { [K in string | number | symbol]: ResultValue<TContext>[K] }>
  | Map<TKey, TResult>
  | undefined;

status

status: UseLiveQueryStatus;
status: UseLiveQueryStatus;

Examples

// Basic query with object syntax
const { data, isLoading } = useLiveQuery((q) =>
  q.from({ todos: todosCollection })
   .where(({ todos }) => eq(todos.completed, false))
   .select(({ todos }) => ({ id: todos.id, text: todos.text }))
)
// Basic query with object syntax
const { data, isLoading } = useLiveQuery((q) =>
  q.from({ todos: todosCollection })
   .where(({ todos }) => eq(todos.completed, false))
   .select(({ todos }) => ({ id: todos.id, text: todos.text }))
)
// Single result query
const { data } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => eq(todos.id, 1))
         .findOne()
)
// Single result query
const { data } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => eq(todos.id, 1))
         .findOne()
)
// With dependencies that trigger re-execution
const { data, state } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => gt(todos.priority, minPriority)),
  [minPriority] // Re-run when minPriority changes
)
// With dependencies that trigger re-execution
const { data, state } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => gt(todos.priority, minPriority)),
  [minPriority] // Re-run when minPriority changes
)
// Join pattern
const { data } = useLiveQuery((q) =>
  q.from({ issues: issueCollection })
   .join({ persons: personCollection }, ({ issues, persons }) =>
     eq(issues.userId, persons.id)
   )
   .select(({ issues, persons }) => ({
     id: issues.id,
     title: issues.title,
     userName: persons.name
   }))
)
// Join pattern
const { data } = useLiveQuery((q) =>
  q.from({ issues: issueCollection })
   .join({ persons: personCollection }, ({ issues, persons }) =>
     eq(issues.userId, persons.id)
   )
   .select(({ issues, persons }) => ({
     id: issues.id,
     title: issues.title,
     userName: persons.name
   }))
)
// Handle loading and error states
const { data, isLoading, isError, status } = useLiveQuery((q) =>
  q.from({ todos: todoCollection })
)

if (isLoading) return <div>Loading...</div>
if (isError) return <div>Error: {status}</div>

return (
  <ul>
    {data.map(todo => <li key={todo.id}>{todo.text}</li>)}
  </ul>
)
// Handle loading and error states
const { data, isLoading, isError, status } = useLiveQuery((q) =>
  q.from({ todos: todoCollection })
)

if (isLoading) return <div>Loading...</div>
if (isError) return <div>Error: {status}</div>

return (
  <ul>
    {data.map(todo => <li key={todo.id}>{todo.text}</li>)}
  </ul>
)
function useLiveQuery<TContext>(config, deps?): object;
function useLiveQuery<TContext>(config, deps?): object;

Defined in: useLiveQuery.ts:230

Create a live query using configuration object

Type Parameters

TContext

TContext extends Context

Parameters

config

LiveQueryCollectionConfig<TContext>

Configuration object with query and options

deps?

unknown[]

Array of dependencies that trigger query re-execution when changed

Returns

object

Object with reactive data, state, and status information

collection

collection: Collection<{ [K in string | number | symbol]: ResultValue<TContext>[K] }, string | number, {
}>;
collection: Collection<{ [K in string | number | symbol]: ResultValue<TContext>[K] }, string | number, {
}>;

data

data: InferResultType<TContext>;
data: InferResultType<TContext>;

isCleanedUp

isCleanedUp: boolean;
isCleanedUp: boolean;

isEnabled

isEnabled: true;
isEnabled: true;

isError

isError: boolean;
isError: boolean;

isIdle

isIdle: boolean;
isIdle: boolean;

isLoading

isLoading: boolean;
isLoading: boolean;

isReady

isReady: boolean;
isReady: boolean;

state

state: Map<string | number, { [K in string | number | symbol]: ResultValue<TContext>[K] }>;
state: Map<string | number, { [K in string | number | symbol]: ResultValue<TContext>[K] }>;

status

status: CollectionStatus;
status: CollectionStatus;

