trying to get used to sql * more running and creating a simple procedure

Hello all;

I'm getting used to sql * more after using for a while using pl/sql developer.

I am trying to create a simple procedure and run it. See my procedure below
create or replace procedure test(t in varchar2(200), limit in number(30))
begin
select tbl_report.id from tbl_report where tbl_report.id like '|| t ||%' and rownum <= limit;
end test;
and then I type in run hr.test ("J", 10); to run this and then press ENTER, and it does nothing. How can I run and create a simple procedure in sql * more

Hello

In addition to all the good points, others have done:

When you issue a SELECT statement in SQL * Plus (or any other front end) two things happen:
(1) a result set, containing the results of your query, is produced, and
(2) this result set is displayed.
Given that these two things are always done together, it is easy to forget that they are two different things.
In PL/SQL, you must explicitly do something to catch the result set, and you must explicitly do something else to view it (if you want to display it).

A simple way to get the result set is to use a cursor FOR loop, to extract a line at a time and run code with this line in a record variable (called the country in the example below).
View the results is to call dbms_output.put_line.

Here is an example:

CREATE OR REPLACE PROCEDURE     test
(       t       IN      VARCHAR2
,     lmt      IN     NUMBER          -- LIMIT is an Oracle keyword; best not to use it as a variable name
)
IS
BEGIN
    FOR  country  IN ( SELECT  country_name
                      FROM    hr.countries
                 WHERE   country_name     LIKE t || '%'
                 AND     ROWNUM          <= lmt
               )
    LOOP
        dbms_output.put_line (  country.country_name
                    || ' = country_name'
                    );
    END LOOP;
END test;
/
SHOW ERRORS

You can use variables, such as t and lmt, in the query without using dynamic SQL, as long as the variables do not have the same names as the columns in the table. In this case, t and lmt are good names; country_name or region_id wouldn't. (In fact, t is a reputable insofar as it cannot be confused with a column in the table of the country. T is not a good reputation in the sense that it does not give much information about what contains the variable, or how it is used. Why not call the variable target_name or name_a_trouver?

You can run the SQL procedure * more like this:

SET     SERVEROUTPUT     ON

EXEC  test ('I', 2);

If you issue the SET SERVEROUTPUT ON command, then you will not see the output of dbms_output. You must only issue the command SET SERVEROUTPUT ON once per session, but nothing bad happens if you do it more than once.

When I ran the procedure as stated above, I got this output:

Israel = country_name
India = country_name

Notice that "The Italy" does not appear, because lmt has 2.

Do not create your own procedures, tables or other objects in the HR schema, or among all the other patterns created by Oracle. Create your own schema and create procedures and other objects in it.

Tags: Database

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