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sqlite3.go
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sqlite3.go
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// Package sqlite3 implements the Driver interface.
package sqlite3
import (
"database/sql"
"errors"
"fmt"
"strings"
"github.com/gemnasium/migrate/driver"
"github.com/gemnasium/migrate/file"
"github.com/gemnasium/migrate/migrate/direction"
"github.com/mattn/go-sqlite3"
)
type Driver struct {
db *sql.DB
}
const tableName = "schema_migration"
func (driver *Driver) Initialize(url string) error {
filename := strings.SplitN(url, "sqlite3://", 2)
if len(filename) != 2 {
return errors.New("invalid sqlite3:// scheme")
}
db, err := sql.Open("sqlite3", filename[1])
if err != nil {
return err
}
if err := db.Ping(); err != nil {
return err
}
driver.db = db
if err := driver.ensureVersionTableExists(); err != nil {
return err
}
return nil
}
func (driver *Driver) Close() error {
if err := driver.db.Close(); err != nil {
return err
}
return nil
}
func (driver *Driver) ensureVersionTableExists() error {
if _, err := driver.db.Exec("CREATE TABLE IF NOT EXISTS " + tableName + " (version INTEGER PRIMARY KEY AUTOINCREMENT);"); err != nil {
return err
}
return nil
}
func (driver *Driver) FilenameExtension() string {
return "sql"
}
func (driver *Driver) Migrate(f file.File, pipe chan interface{}) {
defer close(pipe)
pipe <- f
tx, err := driver.db.Begin()
if err != nil {
pipe <- err
return
}
if f.Direction == direction.Up {
if _, err := tx.Exec("INSERT INTO "+tableName+" (version) VALUES (?)", f.Version); err != nil {
pipe <- err
if err := tx.Rollback(); err != nil {
pipe <- err
}
return
}
} else if f.Direction == direction.Down {
if _, err := tx.Exec("DELETE FROM "+tableName+" WHERE version=?", f.Version); err != nil {
pipe <- err
if err := tx.Rollback(); err != nil {
pipe <- err
}
return
}
}
if err := f.ReadContent(); err != nil {
pipe <- err
return
}
queries := splitStatements(string(f.Content))
for _, query := range queries {
if _, err := tx.Exec(query); err != nil {
sqliteErr, isErr := err.(sqlite3.Error)
if isErr {
// The sqlite3 library only provides error codes, not position information. Output what we do know.
pipe <- fmt.Errorf("SQLite Error (%s); Extended (%s)\nError: %s",
sqliteErr.Code.Error(), sqliteErr.ExtendedCode.Error(), sqliteErr.Error())
} else {
pipe <- fmt.Errorf("An error occurred when running query [%q]: %v", query, err)
}
if err := tx.Rollback(); err != nil {
pipe <- err
}
return
}
}
if err := tx.Commit(); err != nil {
pipe <- err
return
}
}
// Version returns the current migration version.
func (driver *Driver) Version() (file.Version, error) {
var version file.Version
err := driver.db.QueryRow("SELECT version FROM " + tableName + " ORDER BY version DESC LIMIT 1").Scan(&version)
switch {
case err == sql.ErrNoRows:
return 0, nil
case err != nil:
return 0, err
default:
return version, nil
}
}
// Versions returns the list of applied migrations.
func (driver *Driver) Versions() (file.Versions, error) {
versions := file.Versions{}
rows, err := driver.db.Query("SELECT version FROM " + tableName + " ORDER BY version DESC")
if err != nil {
return versions, err
}
defer rows.Close()
for rows.Next() {
var version file.Version
err := rows.Scan(&version)
if err != nil {
return versions, err
}
versions = append(versions, version)
}
err = rows.Err()
return versions, err
}
func init() {
driver.RegisterDriver("sqlite3", &Driver{})
}
// This naive implementation doesn't account for quoted ";" inside statements.
// It should work for most migrations but can be improved in the future.
func splitStatements(in string) []string {
result := make([]string, 0)
qs := strings.Split(in, ";")
for _, q := range qs {
if q = strings.TrimSpace(q); q != "" {
result = append(result, q+";")
}
}
return result
}