Membuat CRUD ( Create,Read,Update,Delete ) dengan Golang + MySQL
Buat table di database mysql
CREATE TABLE `Employee` (
`id` int(6) unsigned NOT NULL AUTO_INCREMENT,
`name` varchar(30) NOT NULL,
`city` varchar(30) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=latin1
Program Go
main.go
package main
import (
"database/sql"
"log"
"net/http"
"text/template"
_ "github.com/go-sql-driver/mysql"
)
type Employee struct {
Id int
Name string
City string
}
func dbConn() (db *sql.DB) {
dbDriver := "mysql"
dbUser := "root"
dbPass := "xxxxx"
dbName := "xxxxxdb"
db, err := sql.Open(dbDriver, dbUser+":"+dbPass+"@tcp(xx.xx.xx.xx:3306)/"+dbName)
if err != nil {
panic(err.Error())
}
return db
}
var tmpl = template.Must(template.ParseGlob("form/*"))
func Index(w http.ResponseWriter, r *http.Request) {
db := dbConn()
selDB, err := db.Query("SELECT * FROM Employee ORDER BY id DESC")
if err != nil {
panic(err.Error())
}
emp := Employee{}
res := []Employee{}
for selDB.Next() {
var id int
var name, city string
err = selDB.Scan(&id, &name, &city)
if err != nil {
panic(err.Error())
}
emp.Id = id
emp.Name = name
emp.City = city
res = append(res, emp)
}
tmpl.ExecuteTemplate(w, "Index", res)
defer db.Close()
}
func Show(w http.ResponseWriter, r *http.Request) {
db := dbConn()
nId := r.URL.Query().Get("id")
selDB, err := db.Query("SELECT * FROM Employee WHERE id=?", nId)
if err != nil {
panic(err.Error())
}
emp := Employee{}
for selDB.Next() {
var id int
var name, city string
err = selDB.Scan(&id, &name, &city)
if err != nil {
panic(err.Error())
}
emp.Id = id
emp.Name = name
emp.City = city
}
tmpl.ExecuteTemplate(w, "Show", emp)
defer db.Close()
}
func New(w http.ResponseWriter, r *http.Request) {
tmpl.ExecuteTemplate(w, "New", nil)
}
func Edit(w http.ResponseWriter, r *http.Request) {
db := dbConn()
nId := r.URL.Query().Get("id")
selDB, err := db.Query("SELECT * FROM Employee WHERE id=?", nId)
if err != nil {
panic(err.Error())
}
emp := Employee{}
for selDB.Next() {
var id int
var name, city string
err = selDB.Scan(&id, &name, &city)
if err != nil {
panic(err.Error())
}
emp.Id = id
emp.Name = name
emp.City = city
}
tmpl.ExecuteTemplate(w, "Edit", emp)
defer db.Close()
}
func Insert(w http.ResponseWriter, r *http.Request) {
db := dbConn()
if r.Method == "POST" {
name := r.FormValue("name")
city := r.FormValue("city")
insForm, err := db.Prepare("INSERT INTO Employee(name, city) VALUES(?,?)")
if err != nil {
panic(err.Error())
}
insForm.Exec(name, city)
log.Println("INSERT: Name: " + name + " | City: " + city)
}
defer db.Close()
http.Redirect(w, r, "/", 301)
}
func Update(w http.ResponseWriter, r *http.Request) {
db := dbConn()
if r.Method == "POST" {
name := r.FormValue("name")
city := r.FormValue("city")
id := r.FormValue("uid")
insForm, err := db.Prepare("UPDATE Employee SET name=?, city=? WHERE id=?")
if err != nil {
panic(err.Error())
}
insForm.Exec(name, city, id)
log.Println("UPDATE: Name: " + name + " | City: " + city)
}
defer db.Close()
http.Redirect(w, r, "/", 301)
}
func Delete(w http.ResponseWriter, r *http.Request) {
db := dbConn()
emp := r.URL.Query().Get("id")
delForm, err := db.Prepare("DELETE FROM Employee WHERE id=?")
