Struct Column 

pub struct Column {
    pub name: String,
    pub declared_type: String,
    pub column_type: Option<ColumnType>,
    pub not_null: bool,
    pub default_value: Option<String>,
    pub primary_key: u32,
    pub data_column: Option<DataColumn>,
}

Metadata for one column of a user table, from PRAGMA table_info.

Fields

name: String

Column name.

declared_type: String

The declared type exactly as stored in the schema (e.g. "TEXT(64)", "VARCHAR(20)", or the empty string for a column declared without a type). Preserved verbatim even when it is outside the spec vocabulary.

column_type: Option<ColumnType>

The declared type parsed into the spec vocabulary, or None when Column::declared_type is outside it (lenient readers keep the raw string).

not_null: bool

Whether the column has a NOT NULL constraint.

default_value: Option<String>

The column default as SQL source text, or None for no default.

primary_key: u32

Position of the column within the primary key: 0 if it is not part of the key, otherwise its 1-based position. SQLite reports a composite key as 1, 2, …; a conformant GeoPackage feature or attribute table has a single INTEGER primary key column reported as 1.

data_column: Option<DataColumn>

The column’s gpkg_data_columns row, for a file with the gpkg_schema extension: a human-readable name and title, a description, a MIME type, and the name of any constraint its values are subject to.

None for a file without the extension, or a column it does not describe. Resolve DataColumn::constraint_name with GeoPackage::column_constraint.

Implementations

impl Column

pub fn is_primary_key(&self) -> bool

Returns true if this column participates in the table’s primary key.

Trait Implementations

impl Clone for Column

fn clone(&self) -> Column

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Column

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

Formats the value using the given formatter.

impl PartialEq for Column

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Column