static-database/index.js

For Create a Demo Database

/*!
 * primitive data javascript object
 */

/**
 * Module exports.
 * @public
 */

module.exports = dataobject;

function dataobject(){}

dataobject.insert = function(schema,row) {
	if(this.dataarr===undefined){
		this.dataarr = [];
	}
	if(this.dataarr[schema]===undefined){
		this.dataarr[schema] = [];
	}
	this.dataarr[schema].push(row);
	return {ack: 'succeed'};
}
dataobject.update = function(schema,idx,row) {
	if(this.dataarr===undefined){
		return {ack: 'data not found'};
	}
	if(this.dataarr[schema]===undefined){
		return {ack: 'schema not found'};
	}
	this.dataarr[schema][idx] = row;
	return {ack: 'succeed'};
}

dataobject.select = function(schema,idx,where) {
	if(this.dataarr===undefined){
		return {ack: 'data not found'};
	}
	if(this.dataarr[schema]===undefined){
		return {ack: 'schema not found'};
	}
	
	selectret = [];
	if(idx===undefined){
		this.dataarr[schema].forEach(function(row, idx){
				selectret.push({idx:idx,row:row});
			});
	} else {
		if(this.dataarr[schema][idx]!==undefined){
			selectret.push({idx:idx,row:this.dataarr[schema][idx]});
		} else {
			return {ack: 'row not found'};
		}
	}
	return selectret;
}

dataobject.delete = function(schema,idx) {
	//return JSON.stringify(this.dataarr);
	if(this.dataarr===undefined){
		return {ack: 'data not found'};
	}
	if(this.dataarr[schema]===undefined){
		return {ack: 'schema not found'};
	}
	
	if(idx===undefined){
		return {ack: 'idx is required'};
	} else {
		if(this.dataarr[schema][idx]!==undefined){
			this.dataarr[schema].splice(idx,1);
			return {ack: 'succeed',debug:this.dataarr[schema]};
		} else {
			return {ack: 'row not found'};
		}
	}
}