null 
null is a library with reasonable options for dealing with nullable SQL and
JSON values.
Types in null will only be considered null on null input, and will JSON
encode to null.
All types implement sql.Scanner and driver.Valuer, so you can use this
library in place of sql.NullXXX. All types also implement:
encoding.TextMarshaler, encoding.TextUnmarshaler, json.Marshaler,
json.Unmarshaler and sql.Scanner.
Installation
go get github.com/sisoftrg/null
Usage
The following are all types supported in this package. All types will marshal to JSON null if Invalid or SQL source data is null.
| Type | Description | Notes |
|---|---|---|
null.JSON |
Nullable []byte |
Will marshal to JSON null if Invalid. []byte{} input will not produce an Invalid JSON, but []byte(nil) will. This should be used for storing raw JSON in the database. Also has null.JSON.Marshal and null.JSON.Unmarshal helpers to marshal and unmarshal foreign objects. |
null.Bytes |
Nullable []byte |
[]byte{} input will not produce an Invalid Bytes, but []byte(nil) will. This should be used for storing binary data (bytes in PSQL for example) in the database. |
null.String |
Nullable string |
|
null.Byte |
Nullable byte |
|
null.Bool |
Nullable bool |
|
null.Time |
Nullable `time.Time | Marshals to JSON null if SQL source data is null. Uses time.Time's marshaler. |
null.Float32 |
Nullable float32 |
|
null.Float64 |
Nullable float64 |
|
null.Int |
Nullable int |
|
null.Int8 |
Nullable int8 |
|
null.Int16 |
Nullable int16 |
|
null.Int32 |
Nullable int32 |
|
null.Int64 |
Nullable int64 |
|
null.Uint |
Nullable uint |
|
null.Uint8 |
Nullable uint8 |
|
null.Uint16 |
Nullable uint16 |
|
null.Uint32 |
Nullable uint32 |
|
null.Uint64 |
Nullable uint64 |
Bugs
json's ",omitempty" struct tag does not work correctly right now. It will
never omit a null or empty String. This might be fixed
eventually.
License
BSD-3 (See License file)