Trait sqlite_vfs::Vfs

source · [−]

pub trait Vfs {
    type File: File;
    fn open(&self, path: &Path, opts: OpenOptions) -> Result<Self::File, Error>;
    fn delete(&self, path: &Path) -> Result<(), Error>;
    fn exists(&self, path: &Path) -> Result<bool, Error>;

    fn access(&self, _path: &Path, _write: bool) -> Result<bool, Error> { ... }
}

Expand description

A virtual file system for SQLite.

Example

This example uses std::fs to to persist the database to disk.

struct FsVfs;

impl Vfs for FsVfs {
    type File = fs::File;

    fn open(&self, path: &Path, opts: OpenOptions) -> Result<Self::File, std::io::Error> {
        let mut o = fs::OpenOptions::new();
        o.read(true).write(opts.access != OpenAccess::Read);
        match opts.access {
            OpenAccess::Create => {
                o.create(true);
            }
            OpenAccess::CreateNew => {
                o.create_new(true);
            }
            _ => {}
        }
        let f = o.open(path)?;
        Ok(f)
    }

    fn delete(&self, path: &std::path::Path) -> Result<(), std::io::Error> {
        std::fs::remove_file(path)
    }

    fn exists(&self, path: &Path) -> Result<bool, std::io::Error> {
        Ok(path.is_file())
    }
}