public void Split__trg__nth__rls(Split_ctx ctx, Db_conn trg_conn) {
// make rndm_rng and add
Rndm_rng_itm rng_itm = bldr.Exec_rng_end_or_null();
if (rng_itm == null) return;
Rndm_rng_tbl rng_tbl = new Rndm_rng_tbl(trg_conn);
rng_tbl.Create_tbl();
Db_stmt rng_stmt = rng_tbl.Insert_stmt();
rng_tbl.Insert(
rng_stmt, rng_itm.Mgr_idx(), rng_itm.Rng_idx(), rng_itm.Seq_bgn(), rng_itm.Seq_end());
rng_stmt.Rls();
bldr.Conn().Txn_end();
// make rndm_seq and bulk copy
Rndm_seq_tbl seq_tbl = new Rndm_seq_tbl(trg_conn);
seq_tbl.Create_tbl();
Split_tbl_.Bld_insert_by_select(tmp_bfr, seq_tbl.Tbl_name(), seq_tbl.Flds());
tmp_bfr.Add_str_u8_fmt(
"WHERE {0} = {1} AND {2} = {3}",
seq_tbl.Fld__qry_idx(), bldr.Qry_idx(), seq_tbl.Fld__rng_idx(), bldr.Rng_idx());
attach_mgr.Conn_main_(trg_conn).Conn_links_(new Db_attach_itm("src_db", bldr.Conn()));
attach_mgr.Exec_sql(tmp_bfr.To_str_and_clear());
// bldr.Conn().Txn_bgn("rndm");
}
public Rndm_rng_itm Exec_rng_end_or_null() {
if (seq_in_rng == 0) return null; // no sequences added; return null;
Rndm_rng_itm rv = new Rndm_rng_itm(qry_idx, rng_idx, rng_seq_bgn, seq_in_qry);
rng_tbl.Insert(rng_stmt, qry_idx, rng_idx, rng_seq_bgn, seq_in_qry);
return rv;
}