1.插入操作user = {"username":"lcq","sex":"man"}db.user.insert(user)2.更新var lcq = db.user.findOne({"username":"lcq"}}lcq.address = {"province":"shandong","location":"zoupin"}lcq.haha = "hehhehe"db.user.update({"username":"lcq"},lcq)> db.user.update({"username":"lcq"},{$set:{"test":"test"}})> db.user.findOne({"username":"lcq"}){"_id" : ObjectId("55024de2849b70a4f670f413"),"address" : {"province" : "shandong","location" : "zoupin"},"haha" : "afdfdfd","sex" : "man","test" : "test","username" : "lcq"}> db.user.update({"username":"lcq"},{$unset:{"test":1}})$unset删除某个字段> lcq = db.user.findOne({"username":"lcq"}){"_id" : ObjectId("55024de2849b70a4f670f413"),"address" : {"province" : "shandong","location" : "zoupin"},"haha" : "afdfdfd","sex" : "man","username" : "lcq"}>>> lcq.count = 1> db.user.update({"username":"lcq"},lcq)> db.user.update({"username":"lcq"},{$inc:{"count":2}})$inc设置某个字段自增> db.user.update({"username":"lcq"},{$set:{"friends":['zhangsan']}})> db.user.findOne(){"_id" : ObjectId("55024de2849b70a4f670f413"),"address" : {"province" : "shandong","location" : "zoupin"},"count" : 3,"friends" : ["zhangsan"],"haha" : "afdfdfd","sex" : "man","username" : "lcq"}> db.user.update({"username":"lcq"},{$push:{"friends":'lisi'}})>> db.user.findOne(){"_id" : ObjectId("55024de2849b70a4f670f413"),"address" : {"province" : "shandong","location" : "zoupin"},"count" : 3,"friends" : ["zhangsan","lisi"],"haha" : "afdfdfd","sex" : "man","username" : "lcq"}$push向数组中添加新的值> db.user.update({"username":"lcq"},{$addToSet:{"friends":'lisi'}})>> db.user.findOne(){"_id" : ObjectId("55024de2849b70a4f670f413"),"address" : {"province" : "shandong","location" : "zoupin"},"count" : 3,"friends" : ["zhangsan","lisi"],"haha" : "afdfdfd","sex" : "man","username" : "lcq"}> db.user.update({"username":"lcq"},{$addToSet:{"friends":'xiaoming'}})>>> db.user.findOne(){"_id" : ObjectId("55024de2849b70a4f670f413"),"address" : {"province" : "shandong","location" : "zoupin"},"count" : 3,"friends" : ["zhangsan","lisi","xiaoming"],"haha" : "afdfdfd","sex" : "man","username" : "lcq"}>可见使用$addToSet添加时，如果存在相同的值则不添加。> db.user.update({"friends":"lisi"},{$set:{"friends.$":"join"}})>>>> db.user.findOne(){"_id" : ObjectId("55024de2849b70a4f670f413"),"address" : {"province" : "shandong","location" : "zoupin"},"count" : 3,"friends" : ["zhangsan","join","xiaoming"],"haha" : "afdfdfd","sex" : "man","username" : "lcq"}使用$符进行数组的定位，实现更新数组特定位置的值。> lcq = db.user.findOne(){"_id" : ObjectId("55024de2849b70a4f670f413"),"address" : {"province" : "shandong","location" : "zoupin"},"count" : 3,"friends" : ["zhangsan","join","xiaoming"],"haha" : "afdfdfd","sex" : "man","username" : "lcq"}>>> lcq.count = 1010>> db.user.save(lcq)>> db.user.findOne(){"_id" : ObjectId("55024de2849b70a4f670f413"),"address" : {"province" : "shandong","location" : "zoupin"},"count" : 10,"friends" : ["zhangsan","join","xiaoming"],"haha" : "afdfdfd","sex" : "man","username" : "lcq"}save方法在不存在时创建，，存在时更新。更加方便。3.删除> db.user.insert({"username":"zhangsan"})> db.user.remove({"username":"zhangsan"})
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