Class: PowerSyncTransactor

Defined in: PowerSyncTransactor.ts:54

Applies mutations to the PowerSync database. This method is called automatically by the collection's insert, update, and delete operations. You typically don't need to call this directly unless you have special transaction requirements.

Example

typescript

// Create a collection
const collection = createCollection(
  powerSyncCollectionOptions<Document>({
    database: db,
    table: APP_SCHEMA.props.documents,
  })
)

const addTx = createTransaction({
  autoCommit: false,
  mutationFn: async ({ transaction }) => {
    await new PowerSyncTransactor({ database: db }).applyTransaction(transaction)
  },
})

addTx.mutate(() => {
  for (let i = 0; i < 5; i++) {
    collection.insert({ id: randomUUID(), name: `tx-${i}` })
  }
})

await addTx.commit()
await addTx.isPersisted.promise

// Create a collection
const collection = createCollection(
  powerSyncCollectionOptions<Document>({
    database: db,
    table: APP_SCHEMA.props.documents,
  })
)

const addTx = createTransaction({
  autoCommit: false,
  mutationFn: async ({ transaction }) => {
    await new PowerSyncTransactor({ database: db }).applyTransaction(transaction)
  },
})

addTx.mutate(() => {
  for (let i = 0; i < 5; i++) {
    collection.insert({ id: randomUUID(), name: `tx-${i}` })
  }
})

await addTx.commit()
await addTx.isPersisted.promise

Param

The transaction containing mutations to apply

Constructors

Constructor

new PowerSyncTransactor(options): PowerSyncTransactor;

new PowerSyncTransactor(options): PowerSyncTransactor;

Defined in: PowerSyncTransactor.ts:58

Parameters

options

TransactorOptions

Returns

PowerSyncTransactor

Properties

database

database: AbstractPowerSyncDatabase;

database: AbstractPowerSyncDatabase;

Defined in: PowerSyncTransactor.ts:55

pendingOperationStore

pendingOperationStore: PendingOperationStore;

pendingOperationStore: PendingOperationStore;

Defined in: PowerSyncTransactor.ts:56

Methods

applyTransaction()

applyTransaction(transaction): Promise<void>;

applyTransaction(transaction): Promise<void>;

Defined in: PowerSyncTransactor.ts:66

Persists a Transaction to the PowerSync SQLite database.

Parameters

transaction

Transaction<any>

Returns

Promise<void>

getMutationCollectionMeta()

protected getMutationCollectionMeta(mutation): PowerSyncCollectionMeta<any>;

protected getMutationCollectionMeta(mutation): PowerSyncCollectionMeta<any>;

Defined in: PowerSyncTransactor.ts:297

Parameters

mutation

PendingMutation<any>

Returns

PowerSyncCollectionMeta<any>

handleDelete()

protected handleDelete(
   mutation, 
   context, 
waitForCompletion): Promise<PendingOperation | null>;

protected handleDelete(
   mutation, 
   context, 
waitForCompletion): Promise<PendingOperation | null>;

Defined in: PowerSyncTransactor.ts:223

Parameters

mutation

PendingMutation<any>

context

LockContext

waitForCompletion

boolean = false

Returns

Promise<PendingOperation | null>

handleInsert()

protected handleInsert(
   mutation, 
   context, 
waitForCompletion): Promise<PendingOperation | null>;

protected handleInsert(
   mutation, 
   context, 
waitForCompletion): Promise<PendingOperation | null>;

Defined in: PowerSyncTransactor.ts:152

Parameters

mutation

PendingMutation<any>

context

LockContext

waitForCompletion

boolean = false

Returns

Promise<PendingOperation | null>

handleOperationWithCompletion()

protected handleOperationWithCompletion(
   mutation, 
   context, 
   waitForCompletion, 
handler): Promise<PendingOperation | null>;

protected handleOperationWithCompletion(
   mutation, 
   context, 
   waitForCompletion, 
handler): Promise<PendingOperation | null>;

Defined in: PowerSyncTransactor.ts:266

Helper function which wraps a persistence operation by:

Fetching the mutation's collection's SQLite table details
Executing the mutation
Returning the last pending diff operation if required

Parameters

mutation

PendingMutation<any>

context

LockContext

waitForCompletion

boolean

handler

(tableName, mutation, serializeValue) => Promise<void>

Returns

Promise<PendingOperation | null>

handleUpdate()

protected handleUpdate(
   mutation, 
   context, 
waitForCompletion): Promise<PendingOperation | null>;

protected handleUpdate(
   mutation, 
   context, 
waitForCompletion): Promise<PendingOperation | null>;

Defined in: PowerSyncTransactor.ts:188

Parameters

mutation

PendingMutation<any>

context

LockContext

waitForCompletion

boolean = false

Returns

Promise<PendingOperation | null>

processMutationMetadata()

protected processMutationMetadata(mutation): string | null;

protected processMutationMetadata(mutation): string | null;

Defined in: PowerSyncTransactor.ts:316

Processes collection mutation metadata for persistence to the database. We only support storing string metadata.

Parameters

mutation

PendingMutation<any>

Returns

string | null

null if no metadata should be stored.