Queues

A queue providing serialized execution of work items on a database.

A database queue manages the execution of database operations to ensure they occur one at a time in FIFO order. This provides thread-safe database access.

Database operations may be submitted for synchronous or asynchronous execution.

The interface is similar to DispatchQueue and a dispatch queue is used internally for work item management.

let dbQueue = try DatabaseQueue()
try dbQueue.sync { db in
    // Do something with `db`
}

A database queue also supports transactions and savepoints:

dbQueue.transaction { db in
    // All database operations here are contained within a transaction
    return .commit
}

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public final class DatabaseQueue

A queue providing serialized execution of read operations on a database.

Normally read queues are used for concurrent read access to databases using WAL mode.

A database read queue manages the execution of read-only database operations to ensure they occur one at a time in FIFO order. This provides thread-safe database access.

Database read operations may be submitted for synchronous or asynchronous execution.

It is possible to maintain a consistent snapshot of a database using read transactions. Changes committed to a database are not visible within a read transaction until the transaction is updated or restarted.

The interface is similar to DispatchQueue and a dispatch queue is used internally for work item management.

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public final class DatabaseReadQueue