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int32.go
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int32.go
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package nulls
import (
"database/sql"
"database/sql/driver"
"encoding/json"
"strconv"
)
// Int32 adds an implementation for int32
// that supports proper JSON encoding/decoding.
type Int32 struct {
Int32 int32
Valid bool // Valid is true if Int32 is not NULL
}
// NewInt32 returns a new, properly instantiated
// Int object.
func NewInt32(i int32) Int32 {
return Int32{Int32: i, Valid: true}
}
// Scan implements the Scanner interface.
func (ns *Int32) Scan(value interface{}) error {
n := sql.NullInt64{Int64: int64(ns.Int32)}
err := n.Scan(value)
ns.Int32, ns.Valid = int32(n.Int64), n.Valid
return err
}
// Value implements the driver Valuer interface.
func (ns Int32) Value() (driver.Value, error) {
if !ns.Valid {
return nil, nil
}
return int64(ns.Int32), nil
}
// MarshalJSON marshals the underlying value to a
// proper JSON representation.
func (ns Int32) MarshalJSON() ([]byte, error) {
if ns.Valid {
return json.Marshal(ns.Int32)
}
return json.Marshal(nil)
}
// UnmarshalJSON will unmarshal a JSON value into
// the propert representation of that value.
func (ns *Int32) UnmarshalJSON(text []byte) error {
txt := string(text)
ns.Valid = true
if txt == "null" {
ns.Valid = false
return nil
}
i, err := strconv.ParseInt(txt, 10, 32)
if err != nil {
ns.Valid = false
return err
}
j := int32(i)
ns.Int32 = j
return nil
}