1.启动shell
2.数据库、集合、文档
3.插入和查询
插入:db.users.insert({username:"smith"})
查询:db.users.find()
mongodb的_id字段:
传递查询条件:db.users.find({username:"smith"});
db.users.find({$and:[{_id:ObjectId("5bc6c836efe8a9eb8c20aba4")},{username:"smith"}]})
db.users.find({$or:[{_id:ObjectId("5bc6c836efe8a9eb8c20aba4")},{username:"smith"}]})
4.更新文档
更新操作符:db.users.update({username:"smith"},{$set:{country:"Canada"}})
db.users.update({country:"Canada"},{$set:{usrname:"smith"}})
替换更新:db.users.update({usrname:"smith"},{username:"smith"})
db.users.update({username:"smith"},{$unset:{country:1}})
更新复杂的数据:
db.users.update(
{username:"smith"},
{
$set:{
favorites:{
cities:["Chicago","Cheyenne"],
movies:["Casablanca","For a few Dollara More","The String"]
}
}
})
db.users.update(
{username:"jones"},
{
$set:{
favorites:{
movies:["Casablanca","Rocky"]
}
}
})
db.users.find({"favorites.movies":"Casablanca"})
高级更新:
5.删除数据
清空数据:db.foo.remove()
按条件删除:db.foo.remove({"favoritest.citys":"Cheyenne"})
删除集合附带删除索引:db.foo.drop()
6.shell的其他特性:
db.help()
mongo --help
7.使用索引创建和查询
for(i=0;i<20000;i++){
db.numbers.save({num:i});
}
7.1范围查找:$gt 和 $lt
db.numbers.find({"$and":[{num:{"$gt":1000}},{num:{"$lt":2000}}]})
7.2索引和explain()
分析:db.numbers.find({num:{"$gt":19995}}).explain("executionStats")
创建索引:db.numbers.createIndex({num:1})
8:基本管理
8.1:获取数据库的信息 show dbs
展示所有的集合:show collections
低级别数据库和集合的分析:db.stats() ,db.numbers.stats()
8.2:命令如何执行:
db.runCommand({dastats:1})