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Beego/migration/migration.go
2014-08-14 10:19:55 +08:00

251 lines
5.5 KiB
Go

// Beego (http://beego.me/)
//
// @description beego is an open-source, high-performance web framework for the Go programming language.
//
// @link http://github.com/astaxie/beego for the canonical source repository
//
// @license http://github.com/astaxie/beego/blob/master/LICENSE
//
// @authors astaxie
//
// CREATE TABLE `migrations` (
// `id_migration` int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT 'surrogate key',
// `name` varchar(255) DEFAULT NULL COMMENT 'migration name, unique',
// `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT 'date migrated or rolled back',
// `statements` longtext COMMENT 'SQL statements for this migration',
// `rollback_statements` longtext,
// `status` enum('update','rollback') DEFAULT NULL COMMENT 'update indicates it is a normal migration while rollback means this migration is rolled back',
// PRIMARY KEY (`id_migration`)
// ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
package migration
import (
"errors"
"sort"
"strings"
"time"
"github.com/astaxie/beego"
"github.com/astaxie/beego/orm"
)
// const the data format for the bee generate migration datatype
const (
M_DATE_FORMAT = "20060102_150405"
M_DB_DATE_FORMAT = "2006-01-02 15:04:05"
)
// Migrationer is an interface for all Migration struct
type Migrationer interface {
Up()
Down()
Exec(name, status string) error
GetCreated() int64
}
var (
migrationMap map[string]Migrationer
SkipReset []string
)
func init() {
migrationMap = make(map[string]Migrationer)
}
// the basic type which will implement the basic type
type Migration struct {
sqls []string
Created string
}
// implement in the Inheritance struct for upgrade
func (m *Migration) Up() {
}
// implement in the Inheritance struct for down
func (m *Migration) Down() {
}
// add sql want to execute
func (m *Migration) Sql(sql string) {
m.sqls = append(m.sqls, sql)
}
// execute the sql already add in the sql
func (m *Migration) Exec(name, status string) error {
o := orm.NewOrm()
for _, s := range m.sqls {
beego.Info("exec sql:", s)
r := o.Raw(s)
_, err := r.Exec()
if err != nil {
return err
}
}
return m.addOrUpdateRecord(name, status)
}
func (m *Migration) addOrUpdateRecord(name, status string) error {
o := orm.NewOrm()
if status == "down" {
status = "rollback"
p, err := o.Raw("update migrations set status = ?, rollback_statements = ? where name = ?").Prepare()
if err != nil {
return nil
}
_, err = p.Exec(status, strings.Join(m.sqls, "; "), name)
return err
} else {
status = "update"
p, err := o.Raw("insert into migrations(`name`, `created_at`, `statements`, `status`) values(?,?,?,?)").Prepare()
if err != nil {
return err
}
t, err := time.Parse(M_DATE_FORMAT, m.Created)
if err != nil {
return err
}
_, err = p.Exec(name, t.Format(M_DB_DATE_FORMAT), strings.Join(m.sqls, "; "), status)
return err
}
}
// get the unixtime from the Created
func (m *Migration) GetCreated() int64 {
t, err := time.Parse(M_DATE_FORMAT, m.Created)
if err != nil {
return 0
}
return t.Unix()
}
// register the Migration in the map
func Register(name string, m Migrationer) error {
if _, ok := migrationMap[name]; ok {
return errors.New("already exist name:" + name)
}
migrationMap[name] = m
return nil
}
// upgrate the migration from lasttime
func Upgrade(lasttime int64) error {
sm := sortMap(migrationMap)
i := 0
for _, v := range sm {
if v.created > lasttime {
beego.Info("start upgrade", v.name)
v.m.Up()
err := v.m.Exec(v.name, "up")
if err != nil {
beego.Error("execute error:", err)
time.Sleep(2 * time.Second)
return err
}
beego.Info("end upgrade:", v.name)
i++
}
}
beego.Info("total success upgrade:", i, " migration")
return nil
}
//rollback the migration by the name
func Rollback(name string) error {
if v, ok := migrationMap[name]; ok {
beego.Info("start rollback")
v.Down()
err := v.Exec(name, "down")
if err != nil {
beego.Error("execute error:", err)
time.Sleep(2 * time.Second)
return err
}
beego.Info("end rollback")
return nil
} else {
return errors.New("not exist the migrationMap name:" + name)
}
}
// reset all migration
// run all migration's down function
func Reset() error {
i := 0
for k, v := range migrationMap {
if inSlice(k, SkipReset) {
beego.Info("skip the", k)
continue
}
beego.Info("start reset:", k)
v.Down()
err := v.Exec(k, "down")
if err != nil {
beego.Error("execute error:", err)
time.Sleep(2 * time.Second)
return err
}
beego.Info("end reset:", k)
}
beego.Info("total success reset:", i, " migration")
return nil
}
// first Reset, then Upgrade
func Refresh() error {
err := Reset()
if err != nil {
beego.Error("execute error:", err)
time.Sleep(2 * time.Second)
return err
}
return Upgrade(0)
}
type dataSlice []data
type data struct {
created int64
name string
m Migrationer
}
// Len is part of sort.Interface.
func (d dataSlice) Len() int {
return len(d)
}
// Swap is part of sort.Interface.
func (d dataSlice) Swap(i, j int) {
d[i], d[j] = d[j], d[i]
}
// Less is part of sort.Interface. We use count as the value to sort by
func (d dataSlice) Less(i, j int) bool {
return d[i].created < d[j].created
}
func sortMap(m map[string]Migrationer) dataSlice {
s := make(dataSlice, 0, len(m))
for k, v := range m {
d := data{}
d.created = v.GetCreated()
d.name = k
d.m = v
s = append(s, d)
}
sort.Sort(s)
return s
}
func inSlice(key string, sli []string) bool {
for _, v := range sli {
if v == key {
return true
}
}
return false
}