Struct VersionValidFor

pub struct VersionValidFor(/* private fields */);

Version-valid-for number (4 Bytes)

The 4-byte big-endian integer at offset 92 is the value of the change counter when the version number was stored. The integer at offset 92 indicates which transaction the version number is valid for and is sometimes called the “version-valid-for number”.

The entries at offsets 92 and 96 were added in later version of the SQLite library.

When an older version modifies the file, it will change the change counter (offset 24), but not adjust the version-valid-for number or the write library version number. So the library version number is no longer correct, because a different version last wrote to the file.

The version-valid-for number allows a new library to detect this case: if the change counter and the version-valid-for number do not match, then the write library version number is outdated, and must be ignored.

Reference: https://stackoverflow.com/a/45420823

Methods from Deref<Target = u32>

pub const MIN: u32 = 0u32

pub const MAX: u32 = 4_294_967_295u32

pub const BITS: u32 = 32u32

Trait Implementations

impl Debug for VersionValidFor

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

Formats the value using the given formatter.

impl Default for VersionValidFor

fn default() -> Self

Returns the “default value” for a type.

impl Deref for VersionValidFor

type Target = u32

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl Name for VersionValidFor

const NAME: &'static str = "VersionValidFor"