/
mysql-implementation.go
135 lines (124 loc) · 3.4 KB
/
mysql-implementation.go
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package main
import (
"database/sql"
"encoding/json"
"fmt"
"log"
"net/http"
"strconv"
_ "github.com/go-sql-driver/mysql"
"github.com/gorilla/mux"
)
const (
connHost = "localhost"
connPort = "8080"
driverName = "mysql"
dataSourceName = "root:datapassword@/mydb"
)
var db *sql.DB
var connError error
func init() {
db, connError = sql.Open(driverName, dataSourceName)
if connError != nil {
log.Fatal("error connecting to database :: ", connError)
}
}
type Employee struct {
Id int `json:"uid"`
Name string `json:"name"`
}
func createRecord(w http.ResponseWriter, r *http.Request) {
vals := r.URL.Query()
name, ok := vals["name"]
if ok {
log.Print("inserting record in database for name : ", name[0])
stmt, err := db.Prepare("INSERT employee SET name=?")
if err != nil {
log.Print("error preparing query :: ", err)
return
}
result, err := stmt.Exec(name[0])
if err != nil {
log.Print("error executing query :: ", err)
return
}
id, err := result.LastInsertId()
fmt.Fprintf(w, "Last inserted Record Id is :: %s", strconv.FormatInt(id, 10))
} else {
fmt.Fprintf(w, "Error creating record in database for name :: %s", name[0])
}
}
func readRecord(w http.ResponseWriter, r *http.Request) {
log.Print("reading records from database")
rows, err := db.Query("SELECT * FROM employee")
if err != nil {
log.Print("error in select query :: ", err)
return
}
employees := []Employee{}
for rows.Next() {
var uid int
var name string
err = rows.Scan(&uid, &name)
employee := Employee{Id: uid, Name: name}
employees = append(employees, employee)
}
json.NewEncoder(w).Encode(employees)
}
func updateRecord(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
id := vars["id"]
vals := r.URL.Query()
name, ok := vals["name"]
if ok {
log.Print("updating record in database for id :: ", id)
stmt, err := db.Prepare("UPDATE employee SET name=? where uid=?")
if err != nil {
log.Print("error preparing query :: ", err)
return
}
result, err := stmt.Exec(name[0], id)
if err != nil {
log.Print("error executing query :: ", err)
return
}
rowsAffected, err := result.RowsAffected()
fmt.Fprintf(w, "Number of rows updated :: %d", rowsAffected)
} else {
fmt.Fprintf(w, "Error updating record in database for id :: %s", id)
}
}
func deleteRecord(w http.ResponseWriter, r *http.Request) {
vals := r.URL.Query()
name, ok := vals["name"]
if ok {
log.Print("deleting record in database for name :: ", name[0])
stmt, err := db.Prepare("DELETE from employee where name=?")
if err != nil {
log.Print("error preparing query :: ", err)
return
}
result, err := stmt.Exec(name[0])
if err != nil {
log.Print("error executing query :: ", err)
return
}
rowsAffected, err := result.RowsAffected()
fmt.Fprintf(w, "Number of rows deleted in database are :: %d", rowsAffected)
} else {
fmt.Fprintf(w, "Error deleting record in database for name %s", name[0])
}
}
func main() {
router := mux.NewRouter()
router.HandleFunc("/employee/create", createRecord).Methods("POST")
router.HandleFunc("/employees", readRecord).Methods("GET")
router.HandleFunc("/employee/update/{id}", updateRecord).Methods("PUT")
router.HandleFunc("/employee/delete", deleteRecord).Methods("DELETE")
defer db.Close()
err := http.ListenAndServe(connHost+":"+connPort, router)
if err != nil {
log.Fatal("error starting http server :: ", err)
return
}
}