Enum FileControl 

#[non_exhaustive]
pub enum FileControl<'p> {
    SizeHint(&'p mut sqlite3_int64),
    SizeLimit(&'p mut sqlite3_int64),
    ChunkSize(&'p mut c_int),
    PersistWal(&'p mut c_int),
    PowerSafeOverwrite(&'p mut c_int),
    MMapSize(&'p mut sqlite3_int64),
    HasMoved(&'p mut c_int),
    LockTimeout(&'p mut c_int),
    BlockOnConnect(&'p mut c_int),
    DataVersion(&'p mut c_uint),
    ReserveBytes(&'p mut c_int),
}

Standard File Control Opcodes

See https://sqlite.org/c3ref/c_fcntl_begin_atomic_write.html for explanations of each.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

SizeHint(&'p mut sqlite3_int64)

Give the VFS layer a hint of how large the database file will grow to be during the current transaction.

SizeLimit(&'p mut sqlite3_int64)

Used by in-memory VFS that implements sqlite3_deserialize() to set an upper bound on the size of the in-memory database.

ChunkSize(&'p mut c_int)

Used to request that the VFS extends and truncates the database file in chunks of a size specified by the user.

PersistWal(&'p mut c_int)

Used to set or query the persistent Write Ahead Log setting.

PowerSafeOverwrite(&'p mut c_int)

Used to set or query the persistent “powersafe-overwrite” or “PSOW” setting.

MMapSize(&'p mut sqlite3_int64)

Used to query or set the maximum number of bytes that will be used for memory-mapped I/O.

HasMoved(&'p mut c_int)

Whether or not the file has been renamed, moved, or deleted since it was first opened.

LockTimeout(&'p mut c_int)

Used to configure a VFS to block for up to M milliseconds before failing when attempting to obtain a file lock using the xLock or xShmLock methods of the VFS.

BlockOnConnect(&'p mut c_int)

Used to configure the VFS to block when taking a SHARED lock to connect to a wal mode database.

DataVersion(&'p mut c_uint)

Detect changes to a database file.

ReserveBytes(&'p mut c_int)

Used to query or set the reserve bytes

Trait Implementations

impl<'p> Debug for FileControl<'p>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.