https://github.com/walchand-linux-users-group/metamorphosis_2k24_go_project
A command line application to manage student
https://github.com/walchand-linux-users-group/metamorphosis_2k24_go_project
Last synced: 4 months ago
JSON representation
A command line application to manage student
- Host: GitHub
- URL: https://github.com/walchand-linux-users-group/metamorphosis_2k24_go_project
- Owner: Walchand-Linux-Users-Group
- Created: 2024-03-23T17:03:38.000Z (over 1 year ago)
- Default Branch: main
- Last Pushed: 2024-07-25T04:01:07.000Z (11 months ago)
- Last Synced: 2025-01-06T05:32:45.153Z (6 months ago)
- Language: Go
- Size: 6.84 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# Metamorphosis 2k24: GoLang Project
### Folder Structure
```bash
Student-DB
├── main.go
├── db.txt
└── features
└── features.go
```
---
### main.go starter code
```go
package main
import (
"fmt"
)
func main() {
fmt.Println("Hello, World!")
}
```
---
### features.go
#### Structs
```go
package features
//Note these are final dependencies and if they give any error just comment unused ones for time being.
import (
"bufio"
"fmt"
"os"
"strconv"
"strings"
)
type Student struct {
Name string
RollNo string
Marks int
}
type Class struct {
Engineers []Student
}
```
---
#### Taking input from user
```go
func inputName() string {
fmt.Println("Enter your first name")
var name string
fmt.Scanln(&name)
return name
}
func inputRoll() string {
fmt.Println("Enter your roll no")
var roll string
fmt.Scanln(&roll)
return roll
}
func inputMarks() int {
fmt.Println("Enter your marks")
var marks int
fmt.Scanln(&marks)
return marks
}
```
---
#### New Class Function
```go
func (c *Class) NewClass() {
// fmt.Println(entry)
var studentsArray []Student
file, err := os.Open("db.txt")
if err != nil {
panic(err)
}
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line := scanner.Text()
fields := strings.Split(line, " ")
marks, _ := strconv.Atoi(fields[2])
entry := Student{
Name: fields[0],
RollNo: fields[1],
Marks: marks,
}
studentsArray = append(studentsArray, entry)
}
// fmt.Println(studentsArray)
c.Engineers = studentsArray
}
```
---
#### Add Student Function
```go
func (c *Class) AddStudent() {
name := inputName()
roll := inputRoll()
marks := inputMarks()
entry := Student{
Name: name,
RollNo: roll,
Marks: marks,
}
c.Engineers = append(c.Engineers, entry)
fmt.Println("Student Added Successfully")
fmt.Println()
//Update this data in the db.txt
}
```
---
#### Show Students Function
```go
func (c *Class) ShowStudents() {
for _, student := range c.Engineers {
name, roll, marks := student.Name, student.RollNo, student.Marks
fmt.Printf("Name: %s\nRoll No: %s\nMarks: %d\n", name, roll, marks)
fmt.Println()
}
}
```
---
#### Update Student Function
```go
func (c *Class) UpdateStudent() {
roll := inputRoll()
// find the student
index := 0
for ind, stu := range c.Engineers {
if stu.RollNo == roll {
index = ind
break
}
}
// get the data
newName := inputName()
newMarks := inputMarks()
// change the data
c.Engineers[index] = Student{
RollNo: roll,
Name: newName,
Marks: newMarks,
}
}
```
---
#### Delete Student Function
```go
func (c *Class) DeleteStudent() {
// get the data
roll := inputRoll()
index := 0
// find the index
for idx, student := range c.Engineers {
if student.RollNo == roll {
index = idx
}
}
// remove the student
c.Engineers = append(c.Engineers[:index], c.Engineers[index+1:]...)
