連接數據庫
var mongo=require("mongodb");
var host="localhost";
var port=mongo.Connection.DEFAULT_PORT;
var server=new mongo.Server(host,port,{auto_reconnect:true});//創建數據庫所在的服務器服務器
var db=new mongo.Db("node-mongo-examples",server,{safe:true});//創建數據庫對象
db.open(function (err,db) {//連接數據庫
if(err)
throw err;
else{
console.log("成功建立數據庫連接");
db.close();
}
});
db.on("close", function (err,db) {//關閉數據庫
if(err) throw err;
else console.log("成功關閉數據庫.");
});
插入數據:
插入數據后,在控制臺中輸出數據文檔的內容
var mongo=require("mongodb");
var host="localhost";
var port=mongo.Connection.DEFAULT_PORT;
var server=new mongo.Server(host,port,{auto_reconnect:true});//創建數據庫所在的服務器服務器
var db=new mongo.Db("node-mongo-examples",server,{safe:true});//創建數據庫對象
db.open(function (err,db) {//連接數據庫
if(err)
throw err;
else{
db.collection("users", function (err,collection) {
collection.insert({username:"盼盼",firstname:"李"}, function (err,docs) {
console.log(docs);
db.close();
});
});
}
});
db.on("close", function (err,db) {//關閉數據庫
if(err) throw err;
else console.log("成功關閉數據庫.");
});
關閉數據庫db.close([forceClose],[callback]);
forceClose為true時,強制關閉該數據庫,當數據庫關閉后,不可再使用open開啟數據庫.
forceClose為false時,不強制關閉數據庫,當數據庫關閉后,可以再使用open打開.
當foreClose為true時:
var mongo=require("mongodb");
var host="localhost";
var port=mongo.Connection.DEFAULT_PORT;
var server=new mongo.Server(host,port,{auto_reconnect:true});//創建數據庫所在的服務器服務器
var db=new mongo.Db("node-mongo-examples",server,{safe:true});//創建數據庫對象
db.open(function (err,db) {//連接數據庫
if(err)
throw err;
else{
db.collection("users", function (err,collection) {
collection.insert({username:"盼盼",firstname:"李"}, function (err,docs) {
console.log(docs);
db.close(false);
});
});
}
});
db.once("close", function (err,db) {//關閉數據庫
if(err) throw err;
else {
db.open(function (err,db) {
db.collection("users", function (err,collection) {
collection.insert({username:"三",firstname:"張"}, function (err,docs) {
if(err) throw err;
else{
console.log(docs);
db.close(true);
}
})
});
});
}
});
//讀取數據
var mongo=require("mongodb");
var host="localhost";
var port=mongo.Connection.DEFAULT_PORT;
var server=mongo.Server(host,port,{auto_reconnect:true});
var db=new mongo.Db("node-mongo-examples",server,{safe:true});
db.open(function (err,db) {
db.collection("users", function (err,collection) {
if(err) throw err;
else{
collection.find({}).toArray(function(err,docs){
if(err) throw err;
else{
console.log(docs);
db.close();
}
});
}
});
});
//帶查詢條件的搜索
var mongo=require("mongodb");
var host="localhost";
var port=mongo.Connection.DEFAULT_PORT;
var server=mongo.Server(host,port,{auto_reconnect:true});
var db=new mongo.Db("node-mongo-examples",server,{safe:true});
db.open(function (err,db) {
db.collection("users", function (err,collection) {
if(err) throw err;
else{
collection.find({username:{$in:["延思","三"]}}).toArray(function(err,docs){
if(err) throw err;
else{
console.log(docs);
db.close();
}
});
}
});
});
//插入一批數據,并且進行搜索type==food且price字段值小于10
var mongo=require("mongodb");
var host="localhost";
var port=mongo.Connection.DEFAULT_PORT;
var server=mongo.Server(host,port,{auto_reconnect:true});
var db=new mongo.Db("node-mongo-examples",server,{safe:true});
var docs=[
{type:"food",price:11},
{type:"food",price:10},
{type:"food",price:9},
{type:"food",price:8},
{type:"book",price:9}
];
db.open(function (err,db) {
db.collection("goods", function (err,collection) {
if(err) throw err;
else{
collection.insert(docs, function (err,docs) {
if(err) throw err;
else{
collection.find({type:"food",price:{$lt:10}}).toArray(
function(err,docs){
if(err) throw err;
else{
console.log(docs);
db.close();
}
}
);
}
})
}
});
});
查詢中的或的表達:
collection.find({$or:[
{type:"food"},
{price:{$lt:10}}
]})
有關node.js操作mongoDB數據庫的講解，今天就先到這里了，基本上常用的操作都有了示例，復雜些的，小伙伴們自由發揮吧，有機會我們再來繼續講解。
