// getKeysForDatabaseDescriptor retrieves the KV keys corresponding to
// the zone, name and descriptor of a database.
func getKeysForDatabaseDescriptor(
dbDesc *sqlbase.DatabaseDescriptor,
) (zoneKey roachpb.Key, nameKey roachpb.Key, descKey roachpb.Key) {
zoneKey = sqlbase.MakeZoneKey(dbDesc.ID)
nameKey = sqlbase.MakeNameMetadataKey(keys.RootNamespaceID, dbDesc.GetName())
descKey = sqlbase.MakeDescMetadataKey(dbDesc.ID)
return
}
// renameDatabase implements the DatabaseAccessor interface.
func (p *planner) renameDatabase(oldDesc *sqlbase.DatabaseDescriptor, newName string) error {
onAlreadyExists := func() error {
return fmt.Errorf("the new database name %q already exists", newName)
}
if p.session.virtualSchemas.isVirtualDatabase(newName) {
return onAlreadyExists()
}
oldName := oldDesc.Name
oldDesc.SetName(newName)
if err := oldDesc.Validate(); err != nil {
return err
}
oldKey := databaseKey{oldName}.Key()
newKey := databaseKey{newName}.Key()
descID := oldDesc.GetID()
descKey := sqlbase.MakeDescMetadataKey(descID)
descDesc := sqlbase.WrapDescriptor(oldDesc)
b := &client.Batch{}
b.CPut(newKey, descID, nil)
b.Put(descKey, descDesc)
b.Del(oldKey)
if err := p.txn.Run(b); err != nil {
if _, ok := err.(*roachpb.ConditionFailedError); ok {
return onAlreadyExists()
}
return err
}
p.setTestingVerifyMetadata(func(systemConfig config.SystemConfig) error {
if err := expectDescriptorID(systemConfig, newKey, descID); err != nil {
return err
}
if err := expectDescriptor(systemConfig, descKey, descDesc); err != nil {
return err
}
return expectDeleted(systemConfig, oldKey)
})
return nil
}
