66 lines
1.7 KiB
JavaScript
66 lines
1.7 KiB
JavaScript
import Loki from 'lokijs';
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import LokiIndexedAdapter from 'loki/loki-indexed-adapter';
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const DEFAULTS = {
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autosave: false
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};
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var databasable = {
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accessDb: function(db_name, opts){
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var databasable = this;
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opts = Object.assign(Object.assign({
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persistenceMethod: 'adapter',
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persistenceAdapter: new LokiIndexedAdapter(db_name)
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}, DEFAULTS), opts || {});
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return new Promise((fnResolve, fnReject){
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if (!databasable.db) {
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databasable.db = new Loki(db_name, opts);
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databasable.db.loadDatabase({}, ()=>{
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fnResolve(databasable.db);
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});
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} else { fnResolve(databasable.db); }
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});
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},
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closeDb: function(){
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var databasable = this;
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if (databasable.db){
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databasable.db.save();
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databasable.db.close();
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databasable.db = undefined;
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}
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},
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collection: function(collection_name, options){
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var databasable = this;
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return databasable.accessDb()
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.then((db)=>{
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var collection = db.getCollection(collection_name)
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if (!collection){
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collection = db.addCollection(collection_name, options);
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}
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return collection;
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});
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}
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rangeToLokiParams: function(attr, range){
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var date_params = {};
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if (range[0] !== undefined && range[0] !== undefined){
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var start_condition = {},
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end_condition = {};
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date_params['$and'] = [start_condition, end_condition];
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start_condition[attr] = {'$lt': range[1]};
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end_condition[attr] = {'$lt': range[1]};
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} else if (range[0] !== undefined) {
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date_params[attr] = {'$gt': range[0]}
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} else if (range[1] !== undefined) {
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date_params[attr] = {'$lt': range[1]}
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}
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return date_params;
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}
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};
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export default databaseable;
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