Crate siamesedb

source · [−]

Expand description

The simple local key-value store.

Features

key-value store.
in-memory and file store.
DbMapDbString has keys as utf-8 string.
DbMapDbInt has keys as u64.
DbMapDbBytes has keys as Vec.
The value is any bytes included utf-8 string.
The file store is implemented the basic B-Tree. (no leaf)
The file store is included the htx file that is hash cache table for performance.
Small db file size.
Separated files. (key file, value file, index file and htx file)
One database has some db-map-string and some db-map-int and some db-map-bytes.
Swiss army knife with easy-to-use and good performance
minimum support rustc rustc 1.53.0 (53cb7b09b 2021-06-17)

Compatibility

Nothing?

Todo

more performance
DB lock as support for multi-process-safe

Low priority todo

transaction support that handles multiple key-space at a time.
thread-safe support
non db lock multi-process-safe support

Examples

Example DbMapDbString:

use siamesedb::{DbMapDbString, DbXxx, DbXxxBase, DbXxxObjectSafe};

fn main() -> std::io::Result<()> {
    let db_name = "target/tmp/doc-test1.siamesedb";
    // remove database
    let _ = std::fs::remove_dir_all(db_name);
    // create or open database
    let db = siamesedb::open_file(db_name)?;
    // create or get db map
    let mut db_map = db.db_map_string("some_map1")?;
    //
    let r = db_map.get_string("key1")?;
    assert_eq!(r, None);
    db_map.put_string("key1", "value1")?;
    let r = db_map.get_string("key1")?;
    assert_eq!(r, Some("value1".into()));
    db_map.sync_data()?;
    Ok(())
}

Example DbMapDbInt:

use siamesedb::{DbMapDbInt, DbXxx, DbXxxBase, DbXxxObjectSafe};

fn main() -> std::io::Result<()> {
    let db_name = "target/tmp/doc-test2.siamesedb";
    // remove database
    let _ = std::fs::remove_dir_all(db_name);
    // create or open database
    let db = siamesedb::open_file(db_name)?;
    let mut db_map = db.db_map_int("some_list1")?;
    let r = db_map.get_string(&120)?;
    assert_eq!(r, None);
    db_map.put_string(&120, "value120")?;
    let r = db_map.get_string(&120)?;
    assert_eq!(r, Some("value120".to_string()));
    db_map.sync_data()?;
    Ok(())
}

Example Iterator:

use siamesedb::{DbMapDbString, DbMap, DbXxx, DbXxxBase, DbXxxObjectSafe};

fn main() -> std::io::Result<()> {
    let db_name = "target/tmp/doc-test3.siamesedb";
    // remove database
    let _ = std::fs::remove_dir_all(db_name);
    // create or open database
    let db = siamesedb::open_file(db_name)?;
    // create or get db map
    let mut db_map = db.db_map_string("some_map1")?;
    //
    // insert
    db_map.put_string("key01", "value1").unwrap();
    db_map.put_string("key02", "value2").unwrap();
    db_map.put_string("key03", "value3").unwrap();
    //
    // iterator
    let mut iter = db_map.iter();
    assert_eq!(iter.next(), Some(("key01".into(), "value1".into())));
    assert_eq!(iter.next(), Some(("key02".into(), "value2".into())));
    assert_eq!(iter.next(), Some(("key03".into(), "value3".into())));
    assert_eq!(iter.next(), None);
    //
    db_map.sync_data()?;
    Ok(())
}