README
¶
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 "". 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.
zero.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.
zero.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.
zero.Float
A nullable float64.
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.
zero.Bool
A nullable bool.
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.
null.String
An even nuller nullable string.
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.
null.Int
An even nuller nullable int64.
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.
null.Float
An even nuller 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
An even nuller nullable float64.
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.
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
Documentation
¶
Overview ¶
Package null contains types that consider zero input and null input as separate values. Types in this package will always encode to their null value if null. Use the zero subpackage if you want empty and null to be treated the same.
Index ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
This section is empty.
Types ¶
type Bool ¶
Bool is an even nuller nullable bool. It does not consider false values to be null. It will decode to null, not false, if null.
func BoolFromPtr ¶
BoolFromPtr creates a new Bool that will be null if f is nil.
func (Bool) IsZero ¶
IsZero returns true for invalid Bools, for future omitempty support (Go 1.4?) A non-null Bool with a 0 value will not be considered zero.
func (Bool) MarshalJSON ¶
MarshalJSON implements json.Marshaler. It will encode null if this Bool is null.
func (Bool) MarshalText ¶
MarshalText implements encoding.TextMarshaler. It will encode a blank string if this Bool is null.
func (Bool) Ptr ¶
Ptr returns a pointer to this Bool's value, or a nil pointer if this Bool is null.
func (*Bool) UnmarshalJSON ¶
UnmarshalJSON implements json.Unmarshaler. It supports number and null input. 0 will not be considered a null Bool. It also supports unmarshalling a sql.NullBool.
func (*Bool) UnmarshalText ¶
UnmarshalText implements encoding.TextUnmarshaler. It will unmarshal to a null Bool if the input is a blank or not an integer. It will return an error if the input is not an integer, blank, or "null".
type Float ¶
type Float struct {
sql.NullFloat64
}
Float is an even nuller nullable float64. It does not consider zero values to be null. It will decode to null, not zero, if null.
func FloatFromPtr ¶
FloatFromPtr creates a new Float that be null if f is nil.
func (Float) IsZero ¶
IsZero returns true for invalid Floats, for future omitempty support (Go 1.4?) A non-null Float with a 0 value will not be considered zero.
func (Float) MarshalJSON ¶
MarshalJSON implements json.Marshaler. It will encode null if this Float is null.
func (Float) MarshalText ¶
MarshalText implements encoding.TextMarshaler. It will encode a blank string if this Float is null.
func (Float) Ptr ¶
Ptr returns a pointer to this Float's value, or a nil pointer if this Float is null.
func (*Float) UnmarshalJSON ¶
UnmarshalJSON implements json.Unmarshaler. It supports number and null input. 0 will not be considered a null Float. It also supports unmarshalling a sql.NullFloat64.
func (*Float) UnmarshalText ¶
UnmarshalText implements encoding.TextUnmarshaler. It will unmarshal to a null Float if the input is a blank or not an integer. It will return an error if the input is not an integer, blank, or "null".
type Int ¶
Int is an even nuller nullable int64. It does not consider zero values to be null. It will decode to null, not zero, if null.
func IntFromPtr ¶
IntFromPtr creates a new Int that be null if i is nil.
func (Int) IsZero ¶
IsZero returns true for invalid Ints, for future omitempty support (Go 1.4?) A non-null Int with a 0 value will not be considered zero.
func (Int) MarshalJSON ¶
MarshalJSON implements json.Marshaler. It will encode null if this Int is null.
func (Int) MarshalText ¶
MarshalText implements encoding.TextMarshaler. It will encode a blank string if this Int is null.
func (*Int) UnmarshalJSON ¶
UnmarshalJSON implements json.Unmarshaler. It supports number and null input. 0 will not be considered a null Int. It also supports unmarshalling a sql.NullInt64.
func (*Int) UnmarshalText ¶
UnmarshalText implements encoding.TextUnmarshaler. It will unmarshal to a null Int if the input is a blank or not an integer. It will return an error if the input is not an integer, blank, or "null".
type String ¶
type String struct {
sql.NullString
}
String is an even nuller nullable string.
func StringFrom ¶
StringFrom creates a new String that will never be blank.
func StringFromPtr ¶
StringFromPtr creates a new String that be null if s is nil.
func (String) IsZero ¶
IsZero returns true for null or empty strings, for future omitempty support. (Go 1.4?) Will return false s if blank but non-null.
func (String) MarshalJSON ¶
MarshalJSON implements json.Marshaler. It will encode null if this String is null.
func (String) Ptr ¶
Ptr returns a pointer to this String's value, or a nil pointer if this String is null.
func (*String) UnmarshalJSON ¶
UnmarshalJSON implements json.Unmarshaler. It supports string and null input. Blank string input produces a null String. It also supports unmarshalling a sql.NullString.
func (*String) UnmarshalText ¶
UnmarshalText implements encoding.TextUnmarshaler. It will unmarshal to a null String if the input is a blank string.
Source Files
Directories