I have an existing Customers table and want to output each row from this table using a stored procedure. There is no input criteria, just need to output all of the records.
The stored procedure should basically be equivalent to:
"SELECT C_ID, LAST, FIRST, DOB, DPHONE, EMAIL FROM customers;"
This seems simple but I can't figure it out. All my searches haven't worked out for this case.
How would one accomplish this?
EDIT: Answered my question below. Very simple.
In Oracle your options are:
1. Use a function and return a REF CURSOR
2. Use a procedure and use a REF CURSOR as an OUT parameter
3. Use a PIPELINED function
4. Use a function and return a collection.
read this documentation
Overview of Table Functions
see similar question here Return collection from packaged function for use in select
simple sample of such function
CREATE FUNCTION StockPivot(p refcur_pkg.refcur_t) RETURN TickerTypeSet
PIPELINED IS
out_rec TickerType := TickerType(NULL,NULL,NULL);
in_rec p%ROWTYPE;
BEGIN
LOOP
FETCH p INTO in_rec;
EXIT WHEN p%NOTFOUND;
-- first row
out_rec.ticker := in_rec.Ticker;
out_rec.PriceType := 'O';
out_rec.price := in_rec.OpenPrice;
PIPE ROW(out_rec);
-- second row
out_rec.PriceType := 'C';
out_rec.Price := in_rec.ClosePrice;
PIPE ROW(out_rec);
END LOOP;
CLOSE p;
RETURN;
END;
/
Nevermind! Just got it. It is pretty simple. I just did this:
CREATE OR REPLACE PROCEDURE CustomerReport AS
BEGIN
FOR cus IN (SELECT C_ID, LAST, FIRST, DOB, DPHONE, EMAIL FROM customers)
LOOP
dbms_output.put_line(cus.C_ID||' '||cus.FIRST||' '||cus.LAST||' '||cus.DOB||' '||cus.DPHONE||' '||cus.EMAIL);
END LOOP;
END;
Related
I want to create a function that takes some code as an input (e.g. Select * FROM SOME_TABLE) and returns the result of a query as an output.
I want to use it in procedures in order to return tables as a result.
It should look like this:
BEGIN
--some procedure code
CREATE TABLE SOME_TABLE as Select * FROM ...;
Select * FROM table(my_function('Select * FROM SOME_TABLE'));
END;
Important tips:
The resulting table can have multiple columns, from 1 to +inft
The resulting table can have multiple rows, from 1 to +inft
So the size of a table can be both very small or very large.
The input query can have several where, having, partition, and other Oracle constructions.
I want to have a table as an output, not DBMS_OUTPUT.
I can't install any modules/applications, or use other languages hints. However, I can manually create types, functions, procedures.
I tried to search in the net but could not find a solution that meets all my expectations. The best link I've found was this:
https://sqljana.wordpress.com/2017/01/22/oracle-return-select-statement-results-like-sql-server-sps-using-pipelined-functions/
DBMS_SQL.RETURN_RESULT works if your "code" is a select query
DECLARE
l_cur SYS_REFCURSOR;
l_query VARCHAR2(4000) := 'select * from SOME_TABLE';
BEGIN
OPEN l_cur for l_query;
DBMS_SQL.RETURN_RESULT(l_cur);
END;
/
you can create a function that has a string as parameter and return a cursor.
select statement you should pass as a string. in a function you can open a Cursor.
declare
v_sql varchar2(100) := 'select 1,2,3,4,5 from dual';
cur_ref SYS_REFCURSOR;
function get_data(in_sql in varchar2) return SYS_REFCURSOR
as
cur_ret SYS_REFCURSOR;
begin
OPEN cur_ret FOR in_sql;
return cur_ret;
end;
begin
:cur_ref := get_data(v_sql);
end ;
if your select statement is longer than 32K than you maybe should use a clob instead of varchar2 for your Parameter type. But you have to try that
table :
create table emp
(
E_ID number,
E_NAME varchar2(30)
);
select * from emp;
101 name1
102 name2
My code:
declare
v1 varchar2(30) := '101,102';
begin
for i in (select e_id,e_name
from emp
where e_id in (v1)) loop
dbms_output.put_line(i.e_id);
end loop;
end;
/
ISSUE:
Getting ORA -01722:invalid number
Please help to understand this issue and suggest me the solution.
