## null-extended [![GoDoc](https://godoc.org/github.com/nullbio/null?status.svg)](https://godoc.org/github.com/nullbio/null) [![Coverage](http://gocover.io/_badge/github.com/nullbio/null)](http://gocover.io/github.com/nullbio/null)
`import "gopkg.in/nullbio/null.v5"`

null-extended is a library with reasonable options for dealing with nullable SQL and JSON values

There are two packages: `null` and its subpackage `zero`.

Types in `null` will only be considered null on null input, and will JSON encode to `null`. If you need zero and null be considered separate values, use these.

Types in `zero` are treated like zero values in Go: blank string input will produce a null `zero.String`, and null Strings will JSON encode to `""`. Zero values of these types will be considered null to SQL. If you need zero and null treated the same, use these.

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`.

### null package

`import "gopkg.in/nullbio/null.v5"`

#### 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.

Will marshal to JSON null if Invalid. []]byte{} input will not produce an Invalid Bytes, but []byte(nil) will. This should be used for storing binary data (bytea in PSQL for example) in the database.

#### null.String
Nullable string.

Marshals to JSON null if SQL source data is null. Zero (blank) input will not produce a null String. Can unmarshal from `sql.NullString` JSON input or string input.

#### null.Bool
Nullable bool.

Marshals to JSON null if SQL source data is null. False input will not produce a null Bool. Can unmarshal from `sql.NullBool` JSON input.

#### null.Time

Marshals to JSON null if SQL source data is null. Uses `time.Time`'s marshaler. Can unmarshal from `pq.NullTime` and similar JSON input.

#### null.Float32
Nullable float32.

Marshals to JSON null if SQL source data is null. Zero input will not produce a null Float32. Can unmarshal from `null.NullFloat32` JSON input.

#### null.Float64
Nullable float64.

Marshals to JSON null if SQL source data is null. Zero input will not produce a null Float64. Can unmarshal from `sql.NullFloat64` JSON input.

#### null.Int
Nullable int.

Marshals to JSON null if SQL source data is null. Zero input will not produce a null Int. Can unmarshal from `null.NullInt` JSON input.

#### null.Int8
Nullable int8.

Marshals to JSON null if SQL source data is null. Zero input will not produce a null Int8. Can unmarshal from `null.NullInt8` JSON input.

#### null.Int16
Nullable int16.

Marshals to JSON null if SQL source data is null. Zero input will not produce a null Int16. Can unmarshal from `null.NullInt16` JSON input.

#### null.Int32
Nullable int32.

Marshals to JSON null if SQL source data is null. Zero input will not produce a null Int32. Can unmarshal from `null.NullInt32` JSON input.

#### null.Int64
Nullable int64.

Marshals to JSON null if SQL source data is null. Zero input will not produce a null Int64. Can unmarshal from `sql.NullInt64` JSON input.

#### null.Uint
Nullable uint.

Marshals to JSON null if SQL source data is null. Zero input will not produce a null Uint. Can unmarshal from `null.NullUint` JSON input.

#### null.Uint8
Nullable uint8.

Marshals to JSON null if SQL source data is null. Zero input will not produce a null Uint8. Can unmarshal from `null.NullUint8` JSON input.

#### null.Uint16
Nullable uint16.

Marshals to JSON null if SQL source data is null. Zero input will not produce a null Uint16. Can unmarshal from `null.NullUint16` JSON input.

#### null.Uint32
Nullable int32.

Marshals to JSON null if SQL source data is null. Zero input will not produce a null Uint32. Can unmarshal from `null.NullUint32` JSON input.

#### null.Int64
Nullable uint64.

Marshals to JSON null if SQL source data is null. Zero input will not produce a null Uint64. Can unmarshal from `null.NullUint64` JSON input.

### zero package

`import "gopkg.in/nullbio/null.v5/zero"`

#### zero.JSON
Nullable []byte.

Will marshal to JSON null if Invalid. []byte{} and []byte(nil) will produce an Invalid JSON. 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.

#### zero.Bytes
Nullable []byte.

Will marshal to JSON null if Invalid. []byte{} and []byte(nil) will produce an Invalid Bytes. This should be used for storing binary data (bytea in PSQL for example) in the database.

#### zero.String
Nullable string.

Will marshal to a blank string if null. Blank string input produces a null String. Null values and zero values are considered equivalent. Can unmarshal from `sql.NullString` JSON input.

#### zero.Bool
Nullable bool.

Will marshal to false if null. `false` produces a null Float. Null values and zero values are considered equivalent. Can unmarshal from `sql.NullBool` JSON input.

#### zero.Time

Will marshal to the zero time if null. Uses `time.Time`'s marshaler. Can unmarshal from `pq.NullTime` and similar JSON input.

#### zero.Float32
Nullable float32.

Will marshal to 0 if null. 0.0 produces a null Float32. Null values and zero values are considered equivalent. Can unmarshal from `zero.NullFloat32` JSON input.

#### zero.Float64
Nullable float64.

Will marshal to 0 if null. 0.0 produces a null Float64. Null values and zero values are considered equivalent. Can unmarshal from `sql.NullFloat64` JSON input.

#### zero.Int
Nullable int.

Will marshal to 0 if null. 0 produces a null Int. Null values and zero values are considered equivalent. Can unmarshal from `zero.NullInt` JSON input.

#### zero.Int8
Nullable int8.

Will marshal to 0 if null. 0 produces a null Int8. Null values and zero values are considered equivalent. Can unmarshal from `zero.NullInt8` JSON input.

#### zero.Int16
Nullable int16.

Will marshal to 0 if null. 0 produces a null Int16. Null values and zero values are considered equivalent. Can unmarshal from `zero.NullInt16` JSON input.

#### zero.Int32
Nullable int32.

Will marshal to 0 if null. 0 produces a null Int32. Null values and zero values are considered equivalent. Can unmarshal from `zero.NullInt32` JSON input.

#### zero.Int64
Nullable int64.

Will marshal to 0 if null. 0 produces a null Int64. Null values and zero values are considered equivalent. Can unmarshal from `sql.NullInt64` JSON input.

#### zero.Uint
Nullable uint.

Will marshal to 0 if null. 0 produces a null Uint. Null values and zero values are considered equivalent. Can unmarshal from `zero.NullUint` JSON input.

#### zero.Uint8
Nullable uint8.

Will marshal to 0 if null. 0 produces a null Uint8. Null values and zero values are considered equivalent. Can unmarshal from `zero.NullUint8` JSON input.

#### zero.Uint16
Nullable uint16.

Will marshal to 0 if null. 0 produces a null Uint16. Null values and zero values are considered equivalent. Can unmarshal from `zero.NullUint16` JSON input.

#### zero.Uint32
Nullable uint32.

Will marshal to 0 if null. 0 produces a null Uint32. Null values and zero values are considered equivalent. Can unmarshal from `zero.NullUint32` JSON input.

#### zero.Uint64
Nullable uint64.

Will marshal to 0 if null. 0 produces a null Uint64. Null values and zero values are considered equivalent. Can unmarshal from `zero.NullUint64` JSON input.

### 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](https://github.com/golang/go/issues/4357).

### License
BSD