76 lines
3.1 KiB
Markdown
76 lines
3.1 KiB
Markdown
## null [](https://godoc.org/github.com/guregu/null) [](https://circleci.com/gh/guregu/null)
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`import "gopkg.in/guregu/null.v3"`
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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 `""`. Zero values of these types will be considered null to SQL. 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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### null package
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`import "gopkg.in/guregu/null.v3"`
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#### null.String
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Nullable string.
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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.
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#### null.Int
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Nullable int64.
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Marshals to JSON null if SQL source data is 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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Nullable float64.
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Marshals to JSON null if SQL source data is 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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Nullable bool.
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Marshals to JSON null if SQL source data is null. False input will not produce a null Bool. Can unmarshal from `sql.NullBool` JSON input.
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#### null.Time
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Marshals to JSON null if SQL source data is null. Uses `time.Time`'s marshaler. Can unmarshal from `pq.NullTime` and similar JSON input.
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### zero package
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`import "gopkg.in/guregu/null.v3/zero"`
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#### zero.String
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Nullable string.
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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.
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#### zero.Int
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Nullable int64.
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Will marshal to 0 if null. 0 produces a null Int. Null values and zero values are considered equivalent. Can unmarshal from `sql.NullInt64` JSON input.
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#### zero.Float
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Nullable float64.
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Will marshal to 0 if null. 0.0 produces a null Float. Null values and zero values are considered equivalent. Can unmarshal from `sql.NullFloat64` JSON input.
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#### zero.Bool
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Nullable bool.
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Will marshal to false if null. `false` produces a null Float. Null values and zero values are considered equivalent. Can unmarshal from `sql.NullBool` JSON input.
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#### zero.Time
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Will marshal to the zero time if null. Uses `time.Time`'s marshaler. Can unmarshal from `pq.NullTime` and similar 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 might be [fixed eventually](https://github.com/golang/go/issues/11939).
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### License
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BSD
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