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James Halliday
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some leveldb content
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‎leveldb.markdown

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an embedded key/value database
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---
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# embedded vs standalone
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* embedded - in-process library
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* standalone - separate service
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---
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# embedded databases
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* leveldb
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* sqlite
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* berkeleydb
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---
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# standalone databases
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* postgresql
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* mysql
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* mongodb
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* couchdb
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---
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# install
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Since leveldb is a standalone databse,
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you can just install it with npm:
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```
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npm install level
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```
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---
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# and then
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``` js
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var level = require('level');
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var db = level('./whatever.db');
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```
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---
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# level methods
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* `db.get()`
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* `db.put()`
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* `db.del()`
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* `db.batch()`
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* `db.createReadStream()`
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---
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# put
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``` js
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var level = require('level');
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var db = level('./whatever.db');
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db.put('key', 'value', function (err) {
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if (err) console.error(err);
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});
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```
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---
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# get
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``` js
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var level = require('level');
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var db = level('./whatever.db');
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db.get('key', function (err, value) {
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if (err) console.error(err);
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else console.log('value=', value);
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});
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```
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---
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# del
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---
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# batch
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``` js
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```
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---
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# createReadStream
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---
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# thinking lexicographically
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---
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# organizing your keys
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---
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# secondary indexes
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---
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# bytewise
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---
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# subleveldown
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---
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# modularity
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* accountdown
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* subleveldown
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* cookie-auth
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---
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#
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‎leveldb/bytewise.json

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[
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{
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"key": [
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"hackerspace",
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"sudoroom"
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],
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"value": {
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"name": "sudoroom"
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},
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"type": "put"
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},
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{
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"key": [
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"hackerspace",
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"noisebridge"
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],
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"value": {
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"name": "noisebridge"
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},
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"type": "put"
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},
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{
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"key": [
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"hacker",
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"substack"
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],
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"value": {
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"name": "substack",
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"hackerspace": "sudoroom"
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},
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"type": "put"
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},
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{
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"key": [
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"hacker",
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"maxogden"
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],
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"value": {
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"name": "maxogden",
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"hackerspace": "sudoroom"
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},
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"type": "put"
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},
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{
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"key": [
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"hacker",
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"ioerror"
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],
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"value": {
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"name": "ioerror",
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"hackerspace": "noisebridge"
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},
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"type": "put"
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},
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{
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"key": [
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"hacker",
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"mitch"
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],
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"value": {
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"name": "mitch",
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"hackerspace": "noisebridge"
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},
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"type": "put"
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},
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{
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"key": [
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"hacker",
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"wrought"
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],
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"value": {
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"name": "wrought",
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"hackerspace": "sudoroom"
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},
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"type": "put"
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},
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{
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"key": [
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"hacker",
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"mk30"
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],
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"value": {
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"name": "mk30",
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"hackerspace": "sudoroom"
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},
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"type": "put"
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},
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{
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"key": [
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"tool",
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"8d9a83"
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],
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"value": {
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"name": "3d printer",
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"hackerspace": "sudoroom"
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},
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"type": "put"
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},
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{
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"key": [
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"tool",
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"ea7e66"
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],
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"value": {
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"name": "piano",
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"hackerspace": "sudoroom"
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},
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"type": "put"
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},
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{
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"key": [
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"tool",
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"025452"
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],
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"value": {
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"name": "laser cutter",
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"hackerspace": "noisebridge"
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},
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"type": "put"
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},
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{
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"key": [
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"hacker",
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"yardena"
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],
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"value": {
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"name": "yardena",
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"hackerspace": "sudoroom"
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},
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"type": "put"
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},
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{
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"key": [
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"tool",
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"5cc709"
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],
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"value": {
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"name": "3d printer",
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"hackerspace": "noisebridge"
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},
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"type": "put"
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},
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{
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"key": [
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"usage",
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"d06ab1"
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],
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"value": {
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"tool": "8d9a83",
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"minutes": "45",
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"user": "maxogden"
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},
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"type": "put"
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},
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{
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"key": [
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"usage",
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"2454c1"
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],
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"value": {
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"tool": "8d9a83",
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"minutes": "20",
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"user": "yardena"
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},
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"type": "put"
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},
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{
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"key": [
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"usage",
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"ec08ed"
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],
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"value": {
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"tool": "ea7e66",
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"minutes": "14",
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"user": "substack"
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},
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"type": "put"
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},
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{
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"key": [
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"usage",
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"61baab"
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],
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"value": {
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"tool": "025452",
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"minutes": "8",
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"user": "mitch"
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},
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"type": "put"
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}
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]

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