Struct ColMetaData 

pub struct ColMetaData {
    pub columns: Vec<ColumnData>,
    pub cek_table: Option<CekTable>,
}

Column metadata token.

Fields

columns: Vec<ColumnData>

Column definitions.

cek_table: Option<CekTable>

CEK table for Always Encrypted result sets. Present only when the server sends encrypted column metadata.

Implementations

impl ColMetaData

pub const NO_METADATA: u16 = 0xFFFF

Special value indicating no metadata.

pub fn decode(src: &mut impl Buf) -> Result<Self, ProtocolError>

Decode a COLMETADATA token from bytes.

pub fn decode_encrypted(src: &mut impl Buf) -> Result<Self, ProtocolError>

Decode a COLMETADATA token with Always Encrypted support.

When column encryption was negotiated in Login7, the server sends a CekTable before column definitions and per-column CryptoMetadata for encrypted columns.

Wire Format (with encryption)

column_count: USHORT
cek_table: CekTable (always present when encryption negotiated)
columns: ColumnData[column_count] (with CryptoMetadata for encrypted columns)

pub fn column_count(&self) -> usize

Get the number of columns.

pub fn is_empty(&self) -> bool

Check if this represents no metadata.

Trait Implementations

impl Clone for ColMetaData

fn clone(&self) -> ColMetaData

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ColMetaData

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

Formats the value using the given formatter.

impl Default for ColMetaData

fn default() -> ColMetaData

Returns the “default value” for a type.