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database/sql: add note to Scanner that the database owns values

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It was unclear that users must copy values out of the src value
for value types like []byte.

Fixes #24492

Change-Id: I99ad61e0ad0075b9efc5ee4e0d067f752f91b8fa
Reviewed-on: https://go-review.googlesource.com/108535
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Daniel Theophanes 2018-04-20 13:18:09 -07:00 • committed by Brad Fitzpatrick
parent 4122319e5a
commit 94280237f4
1 changed files with 4 additions and 0 deletions
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4
src/database/sql/sql.go
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@ -301,6 +301,10 @@ type Scanner interface {
//
// An error should be returned if the value cannot be stored
// without loss of information.
//
// Reference types such as []byte are only valid until the next call to Scan
// and should not be retained. Their underlying memory is owned by the driver.
// If retention is necessary, copy their values before the next call to Scan.
Scan(src interface{}) error
}