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[数据库]MongoDB快速入门学习笔记5 MongoDB的文档修改操作


db.集合名称.update({query},{update},upsert, multi})
query:过滤条件
update:修改内容
upsert:如果不存在查询条件查出的记录,是否插入一条数据,默认是false
multi:是否只修改查询条件查出的第一条记录,默认是false

> db.student.update({_id:1}, {name:"zhang"})WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })> db.student.find(){ "_id" : 1, "name" : "zhang" }{ "_id" : 2, "name" : "lisi", "age" : 27 }{ "_id" : 3, "name" : "wangwu", "age" : 30 }{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }{ "_id" : 5, "name" : "qianliu", "age" : 33 }{ "_id" : 6, "name" : "sunba", "age" : 32 }

把整条数据都修改了,如果修改内容中没有设置age字段,则以前的age也取消了,数据全部修改

 

局部修改
$set:如果存在键则修改,如果不存在键则添加

> db.student.update({_id: 1},{$set:{name:"zhangsan", age: 26}})WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })> db.student.find(){ "_id" : 1, "name" : "zhangsan", "age" : 26 }{ "_id" : 2, "name" : "lisi", "age" : 27 }{ "_id" : 3, "name" : "wangwu", "age" : 30 }{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }{ "_id" : 5, "name" : "qianliu", "age" : 33 }{ "_id" : 6, "name" : "sunba", "age" : 32 }

 

id重复时无法修改

> db.student.update({_id:1},{_id:0, name:"zhangsanzhangsan"})WriteResult({"nMatched" : 0,"nUpserted" : 0,"nModified" : 0,"writeError" : {"code" : 16837,"errmsg" : "The _id field cannot be changed from {_id: 1.0} to {_id: 0.0}."}})> db.student.find(){ "_id" : 1, "name" : "zhangsan", "age" : 26 }{ "_id" : 2, "name" : "lisi", "age" : 27 }{ "_id" : 3, "name" : "wangwu", "age" : 30 }{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }{ "_id" : 5, "name" : "qianliu", "age" : 33 }{ "_id" : 6, "name" : "sunba", "age" : 32 }

 


第三个参数默认为false,如果查不到数据false时不执行任何操作,true时往数据库里新插入一条数据

> db.student.update({_id:7},{_id:7, name: "songjiu", age:32})WriteResult({ "nMatched" : 0, "nUpserted" : 0, "nModified" : 0 })> db.student.update({_id:7},{_id:7, name: "songjiu"}, true)WriteResult({ "nMatched" : 0, "nUpserted" : 1, "nModified" : 0, "_id" : 7 })> db.student.find(){ "_id" : 1, "name" : "zhangsan", "age" : 26 }{ "_id" : 2, "name" : "lisi", "age" : 27 }{ "_id" : 3, "name" : "wangwu", "age" : 30 }{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }{ "_id" : 5, "name" : "qianliu", "age" : 33 }{ "_id" : 6, "name" : "sunba", "age" : 32 }{ "_id" : 7, "name" : "songjiu", "age" : 32 }

 


