mongoDB基本操作

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数据库

mongodb

1. 插入

j = {name:"mongo"};

t = {x:3};

db.things.save(j);
db.things.save(t);
db.things.find();

结果：

{ "_id" : ObjectId("513b3741d003e00702f229bd"), "name" : "mongo" }
{ "_id" : ObjectId("513b3747d003e00702f229be"), "x" : 3 }

2. for循环

for(var i=1;i<10;i++){db.things.save({x:4,j:i});};
db.things.find();

结果:

{ "_id" : ObjectId("513b3741d003e00702f229bd"), "name" : "mongo" }
{ "_id" : ObjectId("513b3747d003e00702f229be"), "x" : 3 }
{ "_id" : ObjectId("513b38d4d003e00702f229bf"), "x" : 4, "j" : 1 }
{ "_id" : ObjectId("513b38d4d003e00702f229c0"), "x" : 4, "j" : 2 }
{ "_id" : ObjectId("513b38d4d003e00702f229c1"), "x" : 4, "j" : 3 }
{ "_id" : ObjectId("513b38d4d003e00702f229c2"), "x" : 4, "j" : 4 }
{ "_id" : ObjectId("513b38d4d003e00702f229c3"), "x" : 4, "j" : 5 }
{ "_id" : ObjectId("513b38d4d003e00702f229c4"), "x" : 4, "j" : 6 }
{ "_id" : ObjectId("513b38d4d003e00702f229c5"), "x" : 4, "j" : 7 }
{ "_id" : ObjectId("513b38d4d003e00702f229c6"), "x" : 4, "j" : 8 }
{ "_id" : ObjectId("513b38d4d003e00702f229c7"), "x" : 4, "j" : 9 }

var cursor = db.things.find();
while(cursor.hasNext()){printjson(cursor.next());}

结果:

{ "_id" : ObjectId("513b3741d003e00702f229bd"), "name" : "mongo" }
{ "_id" : ObjectId("513b3747d003e00702f229be"), "x" : 3 }
{ "_id" : ObjectId("513b38d4d003e00702f229bf"), "x" : 4, "j" : 1 }
{ "_id" : ObjectId("513b38d4d003e00702f229c0"), "x" : 4, "j" : 2 }
{ "_id" : ObjectId("513b38d4d003e00702f229c1"), "x" : 4, "j" : 3 }
{ "_id" : ObjectId("513b38d4d003e00702f229c2"), "x" : 4, "j" : 4 }
{ "_id" : ObjectId("513b38d4d003e00702f229c3"), "x" : 4, "j" : 5 }
{ "_id" : ObjectId("513b38d4d003e00702f229c4"), "x" : 4, "j" : 6 }
{ "_id" : ObjectId("513b38d4d003e00702f229c5"), "x" : 4, "j" : 7 }
{ "_id" : ObjectId("513b38d4d003e00702f229c6"), "x" : 4, "j" : 8 }
{ "_id" : ObjectId("513b38d4d003e00702f229c7"), "x" : 4, "j" : 9 }

数组形式:

var cursor = db.things.find();
printjson(cursor[3]);

循环条件：

db.things.find({x:4},{j:true}).forEach(printjson);

结果:

{ "_id" : ObjectId("513b38d4d003e00702f229bf"), "j" : 1 }
{ "_id" : ObjectId("513b38d4d003e00702f229c0"), "j" : 2 }
{ "_id" : ObjectId("513b38d4d003e00702f229c1"), "j" : 3 }
{ "_id" : ObjectId("513b38d4d003e00702f229c2"), "j" : 4 }
{ "_id" : ObjectId("513b38d4d003e00702f229c3"), "j" : 5 }
{ "_id" : ObjectId("513b38d4d003e00702f229c4"), "j" : 6 }
{ "_id" : ObjectId("513b38d4d003e00702f229c5"), "j" : 7 }
{ "_id" : ObjectId("513b38d4d003e00702f229c6"), "j" : 8 }
{ "_id" : ObjectId("513b38d4d003e00702f229c7"), "j" : 9 }

limit结果集数量

db.things.find().limit(3);

结果:

{ "_id" : ObjectId("513b3741d003e00702f229bd"), "name" : "mongo" }
{ "_id" : ObjectId("513b3747d003e00702f229be"), "x" : 3 }
{ "_id" : ObjectId("513b38d4d003e00702f229bf"), "x" : 4, "j" : 1 }

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