mongodb shell

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本文介绍了MongoDB中如何使用命令进行数据库操作，包括显示所有数据库、选择数据库、列出集合、查询集合数据、获取帮助、创建索引、查看索引及删除索引等关键步骤。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

show command

show dbs
use <db name>
show collections
db.<collectionName>.find()

list help for collection

db.<collectionName>.help()

create index

> db.test.getIndexes()
[
        {
                "v" : 1,
                "key" : {
                        "_id" : 1
                },
                "name" : "_id_",
                "ns" : "perf_test.test"
        }
]
> db.test.createIndex({"test_name": 1})
{
        "createdCollectionAutomatically" : false,
        "numIndexesBefore" : 1,
        "numIndexesAfter" : 2,
        "ok" : 1
}
> db.test.getIndexes()
[
        {
                "v" : 1,
                "key" : {
                        "_id" : 1
                },
                "name" : "_id_",
                "ns" : "perf_test.test"
        },
        {
                "v" : 1,
                "key" : {
                        "test_name" : 1
                },
                "name" : "test_name_1",
                "ns" : "perf_test.test"
        }
]

drop index

> db.test.dropIndex("test_name")
{
        "nIndexesWas" : 2,
        "ok" : 0,
        "errmsg" : "index not found with name [test_name]"
}
> db.test.getIndexes()
[
        {
                "v" : 1,
                "key" : {
                        "_id" : 1
                },
                "name" : "_id_",
                "ns" : "perf_test.test"
        },
        {
                "v" : 1,
                "key" : {
                        "test_name" : 1
                },
                "name" : "test_name_1",
                "ns" : "perf_test.test"
        }
]
> db.test.dropIndex( {"test_name": 1} )
{ "nIndexesWas" : 2, "ok" : 1 }
> db.test.getIndexes()
[
        {
                "v" : 1,
                "key" : {
                        "_id" : 1
                },
                "name" : "_id_",
                "ns" : "perf_test.test"
        }
]