|
" : "zhongguo", "province" : "bj", "userid" : "da" }
{ "_id" : ObjectId("5c94f39925000fc9936a975d"), "country" : "zhongguo", "province" : "bj", "userid" : "fa" }
> db.userinfo.update({country:"zhongguo"},{set:{country:"zh_CN"}},{multi:true}) # multi的值为true,但是set前没有加"$",所以此次更新操作没有更新数据
WriteResult({
"nMatched" : 0,
"nUpserted" : 0,
"nModified" : 0,
"writeError" : {
"code" : 9,
"errmsg" : "multi update only works with $ operators"
}
})
> db.userinfo.update({country:"zhongguo"},{$set:{country:"zh_CN"}},{multi:true}) # multi的值为true,set前加了"$",所以把所有文档的country字段更新为"zh_CN"
WriteResult({ "nMatched" : 4, "nUpserted" : 0, "nModified" : 4 })
> db.userinfo.find()
{ "_id" : ObjectId("5c94f37d25000fc9936a9759"), "set" : { "country" : "zhongguo" } }
{ "_id" : ObjectId("5c94f38425000fc9936a975a"), "country" : "zh_CN", "province" : "sh", "userid" : "b" }
{ "_id" : ObjectId("5c94f38625000fc9936a975b"), "country" : "zh_CN", "province" : "sh", "userid" : "c" }
{ "_id" : ObjectId("5c94f39325000fc9936a975c"), "country" : "zh_CN", "province" : "bj", "userid" : "da" }
{ "_id" : ObjectId("5c94f39925000fc9936a975d"), "country" : "zh_CN", "province" : "bj", "userid" : "fa" }
5.删除文档
语法：
db.集合名称.remove(<query>,{justOne: <boolean>})
参数说明：
query:可选，删除?档的条件
justOne:可选， 如果设为true或1， 则只删除?条， 默认false， 表示删除多条
例子:
> db.test_table01.find()
{ "_id" : ObjectId("5c939a4f4c9ce97c5b78a0da"), "name" : "xiaoqiang", "age" : 10 }
{ "_id" : ObjectId("5c939adc4c9ce97c5b78a0db"), "name" : "xiaozhao", "age" : 20 }
{ "_id" : 1000001, "name" : "xiaobei" }
{ "_id" : ObjectId("5c939dd14c9ce97c5b78a0dc"), "name" : "xiaoqiang", "age" : 20 }
{ "_id" : ObjectId("5c939dd44c9ce97c5b78a0dd"), "name" : "xiaoqiang", "age" : 30 }
{ "_id" : ObjectId("5c939dd74c9ce97c5b78a0de"), "name" : "xiaoqiang", "age" : 40 }
> db.test_table01.remove({name:"xiaobei"}) # 删除所有name为xiaobei的数据
WriteResult({ "nRemoved" : 1 })
> db.test_table01.find()
{ "_id" : ObjectId("5c939a4f4c9ce97c5b78a0da"), "name" : "xiaoqiang", "age" : 10 }
{ "_id" : ObjectId("5c939adc4c9ce97c5b78a0db"), "name" : "xiaozhao", "age" : 20 }
{ "_id" : ObjectId("5c939dd
|