Struct Column 

pub struct Column {
    pub name: String,
    pub description: Option<String>,
    pub nullable: bool,
    pub data_type: String,
    pub nominal_type: String,
    pub domain_type: Option<String>,
    pub max_len: Option<i32>,
    pub default: Option<String>,
    pub enum_values: Vec<String>,
    pub is_pk: bool,
    pub position: i32,
    pub always_generated: bool,
}

A table column.

Fields

name: String

Column name

description: Option<String>

Description from comment

nullable: bool

Whether NULL is allowed

data_type: String

PostgreSQL data type

nominal_type: String

Base type (for domains)

domain_type: Option<String>

The domain this column is declared over, where it is declared over one.

information_schema reports the type underneath a domain in data_type and udt_name, so nothing else says that a value is a color rather than an integer – and a data representation is declared on the domain.

max_len: Option<i32>

Maximum length (for varchar, etc.)

default: Option<String>

Default value expression

enum_values: Vec<String>

Enum values (for enum types)

is_pk: bool

Whether this is part of the primary key

position: i32

Column position (1-based)

always_generated: bool

Whether PostgreSQL generates this column’s value and refuses any other.

GENERATED ALWAYS AS IDENTITY and GENERATED ALWAYS AS (...) STORED both mean the same thing to a writer: naming the column at all is an error, not merely unnecessary. A BY DEFAULT identity is not this – it has a default and accepts a value – which is why the flag is about what a write may say rather than about how a value is produced.

Implementations

impl Column

pub fn representation_type(&self) -> &str

The type a data representation would be declared on.

The domain where the column has one, and the type itself otherwise.

impl Column

pub fn has_default(&self) -> bool

Check if this column has a default value.

pub fn is_auto(&self) -> bool

Check if this is an auto-generated column.

pub fn is_json(&self) -> bool

Check if this is a JSON/JSONB column.

pub fn is_array(&self) -> bool

Check if this is an array type.

pub fn is_range(&self) -> bool

Check if this is a range type.

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<'de> Deserialize<'de> for Column

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Column

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

where __S: Serializer,

Serialize this value into the given Serde serializer.