}
```
---
#### Write To File Function
```go
func (c *Class) writeToFile(wg *sync.WaitGroup) {
// convert []Student into string
var result []string
for _, val := range c.Engineers {
current := fmt.Sprintf("%v %v %v", val.Name, val.RollNo, val.Marks)
result = append(result, current)
}
err := os.WriteFile("db.txt", []byte(strings.Join(result, "\n")), 0644)
if err != nil {
fmt.Println(err.Error())
}
}
```
---
#### Final main.go
```go
package main
import (
"fmt"
"os"
features "student-db/Features"
)
func displayChoices() {
fmt.Println("Select one of the choices")
fmt.Println("1. Add a new Student")
fmt.Println("2. Show all Students")
fmt.Println("3. Update Student")
fmt.Println("4. Delete Student")
fmt.Println("5. Exit")
}
func main() {
fmt.Println("Welcome to student DB")
var class features.Class
class.NewClass()
for {
displayChoices()
var choice int
fmt.Scanln(&choice)
switch choice {
case 1:
class.AddStudent()
case 2:
class.ShowStudents()
case 3:
class.UpdateStudent()
case 4:
class.DeleteStudent()
case 5:
os.Exit(0)
default:
fmt.Println("Invalid choice")
}
}
}
```
---
#### Final features.go
```go
package features
//Note these are final dependencies and if they give any erro just comment unused ones for time being.
import (
"bufio"
"fmt"
"os"
"strconv"
"strings"
"sync"
)
type Student struct {
Name string
RollNo string
Marks int
}
type Class struct {
Engineers []Student
}
func inputName() string {
fmt.Println("Enter your first name")
var name string
fmt.Scanln(&name)
return name
}
func inputRoll() string {
fmt.Println("Enter your roll no")
var roll string
fmt.Scanln(&roll)
return roll
}
func inputMarks() int {
fmt.Println("Enter your marks")
var marks int
fmt.Scanln(&marks)
return marks
}
func (c *Class) NewClass() {
// fmt.Println(entry)
var studentsArray []Student
file, err := os.Open("db.txt")
if err != nil {
panic(err)
}
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line := scanner.Text()
fields := strings.Split(line, " ")
marks, _ := strconv.Atoi(fields[2])
entry := Student{
Name: fields[0],
RollNo: fields[1],
Marks: marks,
}
studentsArray = append(studentsArray, entry)
}
// fmt.Println(studentsArray)
c.Engineers = studentsArray
}
func (c *Class) AddStudent() {
name := inputName()
roll := inputRoll()
marks := inputMarks()
entry := Student{
Name: name,
RollNo: roll,
Marks: marks,
}
c.Engineers = append(c.Engineers, entry)
fmt.Println("Student Added Successfully")
fmt.Println()
//Update this data in the db.txt
}
func (c *Class) ShowStudents() {
for _, student := range c.Engineers {
name, roll, marks := student.Name, student.RollNo, student.Marks
fmt.Printf("Name: %s\nRoll No: %s\nMarks: %d\n", name, roll, marks)
fmt.Println()
}
}
func (c *Class) UpdateStudent() {
roll := inputRoll()
// find the student
index := 0
for ind, stu := range c.Engineers {
if stu.RollNo == roll {
index = ind
break
}
}
// get the data
newName := inputName()
newMarks := inputMarks()
// change the data
c.Engineers[index] = Student{
RollNo: roll,
Name: newName,
Marks: newMarks,
}
}
func (c *Class) DeleteStudent() {
// get the data
roll := inputRoll()
index := 0
// find the index
for idx, student := range c.Engineers {
if student.RollNo == roll {
index = idx
}
}
// remove the student
c.Engineers = append(c.Engineers[:index], c.Engineers[index+1:]...)
}
func (c *Class) writeToFile(wg *sync.WaitGroup) {
// convert []Student into string
var result []string
for _, val := range c.Engineers {
current := fmt.Sprintf("%v %v %v", val.Name, val.RollNo, val.Marks)
result = append(result, current)
}
err := os.WriteFile("db.txt", []byte(strings.Join(result, "\n")), 0644)
if err != nil {
fmt.Println(err.Error())
}
}
```