Nodejs连接12种数据库例子集合

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原文：https://segmentfault.com/a/1190000008753686

Cassandra

Module: cassandra-driver Installation

$ npm?install?cassandra-driver

Example

var cassandra = require('cassandra-driver')
var client = new cassandra.Client({ contactPoints: ['localhost'] })

client.execute('select key from system.local', function (err, result) {
  if (err) throw err
  console.log(result.rows[0])
})

Couchbase

Module: couchnode Installation

$ npm?install?couchbase

Example

var couchbase = require('couchbase')
var bucket = (new couchbase.Cluster('http://localhost:8091')).openBucket('bucketName')

// add a document to a bucket
bucket.insert('document-key', { name: 'Matt', shoeSize: 13 }, function (err, result) {
  if (err) {
    console.log(err)
  } else {
    console.log(result)
  }
})

// get all documents with shoe size 13
var n1ql = 'SELECT d.* FROM `bucketName` d WHERE shoeSize = $1'
var query = N1qlQuery.fromString(n1ql)
bucket.query(query, [13], function (err, result) {
  if (err) {
    console.log(err)
  } else {
    console.log(result)
  }
})

CouchDB

Module: nano Installation

$ npm?install?nano

Example

var nano = require('nano')('http://localhost:5984')
nano.db.create('books')
var books = nano.db.use('books')

// Insert a book document in the books database
books.insert({ name: 'The Art of war' }, null, function (err, body) {
  if (err) {
    console.log(err)
  } else {
    console.log(body)
  }
})

// Get a list of all books
books.list(function (err, body) {
  if (err) {
    console.log(err)
  } else {
    console.log(body.rows)
  }
})

LevelDB

Module: levelup Installation

$ npm?install?level?levelup leveldown

Example

var levelup = require('levelup')
var db = levelup('./mydb')

db.put('name', 'LevelUP', function (err) {
  if (err) return console.log('Ooops!', err)

  db.get('name', function (err, value) {
    if (err) return console.log('Ooops!', err)

    console.log('name=' + value)
  })
})

MySQL

Module: mysql Installation

$ npm?install?mysql

Example

var mysql = require('mysql')
var connection = mysql.createConnection({
  host     : 'localhost',
  user     : 'dbuser',
  password : 's3kreee7',
  database : 'my_db'
});

connection.connect()

connection.query('SELECT 1 + 1 AS solution', function (err, rows, fields) {
  if (err) throw err

  console.log('The solution is: ', rows[0].solution)
})

connection.end()

MongoDB

Module: mongodb Installation

$ npm?install?mongodb

Example

var MongoClient = require('mongodb').MongoClient

MongoClient.connect('mongodb://localhost:27017/animals', function (err, db) {
  if (err) throw err

  db.collection('mammals').find().toArray(function (err, result) {
    if (err) throw err

    console.log(result)
  })
})

If you want an object model driver for MongoDB, look at Mongoose.

Neo4j

Module: apoc Installation

$ npm?install?apoc

Example

var apoc = require('apoc')

apoc.query('match (n) return n').exec().then(
  function (response) {
    console.log(response)
  },
  function (fail) {
    console.log(fail)
  }
)

PostgreSQL

Module: pg-promise Installation

$ npm?install?pg-promise

Example

var pgp = require('pg-promise')(/*options*/)
var db = pgp('postgres://username:password@host:port/database')

db.one('SELECT $1 AS value', 123)
  .then(function (data) {
    console.log('DATA:', data.value)
  })
  .catch(function (error) {
    console.log('ERROR:', error)
  })

Redis

Module: redis Installation

$ npm?install?redis

Example

var client = require('redis').createClient()

client.on('error', function (err) {
  console.log('Error ' + err)
})

client.set('string key', 'string val', redis.print)
client.hset('hash key', 'hashtest 1', 'some value', redis.print)
client.hset(['hash key', 'hashtest 2', 'some other value'], redis.print)

client.hkeys('hash key', function (err, replies) {
  console.log(replies.length + ' replies:')

  replies.forEach(function (reply, i) {
    console.log('    ' + i + ': ' + reply)
  })

  client.quit()
})

SQL Server

Module: tedious Installation

$ npm?install?tedious

Example

var Connection = require('tedious').Connection;
var Request = require('tedious').Request;

var config = {
  userName: 'your_username', // update me
  password: 'your_password', // update me
  server: 'localhost'
}

var connection = new Connection(config);

connection.on('connect', function(err) {
  if (err) {
    console.log(err);
  } else {
    executeStatement();
  }
});

function executeStatement() {
  request = new Request("select 123, 'hello world'", function(err, rowCount) {
    if (err) {
      console.log(err);
    } else {
      console.log(rowCount + ' rows');
    }
    connection.close();
  });

  request.on('row', function(columns) {
    columns.forEach(function(column) {
      if (column.value === null) {
        console.log('NULL');
      } else {
        console.log(column.value);
      }
    });
  });

  connection.execSql(request);
}

SQLite

Module: sqlite3 Installation

$ npm?install?sqlite3

Example

var sqlite3 = require('sqlite3').verbose()
var db = new sqlite3.Database(':memory:')

db.serialize(function () {
  db.run('CREATE TABLE lorem (info TEXT)')
  var stmt = db.prepare('INSERT INTO lorem VALUES (?)')

  for (var i = 0; i < 10; i++) {
    stmt.run('Ipsum ' + i)
  }

  stmt.finalize()

  db.each('SELECT rowid AS id, info FROM lorem', function (err, row) {
    console.log(row.id + ': ' + row.info)
  })
})

db.close()

ElasticSearch

Module: elasticsearch Installation

$ npm?install?elasticsearch

Example

var elasticsearch = require('elasticsearch')
var client = elasticsearch.Client({
  host: 'localhost:9200'
})

client.search({
  index: 'books',
  type: 'book',
  body: {
    query: {
      multi_match: {
        query: 'express js',
        fields: ['title', 'description']
      }
    }
  }
}).then(function (response) {
  var hits = response.hits.hits
}, function (error) {
  console.trace(error.message)
})

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