Intro to LevelDB

shama · shama · commit 99124a618a98 · 2015-09-15T08:38:46.000-07:00
diff --git a/intro-to-leveldb/README.md b/intro-to-leveldb/README.md
@@ -0,0 +1,10 @@
+# Intro to LevelDB
+
+> [https://www.youtube.com/watch?v=sR7p_JbEip0](https://www.youtube.com/watch?v=sR7p_JbEip0)
+
+Install [io.js](https://iojs.org/en/index.html) or [node.js](https://nodejs.org/).
+
+Within this folder run the terminal command `npm install` to install the
+`dependencies` and `devDependencies`.
+
+Then run `npm start` to run the app and `http://localhost:9966` to view.
diff --git a/intro-to-leveldb/index.js b/intro-to-leveldb/index.js
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+var levelup = require('levelup')
+var sublevel = require('level-sublevel')
+
+var db = sublevel(levelup('./db', {
+  db: require('leveldown'),
+  valueEncoding: 'json'
+}))
+
+var bearsdb = db.sublevel('bears')
+var regionsdb = db.sublevel('regions')
+
+// regionsdb.put('northamerica', { name: 'North America' }, function (err) {
+//   bearsdb.put('steve', { type: 'grizzly', region: 'northamerica' }, function () {
+//
+//   })
+// })
+
+var bears = []
+var stream = bearsdb.createReadStream()
+stream.on('data', function (bear) {
+  regionsdb.get(bear.value.region, function (err, region) {
+    bear.value.region = region
+    bears.push(bear.value)
+  })
+})
+stream.on('close', function () {
+  console.log(bears)
+})
diff --git a/intro-to-leveldb/package.json b/intro-to-leveldb/package.json
@@ -0,0 +1,25 @@
+{
+  "name": "intro-to-leveldb",
+  "version": "0.1.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "budo index.js",
+    "test": "node test.js"
+  },
+  "browser": {
+    "leveldown": "level-js"
+  },
+  "author": "Kyle Robinson Young <kyle@dontkry.com> (http://dontkry.com)",
+  "license": "MIT",
+  "devDependencies": {
+    "budo": "^4.2.1"
+  },
+  "dependencies": {
+    "level": "^1.3.0",
+    "level-js": "^2.2.2",
+    "level-sublevel": "^6.5.1",
+    "leveldown": "^1.4.1",
+    "levelup": "^1.2.1"
+  }
+}
