DZone
Thanks for visiting DZone today,
Edit Profile
  • Manage Email Subscriptions
  • How to Post to DZone
  • Article Submission Guidelines
Sign Out View Profile
  • Post an Article
  • Manage My Drafts
Over 2 million developers have joined DZone.
Log In / Join
Refcards Trend Reports Events Over 2 million developers have joined DZone. Join Today! Thanks for visiting DZone today,
Edit Profile Manage Email Subscriptions Moderation Admin Console How to Post to DZone Article Submission Guidelines
View Profile
Sign Out
Refcards
Trend Reports
Events
Zones
Culture and Methodologies Agile Career Development Methodologies Team Management
Data Engineering AI/ML Big Data Data Databases IoT
Software Design and Architecture Cloud Architecture Containers Integration Microservices Performance Security
Coding Frameworks Java JavaScript Languages Tools
Testing, Deployment, and Maintenance Deployment DevOps and CI/CD Maintenance Monitoring and Observability Testing, Tools, and Frameworks
Culture and Methodologies
Agile Career Development Methodologies Team Management
Data Engineering
AI/ML Big Data Data Databases IoT
Software Design and Architecture
Cloud Architecture Containers Integration Microservices Performance Security
Coding
Frameworks Java JavaScript Languages Tools
Testing, Deployment, and Maintenance
Deployment DevOps and CI/CD Maintenance Monitoring and Observability Testing, Tools, and Frameworks
  1. DZone
  2. Coding
  3. Languages
  4. simdb: A Simple JSON DB in GO

simdb: A Simple JSON DB in GO

Go is an increasingly popular language. Follow along as one developer walks us through his attempts at learning this up-and-coming language.

Sony Arouje user avatar by
Sony Arouje
·
Aug. 08, 18 · Tutorial
Like (1)
Save
Tweet
Share
13.69K Views

Join the DZone community and get the full member experience.

Join For Free

Some days ago I decided to learn Go. Go is pretty easy to learn and and an experienced dev could learn its syntax and semantics in a couple of hours. To completely learn a language, I normally write a small app in that language. So, in my free time, I rewrote the expense service I created in Node.js using Go. This whole exercise allowed me to learn Go in detail.

For me, Go looks to be a great, yet simple language with static type checking. It seems like I will be using Go for my future RPi projects rather than Nodejs. In RPi, I often use a simple JSON file as a DB to store, retrieve, and update execution rules, sensor details, etc. In Node.js I use tingodb, but I couldn't find something similar in Go, so I decided to write one, and is called simdb, a simple JSON DB.

Using simdb, I can persist stuct or retrieve or update or delete them from the JSON DB. The DB file created by simdb is a simple JSON file. Let's see some of the functions in simdb.

Create a new instance of the DB: 

driver, err:=db.New("customer")

Insert a new customer to the DB: 

 customer:=Customer {
        CustID:"CUST1",
        Name:"sarouje",
        Address: "address",
        Contact: Contact {
            Phone:"45533355",
            Email:"someone@gmail.com",
        },
    }

    err=driver.Insert(customer)
    if(err!=nil){
        panic(err)
    }

Get a customer:

   err=driver.Open(Customer{}).Where("custid","=","CUST1").First().AsEntity(&customerFirst)
    if(err!=nil){
        panic(err)
    }

Update a customer:

customerFirst.Name="Sony Arouje"
err=driver.Update(customerFirst)
if(err!=nil){
    panic(err)
}

Delete a customer: 

toDel:=Customer{
        CustID:"CUST1",
    }
    err=driver.Delete(toDel)
    if(err!=nil){
        panic(err)
    }

The Update and Delete operations use the ID field of the struct to perform their operations.

Let's see the full code:

package main

import (
    "github.com/sonyarouje/simdb/db"
    "fmt"
)

type Customer struct {
    CustID string `json:"custid"`
    Name string `json:"name"`
    Address string `json:"address"`
    Contact Contact
}

type Contact struct {
    Phone string `json:"phone"`
    Email string `json:"email"`
}
//ID any struct that needs to persist should implement this function defined 
//in Entity interface.
func (c Customer) ID() (jsonField string, value interface{}) {
    value=c.CustID
    jsonField="custid"
    return
}

func main(){
    fmt.Println("starting....")

    driver, err:=db.New("dbs")

    if(err!=nil){
        panic(err)
    }

    customer:=Customer {
        CustID:"CUST1",
        Name:"sarouje",
        Address: "address",
        Contact: Contact {
            Phone:"45533355",
            Email:"someone@gmail.com",
        },
    }
    //creates a new Customer file inside the directory passed as the 
    //parameter to New(). If the Customer file already exist 
    //then insert operation will add the customer data to the array
    err=driver.Insert(customer)
    if(err!=nil){
        panic(err)
    }

    //GET ALL Customer
    //opens the customer json file and filter all the customers with name sarouje.
    //AsEntity takes an address to Customer array and fills the result to it.
    //we can loop through the customers array and retireve the data.
    var customers []Customer
    err=driver.Open(Customer{}).Where("name","=","sarouje").Get().AsEntity(&customers)
    if(err!=nil){
        panic(err)
    }
    // fmt.Printf("%#v \n", customers)

    //GET ONE Customer
    //First() will return the first record from the results 
    //AsEntity takes the address to Customer variable (not an array pointer)
    var customerFirst Customer
    err=driver.Open(Customer{}).Where("custid","=","CUST1").First().AsEntity(&customerFirst)
    if(err!=nil){
        panic(err)
    }

    //Update function uses the ID() to get the Id field/value to find the record and update the data.
    customerFirst.Name="Sony Arouje"
    err=driver.Update(customerFirst)
    if(err!=nil){
        panic(err)
    }
    driver.Open(Customer{}).Where("custid","=","CUST1").First().AsEntity(&customerFirst)
    fmt.Printf("%#v \n", customerFirst)

    // Delete
    toDel:=Customer{
        CustID:"CUST1",
    }
    err=driver.Delete(toDel)
    if(err!=nil){
        panic(err)
    }
}

TODO

The query syntax in simdb is not really great; I need to find a better approach.

Source Code: https://github.com/sonyarouje/simdb

JSON

Published at DZone with permission of Sony Arouje, DZone MVB. See the original article here.

Opinions expressed by DZone contributors are their own.

Popular on DZone

  • The Real Democratization of AI, and Why It Has to Be Closely Monitored
  • Connecting Your Devs' Work to the Business
  • Silver Bullet or False Panacea? 3 Questions for Data Contracts
  • Apache Kafka Introduction, Installation, and Implementation Using .NET Core 6

Comments

Partner Resources

X

ABOUT US

  • About DZone
  • Send feedback
  • Careers
  • Sitemap

ADVERTISE

  • Advertise with DZone

CONTRIBUTE ON DZONE

  • Article Submission Guidelines
  • Become a Contributor
  • Visit the Writers' Zone

LEGAL

  • Terms of Service
  • Privacy Policy

CONTACT US

  • 600 Park Offices Drive
  • Suite 300
  • Durham, NC 27709
  • support@dzone.com
  • +1 (919) 678-0300

Let's be friends: