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user.go
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user.go
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package db
import (
"database/sql"
"errors"
"log"
"main/graph/model"
"strings"
)
func UserExists(db *sql.DB, user_name string) bool {
rows, err := db.Query("SELECT * FROM users WHERE name = ?", user_name)
exists := err == nil && rows.Next()
rows.Close()
return exists
}
func AddUser(db *sql.DB, user_name string) error {
if UserExists(db, user_name) {
return errors.New("user already exists")
}
res, err := db.Exec("INSERT INTO users(name, favorites) VALUES (?, '')", user_name)
if err != nil {
log.Println("User insert error:", err)
return err
}
id, err := res.LastInsertId()
if err != nil {
return err
}
log.Printf("User added: '%s' => %d\n", user_name, id)
return nil
}
func UpdateUser(db *sql.DB, user_name string, favorites string) error {
if !UserExists(db, user_name) {
return errors.New("user is not found")
}
res, err := db.Exec("UPDATE users SET favorites = ? WHERE name = ?", favorites, user_name)
if err != nil {
log.Println("User update error: ", err)
return err
}
id, err := res.LastInsertId()
if err != nil {
return err
}
log.Printf("User updated: '%s'[%d] = '%s'\n", user_name, id, favorites)
return nil
}
// func queryUser(db *sql.DB, name *string) ([]*UsersDB, error) {
func GetUsers(db *sql.DB, name *string) ([]*model.User, error) {
query := "SELECT id, name, favorites FROM users"
user_name := ""
if name != nil {
user_name = *name
query += " WHERE name = ?"
}
rows, err := db.Query(query, user_name)
if err != nil {
log.Println("Failed to query users:", err)
return nil, err
}
var users []*model.User
for rows.Next() {
var user model.User
favorite_str := ""
err = rows.Scan(&user.ID, &user.Name, &favorite_str)
if user.ID == -1 || user.Name == "" {
log.Println("Failed to scan user query:", err)
continue
}
if favorite_str != "" {
user.Favorites = strings.Split(favorite_str, ",")
}
users = append(users, &user)
}
return users, nil
}