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sqlite_db.go
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sqlite_db.go
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package database_service
import (
"errors"
"log"
"os"
"strconv"
"github.com/leechongyan/Studtor_backend/authentication_service/models"
db_model "github.com/leechongyan/Studtor_backend/database_service/models"
_ "github.com/mattn/go-sqlite3"
"gorm.io/driver/sqlite"
"gorm.io/gorm"
)
// sqlite db
// this sqlite db has to implement all the methods which will be used by DatabaseConnector
type SQLiteDB struct {
DatabaseFilename string
}
func (db *SQLiteDB) Init() {
db.DatabaseFilename = "../studtor.db"
// check if database already exists
if _, err := os.Stat(db.DatabaseFilename); err == nil {
// file exists
log.Println("Database file " + db.DatabaseFilename + " exists.")
log.Println("Loading existing database file...")
} else if os.IsNotExist(err) {
// file does not exist
log.Println("Database file " + db.DatabaseFilename + " does not exist.")
log.Println("Creating new database file...")
// Initialize database
log.Println("Migrating schema from GORM...")
conn, err := gorm.Open(sqlite.Open(db.DatabaseFilename), &gorm.Config{})
if err != nil {
log.Fatal(err)
}
// Migrate the schema
conn.AutoMigrate(&db_model.User{})
conn.AutoMigrate(&db_model.Course{})
conn.AutoMigrate(&db_model.Tutor{})
log.Println("Database initialized successfully.")
} else {
// Schrodinger: file may or may not exist. See err for details.
// Therefore, do *NOT* use !os.IsNotExist(err) to test for file existence
log.Fatal(err)
}
}
// SaveUser saves the user to the database.
// Note that if the user is a new user, several fields
// would not have been initialized yet.
func (db SQLiteDB) SaveUser(user models.User) (err error) {
conn, err := gorm.Open(sqlite.Open(db.DatabaseFilename), &gorm.Config{})
if err != nil {
// err opening database
log.Println(err)
return
}
var db_user db_model.User
found := true
// Get user if exists
result := conn.First(&db_user, "email = ?", *user.Email)
if errors.Is(result.Error, gorm.ErrRecordNotFound) {
// row not found
found = false
}
// Update user
db_user.First_name = *user.First_name
db_user.Last_name = *user.Last_name
db_user.Password = *user.Password
db_user.Email = *user.Email
db_user.User_type = *user.User_type
if user.Token != nil {
db_user.Token.String = *user.Token
db_user.Token.Valid = true
}
if user.Refresh_token != nil {
db_user.Refresh_token.String = *user.Refresh_token
db_user.Refresh_token.Valid = true
}
if user.V_key != nil {
db_user.V_key.String = *user.V_key
db_user.V_key.Valid = true
}
if user.Verified {
db_user.Verified = 1
} else {
db_user.Verified = 0
}
if user.Created_at.IsZero() {
db_user.Created_at.Time = user.Created_at
db_user.Created_at.Valid = true
}
if user.Updated_at.IsZero() {
db_user.Updated_at.Time = user.Updated_at
db_user.Updated_at.Valid = true
}
if found {
// update existing record
result = conn.Save(&db_user)
if result.Error != nil {
err = result.Error
return
}
} else {
// create new record
result = conn.Create(&db_user)
if result.Error != nil {
err = result.Error
return
}
}
return
}
// GetUser retrieves the user to the database.
func (db SQLiteDB) GetUser(email string) (user models.User, err error) {
conn, err := gorm.Open(sqlite.Open(db.DatabaseFilename), &gorm.Config{})
if err != nil {
// err opening database
log.Println(err)
return
}
var db_user db_model.User
// Get user if exists
result := conn.First(&db_user, "email = ?", email)
if result.Error != nil {
// row not found
err = result.Error
return
}
user = models.User{}
// Convert variables to their golang datatypes
user.First_name = &db_user.First_name
user.Last_name = &db_user.Last_name
user.Password = &db_user.Password
email_ref := email
user.Email = &email_ref
user.User_type = &db_user.User_type
if db_user.Token.Valid {
// token is not null
user.Token = &db_user.Token.String
}
if db_user.Refresh_token.Valid {
// refresh_token is not null
user.Refresh_token = &db_user.Refresh_token.String
}
if db_user.V_key.Valid {
// v_key is not null
user.V_key = &db_user.V_key.String
}
if db_user.Verified == 0 {
user.Verified = false
} else {
user.Verified = true
}
if db_user.Created_at.Valid {
// Created_at is not null
user.Created_at = db_user.Created_at.Time
}
if db_user.Updated_at.Valid {
// Created_at is not null
user.Updated_at = db_user.Updated_at.Time
}
return
}
func (db SQLiteDB) GetAllCourses(from string, size int) (courses []string, err error) {
// convert from to int
i, _ := strconv.Atoi(from)
conn, err := gorm.Open(sqlite.Open(db.DatabaseFilename), &gorm.Config{})
if err != nil {
// err opening database
log.Println(err)
return
}
var db_courses []db_model.Course
courses = make([]string, 0)
// fetch courses
result := conn.Where("id >= ? AND id <= ?", i, i+size).Find(&db_courses)
if result.Error != nil {
// row not found
err = result.Error
return
}
// save db_courses to courses
for i := 0; i < int(result.RowsAffected); i++ {
courses = append(courses, db_courses[i].Course_code)
}
return
}
func (db SQLiteDB) GetAllTutors(from string, size int) (tutors []string, err error) {
// convert from to int
i, _ := strconv.Atoi(from)
conn, err := gorm.Open(sqlite.Open(db.DatabaseFilename), &gorm.Config{})
if err != nil {
// err opening database
log.Println(err)
return
}
var db_tutors []db_model.Tutor
tutors = make([]string, 0)
// fetch courses
result := conn.Where("id >= ? AND id <= ?", i, i+size).Find(&db_tutors)
if result.Error != nil {
// row not found
err = result.Error
return
}
// save db_courses to courses
for i := 0; i < int(result.RowsAffected); i++ {
tutors = append(tutors, db_tutors[i].Tutor_name)
}
return
}