rtcusertr/database/database.go

package database

import (
	"database/sql"
	"log"

	"gitlab.dedyn.io/AUDIAG/rtcusertr/domain"

	_ "github.com/go-sql-driver/mysql"
)

var (
	dbConnection = "rtcusertrdbuser:hurtz3585@tcp(ubodroid-1:3306)/rtcusertrdb"
	dbType       = "mysql"
)

// Tool Funktionen
func CreateKnoten(knoten domain.KnotenE) (resKnoten domain.KnotenE, err error) {
	conn, err := sql.Open(dbType, dbConnection)
	if err != nil {
		log.Println("Error while connecting DB: ", err)
	}
	log.Println("Verbindung hergestellt")
	log.Println("Name = ", knoten.Fachbereich)
	defer conn.Close()

	res, err := conn.Exec("INSERT INTO knoten VALUES(?,?,?,?)", knoten.Id, knoten.Fachbereich, knoten.Anzahl, knoten.Tag)
	if err != nil {
		log.Println("Error while executing insert statement", err)
	}
	lastId, err := res.LastInsertId()
	knoten.Id = uint(lastId)
	resKnoten = knoten

	return resKnoten, err
}

func DeleteKnoten(knotenId uint) (result, err error) {
	conn, err := sql.Open(dbType, dbConnection)
	if err != nil {
		log.Println("Error while connecting DB: ", err)
	}
	log.Println("DB Verbindung hergestellt")
	defer conn.Close()

	_, err = conn.Exec("DELETE FROM knoten WHERE id = ?", knotenId)
	if err != nil {
		log.Fatal("Error while executing DELETE statement", err)
	}
	return result, err
}

func ShowKnoten() (knotenArray []domain.KnotenE, err error) {
	conn, err := sql.Open(dbType, dbConnection)
	if err != nil {
		log.Println("Error while connecting DB: ", err)
	}
	log.Println("DB Verbindung hergestellt")
	defer conn.Close()

	results, err := conn.Query("SELECT * FROM knoten")
	if err != nil {
		log.Fatal("Error while executing SELECt statement", err)
	}

	var knoten domain.KnotenE
	for results.Next() {
		err = results.Scan(&knoten.Id, &knoten.Fachbereich, &knoten.Anzahl, &knoten.Tag)
		if err != nil {
			log.Fatal("Error: ", err)
		}
		knotenArray = append(knotenArray, knoten)
	}
	return knotenArray, err
}

func GetKnoten(id uint) (knoten domain.KnotenE, err error) {
	conn, err := sql.Open(dbType, dbConnection)
	if err != nil {
		log.Println("Error while connecting DB: ", err)
	}
	log.Println("DB Verbindung hergestellt")
	defer conn.Close()

	results, err := conn.Query("SELECT * FROM knoten WHERE id=?", id)
	if err != nil {
		log.Fatal("Error while executing SELECt statement", err)
	}
	for results.Next() {
		err = results.Scan(&knoten.Id, &knoten.Fachbereich, &knoten.Anzahl, &knoten.Tag)
		if err != nil {
			log.Fatal("Error: ", err)
		}
	}

	return knoten, err
}

func UpdateKnoten(knoten domain.KnotenE) (resKnoten domain.KnotenE, err error) {
	conn, err := sql.Open(dbType, dbConnection)
	if err != nil {
		log.Println("Error while connecting DB: ", err)
	}
	log.Println("Verbindung hergestellt")
	log.Println("Name = ", knoten.Fachbereich)
	defer conn.Close()

	_, err = conn.Exec("UPDATE knoten SET fachbereich=?, anzahl=?, tag=? WHERE id=?", knoten.Fachbereich, knoten.Anzahl, knoten.Tag, knoten.Id)
	if err != nil {
		log.Println("Error while executing insert statement", err)
	}

	resKnoten = knoten

	return resKnoten, err
}