【MongoDB学习笔记7】深入MongoDB的删除（remove/drop）操作

先看集合post中文档信息：

> db.post.find();    { "_id" : ObjectId("54a51cfd7f46906f81b7adcd"), "bar" : "baz" }    { "_id" : 0 }    { "_id" : 1 }    { "_id" : 2 }    { "_id" : 5, "test1" : 0 }    { "_id" : 4, "test2" : 2 }    { "_id" : 3, "test3" : 3 }    { "_id" : 6, "test5" : 5 }    { "_id" : 7, "test1" : 1 }    { "_id" : 8, "test1" : 1 }

删除指定的文档：

> db.post.remove({"_id":5});    WriteResult({ "nRemoved" : 1 })    > db.post.find();    { "_id" : ObjectId("54a51cfd7f46906f81b7adcd"), "bar" : "baz" }    { "_id" : 0 }    { "_id" : 1 }    { "_id" : 2 }    { "_id" : 4, "test2" : 2 }    { "_id" : 3, "test3" : 3 }    { "_id" : 6, "test5" : 5 }    { "_id" : 7, "test1" : 1 }    { "_id" : 8, "test1" : 1 }

删除所有｛"test1"：1｝的文档：

> db.post.remove({"test1":1});    WriteResult({ "nRemoved" : 2 })    > db.post.find();    { "_id" : ObjectId("54a51cfd7f46906f81b7adcd"), "bar" : "baz" }    { "_id" : 0 }    { "_id" : 1 }    { "_id" : 2 }    { "_id" : 4, "test2" : 2 }    { "_id" : 3, "test3" : 3 }    { "_id" : 6, "test5" : 5 }    >

删除整个post集合：

> db.post.drop()    true    > show collections    system.indexes    >