Enum OpenMode 

pub enum OpenMode {
    Read,
    ReadWrite,
    Create,
    CreateNew,
}

How a file is opened.

Variants

Read

Must exist. Reads only, and a write is an error.

ReadWrite

Must exist. Reads and writes.

Create

Created if it does not exist, opened if it does.

CreateNew

Created, and an error if it already exists.

The one that matters for a database file, because “create the database” and “open the database that is already there” are different intentions and collapsing them is how a process ends up writing a header over somebody’s data.

Implementations

impl OpenMode

pub fn writable(self) -> bool

Whether a write through a handle opened this way is allowed.

Trait Implementations

impl Clone for OpenMode

fn clone(&self) -> OpenMode

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for OpenMode

impl Debug for OpenMode

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

Formats the value using the given formatter.

impl Eq for OpenMode

impl PartialEq for OpenMode

fn eq(&self, other: &OpenMode) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for OpenMode