It is syntax error.
E_ID is of number type and you are comparing it will v1 which is varchar2 type.
Welcome to SO. A great place to ask questions: I can see what you're trying to do. Syntactically, you'd be forgiven for trying to query your table using the "IN" clause, but as others have said, this can not be done where you have committed your numeric values into a varchar2. In anycase, an array or a collection, (even if you had created one) it isn't an easy option here. But you do have a variety of solutions open to you:
1/ Place your numbers into an Array and use a condition in your loop and check that e_id forms part of the your array. But in-elegant!
2/ Create a global temporary table and add your numbers in and add the table into your query, specify a join.
3/ Create some dynamic PL/SQL using a Ref Cursor. I've included an example for you below, using your table (emp) and values. In this case, you'd be able to build up your string according to the values you want to query. See below. The varchar2 string: sqlString can be manipulated however you want. Paste into a test-harness and see. Hope it helps
declare
type refCursor is ref cursor;
tableCursor refCursor;
emp_record emp%rowtype;
sqlString varchar2(200);
begin
-- Dynamic SQL statement with placeholder:
sqlString := 'SELECT * FROM emp WHERE e_id in
(101, 102)';
-- Open cursor:
open tableCursor for sqlString;
-- Fetch rows from result set one at a time:
loop
fetch tableCursor
into emp;
exit when tableCursor%notfound;
dbms_output.put_line(emp.e_id);
end loop;
-- Close cursor:
close tableCursor;
end;
Does anyone know how to use their tables and columns from pre-existing databases in a pl/sql command. I am using something from Oracles webpage to use as an example.
SQL> declare
2 v_line varchar2(40):= '&v_string';
3 begin
4 v_line := 'Hello '||v_line;
5 dbms_output.put_line (v_line);
6 end;
7 /
old 2: v_line varchar2(40):= '&v_string';
New 2: v_line varchar2(40):= 'Thomas';
Hello Thomas
PL/SQL procedure successfully completed.
I am wanting to be able to manipulate the data from above. Lets say I have a table called name_s and I have columns called n_first and n_last and I want to use those columns to output 'Hello Thomas' but using those tables.
I am new to pl.sql and trying to learn the syntax.
I wasn't sure if you could,
DECLARE
n_first
n_last
BEGIN
SELECT * FROM name_s
n_fisrt := 'Thomas'||n_first;
dbms_output.put_line(n_first)
END;
/
Desired Output: 'Thomas'
I understand that this is not syntactically correct but I am just trying to pick up on how you can use data from your existing tables to get this sort of desired output
EDIT: The above table is hypothetical and only contains two columns for this example. Now using real tables and data.
SET SERVEROUTPUT ON;
begin
for cur_r in (select loc_t from loc_t_matrix where store_s in(1,2,3,4,5); loop
dbms_output.put_line('Hello store' || cur_r.loc_traits );
end loop;
end;
/
The above does not compile
Do you need something like this
declare
v_authName author.author_last_name%type;
begin
select
author_last_name into v_authName
from
author
where
author_key = 'A103';
dbms_output.put_line('Name: '||v_authName);
end;
/
Name: weaton
http://www.dba-oracle.com/t_pl_sql_plsql_select_into_clause.htm
As tables usually contain more than one row, I presume that NAME_S also contains several rows. In that case, the simplest option to display those names is a cursor FOR loop (Google for it). For example:
begin
for cur_r in (select n_first, n_last from name_s) loop
dbms_output.put_line('Hello ' || cur_r.n_first ||' '||cur_r.n_last);
end loop;
end;
/
As you can see, you don't need local variables in that case.
If you used your SELECT ... INTO (as suggested by mCeviker), that would work unless it raises TOO-MANY-ROWS (as you can't put all rows' names into a single variable).
