2 KiB
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 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.String
A nullable string.
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