can someone help with that.
I need to check against a column say, "COL_A" that if its not null and is numeric (10,0).
Need to check and find the rows that are not null and are numeric (10,0).
Please help
You should create a function to validate the number and use a NVL function to Null validation:
Code To function:
CREATE OR REPLACE FUNCTION isNumeric(strVal IN VARCHAR2)
RETURN VARCHAR2 DETERMINISTIC PARALLEL_ENABLE
IS
numericVal NUMBER;
BEGIN
numericVal := to_number(strVal);
RETURN 'True';
EXCEPTION
WHEN value_error THEN
RETURN 'False';
END isNumeric;
Code to call the function:
SELECT DECODE(isNumeric(NVL("COL_A", 'null')) = 'True', "COL_A", 0) AS "valor"
FROM myTable
The answer above is probably the best response. If you wanted to use SQL instead of PL/SQL, the following should work:
SELECT col_a
FROM mytable
WHERE regexp_like( col_a, '^[[:digit:]]*$' );
If you are using PL/SQL and need to process records in a loop:
DECLARE
CURSOR mycur IS
SELECT col_a
FROM mytable
WHERE regexp_like(col_a, '^[[:digit:]]*$');
BEGIN
FOR myrec IN mycur LOOP
DBMS_OUTPUT.PUT_LINE(col_a);
END LOOP;
END;
Related
CREATE PROCEDURE book_check(book_Id varchar(64))
begin
declare book_available varchar(64);
select book_id into book_available
from book_copies
where No_of_Copies >0 and book_id=book_Id;
if(book_Id in book_available ) then
select concat ("Book available");
else
select concat ("Book not available");
end if;
end
//
what can i write in place of 'in' . I know the syntax i wrong .
It's easy - try something like this:
create or replace function book_check(book_id varchar) return varchar as
begin
for r in (select 1 from book_copies where no_of_copies > 0 and book_id = book_check.book_id) loop
return 'Book available';
end loop;
return 'Book not available';
end book_check;
/
It's unclear to me what you are trying to do. I assume you want to find out if a book is available or not and return that information to the caller of the function.
Your declaration of the procedure header and the variables is wrong.
Procedure or function parameters are not defined with a length for the datatype.
Inside a procedure or function you don't need declare
you can't have a select statement without putting the result somewhere. * Assigning a constant value to a variable is done using :=
If you want to return information to the caller, use a function, not a procedure
You should not give variables or parameters the same name as a column. A common naming convention in the Oracle world is to give parameters the prefix p_ and local variables the prefix l_ but anything that avoids a name clash between column names and variables is OK - just be consistent.
CREATE function book_check(p_book_id varchar)
return varchar
as
l_count integer;
l_result varchar(20);
begin
select count(*)
into l_count
from book_copies
where No_of_Copies > 0
and book_id = p_book_id;
if l_count > 0 then
l_result := 'Book available';
else
l_result := "Book not available";
end if;
return result;
end;
/
You should really take the time and read the PL/SQL Language reference. All the above is explained there.
I have the following code which is not executing correctly. I have data stored in date_tmp (varchar) that includes dates and nondates. I want to move the dates in that column to date_run (date) and data that is not a date, will be moved to a comments (varchar) column. When I run the following code, the entire set of data gets moved to comments. It runs fine when I edit out the insert statement and just run the dbms_outputline line. What might I be doing incorrectly?
DECLARE
CURSOR getrow IS
SELECT a.id, a.date_tmp
FROM mycolumn a
WHERE a.id < 1300;
v_date date;
BEGIN
FOR i in getrow LOOP
BEGIN
v_date := to_date(i.date_tmp, 'mm/dd/yy');
INSERT INTO mycolumn a(a.date_run)
VALUES(i.date_tmp);
EXCEPTION
WHEN OTHERS THEN
--dbms_output.put_line(i.date_tmp);
update mycolumn a
SET a.comments = i.date_tmp
where a.id = i.id;
END;
END LOOP;
END;
You try to insert varchar i.date_tmp into a date field. Instead insert v_date.
...
INSERT INTO mycolumn a (a.date_run)
VALUES(v_date);
...
But actually your requirement is a move. That calls for an update actually. So I think what you really want to do is:
...
update mycolumn a
SET a.date_run = v_date
where a.id = i.id
...
