Struct BaseMetaDataColumn 

pub struct BaseMetaDataColumn {
    pub flags: BitFlags<ColumnFlag>,
    pub ty: TypeInfo,
    pub table_name: Option<String>,
}

Describes the type and flags of a column, exposing metadata such as the column type (including size, precision and scale), whether the column is nullable and whether it is an identity column.

Fields

flags: BitFlags<ColumnFlag>

The set of ColumnFlags describing the column (nullability, identity, updateability, and so on).

ty: TypeInfo

The type of the column, including its size, precision and scale where applicable.

table_name: Option<String>

Destination table name, used only on the encode (bulk-load) path. Per MS-TDS §2.2.7.4, text/ntext/image columns carry a TableName element in COLMETADATA; the bulk-insert code sets this to the target table so BaseMetaDataColumn::encode can emit it. It is always None on the decode (server→client) path, which never needs it.

Implementations

impl BaseMetaDataColumn

pub fn ty(&self) -> &TypeInfo

The type of the column, including its size, precision and scale where applicable.

pub fn flags(&self) -> BitFlags<ColumnFlag>

The set of flags describing the column.

pub fn is_nullable(&self) -> bool

true if the column accepts NULL values.

pub fn is_identity(&self) -> bool

true if the column is an identity column.

pub fn is_updateable(&self) -> bool

true if the column is writeable (e.g. usable as a bulk-insert target).

The COLMETADATA usUpdateable sub-field (MS-TDS §2.2.7.4) is one of read-only (0), read/write (1), or unknown (2). SQL Server reports unknown for many legitimate bulk-target columns rather than an explicit read/write, so both read/write and unknown are treated as writeable here; only an explicit read-only column (neither flag set) is excluded.

Trait Implementations

impl Clone for BaseMetaDataColumn

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for BaseMetaDataColumn

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

Formats the value using the given formatter.