Function kdb_c_api::enkey

pub fn enkey(table: K, n: J) -> K

Constructor of q keyed table object.

Parameters

• table: q table object to be enkeyed.
• n: The number of key columns from the left.

Example

use kdb_c_api::*;
 
#[no_mangle]
pub extern "C" fn create_table2(_: K) -> K{
  // Build keys
  let keys=new_simple_list(qtype::SYMBOL, 2);
  let keys_slice=keys.as_mut_slice::<S>();
  keys_slice[0]=internalize(str_to_S!("time"));
  keys_slice[1]=internalize_n(str_to_S!("temperature_and_humidity"), 11);
   
  // Build values
  let values=new_simple_list(qtype::COMPOUND, 2);
  let time=new_simple_list(qtype::TIMESTAMP, 3);
  // 2003.10.10D02:24:19.167018272 2006.05.24D06:16:49.419710368 2008.08.12D23:12:24.018691392
  time.as_mut_slice::<J>().copy_from_slice(&[119067859167018272_i64, 201766609419710368, 271897944018691392]);
  let temperature=new_simple_list(qtype::FLOAT, 3);
  temperature.as_mut_slice::<F>().copy_from_slice(&[22.1_f64, 24.7, 30.5]);
  values.as_mut_slice::<K>().copy_from_slice(&[time, temperature]);
   
  flip(new_dictionary(keys, values))
}
 
#[no_mangle]
pub extern "C" fn create_keyed_table(dummy: K) -> K{
  enkey(create_table2(dummy), 1)
}

q)locker: libc_api_examples 2: (`create_keyed_table; 1);
q)locker[]
time                         | temperature
-----------------------------| -----------
2003.10.10D02:24:19.167018272| 22.1       
2006.05.24D06:16:49.419710368| 24.7       
2008.08.12D23:12:24.018691392| 30.5