02：MongoDB操作

Posted 2021-02-08 不做大哥好多年

1.1 MongoDB 增加数据

　　1、说明

　　　　　　1. 插入文档: insert 如果插入数据的时候，collection还不存在，自动创建集合
　　　　　　2. insertOne: 插入一条数据
　　　　　　3. insertMany: 接收数组，插入多条文档

#1、插入单条数据
db.student1.insertOne({_id:"stu001","name":"Tom","age":25,grade:{"chinese":80,"math":90,"english":88}})

#2、插入多条数据
db.student1.insertMany([
{_id:"stu002","name":"Mary","age":23,grade:{"chinese":80,"math":90}},
{_id:"stu003","name":"Mike","age":23,grade:{"chinese":81,"math":90,"english":88}}
]);

1.2 MongoDB查询操作

　　1、创建测试数据

db.emp.insert(
[
{_id:7369,ename:‘SMITH‘ ,job:‘CLERK‘    ,mgr:7902,hiredate:‘17-12-80‘,sal:800,comm:0,deptno:20},
{_id:7499,ename:‘ALLEN‘ ,job:‘SALESMAN‘ ,mgr:7698,hiredate:‘20-02-81‘,sal:1600,comm:300 ,deptno:30},
{_id:7521,ename:‘WARD‘  ,job:‘SALESMAN‘ ,mgr:7698,hiredate:‘22-02-81‘,sal:1250,comm:500 ,deptno:30},
{_id:7566,ename:‘JONES‘ ,job:‘MANAGER‘  ,mgr:7839,hiredate:‘02-04-81‘,sal:2975,comm:0,deptno:20},
{_id:7654,ename:‘MARTIN‘,job:‘SALESMAN‘ ,mgr:7698,hiredate:‘28-09-81‘,sal:1250,comm:1400,deptno:30},
{_id:7698,ename:‘BLAKE‘ ,job:‘MANAGER‘  ,mgr:7839,hiredate:‘01-05-81‘,sal:2850,comm:0,deptno:30},
{_id:7782,ename:‘CLARK‘ ,job:‘MANAGER‘  ,mgr:7839,hiredate:‘09-06-81‘,sal:2450,comm:0,deptno:10},
{_id:7788,ename:‘SCOTT‘ ,job:‘ANALYST‘  ,mgr:7566,hiredate:‘19-04-87‘,sal:3000,comm:0,deptno:20},
{_id:7839,ename:‘KING‘  ,job:‘PRESIDENT‘,mgr:0,hiredate:‘17-11-81‘,sal:5000,comm:0,deptno:10},
{_id:7844,ename:‘TURNER‘,job:‘SALESMAN‘ ,mgr:7698,hiredate:‘08-09-81‘,sal:1500,comm:0,deptno:30},
{_id:7876,ename:‘ADAMS‘ ,job:‘CLERK‘    ,mgr:7788,hiredate:‘23-05-87‘,sal:1100,comm:0,deptno:20},
{_id:7900,ename:‘JAMES‘ ,job:‘CLERK‘    ,mgr:7698,hiredate:‘03-12-81‘,sal:950,comm:0,deptno:30},
{_id:7902,ename:‘FORD‘  ,job:‘ANALYST‘  ,mgr:7566,hiredate:‘03-12-81‘,sal:3000,comm:0,deptno:20},
{_id:7934,ename:‘MILLER‘,job:‘CLERK‘    ,mgr:7782,hiredate:‘23-01-82‘,sal:1300,comm:0,deptno:10}
]
);

创建emp表并插入14条数据

　　2、基本查询

#1、查询所有的员工信息
db.emp.find()

#2、查询职位值经理的员工
db.emp.find({"job":"MANAGER"})

#3、操作符：$in和$or
#查询职位是MANAGER或者是CLERK员工信息
db.emp.find({"job":{$in:["MANAGER","CLERK"]}})
db.emp.find({$or:[{"job":"MANAGER"},{"job":"CLERK"}]})

#4、查询10号部门工资大于2000的员工
db.emp.find({"sal":{$gt:2000},"deptno":10})

　　3、查询数组的文档

 

 

 

 

 

 

 

111111111111111111111111