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nullables.go
6.15 KB
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merged with util ...
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package webutility |
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import (
"database/sql"
"database/sql/driver"
"encoding/json"
"fmt"
"time"
)
// NullBool is a wrapper for sql.NullBool with added JSON (un)marshalling
type NullBool sql.NullBool
// Scan ...
func (nb *NullBool) Scan(value interface{}) error {
var b sql.NullBool
if err := b.Scan(value); err != nil {
nb.Bool, nb.Valid = false, false
return err
}
nb.Bool, nb.Valid = b.Bool, b.Valid
return nil
}
// Value ...
func (nb *NullBool) Value() (driver.Value, error) {
if !nb.Valid {
return nil, nil
}
return nb.Bool, nil
}
// MarshalJSON ...
func (nb NullBool) MarshalJSON() ([]byte, error) {
if nb.Valid {
return json.Marshal(nb.Bool)
}
return json.Marshal(nil)
}
// UnmarshalJSON ...
func (nb *NullBool) UnmarshalJSON(b []byte) error {
var temp *bool
if err := json.Unmarshal(b, &temp); err != nil {
return err
}
if temp != nil {
nb.Valid = true
nb.Bool = *temp
} else {
nb.Valid = false
}
return nil
}
// SQLCast ...
func (nb *NullBool) SQLCast() sql.NullBool {
return sql.NullBool(*nb)
}
// NullString is a wrapper for sql.NullString with added JSON (un)marshalling
type NullString sql.NullString
// Scan ...
func (ns *NullString) Scan(value interface{}) error {
var s sql.NullString
if err := s.Scan(value); err != nil {
ns.String, ns.Valid = "", false
return err
}
ns.String, ns.Valid = s.String, s.Valid
return nil
}
// Value ...
func (ns *NullString) Value() (driver.Value, error) {
if !ns.Valid {
return nil, nil
}
return ns.String, nil
}
// MarshalJSON ...
func (ns NullString) MarshalJSON() ([]byte, error) {
if ns.Valid {
return json.Marshal(ns.String)
}
return json.Marshal(nil)
}
// UnmarshalJSON ...
func (ns *NullString) UnmarshalJSON(b []byte) error {
var temp *string
if err := json.Unmarshal(b, &temp); err != nil {
return err
}
if temp != nil {
ns.Valid = true
ns.String = *temp
} else {
ns.Valid = false
}
return nil
}
// SQLCast ...
func (ns *NullString) SQLCast() sql.NullString {
return sql.NullString(*ns)
}
// NullInt64 is a wrapper for sql.NullInt64 with added JSON (un)marshalling
type NullInt64 sql.NullInt64
// Scan ...
func (ni *NullInt64) Scan(value interface{}) error {
var i sql.NullInt64
if err := i.Scan(value); err != nil {
ni.Int64, ni.Valid = 0, false
return err
}
ni.Int64, ni.Valid = i.Int64, i.Valid
return nil
}
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// ScanPtr ...
func (ni *NullInt64) ScanPtr(v interface{}) error {
if ip, ok := v.(*int64); ok && ip != nil {
return ni.Scan(*ip)
}
return nil
}
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// Value ...
func (ni *NullInt64) Value() (driver.Value, error) {
if !ni.Valid {
return nil, nil
}
return ni.Int64, nil
}
// MarshalJSON ...
func (ni NullInt64) MarshalJSON() ([]byte, error) {
if ni.Valid {
return json.Marshal(ni.Int64)
}
return json.Marshal(nil)
}
// UnmarshalJSON ...
func (ni *NullInt64) UnmarshalJSON(b []byte) error {
var temp *int64
if err := json.Unmarshal(b, &temp); err != nil {
return err
}
if temp != nil {
ni.Valid = true
ni.Int64 = *temp
} else {
ni.Valid = false
}
return nil
}
// SQLCast ...
