i am pretty new to oracle and i am searching for two days already for a solution for my problem.
i have a view which should have a dynamic column and table name.
something like that:
DECLARE
plsql_block VARCHAR2(500);
BEGIN
plsql_block := 'SELECT CONCAT('some','column') FROM CONCAT('some','table')';
EXECUTE IMMEDIATE plsql_block
END;
This would work but how to i display the result? I already tried it with DBMS.Output and a Loop but thats not exactly what i want. i need that it is displayed as a normal result set in the GUI when i run this command. Does anyone has a hint for me how i am doing this in oracle?
I am Thankful for every answer
Thanks pat
Actually I don't understand your dynamic query. But as per my understanding this query is multirow result result set. So you need to use BULK collect and iterate throuh the output for just the purpose of display.
There are two approaches
1) Just to display the output.
SET serveroutput ON;
DECLARE
plsql_block VARCHAR2(500);
lv_col1 VARCHAR2(10):='1';
lv_col2 VARCHAR2(10):='2';
type tab_var
IS
TABLE OF VARCHAR2(10);
tab tab_var;
BEGIN
plsql_block := 'SELECT CONCAT('||lv_col1||','||lv_col2||') FROM dual';
EXECUTE immediate plsql_block bulk collect INTO tab;
FOR i IN tab.first..tab.last
LOOP
dbms_output.put_line(tab(i));
END LOOP;
END;
2) Approach will be refactor this into a function and then use it as below.
Creating a Table Type
create or replace
type string_table
IS TABLE OF VARCHAR2(100);
CREATE OR REPLACE
FUNCTION func_mu
RETURN string_table
AS
plsql_block VARCHAR2(500);
lv_col1 VARCHAR2(10):='1';
lv_col2 VARCHAR2(10):='2';
tab string_table;
BEGIN
plsql_block := 'SELECT CONCAT('||lv_col1||','||lv_col2||') FROM dual';
EXECUTE immediate plsql_block bulk collect INTO tab;
RETURN tab;
END;
SELECT * FROM TABLE(func_mu);
If you are on Oracle 12c (with the corresponding Oracle client), you can do this:
declare
l_resultset sys_refcursor;
l_sql_text varchar2(500) :=q'{select 'Hello, 12c!' as greeting from dual}';
begin
open l_resultset for l_sql_text;
dbms_sql.return_result(l_resultset);
end;
(Untested, because I'm not near a 12c command line right now.)
Related
I keep some commands in CLOB format. I have the command "update WAYBILLS set TARE = 1212 where EXTERNAL_ID = 1212". I want to do it by calling in the process. I want to perform the actions described in this command. But I do not understand how, I will be grateful for the help
declare
l_clob CLOB;
v_sql CLOB;
BEGIN
v_sql := 'update WAYBILLS set TARE = 1212 where EXTERNAL_ID = 1212';
END ;
The easiest way to execute dynamic SQL is to use EXECUTE IMMEDIATE. Use bind variables.
DECLARE
v_sql CLOB;
v_id PLS_INTEGER := 1212;
BEGIN
v_sql := 'UPDATE waybills SET tare = :id WHERE external_id = :id';
EXECUTE IMMEDIATE(v_sql) USING v_id, v_id;
END;
/
If your statements are longer than 32k, then you have to deal with DBMS_SQL.
You can find more information for example here: Database PL/SQL Language Reference
I would like to create record from refcursor. My code:
set serveroutput on
DECLARE
c_curs SYS_REFCURSOR;
v_id NUMBER;
BEGIN
pck_prov.get_value_type_list (1, c_curs); --> procedure called here
-- I guess this is the place where record can be created from cursor.
LOOP
FETCH c_curs
INTO v_id;--instead of fetching into variable I would like to fetch into row
EXIT WHEN c_curs%NOTFOUND;
DBMS_OUTPUT.PUT_LINE(v_id);--if fetching is done into row, only selected columns can be printed, like myrow.id
END LOOP;
CLOSE c_curs;
END;
Please note: I know how to create record from cursor which is defined with select statement as it is described here. What I don't know is how to use same technique for refcursors.
EDIT:
Code from here is just what I need, but it throws error:
set serveroutput on
VAR c_curs refcursor;
EXECUTE pck_prov.get_value_type_list(1, :c_curs);
BEGIN
FOR record_test IN :c_curs LOOP
dbms_output.put_line(record_test.id);
END LOOP;
END;
Error: error PLS-00456: item 'SQLDEVBIND1Z_1' is not a cursor.
Just to clarify question:
In my database there is around 200 packages.
Every package has several stored procedures inside - and usually each procedure is combined with columns from different tables. That is why it would be the best to have some dynamically created cursor, so I can make simple select just like in the example I've posted.
