A AsyncStorage based mongoose like storage for react-native
npm install @remobile/react-native-mongoose --save'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,
},
});var db = new Mongoose(dbname);* dbname: the name of database, in AsyncStorage it is a item key
db.clear();* react-native-mongoose use memory chache database, when not use it, use it clear memory;
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
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.
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
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
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
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
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 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);