58 lines
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2.9 KiB
Markdown
58 lines
No EOL
2.9 KiB
Markdown
## null [](https://godoc.org/github.com/guregu/null) [](http://gocover.io/github.com/guregu/null)
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`import "gopkg.in/guregu/null.v2"`
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null is a library with reasonable options for dealing with nullable SQL and JSON values
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There are two packages: `null` and its subpackage `zero`.
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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.
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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 `""`. If you need zero and null treated the same, use these.
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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`.
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#### zero.String
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A nullable string.
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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.
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#### zero.Int
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A nullable int64.
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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.
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#### zero.Float
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A nullable float64.
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Will marshal to 0 if null. Blank string or 0 input produces a null Float. In other words, null values and empty values are considered equivalent. Can unmarshal from `sql.NullFloat64` JSON input.
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#### zero.Bool
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A nullable bool.
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Will marshal to false if null. Blank string or false input produces a null Float. In other words, null values and empty values are considered equivalent. Can unmarshal from `sql.NullBool` JSON input.
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#### null.String
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An even nuller nullable string.
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Unlike `zero.String`, `null.String` will marshal to null if null. Zero (blank) input will not produce a null String. Can unmarshal from `sql.NullString` JSON input.
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#### null.Int
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An even nuller nullable int64.
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Unlike `zero.Int`, `null.Int` will marshal to null if null. Zero input will not produce a null Int. Can unmarshal from `sql.NullInt64` JSON input.
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#### null.Float
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An even nuller nullable float64.
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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.
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#### null.Bool
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An even nuller nullable float64.
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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.
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### Bugs
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`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](https://code.google.com/p/go/issues/detail?id=4357).
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### License
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BSD |