And actually you could have a function that checks if you have a valid date or not and then you might be able to handle the whole task using a simple update statement.
create or replace function is_a_date(i_date varchar2, i_pattern varchar2)
return date
is
begin
return to_date(i_date, i_pattern);
exception
when others return null;
end is_a_date;
With that function you could write two update statements
update mycolumn
set date_run = to_date(date_tmp,'dd/mm/yy')
where is_a_date(date_tmp, 'dd/mm/yy') is not null;
update mycolumn
set comment = date_tmp
where is_a_date(date_tmp, 'dd/mm/yy') is null;
I designed the function in a way that you could use it in various ways as it returns you a date or null but no exception if the varchar does not conform to the date pattern.
You have an insert where it looks like you need an update, like you have in the exception handler. So just change it to:
v_date := to_date(i.date_tmp, 'mm/dd/yy');
update mycolumn
set date_run = v_date
where id = i.id;
or you could shorten it to:
update mycolumn
set date_run = to_date(i.date_tmp, 'mm/dd/yy')
where id = i.id;
#hol solution is the best approach for me.
Avoid always you can loops and procedures if you can do it with simple SQL statments, your code will be more faster.
Also, if you have always have a data fixed format , you can ride of the PL/SQL function is_a_date function and do it everything with SQL... but the code gets a little uglier with something like this:
update mycolumn
set date_run = to_date(date_tmp,'dd/mm/yy')
where substr(date_tmp,1,2) between '1' and '31'
and substr(date_tmp,4,2) between '1' and '12'
and substr(date_tmp,7,2) between '00' and '99';
If you need more speed in your query or you have a huge amount of data in date_tmp, as function is_a_date is deterministic (always returns the same value given the same values for X, Y,), you can create an index for it:
create index mycol_idx on mycolumn(is_a_date(date_tmp));
And when you use the function, Oracle will use your index, like in those selects:
SELECT a.id, a.date_tmp
FROM mycolumn a
WHERE a.id < 1300
and is_a_date(a.date_tmp) is not null;
SELECT a.id, a.date_tmp
FROM mycolumn a
WHERE a.id < 1300
and (is_a_date(a.date_tmp) is not null and is_a_date(a.date_tmp)>sysdate-5);
I have a list of comma-separated strings (from a user input) and I'd like to use this list as a parameter in a pl/sql stored function in a nested sql block using a "not in where clause".
I can't find an elegant way to make it work...
That's what I'm thinking of:
CREATE TABLE example ( somevalue VARCHAR(36) NOT NULL);
--
INSERT INTO example VALUES ('value1');
INSERT INTO example VALUES ('value2');
INSERT INTO example VALUES ('value3');
--
SELECT * FROM example;
--
CREATE OR REPLACE
FUNCTION resultmaker(
ignoreList IN VARCHAR2)
RETURN VARCHAR2
IS
result VARCHAR2(4000);
BEGIN
result := 'Here is my calculated result, using ignorelist=' || ignoreList || ':' || CHR(10);
FOR rec IN
(SELECT DISTINCT somevalue
FROM example
WHERE somevalue NOT IN resultmaker.ignoreList -- here's my issue, the NOT IN clause using the parameter value
)
LOOP
result := result || 'not in ignorelist: ' || rec.somevalue || CHR(10);
END LOOP;
result := result || '.' || CHR(10);
--
RETURN result;
END resultmaker;
/
--
-- simulate function call with user input 'value2, value3'
SELECT resultmaker('value2, value3') FROM dual; -- doesn't work
--
DROP TABLE example;
DROP FUNCTION resultmaker;
Just pass the parameter like '"value2","value3"' and have your statement replace the double quote with single quotes like REPLACE(#Param1,'"','''').
Call to function: SELECT * FROM Function1('"value2","value3"')
Inside function: NOT IN REPLACE(#Param1,'"','''')
In every case you should parse that input. As there is no built-in string tokenizer in PL/SQL (at least I couldn't find it) You may want to look into these options,
http://blog.tanelpoder.com/2007/06/20/my-version-of-sql-string-to-table-tokenizer/
Does PL/SQL have an equivalent StringTokenizer to Java's?
After you parsed the string, you may create a new string like:
not_in_statement varchar2(1000);
CURSOR c1 IS select token from tokenized_strings_table;
BEGIN
not_in_statement := '('
FOR rec IN c1 LOOP
not_in_statement := not_in_statement || '''||rec.token||'''||','
END LOOP
not_in_statement := not_in_statement||')'
END
SELECT DISTINCT somevalue
FROM example
WHERE somevalue NOT IN not_in_statement
You may need to make it dynamic SQL, I did not have time to try.