Examples

// Basic config object usage
const { data, status } = useLiveQuery({
  query: (q) => q.from({ todos: todosCollection }),
  gcTime: 60000
})
// Basic config object usage
const { data, status } = useLiveQuery({
  query: (q) => q.from({ todos: todosCollection }),
  gcTime: 60000
})
// With query builder and options
const queryBuilder = new Query()
  .from({ persons: collection })
  .where(({ persons }) => gt(persons.age, 30))
  .select(({ persons }) => ({ id: persons.id, name: persons.name }))

const { data, isReady } = useLiveQuery({ query: queryBuilder })
// With query builder and options
const queryBuilder = new Query()
  .from({ persons: collection })
  .where(({ persons }) => gt(persons.age, 30))
  .select(({ persons }) => ({ id: persons.id, name: persons.name }))

const { data, isReady } = useLiveQuery({ query: queryBuilder })
// Handle all states uniformly
const { data, isLoading, isReady, isError } = useLiveQuery({
  query: (q) => q.from({ items: itemCollection })
})

if (isLoading) return <div>Loading...</div>
if (isError) return <div>Something went wrong</div>
if (!isReady) return <div>Preparing...</div>

return <div>{data.length} items loaded</div>
// Handle all states uniformly
const { data, isLoading, isReady, isError } = useLiveQuery({
  query: (q) => q.from({ items: itemCollection })
})

if (isLoading) return <div>Loading...</div>
if (isError) return <div>Something went wrong</div>
if (!isReady) return <div>Preparing...</div>

return <div>{data.length} items loaded</div>
function useLiveQuery<TResult, TKey, TUtils>(liveQueryCollection): object;
function useLiveQuery<TResult, TKey, TUtils>(liveQueryCollection): object;

Defined in: useLiveQuery.ts:276

Subscribe to an existing live query collection

Type Parameters

TResult

TResult extends object

TKey

TKey extends string | number

TUtils

TUtils extends Record<string, any>

Parameters

liveQueryCollection

Collection<TResult, TKey, TUtils, StandardSchemaV1<unknown, unknown>, TResult> & NonSingleResult

Pre-created live query collection to subscribe to

Returns

object

Object with reactive data, state, and status information

collection

collection: Collection<TResult, TKey, TUtils>;
collection: Collection<TResult, TKey, TUtils>;

data

data: TResult[];
data: TResult[];

isCleanedUp

isCleanedUp: boolean;
isCleanedUp: boolean;

isEnabled

isEnabled: true;
isEnabled: true;

isError

isError: boolean;
isError: boolean;

isIdle

isIdle: boolean;
isIdle: boolean;

isLoading

isLoading: boolean;
isLoading: boolean;

isReady

isReady: boolean;
isReady: boolean;

state

state: Map<TKey, TResult>;
state: Map<TKey, TResult>;

status

status: CollectionStatus;
status: CollectionStatus;

Examples

// Using pre-created live query collection
const myLiveQuery = createLiveQueryCollection((q) =>
  q.from({ todos: todosCollection }).where(({ todos }) => eq(todos.active, true))
)
const { data, collection } = useLiveQuery(myLiveQuery)
// Using pre-created live query collection
const myLiveQuery = createLiveQueryCollection((q) =>
  q.from({ todos: todosCollection }).where(({ todos }) => eq(todos.active, true))
)
const { data, collection } = useLiveQuery(myLiveQuery)
// Access collection methods directly
const { data, collection, isReady } = useLiveQuery(existingCollection)

// Use collection for mutations
const handleToggle = (id) => {
  collection.update(id, draft => { draft.completed = !draft.completed })
}
// Access collection methods directly
const { data, collection, isReady } = useLiveQuery(existingCollection)

// Use collection for mutations
const handleToggle = (id) => {
  collection.update(id, draft => { draft.completed = !draft.completed })
}
// Handle states consistently
const { data, isLoading, isError } = useLiveQuery(sharedCollection)

if (isLoading) return <div>Loading...</div>
if (isError) return <div>Error loading data</div>

return <div>{data.map(item => <Item key={item.id} {...item} />)}</div>
// Handle states consistently
const { data, isLoading, isError } = useLiveQuery(sharedCollection)

if (isLoading) return <div>Loading...</div>
if (isError) return <div>Error loading data</div>

return <div>{data.map(item => <Item key={item.id} {...item} />)}</div>
function useLiveQuery<TResult, TKey, TUtils>(liveQueryCollection): object;
function useLiveQuery<TResult, TKey, TUtils>(liveQueryCollection): object;

