Mercurial > lbo > hg > leveldb-rs
view examples/leveldb-tool/src/main.rs @ 399:5679d04a98c9
db_impl/version*: Bring back prev_log_number for LevelDB compatibility
author | Lewin Bormann <lbo@spheniscida.de> |
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date | Tue, 10 Oct 2017 21:15:44 +0200 |
parents | 6615d51b1f99 |
children | e06f8508da0c |
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extern crate leveldb_rs; use leveldb_rs::{DB, LdbIterator, Options}; use std::env::args; use std::iter::FromIterator; fn get(db: &mut DB, k: &str) { match db.get(k.as_bytes()) { Some(v) => println!("{} => {}", k, String::from_utf8(v).unwrap()), None => println!("{} => <not found>", k), } } fn put(db: &mut DB, k: &str, v: &str) { db.put(k.as_bytes(), v.as_bytes()).unwrap(); db.flush().unwrap(); } fn delete(db: &mut DB, k: &str) { db.delete(k.as_bytes()).unwrap(); db.flush().unwrap(); } fn iter(db: &mut DB) { let mut it = db.new_iter().unwrap(); while let Some((k, v)) = it.next() { match (String::from_utf8(k), String::from_utf8(v)) { (Ok(sk), Ok(sv)) => println!("{} => {}", sk, sv), (Err(utf8e), Ok(sv)) => println!("{:?} => {}", utf8e.into_bytes(), sv), (Ok(sk), Err(utf8e)) => println!("{} => {:?}", sk, utf8e.into_bytes()), (Err(utf81), Err(utf82)) => { println!("{:?} => {:?}", utf81.into_bytes(), utf82.into_bytes()) } } } } fn compact(db: &mut DB, from: &str, to: &str) { db.compact_range(from.as_bytes(), to.as_bytes()).unwrap(); } fn main() { let args = Vec::from_iter(args()); if args.len() < 2 { panic!("Usage: {} [get|put|delete|iter|compact] [key|from] [val|to]", args[0]); } let mut opt = Options::default(); opt.reuse_logs = true; let mut db = DB::open("tooldb", opt).unwrap(); match args[1].as_str() { "get" => { if args.len() < 3 { panic!("Usage: {} get key", args[0]); } get(&mut db, &args[2]); } "put" => { if args.len() < 4 { panic!("Usage: {} put key val", args[0]); } put(&mut db, &args[2], &args[3]); } "delete" => { if args.len() < 3 { panic!("Usage: {} delete key", args[0]); } delete(&mut db, &args[2]); } "iter" => iter(&mut db), "compact" => { if args.len() < 4 { panic!("Usage: {} compact from to", args[0]); } compact(&mut db, &args[2], &args[3]); } _ => unimplemented!(), } }