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postgres.go
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postgres.go
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// Package postgres implements the Driver interface.
package postgres
import (
"database/sql"
"errors"
"fmt"
"strconv"
"github.com/lib/pq"
"gopkg.in/mattes/migrate.v1/driver"
"gopkg.in/mattes/migrate.v1/file"
"gopkg.in/mattes/migrate.v1/migrate/direction"
)
type Driver struct {
db *sql.DB
}
const tableName = "schema_migrations"
func (driver *Driver) Initialize(url string) error {
db, err := sql.Open("postgres", url)
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 {
r := driver.db.QueryRow("SELECT count(*) FROM information_schema.tables WHERE table_name = $1 AND table_schema = (SELECT current_schema());", tableName)
c := 0
if err := r.Scan(&c); err != nil {
return err
}
if c > 0 {
return nil
}
if _, err := driver.db.Exec("CREATE TABLE IF NOT EXISTS " + tableName + " (version bigint not null primary key);"); 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 ($1)", 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=$1", f.Version); err != nil {
pipe <- err
if err := tx.Rollback(); err != nil {
pipe <- err
}
return
}
}
if err := f.ReadContent(); err != nil {
pipe <- err
return
}
if _, err := tx.Exec(string(f.Content)); err != nil {
switch pqErr := err.(type) {
case *pq.Error:
offset, err := strconv.Atoi(pqErr.Position)
if err == nil && offset >= 0 {
lineNo, columnNo := file.LineColumnFromOffset(f.Content, offset-1)
errorPart := file.LinesBeforeAndAfter(f.Content, lineNo, 5, 5, true)
pipe <- errors.New(fmt.Sprintf("%s %v: %s in line %v, column %v:\n\n%s", pqErr.Severity, pqErr.Code, pqErr.Message, lineNo, columnNo, string(errorPart)))
} else {
pipe <- errors.New(fmt.Sprintf("%s %v: %s", pqErr.Severity, pqErr.Code, pqErr.Message))
}
if err := tx.Rollback(); err != nil {
pipe <- err
}
return
default:
pipe <- err
if err := tx.Rollback(); err != nil {
pipe <- err
}
return
}
}
if err := tx.Commit(); err != nil {
pipe <- err
return
}
}
func (driver *Driver) Version() (uint64, error) {
var version uint64
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
}
}
func init() {
drv := Driver{}
driver.RegisterDriver("postgres", &drv)
driver.RegisterDriver("postgresql", &drv)
}