Struct NullString 

pub struct NullString {
    pub string: Option<String>,
    pub valid: Option<bool>,
}

NullString : var s NullString err := db.QueryRow("SELECT name FROM foo WHERE id=?", id).Scan(&s) … if s.Valid { use s.String } else { NULL value }

Fields

string: Option<String>

valid: Option<bool>

Implementations

impl NullString

pub fn new() -> NullString

var s NullString err := db.QueryRow("SELECT name FROM foo WHERE id=?", id).Scan(&s) … if s.Valid { use s.String } else { NULL value }

Trait Implementations

impl Clone for NullString

fn clone(&self) -> NullString

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for NullString

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for NullString

fn default() -> NullString

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for NullString

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for NullString

fn eq(&self, other: &NullString) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for NullString

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for NullString