null

import "gopkg.in/guregu/null.v2"

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.

null package

import "gopkg.in/guregu/null.v2"

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.Int

Nullable int64.

Marshals to JSON null if SQL null. Zero input will not produce a null Int. Can unmarshal from sql.NullInt64 JSON input.

null.Float

Nullable float64.

Unlike zero.Float, null.Float will marshal to null if null. Zero input will not produce a null Float. Can unmarshal from sql.NullFloat64 JSON input.

null.Bool

Nullable bool.

Unlike zero.Bool, null.Bool will marshal to null if null. False input will not produce a null Bool. Can unmarshal from sql.NullBool JSON input.

zero package

import "gopkg.in/guregu/null.v2/zero"

zero.String

Nullable int64.

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.Int

Nullable int64.

Will marshal to 0 if null. Blank string or 0 input produces a null Int. Null values and zero values are considered equivalent. Can unmarshal from sql.NullInt64 JSON input.

zero.Float

Nullable float64.

Will marshal to 0 if null. Blank string or 0 input produces a null Float. Null values and zero values are considered equivalent. Can unmarshal from sql.NullFloat64 JSON input.

zero.Bool

Nullable bool.

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

License

BSD