func (ni *NullInt64) SQLCast() sql.NullInt64 {
return sql.NullInt64(*ni)
}
// NullFloat64 is a wrapper for sql.NullFloat64 with added JSON (un)marshalling
type NullFloat64 sql.NullFloat64
// Scan ...
func (nf *NullFloat64) Scan(value interface{}) error {
var f sql.NullFloat64
if err := f.Scan(value); err != nil {
nf.Float64, nf.Valid = 0.0, false
return err
}
nf.Float64, nf.Valid = f.Float64, f.Valid
return nil
}
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// ScanPtr ...
func (nf *NullFloat64) ScanPtr(v interface{}) error {
if fp, ok := v.(*float64); ok && fp != nil {
return nf.Scan(*fp)
}
return nil
}
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// Value ...
func (nf *NullFloat64) Value() (driver.Value, error) {
if !nf.Valid {
return nil, nil
}
return nf.Float64, nil
}
// MarshalJSON ...
func (nf NullFloat64) MarshalJSON() ([]byte, error) {
if nf.Valid {
return json.Marshal(nf.Float64)
}
return json.Marshal(nil)
}
// UnmarshalJSON ...
func (nf *NullFloat64) UnmarshalJSON(b []byte) error {
var temp *float64
if err := json.Unmarshal(b, &temp); err != nil {
return err
}
if temp != nil {
nf.Valid = true
nf.Float64 = *temp
} else {
nf.Valid = false
}
return nil
}
// SQLCast ...
func (nf *NullFloat64) SQLCast() sql.NullFloat64 {
return sql.NullFloat64(*nf)
}
// NullTime ...
type NullTime struct {
Time time.Time
Valid bool // Valid is true if Time is not NULL
}
// Scan ...
func (nt *NullTime) Scan(value interface{}) (err error) {
if value == nil {
nt.Time, nt.Valid = time.Time{}, false
return
}
switch v := value.(type) {
case time.Time:
nt.Time, nt.Valid = v, true
return
case []byte:
nt.Time, err = parseDateTime(string(v), time.UTC)
nt.Valid = (err == nil)
return
case string:
nt.Time, err = parseDateTime(v, time.UTC)
nt.Valid = (err == nil)
return
}
nt.Valid = false
return fmt.Errorf("Can't convert %T to time.Time", value)
}
// Value implements the driver Valuer interface.
func (nt NullTime) Value() (driver.Value, error) {
if !nt.Valid {
return nil, nil
}
return nt.Time, nil
}
// MarshalJSON ...
func (nt NullTime) MarshalJSON() ([]byte, error) {
if nt.Valid {
format := nt.Time.Format("2006-01-02 15:04:05")
return json.Marshal(format)
}
return json.Marshal(nil)
}
// UnmarshalJSON ...
func (nt *NullTime) UnmarshalJSON(b []byte) error {
var temp *time.Time
var t1 time.Time
var err error
s1 := string(b)
s2 := s1[1 : len(s1)-1]
if s1 == "null" {
temp = nil
} else {
t1, err = time.Parse("2006-01-02 15:04:05", s2)
if err != nil {
return err
}
temp = &t1
}
if temp != nil {
nt.Valid = true
nt.Time = *temp
} else {
nt.Valid = false
}
return nil
}
func parseDateTime(str string, loc *time.Location) (t time.Time, err error) {
base := "0000-00-00 00:00:00.0000000"
timeFormat := "2006-01-02 15:04:05.999999"
switch len(str) {
case 10, 19, 21, 22, 23, 24, 25, 26: // up to "YYYY-MM-DD HH:MM:SS.MMMMMM"
if str == base[:len(str)] {
return
}
t, err = time.Parse(timeFormat[:len(str)], str)
default:
err = fmt.Errorf("invalid time string: %s", str)
return
}
// Adjust location
if err == nil && loc != time.UTC {
y, mo, d := t.Date()
h, mi, s := t.Clock()
t, err = time.Date(y, mo, d, h, mi, s, t.Nanosecond(), loc), nil
}
return
}
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