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update.go
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update.go
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package database
const (
minimalVersion = "1.0"
latestVersion = "1.2"
)
type dbUpdater struct {
version string
updateDb func(db *Database)
}
func UpdateVersion(db *Database) {
currentVersion := db.GetDatabaseVersion()
if currentVersion != latestVersion {
updaters := makeUpdaters(currentVersion, latestVersion)
for _, updater := range updaters {
updater.updateDb(db)
}
db.SetDatabaseVersion(latestVersion)
}
}
func makeUpdaters(versionFrom string, versionTo string) (updaters []dbUpdater) {
allUpdaters := makeAllUpdaters()
isFirstFound := (versionFrom == minimalVersion)
for _, updater := range allUpdaters {
if isFirstFound {
updaters = append(updaters, updater)
if updater.version == versionTo {
break
}
} else {
if updater.version == versionFrom {
isFirstFound = true
updaters = append(updaters, updater)
}
}
}
return
}
func makeAllUpdaters() (updaters []dbUpdater) {
updaters = []dbUpdater{
dbUpdater{
// 1.0 doesn't have version field, so you should add it manually
version: "1.2",
updateDb: func(db *Database) {
db.execQuery("ALTER TABLE users ADD COLUMN banned")
},
},
}
return
}