mongoose 数据库操作3

<code style="border: 0px none; color: rgb(51,51,51)">Model.find(query, fields, options, callback)</code>

<code style="border: 0px none; color: rgb(51,51,51)">Model.find({ ‘some.value‘: 5 }, function (err, docs) {
  // docs is an array
});</code>

Model.findOne

<code style="border: 0px none; color: rgb(51,51,51)">Model.findOne({ age: 5}, function (err, doc){
  // doc is a Document
});</code>

Model.findById

<code style="border: 0px none; color: rgb(51,51,51)">Model.findById(obj._id, function (err, doc){
  // doc is a Document
});</code>

Model.count

<code style="border: 0px none; color: rgb(51,51,51)">Model.count(conditions, callback);</code>

Model.remove

<code style="border: 0px none; color: rgb(51,51,51)">Model.remove(conditions, callback);</code>

Model.distinct

<code style="border: 0px none; color: rgb(51,51,51)">Model.distinct(field, conditions, callback);</code>

Model.where

<code style="border: 0px none; color: rgb(51,51,51)">Model
.where(‘age‘).gte(25)
.where(‘tags‘).in([‘movie‘, ‘music‘, ‘art‘])
.select(‘name‘, ‘age‘, ‘tags‘)
.skip(20)
.limit(10)
.asc(‘age‘)
.slaveOk()
.hint({ age: 1, name: 1 })
.exec(callback);</code>

Model.$where

<code style="border: 0px none; color: rgb(51,51,51)">Model.$where(‘this.firstname === this.lastname‘).exec(callback)</code>

<code style="border: 0px none; color: rgb(51,51,51)">var query = Model.find({});
query.where(‘field‘, 5);
query.limit(5);
query.skip(100);
query.exec(function (err, docs) {
  // called when the `query.complete` or `query.error` are called
  // internally
});</code>

Model.update

<code style="border: 0px none; color: rgb(51,51,51)">var conditions = { name: ‘borne‘ }// 条件
  , update = { $inc: { visits: 1 }}//改动
  , options = { multi: true };//选项 multi 改动多个 
Model.update(conditions, update, options, callback);
function callback (err, numAffected) {
  // numAffected is the number of updated documents
})</code>

<code style="border: 0px none; color: rgb(51,51,51)">Model.findOne({ name: ‘borne‘ }, function (err, doc){//doc 是模型
  doc.name = ‘jason borne‘;
  doc.visits.$inc();
  doc.save();
});</code>

mongoose 数据库操作3

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