Struct DdColumn 

pub struct DdColumn {

    pub name: String,
    pub dd_type: u64,
    pub column_type_utf8: String,
    pub ordinal_position: u64,
    pub hidden: u64,
    pub is_nullable: bool,
    pub is_unsigned: bool,
    pub is_auto_increment: bool,
    pub is_virtual: bool,
    pub char_length: u64,
    pub numeric_precision: u64,
    pub numeric_scale: u64,
    pub datetime_precision: u64,
    pub collation_id: u64,
    pub default_value_utf8: String,
    pub default_value_utf8_null: bool,
    pub has_no_default: bool,
    pub default_option: String,
    pub update_option: String,
    pub generation_expression: String,
    pub generation_expression_utf8: String,
    pub elements: Vec<DdColumnElement>,
    pub comment: String,
    pub is_zerofill: bool,
    pub se_private_data: Option<String>,
}

Data dictionary column definition.

Fields

name: String

Column name.

dd_type: u64

dd_type code (internal MySQL type enumeration).

column_type_utf8: String

SQL type string from MySQL (e.g., “varchar(255)”, “int unsigned”).

ordinal_position: u64

Position in the column list (1-based).

hidden: u64

Hidden flag: 1=visible, 2=SE-hidden (DB_TRX_ID, DB_ROLL_PTR, DB_ROW_ID), 3=SQL-hidden (functional index backing columns), 4=user INVISIBLE (MySQL 8.0.23+).

is_nullable: bool

Whether the column allows NULL.

is_unsigned: bool

Whether the column is unsigned.

is_auto_increment: bool

Whether the column is AUTO_INCREMENT.

is_virtual: bool

Whether the column is virtual (generated).

char_length: u64

Character length.

numeric_precision: u64

Numeric precision.

numeric_scale: u64

Numeric scale.

datetime_precision: u64

Datetime fractional seconds precision.

collation_id: u64

Collation ID for this column.

default_value_utf8: String

Default value as UTF-8 string.

default_value_utf8_null: bool

Whether default_value_utf8 is NULL.

has_no_default: bool

Whether the column has no default.

default_option: String

Default option (e.g., “CURRENT_TIMESTAMP”).

update_option: String

Update option (e.g., “CURRENT_TIMESTAMP”).

generation_expression: String

Generation expression (raw).

generation_expression_utf8: String

Generation expression as UTF-8.

elements: Vec<DdColumnElement>

ENUM/SET value elements.

comment: String

Column comment.

is_zerofill: bool

Whether the column is zerofill.

se_private_data: Option<String>

Storage engine private data (e.g., “version_added=1;physical_pos=5;”).

Trait Implementations

impl Debug for DdColumn

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

Formats the value using the given formatter.

impl Default for DdColumn

fn default() -> DdColumn

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for DdColumn

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.