json.go
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json.go
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	package converter

	import (
	"database/sql"
	"encoding/json"
	"reflect"
	)

	type NullJSONBool struct {
	sql.NullBool
	}

	func JSONNullBool(value string) reflect.Value {
	v := NullJSONBool{}

	if value == "on" \|\| value == "off" {
	return reflect.ValueOf(NullJSONBool{sql.NullBool{Bool: value == "on", Valid: true}})
	}
	if err := v.Scan(value); err != nil {
	return reflect.Value{}
	}
	return reflect.ValueOf(v)
	}

	func (v NullJSONBool) MarshalJSON() ([]byte, error) {
	if v.Valid {
	return json.Marshal(v.Bool)
	} else {
	return json.Marshal(nil)
	}
	}

	func (v *NullJSONBool) UnmarshalJSON(data []byte) error {
	// Unmarshalling into a pointer will let us detect null
	var x *bool
	if err := json.Unmarshal(data, &x); err != nil {
	return err
	}
	if x != nil {
	v.Valid = true
	v.Bool = *x
	} else {
	v.Valid = false
	}
	return nil
	}

	type NullJSONString struct {
	sql.NullString
	}

	func JSONNullString(value string) reflect.Value {
	v := NullJSONString{}
	if err := v.Scan(value); err != nil {
	return reflect.Value{}
	}

	return reflect.ValueOf(v)
	}

	func (v NullJSONString) MarshalJSON() ([]byte, error) {
	if v.Valid {
	return json.Marshal(v.String)
	} else {
	return json.Marshal(nil)
	}
	}

	func (v *NullJSONString) UnmarshalJSON(data []byte) error {
	// Unmarshalling into a pointer will let us detect null
	var x *string
	if err := json.Unmarshal(data, &x); err != nil {
	return err
	}
	if x != nil {
	v.Valid = true
	v.String = *x
	} else {
	v.Valid = false
	}
	return nil
	}