Struct rustdb::table::ColInfo

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

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 add_altered(
    &mut self,
    ci: &ColInfo,
    cnum: usize,
    actions: &[AlterCol]
) -> bool

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

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