Here's my solution using dynamic sql for my original question above:
CREATE TABLE example ( somevalue VARCHAR(36) NOT NULL);
--
INSERT INTO example VALUES ('value1');
INSERT INTO example VALUES ('value2');
INSERT INTO example VALUES ('value3');
--
SELECT * FROM example;
--
CREATE OR REPLACE
FUNCTION resultmaker(
ignoreList IN VARCHAR2)
RETURN VARCHAR2
IS
result VARCHAR2(4000);
example_cursor sys_refcursor;
rec example.somevalue%type;
BEGIN
result := 'Here is my calculated result, using ignorelist=' || ignoreList || ':' || CHR(10);
OPEN example_cursor FOR ( 'SELECT DISTINCT somevalue FROM example WHERE somevalue NOT IN (' || ignoreList || ')' );
FETCH example_cursor INTO rec;
WHILE example_cursor%found
LOOP
result := result || 'not in ignorelist: ' || rec || CHR(10);
FETCH example_cursor INTO rec;
END LOOP;
CLOSE example_cursor;
result := result || '.' || CHR(10);
--
RETURN result;
END resultmaker;
/
--
-- simulate function call with user input 'value2', 'value3'
SELECT resultmaker('''value2'', ''value3''') FROM dual;
--
DROP TABLE example;
DROP FUNCTION resultmaker;
The classic and probably correct solution would be to use PL/SQL table passing it as prameter...
There are some good solutions at asktom.oracle.com regarding taking a string of values and dynamically creating an IN clause for them:
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:210612357425
DECLARE
v_name A.TRANSACTION_TYPE%TYPE :='SALARY';
v_salary A.SALARY%TYPE := 1000;
BEGIN
update A set v_name= v_salary where EMPID = 517;
-- PL/SQL: ORA-00904: "v_name": invalid identifier
--update A set SALARY = 1000 where EMPID = 517;
END;
/
My idea is to update table columns , but these column names are stored in variable. Is there any way to pass column names from variable ? Is there any options apart from Execute Immediate
Not sure if this will work in your situation, but I've written solutions where I wrote a script in SQLPlus and it "wrote" (using dbms_output.put_line or even just prompt) another script that did queries, and the columns/tables in those queries was determined by the logic in the SQLPlus script. Then I would execute as a script the output from my first script, and it would execute dynamically generated queries without ever needing execute immediate.
The following idea may work for multiple columns that are typed the same... As written, it will update all columns every time for a given record, but only the column specified by v_name will be changed to the value set in v_value; the other columns are simply updated to their existing value. The idea can be played with using DECODE, NVL or other similar conditional operators.
declare
v_name varchar2(20):= 'SAL';
v_value emptest.sal%TYPE := 5000;
begin
update emptest
set sal = ( select case when v_name = 'SAL' then v_value else sal end from dual),
comm = ( select case when v_name = 'COMM' then v_value else comm end from dual)
where empno = 7369;
commit;
end;
I am writing a PL/SQL Procedure that performs a select based on input variables and then inserts a row for each result in the select. I am having trouble debugging what is wrong with my query due my newness to PL/SQL. I know this must be easy, but I am stuck here for some reason. Thanks for your help!
CREATE OR REPLACE PROCEDURE setup_name_map(ranking_id IN NUMBER, class_string IN VARCHAR2)
IS
BEGIN
FOR rec IN (SELECT NAME_ID FROM PRODUCT_NAMES WHERE NAME = class_string)
LOOP
EXECUTE IMMEDIATE 'INSERT INTO NAME_RANKING (NAME_ID, RANKING_ID) VALUES (' || rec.NAME_ID || ', ' || ranking_id || ')';
END LOOP;
END;
According to the Oracle Developer Compiler... 'NAME_ID' is an invalid identifier. I've tried putting it in quotes but no dice. It also complains that loop index variables 'REC' use is invalid. Any help is much appreciated.
There is no need for dynamic SQL here:
BEGIN
FOR rec IN (SELECT NAME_ID FROM PRODUCT_NAMES
WHERE NAME = class_string)
LOOP
INSERT INTO NAME_RANKING (NAME_ID, RANKING_ID)
VALUES (rec.NAME_ID, ranking_id);
END LOOP;
END;
Better still you can avoid a slow row-by-row cursor approach like this:
BEGIN
INSERT INTO NAME_RANKING (NAME_ID, RANKING_ID)
SELECT NAME_ID, ranking_id FROM PRODUCT_NAMES
WHERE NAME = class_string;
END;
If you really did need the dynamic SQL you should not be concatenating values into it, but using bind variables:
BEGIN
FOR rec IN (SELECT NAME_ID FROM PRODUCT_NAMES
WHERE NAME = class_string)
LOOP
EXECUTE IMMEDIATE 'INSERT INTO NAME_RANKING
(NAME_ID, RANKING_ID) VALUES (:b1, :b2)
USING rec.NAME_ID, ranking_id;
END LOOP;
END;