I have this table :
| Pattern |
----------------------
|category |varchar|
|patternexpr |varchar|
For example in this table I can have a category ISBN and its pattern to recognize it.
I want to create a procedure which takes three arguments : a table T, one of its column C and a category. I want to print every rows in column C in T table which respect the pattern associated.
This is what I did (Updated with the correct answer):
CREATE OR REPLACE PROCEDURE Recognize(T varchar,C varchar,catego varchar)
IS
v_patt Pattern.CATEGOR%Type;
BEGIN
SELECT patternexpr INTO v_patt
FROM Pattern WHERE CATEGOR=catego;
FOR myrow IN (SELECT C FROM T WHERE REGEXP_LIKE(C, v_patt) LOOP
dbms_output.put_line(myrow.C);
END LOOP;
END;
/
How can I declare a cursor to print my result without knowing the value of my variable patt in the "DECLARE" place ? Should I add another declare and begin...end bloc after the first query ? What is the best way to do it ?
(I'm working on Oracle SGBD)
Use REF CURSOR to fetch records for this purpose.
CREATE OR REPLACE PROCEDURE Recognize(
T VARCHAR2,
C VARCHAR2,
catego VARCHAR2)
IS
v_patt Pattern.CATEGOR%Type;
v_cur_txt VARCHAR2(400);
TYPE cur_type
IS
REF
CURSOR;
v_cur cur_type;
v_c VARCHAR2(20);
BEGIN
SELECT patternexpr INTO v_patt FROM Pattern WHERE CATEGOR=catego;
v_cur_txt := 'SELECT '||C||' FROM '|| T ||' WHERE REGEXP_LIKE('||C||', '''||v_patt||''')';
OPEN v_cur FOR v_cur_txt;
LOOP
FETCH v_cur INTO v_c;
EXIT
WHEN v_cur%NOTFOUND;
DBMS_OUTPUT.PUT_LINE(v_c);
END LOOP;
CLOSE v_cur;
END;
/
NOTE: : Include proper EXCEPTION handling in your code for NO_DATA_FOUND etc.Also as per Nicholas , make some validations by using dbms_assert package
In Oracle, you don't need an explicit cursor:
for myrow in (select c from t where regexp_like(c, patt) loop
dbms_output.put_line(myrow.c);
end loop;
I would call the pattern variable something like v_patt; that way, declared variables don't get confused with column names.
I am working on PL/SQL code where I need to perform a select query using variable as column name in where clause. Column names are stored in a table as varchar and I am using a loop to pass those column names to my select statement.
Please find sample code segment I am trying to run:
set serveroutput on;
declare
var varchar2(100);
counter number;
begin
var:='description';
select count(*)
into counter
from nodetable
where var like '%Ship%';
dbms_output.put_line(counter);
end;
Output:
anonymous block completed
0
However the result should be 86.
Oracle is comparing last condition as two string and not column=string.
Please let me know if this is even feasible in oracle or if there is a workaround for it.
Regards
Ankit
You have to use dynamic SQL, preferrably with bind-variables:
EXECUTE IMMEDIATE
'select count(*) from nodetable where '||var||' like :p1'
INTO counter
USING '%Ship%';
Try this
declare
var varchar2(100);
counter number;
begin
var:='description';
EXECUTE IMMEDIATE
'select count(*)
into counter
from nodetable
where '||var||' like ''%Ship%'' ';
dbms_output.put_line(counter);
end;
You need to be carefull with the colon's (').
I agreed with previous answer in implementation, but i strictly recommend you to change your technical requirements, because you can't use bind variables for this, and it's potential place for injection. For example, if someone will edit value in your table which stores column names, to something like that: "description = inject_function or description". Then your dynamic sql block will execute this statement:
select count(*) from nodetable where description = inject_function or description like '%Ship%
and example implementation of function
create function inject_function
return varchar2
is pragma autonomous_transaction;
begin
delete * from most_important_table;
commit;
return to_char(null);
exception when others then
rollback;
return to_char(null);
end;