Struct ColumnDescription

pub struct ColumnDescription {
    pub name: Vec<SqlChar>,
    pub data_type: DataType,
    pub nullability: Nullability,
}

Describes the type and attributes of a column.

Fields

name: Vec<SqlChar>

Column name. May be empty if unavailable.

data_type: DataType

Type of the column

nullability: Nullability

Indicates whether the column is nullable or not.

Implementations

impl ColumnDescription

pub fn new(name: &str, data_type: DataType, nullability: Nullability) -> Self

In production, an ‘empty’ ColumnDescription is expected to be constructed via the Default trait. It is then filled using crate::ResultSetMetadata::describe_col. When writing test cases however it might be desirable to directly instantiate a ColumnDescription. This constructor enables you to do that, without caring which type SqlChar resolves to.

pub fn name_to_string(&self) -> Result<String, DecodeUtf16Error>

Converts the internal UTF16 representation of the column name into UTF8 and returns the result as a String.

pub fn could_be_nullable(&self) -> bool

true if the column is Nullable or it is not know whether the column is nullable. false if and only if the column is NoNulls.

Trait Implementations

impl Clone for ColumnDescription

fn clone(&self) -> ColumnDescription

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ColumnDescription

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

Formats the value using the given formatter.

impl Default for ColumnDescription

fn default() -> ColumnDescription

Returns the “default value” for a type.

impl PartialEq for ColumnDescription

fn eq(&self, other: &ColumnDescription) -> 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 Eq for ColumnDescription

impl StructuralPartialEq for ColumnDescription