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Clarify row type handling example

pull/716/head
Maxim Ivanov 2020-04-10 18:31:09 +01:00
parent 3286f3111b
commit 198f5093e8
1 changed files with 6 additions and 6 deletions
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12
doc.go
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@ -167,8 +167,8 @@ pgtype.Record first can simplify process by avoiding dealing with raw protocol d
For example: For example:
type MyType struct { type MyType struct {
a int a int // NULL will cause decoding error
b *string b *string // there can be NULL in this position in SQL
} }
func (t *MyType) DecodeBinary(ci *pgtype.ConnInfo, src []byte) error { func (t *MyType) DecodeBinary(ci *pgtype.ConnInfo, src []byte) error {
@ -181,14 +181,14 @@ For example:
} }
if r.Status != pgtype.Present { if r.Status != pgtype.Present {
t = nil return errors.New("BUG: decoding should not be called on NULL value")
return nil
} }
a := r.Fields[0].(*pgtype.Int4) a := r.Fields[0].(*pgtype.Int4)
b := r.Fields[1].(*pgtype.Text) b := r.Fields[1].(*pgtype.Text)
// types compatibility are checked by AssignTo // type compatibility is checked by AssignTo
// only lossless assignments will succeed
if err := a.AssignTo(&t.a); err != nil { if err := a.AssignTo(&t.a); err != nil {
return err return err
} }
@ -201,7 +201,7 @@ For example:
} }
result := MyType{} result := MyType{}
err := conn.QueryRow(context.Background(), "select row(1, 'foo'::text)").Scan(&r) err := conn.QueryRow(context.Background(), "select row(1, 'foo'::text)", pgx.QueryResultFormats{pgx.BinaryFormatCode}).Scan(&r)
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