第四个参数默认为false,false时表示只修改查询到的第一条数据,true时表示修改查询到的所有数据

> db.student.update({age:32}, {$set:{age:33}}, false, false)WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })> db.student.find(){ "_id" : 1, "name" : "zhangsan", "age" : 26 }{ "_id" : 2, "name" : "lisi", "age" : 27 }{ "_id" : 3, "name" : "wangwu", "age" : 30 }{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }{ "_id" : 5, "name" : "qianliu", "age" : 33 }{ "_id" : 6, "name" : "sunba", "age" : 33 }{ "_id" : 7, "name" : "songjiu", "age" : 32 }> db.student.update({age:33}, {$set:{age:32}}, false, true)WriteResult({ "nMatched" : 2, "nUpserted" : 0, "nModified" : 2 })> db.student.find(){ "_id" : 1, "name" : "zhangsan", "age" : 26 }{ "_id" : 2, "name" : "lisi", "age" : 27 }{ "_id" : 3, "name" : "wangwu", "age" : 30 }{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }{ "_id" : 5, "name" : "qianliu", "age" : 32 }{ "_id" : 6, "name" : "sunba", "age" : 32 }{ "_id" : 7, "name" : "songjiu", "age" : 32 }> db.student.update({age:32}, {$set:{age:33}})WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })> db.student.find(){ "_id" : 1, "name" : "zhangsan", "age" : 26 }{ "_id" : 2, "name" : "lisi", "age" : 27 }{ "_id" : 3, "name" : "wangwu", "age" : 30 }{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }{ "_id" : 5, "name" : "qianliu", "age" : 33 }{ "_id" : 6, "name" : "sunba", "age" : 32 }{ "_id" : 7, "name" : "songjiu", "age" : 32 }

 


$inc:在原来的基础上加多少

> db.student.update({_id:7}, {$inc:{age:-1}})WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })> db.student.find(){ "_id" : 1, "name" : "zhangsan", "age" : 26 }{ "_id" : 2, "name" : "lisi", "age" : 27 }{ "_id" : 3, "name" : "wangwu", "age" : 30 }{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }{ "_id" : 5, "name" : "qianliu", "age" : 33 }{ "_id" : 6, "name" : "sunba", "age" : 32 }{ "_id" : 7, "name" : "songjiu", "age" : 31 }

 

$unset:去掉某个键

> db.student.update({_id:7},{$unset:{age:1}})WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })> db.student.find(){ "_id" : 1, "name" : "zhangsan", "age" : 26 }{ "_id" : 2, "name" : "lisi", "age" : 27 }{ "_id" : 3, "name" : "wangwu", "age" : 30 }{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }{ "_id" : 5, "name" : "qianliu", "age" : 33 }{ "_id" : 6, "name" : "sunba", "age" : 32 }{ "_id" : 7, "name" : "songjiu" }

 

 

针对数组类型的操作

$push:当数据中不存在键时,创建数组类型的键并插入该值;如果存在该键,并且该键是数组类型时,则在此数组类型的数据上追加;如果存在该键,并且该键不是数组类型时,会报错。
$pushAll:批量往数组中追加
$addToSet:数组中有该值时不追加,没有该值时追加

> db.student.update({_id: 7},{$push:{skill:"java"}})WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })> db.student.find(){ "_id" : 1, "name" : "zhangsan", "age" : 26 }{ "_id" : 2, "name" : "lisi", "age" : 27 }{ "_id" : 3, "name" : "wangwu", "age" : 30 }{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }{ "_id" : 5, "name" : "qianliu", "age" : 33 }{ "_id" : 6, "name" : "sunba", "age" : 32 }{ "_id" : 7, "name" : "songjiu", "skill" : [ "java" ] }> db.student.update({_id: 7},{$push:{skill:"mongodb"}})WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })> db.student.find(){ "_id" : 1, "name" : "zhangsan", "age" : 26 }{ "_id" : 2, "name" : "lisi", "age" : 27 }{ "_id" : 3, "name" : "wangwu", "age" : 30 }{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }{ "_id" : 5, "name" : "qianliu", "age" : 33 }{ "_id" : 6, "name" : "sunba", "age" : 32 }{ "_id" : 7, "name" : "songjiu", "skill" : [ "java", "mongodb" ] }> db.student.update({_id: 7},{$push:{name:"111"}})WriteResult({"nMatched" : 0,"nUpserted" : 0,"nModified" : 0,"writeError" : {"code" : 16837,"errmsg" : "The field 'name' must be an array but is of type String in document {_id: 7.0}"}})> db.student.update({_id: 7},{$pushAll:{skill:["js","C++","java"]}})WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })> db.student.find(){ "_id" : 1, "name" : "zhangsan", "age" : 26 }{ "_id" : 2, "name" : "lisi", "age" : 27 }{ "_id" : 3, "name" : "wangwu", "age" : 30 }{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }{ "_id" : 5, "name" : "qianliu", "age" : 33 }{ "_id" : 6, "name" : "sunba", "age" : 32 }{ "_id" : 7, "name" : "songjiu", "skill" : [ "java", "mongodb", "js", "C++", "java" ] }> db.student.update({_id:7},{$addToSet:{skill:"mongodb"}})WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 0 })> db.student.find(){ "_id" : 1, "name" : "zhangsan", "age" : 26 }{ "_id" : 2, "name" : "lisi", "age" : 27 }{ "_id" : 3, "name" : "wangwu", "age" : 30 }{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }{ "_id" : 5, "name" : "qianliu", "age" : 33 }{ "_id" : 6, "name" : "sunba", "age" : 32 }{ "_id" : 7, "name" : "songjiu", "skill" : [ "java", "mongodb", "js", "C++", "java" ] }

