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[doc] Add docs for basestore map scanner (#48281)

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## Description

[Old docs are
here](https://docs.sourcegraph.com/dev/background-information/basestore#using-basestore-helpers-for-scanning)

[New docs are
here](https://docs.sourcegraph.com/@milan_basestore_docs/dev/background-information/basestore#using-basestore-helpers-for-scanning)

New docs can be seen here:

## Test plan

since it's just docs changes, eyeballing 👀
This commit is contained in:
Milan Freml 2023-02-27 17:10:33 +01:00 committed by GitHub
parent 03ff546503
commit 476ce7d826
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1 changed files with 24 additions and 0 deletions
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doc/dev/background-information/basestore.md
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@ -198,6 +198,18 @@ func (s *MyStore) ItsHorsegraphTime(ctx context.Context) error {
if err != nil {
return err
}
// Scan map[string]int32
horseNameToID, err := scanHorseNameToID(s.Query(ctx, sqlf.Sprintf("SELECT id, name FROM horses"))) {
if err != nil {
return err
}
// Scan map[string]horse
horseMap, err := scanMapHorses(s.Query(ctx, sqlf.Sprintf("SELECT id, age, name, nicknames, passportName FROM horses")))
if err != nil {
return err
}
}
// scanHorses can scan a row of `horse`s into `[]*horse`
@ -212,6 +224,18 @@ func scanHorse(s dbutil.Scanner) (*horse, error) {
return &h, nil
}
var scanHorseNameToID = basestore.NewMapScanner(func(s dbutil.Scanner) (string, int32, error) {
var id int32
var name string
err := s.Scan(&id, &name)
return name, id, err
})
var scanMapHorses = basestore.NewMapScanner(func(s dbutil.Scanner) (string, *horse, error) {
h, err := scanHorse(s)
return h.name, h, err
})
type horse struct {
id int32
age int32