Struct rustdb::table::ColInfo

#[non_exhaustive]
pub struct ColInfo {
    pub name: ObjRef,
    pub colmap: BTreeMap<String, usize>,
    pub colnames: Vec<String>,
    pub typ: Vec<DataType>,
    pub off: Vec<usize>,
    pub total: usize,
}

Table name, column names/types and other calculated values for a table.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

name: ObjRef

Table name.

colmap: BTreeMap<String, usize>

Map from column name to column number.

colnames: Vec<String>

Column names.

typ: Vec<DataType>

Column types.

off: Vec<usize>

Column offsets.

total: usize

Total data size, including Id.

Implementations

impl ColInfo

pub fn empty(name: ObjRef) -> Self

Construct an empty ColInfo struct with no columns.

pub fn new(name: ObjRef, ct: &[(&str, DataType)]) -> Self

Construct a new ColInfo struct using supplied list of column names and types.

pub fn add(&mut self, name: String, typ: DataType) -> bool

Add a column. If the column already exists ( an error ) the result is true.

pub fn get(&self, name: &str) -> Option<&usize>

Get a column number from a column name. usize::MAX is returned for “Id”.