Defined in: useLiveQuery.ts:296

Create a live query using a query function

Type Parameters

TResult

TResult extends object

TKey

TKey extends string | number

TUtils

TUtils extends Record<string, any>

Parameters

liveQueryCollection

Collection<TResult, TKey, TUtils, StandardSchemaV1<unknown, unknown>, TResult> & SingleResult

Returns

object

Object with reactive data, state, and status information

collection

collection: Collection<TResult, TKey, TUtils, StandardSchemaV1<unknown, unknown>, TResult> & SingleResult;
collection: Collection<TResult, TKey, TUtils, StandardSchemaV1<unknown, unknown>, TResult> & SingleResult;

data

data: TResult | undefined;
data: TResult | undefined;

isCleanedUp

isCleanedUp: boolean;
isCleanedUp: boolean;

isEnabled

isEnabled: true;
isEnabled: true;

isError

isError: boolean;
isError: boolean;

isIdle

isIdle: boolean;
isIdle: boolean;

isLoading

isLoading: boolean;
isLoading: boolean;

isReady

isReady: boolean;
isReady: boolean;

state

state: Map<TKey, TResult>;
state: Map<TKey, TResult>;

status

status: CollectionStatus;
status: CollectionStatus;

Examples

// Basic query with object syntax
const { data, isLoading } = useLiveQuery((q) =>
  q.from({ todos: todosCollection })
   .where(({ todos }) => eq(todos.completed, false))
   .select(({ todos }) => ({ id: todos.id, text: todos.text }))
)
// Basic query with object syntax
const { data, isLoading } = useLiveQuery((q) =>
  q.from({ todos: todosCollection })
   .where(({ todos }) => eq(todos.completed, false))
   .select(({ todos }) => ({ id: todos.id, text: todos.text }))
)
// Single result query
const { data } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => eq(todos.id, 1))
         .findOne()
)
// Single result query
const { data } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => eq(todos.id, 1))
         .findOne()
)
// With dependencies that trigger re-execution
const { data, state } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => gt(todos.priority, minPriority)),
  [minPriority] // Re-run when minPriority changes
)
// With dependencies that trigger re-execution
const { data, state } = useLiveQuery(
  (q) => q.from({ todos: todosCollection })
         .where(({ todos }) => gt(todos.priority, minPriority)),
  [minPriority] // Re-run when minPriority changes
)
// Join pattern
const { data } = useLiveQuery((q) =>
  q.from({ issues: issueCollection })
   .join({ persons: personCollection }, ({ issues, persons }) =>
     eq(issues.userId, persons.id)
   )
   .select(({ issues, persons }) => ({
     id: issues.id,
     title: issues.title,
     userName: persons.name
   }))
)
// Join pattern
const { data } = useLiveQuery((q) =>
  q.from({ issues: issueCollection })
   .join({ persons: personCollection }, ({ issues, persons }) =>
     eq(issues.userId, persons.id)
   )
   .select(({ issues, persons }) => ({
     id: issues.id,
     title: issues.title,
     userName: persons.name
   }))
)
// Handle loading and error states
const { data, isLoading, isError, status } = useLiveQuery((q) =>
  q.from({ todos: todoCollection })
)

if (isLoading) return <div>Loading...</div>
if (isError) return <div>Error: {status}</div>

return (
  <ul>
    {data.map(todo => <li key={todo.id}>{todo.text}</li>)}
  </ul>
)
// Handle loading and error states
const { data, isLoading, isError, status } = useLiveQuery((q) =>
  q.from({ todos: todoCollection })
)

if (isLoading) return <div>Loading...</div>
if (isError) return <div>Error: {status}</div>

return (
  <ul>
    {data.map(todo => <li key={todo.id}>{todo.text}</li>)}
  </ul>
)