下面常用的update操作，用mongodb2.6.3版本測試的，官方發布的穩定版本2.4，建議用穩定版。 一，upsert表示如果有數據就不插入，沒數據就插入 1，命令行下 db.peoples.update( //查找name等于tank的用戶... { name: "tank" },... {... "_id":1,... name: "An

下面常用的update操作，用mongodb2.6.3版本測試的，官方發布的穩定版本2.4，建議用穩定版。

一，upsert表示如果有數據就不插入，沒數據就插入

1，命令行下

> db.peoples.update( //查找name等于tank的用戶

... { name: "tank" },

... {

... "_id":1,

... name: "Andy",

... rating: 10,

... score: 10

... },

... { upsert: true } //如果沒有就插入

... );

WriteResult({ "nMatched" : 0, "nUpserted" : 1, "_id" : 1 })

> db.peoples.find();

{ "_id" : 1, "name" : "Andy", "rating" : 10, "score" : 10 }

> db.peoples.update(

... { _id: 1 },

... {

... "_id":1,

... name: "Andy",

... rating: 10,

... score: 10

... },

... { upsert: true }

... );

WriteResult({ "nMatched" : 1, "nUpserted" : 0 }) //有匹配數據就不做插入操作

> db.peoples.find();

{ "_id" : 1, "name" : "Andy", "rating" : 10, "score" : 10 }

2，php upsert操作

$collection->update(

array("name" => "zhang"),

array("_id"=>2,"name"=>"tank","rating"=>10,"score"=>10),

array("upsert" => true)

);

print_r($collection->findOne());

二，$set 替換值

1，命令行下操作

> db.peoples.find();

{ "_id" : 1, "name" : "Andy", "rating" : 10, "score" : 10 }

> db.peoples.update(

... { _id: 1 },

... {

... $set: { rating: 18 }

... }

... );

WriteResult({ "nMatched" : 1, "nUpserted" : 0 })

> db.peoples.find();

{ "_id" : 1, "name" : "Andy", "rating" : 18, "score" : 10 }

2，php $set操作

$where = array("_id"=>1);

$param = array('$set'=>array("score"=>"100")); //注意此處的set必須為 單引號

$collection->update($where,$param);

print_r($collection->findOne());

三，$inc如果沒有對應對段就直接賦值，如果有在原來的值上加上該值

1，命令行下操作

> db.peoples.find();

{ "_id" : 1, "name" : "Andy", "rating" : 28, "score" : 10 }

> db.peoples.update(

... { _id: 1 },

... {

... $inc: { age: 30 }

... }

... );

WriteResult({ "nMatched" : 1, "nUpserted" : 0 })

> db.peoples.find();

{ "_id" : 1, "age" : 30, "name" : "Andy", "rating" : 28, "score" : 10 } //第一次，加了一個字段

> db.peoples.update(

... { _id: 1 },

... {

... $inc: { age: 30 }

... }

... );

WriteResult({ "nMatched" : 1, "nUpserted" : 0 })

> db.peoples.find();

{ "_id" : 1, "age" : 60, "name" : "Andy", "rating" : 28, "score" : 10 } //第二次，發現有這個字段就把值加上去了

2，php $inc操作

$where = array("_id"=>1);

$param = array('$inc'=>array("age"=>30));

$collection->update($where,$param);

print_r($collection->findOne());

四，$unset刪除字段

1，命令行下操作

> db.peoples.find();

{ "_id" : 1, "age" : 120, "name" : "Andy", "rating" : 28, "score" : 10 }

> db.peoples.update(

... { _id: 1 },

... {

... $unset: { age: ""} //刪除age字段

... }

... );

WriteResult({ "nMatched" : 1, "nUpserted" : 0 })

> db.peoples.find();

{ "_id" : 1, "name" : "Andy", "rating" : 28, "score" : 10 }

>

2，php $unset操作

$where = array("_id"=>1);

$param = array('$unset'=>array("score"=>""));

$collection->update($where,$param);

print_r($collection->findOne());

五，$rename修改字段名稱

1，命令行下操作

> db.peoples.find();

{ "_id" : 1, "name" : "Andy", "rating" : 28 }

> db.peoples.update(

... { _id: 1 },

... { $rename: { "name": "firstname" } } //將name改成firstname

... );

WriteResult({ "nMatched" : 1, "nUpserted" : 0 })

> db.peoples.find();

{ "_id" : 1, "firstname" : "Andy", "rating" : 28 }

2，php $rename 操作

$where = array("_id"=>1);

$param = array('$rename'=>array("firstname"=>"name")); //將firstname改成name

$collection->update($where,$param);

print_r($collection->findOne());

六，multi更新多條數據

1,命令行下操作

> db.peoples.find();

{ "_id" : 1, "name" : "Andy", "rating" : 28 }

{ "_id" : 2, "name" : "zhang", "rating" : 3, "score" : 5 }

{ "_id" : 3, "name" : "hao", "rating" : 30, "score" : 5 }

> db.peoples.update(

... { rating: { $gt: 15 } },

... { $inc: { score: 10 } },

... { multi: true }

... );

WriteResult({ "nMatched" : 2, "nUpserted" : 0 })

> db.peoples.find();

{ "_id" : 1, "name" : "Andy", "rating" : 28, "score" : 10 } //這條數據更新了

{ "_id" : 2, "name" : "zhang", "rating" : 3, "score" : 5 }

{ "_id" : 3, "name" : "hao", "rating" : 30, "score" : 15 } //這條數據更新了

2，php multi操作

$where = array("rating"=>array('$gt'=>10));

$param = array('$set'=>array("name"=>"tank1","rating"=>50));

$ismore = array("multiple" => true);

$collection->update($where,$param,$ismore);

版本不一樣，功能多少會不一樣，例如，我用的版本是2.6.3,$min和$max就用不了，會報"errmsg" : "Invalid modifier specified $min"，希望mongodb出一個穩定高版本。

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