我是NOSQL数据库的新手，并使用Mongo版本2.4.12。我的集合称为"用户"，我想添加名为"用户邮件"的新字段。您能否让我知道如何从命令行/壳终端进行操作？
> db.user.find({username :"John"}).pretty();
{
"_id" : "ajd233d-u980-4000-92b6-5353e9602502",
"username" : "John",
"password" : "John",
"firstname" :"John",
"lastname" : "Rogers",
"enabled" : true,
"employeeauth" : [
{
"employeeId" : "a2fg190-b50d-14k2-aan0-ebb7298fa2b7",
"authorities" : [
"DEVELOPER", "TESTER", "CONSULTANT"
]
}
],
}
我想添加新的字段"用户邮件"，因此结果表演如下：
> db.user.find({username :"John"}).pretty();
{
"_id" : "ajd233d-u980-4000-92b6-5353e9602502",
"username" : "John",
"password" : "John",
"firstname" :"John",
"lastname" : "Rogers",
"useremail": "john.rogers@test.com",
"enabled" : true,
"employeeauth" : [
{
"employeeId" : "a2fg190-b50d-14k2-aan0-ebb7298fa2b7",
"authorities" : [
"DEVELOPER", "TESTER", "CONSULTANT"
]
}
],
}
在这里您去db.user.update({username:"John"},{$set:{"useremail":"john.rogers@test.com"}})
{username:"John"}是查询， {"useremail":"john.rogers@test.com"}是更新。
如果文档中不存在字段useremail，则将插入。如果已经存在，则将更换该值。
参考