if err != nil {
panic(err.Error())
}
delForm.Exec(emp)
log.Println("DELETE")
defer db.Close()
http.Redirect(w, r, "/", 301)
}
func main() {
log.Println("Server started on: http://localhost:8080")
http.HandleFunc("/", Index)
http.HandleFunc("/show", Show)
http.HandleFunc("/new", New)
http.HandleFunc("/edit", Edit)
http.HandleFunc("/insert", Insert)
http.HandleFunc("/update", Update)
http.HandleFunc("/delete", Delete)
http.ListenAndServe(":8080", nil)
}
Buat template di direktory form yg isinya:
Edit.tmpl
{{ define "Edit" }}
{{ template "Header" }}
{{ template "Menu" }}
<h2>Edit Name and City</h2>
<form method="POST" action="update">
<input type="hidden" name="uid" value="{{ .Id }}" />
<label> Name </label><input type="text" name="name" value="{{ .Name }}" /><br />
<label> City </label><input type="text" name="city" value="{{ .City }}" /><br />
<input type="submit" value="Save user" />
</form><br />
{{ template "Footer" }}
{{ end }}
Footer.tmpl
{{ define "Footer" }}
</body>
</html>
{{ end }}
Header.tmpl
{{ define "Header" }}
<!DOCTYPE html>
<html lang="en-US">
<head>
<title>Golang Mysql Curd Example</title>
<meta charset="UTF-8" />
</head>
<body>
<h1>Golang Mysql Curd Example</h1>
{{ end }}
Index.tmpl
{{ define "Index" }}
{{ template "Header" }}
{{ template "Menu" }}
<h2> Registered </h2>
<table border="1">
<thead>
<tr>
<td>ID</td>
<td>Name</td>
<td>City</td>
<td>View</td>
<td>Edit</td>
<td>Delete</td>
</tr>
</thead>
<tbody>
{{ range . }}
<tr>
<td>{{ .Id }}</td>
<td> {{ .Name }} </td>
<td>{{ .City }} </td>
<td><a href="/show?id={{ .Id }}">View</a></td>
<td><a href="/edit?id={{ .Id }}">Edit</a></td>
<td><a href="/delete?id={{ .Id }}">Delete</a><td>
</tr>
{{ end }}
</tbody>
</table>
{{ template "Footer" }}
{{ end }}
Menu.tmpl
{{ define "Menu" }}
<a href="/">HOME</a> |
<a href="/new">NEW</a>
{{ end }}
New.tmpl
{{ define "New" }}
{{ template "Header" }}
{{ template "Menu" }}
<h2>New Name and City</h2>
<form method="POST" action="insert">
<label> Name </label><input type="text" name="name" /><br />
<label> City </label><input type="text" name="city" /><br />
<input type="submit" value="Save user" />
</form>
{{ template "Footer" }}
{{ end }}Show.tmpl
{{ define "Show" }}
{{ template "Header" }}
{{ template "Menu" }}
<h2> Register {{ .Id }} </h2>
<p>Name: {{ .Name }}</p>
<p>City: {{ .City }}</p><br /> <a href="/edit?id={{ .Id }}">Edit</a></p>
{{ template "Footer" }}
{{ end }}
Hasil Program jika di jalankan
$ go run main.go
2020/11/25 05:40:50 Server started on: http://localhost:8080
2020/11/25 05:41:24 UPDATE: Name: chandra | City: sdassdd
2020/11/25 05:41:37 UPDATE: Name: chandra | City: Jakarta
2020/11/25 05:41:50 INSERT: Name: Priyo | City: Surabaya
2020/11/25 05:42:03 INSERT: Name: fdfd | City: fdsf
2020/11/25 05:42:06 DELETE
Di sisi web: http://localhost:8080
add:
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