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
- > 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
- $collection->update(
- array("name" => "zhang"),
- array("_id"=>2,"name"=>"tank","rating"=>10,"score"=>10),
- array("upsert" => true)
- );
- print_r($collection->findOne());
二，$set 替换值
1，命令行下操作
- > 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
- > 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
- $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
- > 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
- $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
- > 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
- $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
- > 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
- $where = array("rating"=>array(‘$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。
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地址:http://blog.51yip.com/nosql/1638.html
