func countEntriesWithPrefix(ctx context.Context, prefix []byte) (int, error) {
txn, err := ctx.GetTxn(false)
if err != nil {
return 0, err
}
cnt := 0
err = util.ScanMetaWithPrefix(txn, prefix, func(k kv.Key, v []byte) bool {
cnt++
return true
})
return cnt, err
}
func (do *Domain) loadInfoSchema(txn kv.Transaction) (err error) {
var schemas []*model.DBInfo
err = util.ScanMetaWithPrefix(txn, meta.SchemaMetaPrefix, func(key []byte, value []byte) bool {
di := &model.DBInfo{}
err := json.Unmarshal(value, di)
if err != nil {
log.Fatal(err)
}
schemas = append(schemas, di)
return true
})
if err != nil {
return errors.Trace(err)
}
schemaMetaVersion, err := txn.GetInt64(meta.SchemaMetaVersionKey)
if err != nil {
return
}
log.Info("loadInfoSchema %d", schemaMetaVersion)
do.infoHandle.Set(schemas, schemaMetaVersion)
return
}