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https://github.com/remobile/react-native-mongoose


https://github.com/remobile/react-native-mongoose

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# React Native mongoose (remobile)

A AsyncStorage based mongoose like storage for react-native



## Installation

```sh

npm install @remobile/react-native-mongoose --save

```



## Usage



### Example

```js

'use strict';



var React = require('react');

var ReactNative = require('react-native');

var {

    StyleSheet,

    View,

    Image

} = ReactNative;

var {

    StyleSheet,

    View,

    AsyncStorage,

} = ReactNative;



var Button = require('@remobile/react-native-simple-button');

var Mongoose = require('react-native-mongoose');



const DB_NAME = "fang";

const CLT_NAME = "number";

module.exports = React.createClass({

    componentDidMount() {

        this.db = new Mongoose(DB_NAME);

        this.collection = this.db.collection(CLT_NAME, {max:30, unique:['a']});

    },

    doClear() {

        AsyncStorage.removeItem(DB_NAME);

    },

    doShowList() {

        (async function(){

            var list =  await AsyncStorage.getItem(DB_NAME);

            console.log('result:', JSON.parse(list));



        })();

    },

    doShowKeys() {

        (async function(){

            var list = await AsyncStorage.getAllKeys();

            console.log('result:', list);

        })();

    },

    async doInsert() {

        var info = {

            a : 4,

            b : 3,

        };

        var collection = this.collection;

        var list = await collection.insert(info).catch(error=>console.log(error));;

        console.log("list");

        console.log(list);

    },

    async doFind() {

        var collection = this.collection;

        var req = await collection.find();

        console.log(req);

    },

    async doFindOne() {

        var collection = this.collection;

        var req = await collection.findOne({b:3,a:1});

        console.log(req);

    },

    async doRemove() {

        var collection = this.collection;

        var req = await collection.remove();

        console.log(req);

        var req = await collection.find();

        console.log(req);

    },

    async doUpsert() {

        var collection = this.collection;

        var info = {

            a : 4,

            b : 6,

        };

        var list = await collection.upsert(info, {a:4}).catch(error=>console.log(error));;

        console.log("list");

        console.log(list);

    },

    render() {

        return (

            

                清除

                列表

                键值

                Insert

                Find

                findOne

                Remove

                Upsert

            

        );

    }

});



var styles = StyleSheet.create({

    container: {

        flex: 1,

        backgroundColor: 'transparent',

        justifyContent: 'space-around',

        paddingVertical: 150,

    },

});

```



### method

* #### creat dataBase

```js

var db = new Mongoose(dbname);

```

    * dbname: the name of database, in AsyncStorage it is a item key



* #### clear memory

```js

    db.clear();

```

    * react-native-mongoose use memory chache database, when not use it, use it clear memory;



* #### creat collection

```js

var collection = this.db.collection(collectionName, capped);

```

    * collectionName: the name of collection

    * capped: {max: Number, unique:String|Array}

        * max: max rows in collection, if not set, have no limit

        * unique: set unique primary key, it can be a single String or a array for keys



* #### insert

```js

var doc = collection.insert(docs);

```

    * docs: to be insert docs, if set capped.max, when reach capped.max, will be replace oldest one, if set capped.unique, e.g: capped.unique is 'a', then a is unique.



* #### upsert

```js

var doc = collection.upsert(docs, query, params);

```

    * docs: need insert or update data

    * query: look Query help

    * params: {limit:Number, offset:Number, strict:bool};

        * limit: need upsert number

        * offset: need upsert start position

        * strict: set compare strict mode, look Query help



* #### update

```js

var doc = collection.upsert(docs, query, params);

```

    * docs: need update data

    * query: look Query help

    * params: {limit:Number, offset:Number, strict:bool};

        * limit: need update number

        * offset: need update start position

        * strict: set compare strict mode, look Query help



* #### remove

```js

var doc = collection.remove(query, params);

```

    * query: look Query help

    * params: {limit:Number, offset:Number, strict:bool};

        * limit: need remove number

        * offset: need remove start position

        * strict: set compare strict mode, look Query help



* #### find

```js

var docs = collection.find(query, params);

```

    * query: look Query help

    * params: {limit:Number, offset:Number, strict:bool};

        * limit: need find number

        * offset: need find start position

        * strict: set compare strict mode, look Query help



* #### findOne

```js

var doc = collection.findOne(query);

```

    * query: look Query help

    * params: {limit:Number, offset:Number, strict:bool};

        * limit: 1

        * offset: need findOne start position

        * strict: set compare strict mode, look Query help



 ### Query help

Query can be a object like {a:1, b:2}, or {a:{$eq:1}, b:{$eq:2}}

also can be a function lick {a:function(a){return a>1}}

operand like follows:

* '$gt':

```js

    return val1 > val2;

```

* '$lt':

```js

    return val1 < val2;

```

* '$gte':

```js

    return val1 >= val2;

```

* '$lte':

```js

    return val1 <= val2;

```

* '$ne':

```js

    return strict ? val1!==val2 : val1!=val2;

```

* '$eq':

```js

    return strict ? val1===val2 : val1==val2;

```

* '$like':

```js

    return new RegExp(val2).test(val1);

```