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mongodb update 字符操作

时间：2021-07-01 10:21:17 帮助过：5人阅读

分类目录： nosql

标签：$inc, $rename, $set, $unset, mongodb, multi, update, upsert

下面常用的update操作，用mongodb2.6.3版本测试的，官方发布的稳定版本2.4，建议用稳定版。

一，upsert表示如果有数据就不插入，没数据就插入

1，命令行下

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> db.peoples.update( //查找name等于tank的用户
... { name: "tank" },
... {
... "_id":1,
... name: "Andy",
... rating: 10,
... score: 10
... },
... { upsert: true } //如果没有就插入
... );
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 }) //有匹配数据就不做插入操作
> db.peoples.find();
{ "_id" : 1, "name" : "Andy", "rating" : 10, "score" : 10 }

2，php upsert操作

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$collection->update(
array("name" => "zhang"),
array("_id"=>2,"name"=>"tank","rating"=>10,"score"=>10),
array("upsert" => true)
);
print_r($collection->findOne());

二，$set 替换值

1，命令行下操作

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> 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

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$where = array("_id"=>1);
$param = array(‘$set‘=>array("score"=>"100")); //注意此处的set必须为单引号
$collection->update($where,$param);
print_r($collection->findOne());

三，$inc如果没有对应对段就直接赋值，如果有在原来的值上加上该值

1，命令行下操作

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> 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，加了一个字段
> 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，发现有这个字段就把值加上去了

2，php $inc操作

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$where = array("_id"=>1);
$param = array(‘$inc‘=>array("age"=>30));
$collection->update($where,$param);
print_r($collection->findOne());

四，$unset删除字段

1，命令行下操作

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> db.peoples.find();
{ "_id" : 1, "age" : 120, "name" : "Andy", "rating" : 28, "score" : 10 }
> db.peoples.update(
... { _id: 1 },
... {
... $unset: { age: ""} //删除age字段
... }
... );
WriteResult({ "nMatched" : 1, "nUpserted" : 0 })
> db.peoples.find();
{ "_id" : 1, "name" : "Andy", "rating" : 28, "score" : 10 }
>

2，php $unset操作

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$where = array("_id"=>1);
$param = array(‘$unset‘=>array("score"=>""));
$collection->update($where,$param);
print_r($collection->findOne());

五，$rename修改字段名称

1，命令行下操作

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> db.peoples.find();
{ "_id" : 1, "name" : "Andy", "rating" : 28 }
> db.peoples.update(
... { _id: 1 },
... { $rename: { "name": "firstname" } } //将name改成firstname
... );
WriteResult({ "nMatched" : 1, "nUpserted" : 0 })
> db.peoples.find();
{ "_id" : 1, "firstname" : "Andy", "rating" : 28 }

2，php $rename 操作

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$where = array("_id"=>1);
$param = array(‘$rename‘=>array("firstname"=>"name")); //将firstname改成name
$collection->update($where,$param);
print_r($collection->findOne());

六，multi更新多条数据

1,命令行下操作

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> 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 } //这条数据更新了
{ "_id" : 2, "name" : "zhang", "rating" : 3, "score" : 5 }
{ "_id" : 3, "name" : "hao", "rating" : 30, "score" : 15 } //这条数据更新了

2，php multi操作

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$where = array("rating"=>array(‘$gt‘=>10));
$param = array(‘$set‘=>array("name"=>"tank1","rating"=>50));
$ismore = array("multiple" => true);
$collection->update($where,$param,$ismore);

版本不一样，功能多少会不一样，例如，我用的版本是2.6.3,$min和$max就用不了，会报"errmsg" : "Invalid modifier specified $min"，希望mongodb出一个稳定高版本。

转载请注明
作者:海底苍鹰
地址:http://blog.51yip.com/nosql/1638.html

mongodb update 字符操作

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mongodb update 字符 操作

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