class DuckDB::Column - RDoc Documentation

Source

VALUE duckdb_column__logical_type(VALUE oDuckDBColumn) {
    rubyDuckDBColumn *ctx;
    rubyDuckDBResult *ctxresult;
    VALUE result;
    duckdb_logical_type _logical_type;
    VALUE logical_type = Qnil;

    TypedData_Get_Struct(oDuckDBColumn, rubyDuckDBColumn, &column_data_type, ctx);

    result = rb_ivar_get(oDuckDBColumn, rb_intern("result"));
    ctxresult = get_struct_result(result);
    _logical_type = duckdb_column_logical_type(&(ctxresult->result), ctx->col);

    if (_logical_type) {
        logical_type = rbduckdb_create_logical_type(_logical_type);
    }

    return logical_type;
}

Returns the logical type class.

name → string.

Source

VALUE duckdb_column_get_name(VALUE oDuckDBColumn) {
    rubyDuckDBColumn *ctx;
    VALUE result;
    rubyDuckDBResult *ctxresult;

    TypedData_Get_Struct(oDuckDBColumn, rubyDuckDBColumn, &column_data_type, ctx);

    result = rb_ivar_get(oDuckDBColumn, rb_intern("result"));

    ctxresult = get_struct_result(result);

    return rb_utf8_str_new_cstr(duckdb_column_name(&(ctxresult->result), ctx->col));
}

Returns the column name.

type ()

Source

# File lib/duckdb/column.rb, line 17
def type
  type_id = _type
  DuckDB::Converter::IntToSym.type_to_sym(type_id)
end

returns column type symbol ‘:unknown` means that the column type is unknown/unsupported by ruby-duckdb. `:invalid` means that the column type is invalid in duckdb.

require 'duckdb'
db = DuckDB::Database.open
con = db.connect
con.query('CREATE TABLE users (id INTEGER, name VARCHAR(30))')

users = con.query('SELECT * FROM users')
columns = users.columns
columns.first.type #=> :integer