React Native mongoose (remobile)

A AsyncStorage based mongoose like storage for react-native

Installation

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

Usage

Example

'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 (
            <View style={styles.container}>
                <Button onPress={this.doClear}>清除</Button>
                <Button onPress={this.doShowList}>列表</Button>
                <Button onPress={this.doShowKeys}>键值</Button>
                <Button onPress={this.doInsert}>Insert</Button>
                <Button onPress={this.doFind}>Find</Button>
                <Button onPress={this.doFindOne}>findOne</Button>
                <Button onPress={this.doRemove}>Remove</Button>
                <Button onPress={this.doUpsert}>Upsert</Button>
            </View>
        );
    }
});


var styles = StyleSheet.create({
    container: {
        flex: 1,
        backgroundColor: 'transparent',
        justifyContent: 'space-around',
        paddingVertical: 150,
    },
});

method

• creat dataBase

var db = new Mongoose(dbname);

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

• clear memory

    db.clear();

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

• creat collection

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

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

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

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

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

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

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':

    return val1 > val2;

• '$lt':

    return val1 < val2;

• '$gte':

    return val1 >= val2;

• '$lte':

    return val1 <= val2;

• '$ne':

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

• '$eq':

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

• '$like':

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