Mongodb Study Notes 2 (simple addition, deletion, query, modification)-PHP source code

Mongodb Study Notes 2 (simple addition, deletion, query, and modification) 1. add a piece of data. I also practiced it yesterday, and today it is further consolidated. There are two main methods: save and insert. Example: db. blog. save ({"name": "taotao", "address": {"city": "beijing", "post": "100096"}, "phone ": "64645646"}) or db. blog. insert ({"name": "taotao", "address": {"city": "beijing", "post": "100096"}, "phone ": "15210340214 "})). In addition, you can assign values to a variable and insert the variable. For example
Post = {
... "Name": "taotao ",
... "Address ":{
... "City": "beijing ",
... "Post": "100096"
...},
... "Phone": "15210340214"
...}
Db. blog. insert (post );
2. delete a record db. set name. remove (condition); for example, db. blog. remove ({"name": "fe-"}) deletes the data whose name is
Deleting all records db. set name. remove (); deleting all records without any conditions is equivalent to deleting all data. For example, db. blog. remove ();
3. query all records db. set name. find (); for example, db. blog. find (); search all data in the collection lblog
Query all records of db. set name. findOne (condition), such as db. blog. findOne ({"name": "fe-"}), and query the data whose name is
This is a simple query. we will learn about various condition queries tomorrow.
4. modify record db. set name. update (condition); db. blog. update ({"name": "fe-" },{" name ":" taotao "}) it is reasonable to say that the conditions are not written and should be completely modified, however, the actual result is modified only by one.