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Update information about NULL handling

Olivier Mengué 2020-02-28 11:12:11 +01:00
parent 92927b5d0b
commit 1a22b4bb41
1 changed files with 4 additions and 4 deletions
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8
SQLInterface.md

@ -114,7 +114,7 @@ If a database column is nullable, one of the types supporting null values should
For example, if the name column in the names table is nullable: For example, if the name column in the names table is nullable:
```go ```go
var name NullString var name sql.NullString
err := db.QueryRowContext(ctx, "SELECT name FROM names WHERE id = $1", id).Scan(&name) err := db.QueryRowContext(ctx, "SELECT name FROM names WHERE id = $1", id).Scan(&name)
... ...
if name.Valid { if name.Valid {
@ -124,6 +124,6 @@ if name.Valid {
} }
``` ```
Only NullBool, NullFloat64, NullInt64 and NullString are implemented in Only [`NullBool`](https://golang.org/pkg/database/sql/#NullBool), [`NullFloat64`](https://golang.org/pkg/database/sql/#NullFloat64), [`NullInt64`](https://golang.org/pkg/database/sql/#NullInt64), [`NullInt32`](https://golang.org/pkg/database/sql/#NullInt32), [`NullString`](https://golang.org/pkg/database/sql/#NullString) and [`NullTime`](https://golang.org/pkg/database/sql/#NullTime) are implemented in
database/sql. Implementations of database-specific null types are left `database/sql`. Implementations of database-specific null types are left
to the database driver. to the database driver. User types supporting `NULL` can be created by implementing interfaces [`database/sql/driver.Valuer`](https://golang.org/pkg/database/sql/driver/#Valuer) and [`database/sql.Scanner`](https://golang.org/pkg/database/sql/#Scanner).