func openDB() {
if *initialize {
// Delete the old database file
log.Printf(`Removing old db file`)
err := os.Remove(*dbFile)
if err != nil && !os.IsNotExist(err) {
panic(err)
}
}
log.Printf(`Opening sqlite (%s) db file: "%s"`, sqlite.Version(), *dbFile)
var err error
db, err = sqlite.Open(*dbFile)
if err != nil {
panic(err)
}
if *initialize {
// Initialize database structure
log.Printf(`Initializing database`)
for _, stmt := range initStmts {
err := db.Exec(stmt)
if err != nil {
panic(err)
}
}
}
}
func main() {
fmt.Println(sqlite.Version())
conn, err := sqlite.Open("tmp.sqlite")
defer func() {
err := conn.Close()
if err != nil {
fmt.Println(err)
}
}()
if err != nil {
fmt.Println(err)
return
}
err = conn.Exec("CREATE TABLE T1(id int, name string);")
if err != nil {
fmt.Println(err)
return
}
err = conn.Exec("INSERT INTO T1 VALUES(3, \"john\");")
if err != nil {
fmt.Println(err)
return
}
err = conn.Exec("INSERT INTO T1 VALUES(4, \"mark\");")
if err != nil {
fmt.Println(err)
return
}
stmt1, err := conn.Prepare("SELECT NAME FROM T1;")
if err != nil {
fmt.Println(err)
return
}
defer func() {
err := stmt1.Finalize()
if err != nil {
fmt.Println(err)
}
}()
err = stmt1.Exec()
if err != nil {
fmt.Println(err)
return
}
for stmt1.Next() {
// you can parse anything (name, ID) as string
// but parsing name as int will give an error
var s string
err = stmt1.Scan(&s)
if err != nil {
fmt.Println(err)
return
}
fmt.Println(s)
}
stmt2, err := conn.Prepare("SELECT NAME FROM T1 WHERE ID = ?;")
if err != nil {
fmt.Println(err)
return
}
defer func() {
err := stmt2.Finalize()
if err != nil {
fmt.Println(err)
}
}()
// http://sqlite.org/lang_expr.html#varparam
// ?, ?NNN, :VVV, @VVV, $VVV
// It looks like gosqlite binds by index, so only use '?'.
err = stmt2.Exec(3) // you can also use string "3"
if err != nil {
fmt.Println(err)
return
}
for stmt2.Next() {
// you can parse anything (name, ID) as string
// but parsing name as int will give an error
var s string
err = stmt2.Scan(&s)
if err != nil {
fmt.Println(err)
return
}
fmt.Println(s)
}
}
