达梦数据库中提供了LAST_INSERT_ID函数，可以获取插入的自增列的值，因此可以自行封装个函数，将查询到的LAST_INSERT_ID结果返回，代码如下
DPIRETURN dm_insert_id()
{
  ulength       row_num; 
  sdint2       c1 = 0;   
  slength    c1_ind = 0; 
  rt = dpi_alloc_stmt(hcon, &hstmt);
  DPIRETURN_CHECK(rt,DSQL_HANDLE_DBC,hcon);
   
  rt = dpi_exec_direct(hstmt, "select LAST_INSERT_ID from dual;");
  DPIRETURN_CHECK(rt,DSQL_HANDLE_STMT,hstmt);
    
  DPIRETURN_CHECK(dpi_bind_col(hstmt, 1, DSQL_C_UBIGINT, &c1, sizeof(c1), &c1_ind), DSQL_HANDLE_STMT, hstmt);
    
  rt=dpi_fetch(hstmt, &row_num) ;
  DPIRETURN_CHECK(rt,DSQL_HANDLE_STMT,hstmt);
  //释放语句句柄
  rt = dpi_free_stmt(hstmt);
  DPIRETURN_CHECK(rt,DSQL_HANDLE_STMT,hstmt);    
  printf("dm insert id success\n");
  return c1;