Database for bcoin (leveldown backend).
const bdb = require('bdb');
const db = bdb.create('/path/to/my.db');
await db.open();
const myPrefix = bdb.key('r');
const myKey = bdb.key('t', ['hash160', 'uint32']);
const bucket = db.bucket(myPrefix.encode());
const batch = bucket.batch();
const hash = Buffer.alloc(20, 0x11);
// Write `foo` to `rt[1111111111111111111111111111111111111111][00000000]`.
batch.put(myKey.encode(hash, 0), Buffer.from('foo'));
await batch.write();
// Iterate:
// From: `rt[0000000000000000000000000000000000000000][00000000]`
// To: `rt[ffffffffffffffffffffff
8000
ffffffffffffffffff][ffffffff]`
const iter = bucket.iterator({
gte: myKey.min(),
lte: myKey.max(),
values: true
});
await iter.each((key, value) => {
// Parse each key.
const [hash, index] = myKey.decode(key);
console.log('Hash: %s', hash);
console.log('Index: %d', index);
console.log('Value: %s', value.toString());
});
// Async Iterator is same, just used with for await syntax.:
// From: `rt[0000000000000000000000000000000000000000][00000000]`
// To: `rt[ffffffffffffffffffffffffffffffffffffffff][ffffffff]`
const asyncIter = bucket.iterator({
gte: myKey.min(),
lte: myKey.max(),
values: true
});
for await (const {key, value} of asyncIter) {
const [hash, index] = myKey.decode(key);
console.log('Hash: %s', hash.toString('hex'));
console.log('Index: %d', index);
console.log('Value: %s', value.toString());
}
await db.close();If you contribute code to this project, you are implicitly allowing your code
to be distributed under the MIT license. You are also implicitly verifying that
all code is your original work. </legalese>
- Copyright (c) 2017, Christopher Jeffrey (MIT License).
Parts of this software are based on leveldown:
- Copyright (c) 2017, Rod Vagg (MIT License).
See LICENSE for more info.