Null

Null 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, and json.Unmarshaler. A null object's MarshalText will return a blank string.

Installation:

go get -u github.com/catamat/null

null package:

import "github.com/catamat/null"

null.String

Nullable string.

Marshals to JSON null if SQL source data is null. Zero (blank) input will not produce a null String.

null.Int

Nullable int64.

Marshals to JSON null if SQL source data is null. Zero input will not produce a null Int.

null.Float

Nullable float64.

Marshals to JSON null if SQL source data is null. Zero input will not produce a null Float.

null.Bool

Nullable bool.

Marshals to JSON null if SQL source data is null. False input will not produce a null Bool.

null.Time

Marshals to JSON null if SQL source data is null. Zero input will not produce a null Time.

zero package:

import "github.com/catamat/null/zero"

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.

zero.Int

Nullable int64.

Will marshal to 0 if null. 0 produces a null Int. Null values and zero values are considered equivalent.

zero.Float

Nullable float64.

Will marshal to 0.0 if null. 0.0 produces a null Float. Null values and zero values are considered equivalent.

zero.Bool

Nullable bool.

Will marshal to false if null. false produces a null Float. Null values and zero values are considered equivalent.

zero.Time

Will marshal to the zero time if null. Uses time.Time's marshaler.

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