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database.go
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database.go
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package main
import (
"database/sql"
"log"
_ "github.com/mattn/go-sqlite3"
)
// Database interface
type Database interface {
Get(short string) (string, error)
GetID(longURL string) (int64, string, error)
Save(url string) (int64, error)
saveShort(url string, shortURL string) (int64, error)
shortExists(shortURL string) (bool, error)
getLastID() (int64, error)
setLastID(id int64) (int64, error)
}
type sqlite struct {
Path string
}
func (s sqlite) getLastID() (int64, error) {
db, err := sql.Open("sqlite3", s.Path)
stmt, err := db.Prepare("SELECT value from variables WHERE name = 'short'")
if err != nil {
return 0, err
}
defer stmt.Close()
var id int64
stmt.QueryRow().Scan(&id)
return id, nil
}
func (s sqlite) setLastID(id int64) (int64, error) {
db, err := sql.Open("sqlite3", s.Path)
tx, err := db.Begin()
if err != nil {
return 0, err
}
stmt, err := tx.Prepare("REPLACE INTO variables (name, value) VALUES ('short', ?)")
if err != nil {
return 0, err
}
defer stmt.Close()
result, err := stmt.Exec(id)
if err != nil {
return 0, err
}
newid, err := result.LastInsertId()
if err != nil {
return 0, nil
}
tx.Commit()
return newid, nil
}
func (s sqlite) shortExists(shortURL string) (bool, error) {
db, err := sql.Open("sqlite3", s.Path)
stmt, err := db.Prepare("select 1 from urls where short = ?")
if err != nil {
return false, err
}
defer stmt.Close()
var url int64
stmt.QueryRow(shortURL).Scan(&url)
if url == 1 {
return true, nil
}
return false, nil
}
func (s sqlite) Save(url string) (int64, error) {
db, err := sql.Open("sqlite3", s.Path)
tx, err := db.Begin()
if err != nil {
return 0, err
}
stmt, err := tx.Prepare("insert into urls(url) values(?)")
if err != nil {
return 0, err
}
defer stmt.Close()
result, err := stmt.Exec(url)
if err != nil {
return 0, err
}
id, err := result.LastInsertId()
if err != nil {
return 0, nil
}
tx.Commit()
return id, nil
}
func (s sqlite) saveShort(url string, shortURL string) (int64, error) {
db, err := sql.Open("sqlite3", s.Path)
tx, err := db.Begin()
if err != nil {
return 0, err
}
stmt, err := tx.Prepare("replace into urls(url, short) values(?, ?)")
if err != nil {
return 0, err
}
defer stmt.Close()
result, err := stmt.Exec(url, shortURL)
if err != nil {
return 0, err
}
id, err := result.LastInsertId()
if err != nil {
return 0, nil
}
tx.Commit()
return id, nil
}
func (s sqlite) GetID(longURL string) (int64, string, error) {
db, err := sql.Open("sqlite3", s.Path)
stmt, err := db.Prepare("select id, short from urls where url = ?")
if err != nil {
return 0, "0", err
}
defer stmt.Close()
var id int64
var short string
stmt.QueryRow(longURL).Scan(&id, &short)
return id, short, nil
}
func (s sqlite) Get(short string) (string, error) {
db, err := sql.Open("sqlite3", s.Path)
stmt, err := db.Prepare("select url from urls where short = ?")
if err != nil {
return "", err
}
defer stmt.Close()
var url string
err = stmt.QueryRow(short).Scan(&url)
if err != nil {
return "", err
}
return url, nil
}
func (s sqlite) Init() {
c, err := sql.Open("sqlite3", s.Path)
if err != nil {
log.Fatal(err)
}
defer c.Close()
sqlStmt := `CREATE TABLE if not exists urls (id integer NOT NULL PRIMARY KEY, short varchar (255) NOT NULL UNIQUE, url text NOT NULL);
CREATE INDEX if not exists "short" ON urls (short);
CREATE INDEX if not exists "url" ON urls (url);`
_, err = c.Exec(sqlStmt)
if err != nil {
log.Fatal(err)
}
sqlStmt = `CREATE TABLE if not exists variables (name varchar (255) NOT NULL primary key, value text NOT NULL);`
_, err = c.Exec(sqlStmt)
if err != nil {
log.Fatal(err)
}
}