null

null is a library with opinions on how to deal with nullable SQL and JSON values

There are two packages, null, and nuller.

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

Types in nuller 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.

All types implement sql.Scanner, so you can use this library in place of sql.NullXXX.

null.String

A nullable string. Implements sql.Scanner, encoding.Marshaler and encoding.TextUnmarshaler, providing support for JSON and XML.

Will marshal to a blank string if null. Blank string input produces a null String. In other words, null values and empty values are considered equivalent. Can unmarshal from sql.NullString JSON input.

null.Int

A nullable int64.

Will marshal to 0 if null. Blank string or 0 input produces a null Int. In other words, null values and empty values are considered equivalent. Can unmarshal from sql.NullInt64 JSON input.

nuller.String

An even nuller nullable string.

Unlike null.String, nuller.String will marshal to null if null. Zero (blank) input will not produce a null String. Can unmarshal from sql.NullString JSON input.

nuller.Int

An even nuller nullable int64.

Unlike null.Int, nuller.Int will marshal to null if null. Zero input will not produce a null Int. Can unmarshal from sql.NullInt64 JSON input.

Bugs

json's ",omitempty" struct tag does not work correctly right now. It will never omit a null or empty String. This should be fixed in Go 1.4.

License

BSD