28 releases
0.1.0-pre+beta.15 | Jul 16, 2022 |
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0.1.0-beta.14 | Jul 13, 2022 |
0.1.0-beta.8 | Jun 30, 2022 |
0.1.0-alpha.18 | May 27, 2022 |
0.1.0-alpha.4 | Mar 21, 2022 |
#98 in Database implementations
105 downloads per month
Used in doublets-decorators
150KB
4K
SLoC
Doublets
A library that represents database engine that uses doublets.
Overview
Example
A basic CRUD in doublets
use doublets::{
data::Flow::Continue,
mem::FileMappedMem,
unit, Doublets, Error
};
use std::fs::File;
fn main() -> Result<(), Error<usize>> {
// create or open read/write file
let file = File::options()
.create(true)
.read(true)
.write(true)
.open("db.links")?;
let mem = FileMappedMem::new(file)?;
let mut links = united::Store::<usize, _>::new(mem)?;
// Creation of the empty doublet in tiny style
let mut point = links.create()?;
// Update of the doublet in handler style
// The link is updated to reference itself twice (as source and target):
links.update_with(point, point, point, |_, after| {
// link is { index, source, target }
point = after.index;
// give handler state (any ops::Try)
Continue
})?;
// print all links from store
links.each(|link| {
println!("{link}");
Continue
});
// The link deletion in full style:
// `any` constant denotes any link
let any = links.constants().any;
// query in [index source target] style
// delete all links with index = point
links.delete_by_with([point, any, any], |before, _| {
println!("Goodbye {}", before);
Continue
})?;
Ok(())
}
Dependencies
~2–11MB
~145K SLoC