 


$pop:删除数组的第一个或最后一个元素,值为-1时是删除第一个元素,值为1时是删除最后一个元素。
$pull:删除数组中的某一个指定的数值
$pullAll:删除数组中多个指定的数值

> db.student.update({_id:7},{$pop:{skill:1}})WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })> db.student.find(){ "_id" : 1, "name" : "zhangsan", "age" : 26 }{ "_id" : 2, "name" : "lisi", "age" : 27 }{ "_id" : 3, "name" : "wangwu", "age" : 30 }{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }{ "_id" : 5, "name" : "qianliu", "age" : 33 }{ "_id" : 6, "name" : "sunba", "age" : 32 }{ "_id" : 7, "name" : "songjiu", "skill" : [ "java", "mongodb", "js", "C++" ] }> db.student.update({_id:7},{$pop:{skill:-1}})WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })> db.student.find(){ "_id" : 1, "name" : "zhangsan", "age" : 26 }{ "_id" : 2, "name" : "lisi", "age" : 27 }{ "_id" : 3, "name" : "wangwu", "age" : 30 }{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }{ "_id" : 5, "name" : "qianliu", "age" : 33 }{ "_id" : 6, "name" : "sunba", "age" : 32 }{ "_id" : 7, "name" : "songjiu", "skill" : [ "mongodb", "js", "C++" ] }> db.student.update({_id:7},{$pull:{skill:"js"}})WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })> db.student.find(){ "_id" : 1, "name" : "zhangsan", "age" : 26 }{ "_id" : 2, "name" : "lisi", "age" : 27 }{ "_id" : 3, "name" : "wangwu", "age" : 30 }{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }{ "_id" : 5, "name" : "qianliu", "age" : 33 }{ "_id" : 6, "name" : "sunba", "age" : 32 }{ "_id" : 7, "name" : "songjiu", "skill" : [ "mongodb", "C++" ] }> db.student.update({_id:7},{$pullAll:{skill:["js"]}})WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 0 })> db.student.find(){ "_id" : 1, "name" : "zhangsan", "age" : 26 }{ "_id" : 2, "name" : "lisi", "age" : 27 }{ "_id" : 3, "name" : "wangwu", "age" : 30 }{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }{ "_id" : 5, "name" : "qianliu", "age" : 33 }{ "_id" : 6, "name" : "sunba", "age" : 32 }{ "_id" : 7, "name" : "songjiu", "skill" : [ "mongodb", "C++" ] }> db.student.update({_id:7},{$pullAll:{skill:["mongodb","C++"]}})WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })> db.student.find(){ "_id" : 1, "name" : "zhangsan", "age" : 26 }{ "_id" : 2, "name" : "lisi", "age" : 27 }{ "_id" : 3, "name" : "wangwu", "age" : 30 }{ "_id" : 4, "name" : "zhaoliu", "age" : 28 }{ "_id" : 5, "name" : "qianliu", "age" : 33 }{ "_id" : 6, "name" : "sunba", "age" : 32 }{ "_id" : 7, "name" : "songjiu", "skill" : [ ] }