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float.go
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float.go
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package null
import (
"database/sql/driver"
"encoding/json"
"fmt"
"strconv"
)
type Float64 struct {
float float64
valid bool
}
func (f *Float64) Set(val float64) {
f.float = val
f.valid = true
}
func (f *Float64) Get() float64 {
if !f.valid {
return 0.0
}
return f.float
}
func (f *Float64) Null() bool {
return f.valid
}
func (f *Float64) Nullify() {
f.valid = false
}
func (f Float64) String() string {
if f.valid {
return strconv.FormatFloat(f.float, 'e', -1, 64)
}
return "null"
}
func (f Float64) MarshalJSON() ([]byte, error) {
if f.valid {
return json.Marshal(f.float)
}
return json.Marshal(nil)
}
func (f *Float64) UnmarshalJSON(data []byte) (err error) {
var temp *float64
if err = json.Unmarshal(data, &temp); err != nil {
return
}
if temp != nil {
f.valid = true
f.float = *temp
} else {
f.valid = false
}
return
}
func (f *Float64) Scan(value interface{}) (err error) {
switch v := value.(type) {
case nil:
f.valid = false
return
case float64:
f.float, f.valid = v, true
return
case []uint8:
if f.float, err = strconv.ParseFloat(string(v), 64); err == nil {
f.valid = true
}
return
default:
return fmt.Errorf("not supported: %T %v", value, value)
}
}
func (f Float64) Value() (driver.Value, error) {
if f.valid {
return f.float, nil
}
return nil, nil
}