Crystal Report calls Oracle stored procedures

Source: Network/Editor: getting started with programming: Unknown

The crystal report version is 8.5

The stored procedure is:

create or replace package pkg_test4
as
type v_cursor is ref cursor;
end pkg_test4;
/
create or replace procedure pro_test4
(P_CURSOR in out pkg_test4.v_cursor)
as
sqlstr varchar2(3000);
begin
sqlstr :='select table_name from user_tables';
open p_cursor for sqlstr;
end pro_test4;
/

The crystal report is released to a Java application.

Problem:

1. How can I define a stored procedure only when multiple records are returned?

2. How to test the stored procedure in sqlplus?

3. can I access this stored procedure in a crystal report, but cannot generate a report after it is released?