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database.go
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database.go
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package main
import (
"database/sql"
_ "github.com/mattn/go-sqlite3"
"log"
)
// Database interface
type Database interface {
Get(id int) (string, error)
Save(url string) (int64, error)
}
type sqlite struct {
Path string
}
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()
//result
return id, nil
}
func (s sqlite) Get(id int) (string, error) {
db, err := sql.Open("sqlite3", s.Path)
stmt, err := db.Prepare("select url from urls where id = ?")
if err != nil {
return "", err
}
defer stmt.Close()
var url string
err = stmt.QueryRow(id).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, url text);`
_, err = c.Exec(sqlStmt)
if err != nil {
log.Fatal(err)
}
}