From Oracle 12.1 onward, you could use the DBMS_SQL.return_result procedure. SQL Plus displays the contents of implicit statement results automatically. So, rather than defining explicit ref cursor out parameters, the RETURN_RESULT procedure in the DBMS_SQL package allows you to pass them out implicitly.
DECLARE
c_curs SYS_REFCURSOR;
v_id NUMBER;
BEGIN
pck_prov.get_value_type_list (1, c_curs);
DBMS_SQL.return_result(c_curs); --> Passes ref cursor output implicitly
END;
/
In fact, no need of this separate PL/SQL block, you could add the DBMS_SQL.return_result(c_curs) statement in your original pck_prov.get_value_type_list procedure itself.
Just define a PL/SQL RECORD type that matches the cursor and FETCH into it.
DECLARE
c_curs SYS_REFCURSOR;
TYPE rec_t IS RECORD ( object_name VARCHAR2(30), object_type VARCHAR2(30) );
v_rec rec_t;
BEGIN
OPEN c_curs FOR
SELECT object_name,
object_type
FROM dba_objects
WHERE object_name like 'DBA%TAB%';
LOOP
FETCH c_curs
INTO v_rec;
EXIT WHEN c_curs%NOTFOUND;
DBMS_OUTPUT.PUT_LINE(v_rec.object_name || ' - ' || v_rec.object_type);
END LOOP;
CLOSE c_curs;
END;
DBA_ADVISOR_SQLA_TABLES - VIEW
DBA_ADVISOR_SQLA_TABVOL - VIEW
DBA_ADVISOR_SQLW_TABLES - VIEW
DBA_ADVISOR_SQLW_TABVOL - VIEW
DBA_ALL_TABLES - VIEW
etc...
I am trying to execute this procedure:
CREATE OR REPLACE PROCEDURE SP_DYNAMIC
AS
tbl_list VARCHAR2(2000);
DBLINK VARCHAR2(100);
V_SQL VARCHAR2(1000);
BEGIN
DBLINK := 'SOME_LINK';
V_SQL := 'SELECT table_name,table_owner FROM dba_tab_modifications#:DB_LINK';
EXECUTE IMMEDIATE V_SQL USING DBLINK;
COMMIT;
Dbms_Output.PUT_LINE (TBL_LIST);
END;
But When I execute the stored procedure I get the error:
ORA-01729: database link name expected
ORA-06512: at "SYSTEM.SP_DYNAMIC"
ORA-06512: at line 2
Can somebody help me with what I am doing wrong here?
The reason it doesn't work is because you can't use a bind variable as the dblink. You get the same error when running the following:
select * from dual#:dblink;
If you absolutely must use dynamic sql, you'd have to concatenate the dblink name into the statement - but you'll have to be aware that you're now open to SQL Injection:
V_SQL := 'SELECT table_name,table_owner FROM dba_tab_modifications#'||DB_LINK;
Devs,
I've searched everywhere I can, but I could not find solution to this simple problem.
Situation:
I need to write a procedure where it takes a column name as the input and return all the distinct values present in that column as output. And then I have to use this procedure in some c# code.
In MS server, it is very easy as it will directly give the set of results unlike in PL/SQL.
Script I could write (which is not giving me the result I need):
CREATE OR REPLACE
PROCEDURE GetCol(PARAM IN STRING, recordset OUT sys_refcursor)
AS
BEGIN
OPEN recordset FOR
SELECT DISTINCT(PARAM)
FROM my_table;
END
;
When I try to check the data in the recordset using this code:
DECLARE
l_cursor SYS_REFCURSOR;
l_sname VARCHAR2(50);
BEGIN
GetCol('col_name',l_cursor);
LOOP
FETCH l_cursor INTO l_sname;
EXIT WHEN l_cursor%NOTFOUND;
DBMS_OUTPUT.PUT_LINE(l_sname);
END LOOP;
CLOSE
Can someone help me with this code please.
You can also open a ref_cursor for a string value. Please take a look at this:
CREATE OR REPLACE PROCEDURE GetCol(PARAM IN VARCHAR2, recordset OUT sys_refcursor)
AS
QRY varchar2(100);
BEGIN
QRY := 'SELECT DISTINCT '||PARAM||' FROM my_table';
OPEN recordset FOR QRY;
END;
Then:
DECLARE
l_cursor SYS_REFCURSOR;
l_sname VARCHAR2(50);
BEGIN
GetCol('col_name',l_cursor);
LOOP
FETCH l_cursor INTO l_sname;
EXIT WHEN l_cursor%NOTFOUND;
DBMS_OUTPUT.PUT_LINE(l_sname);
END LOOP;
END;
Your problem is caused by ambiguity about what PARAM is in the procedure's SELECT statement:
CREATE OR REPLACE
PROCEDURE GetCol(PARAM IN STRING, recordset OUT sys_refcursor)
AS
BEGIN
OPEN recordset FOR
SELECT DISTINCT(PARAM) -- Ambiguity here
FROM my_table;
END;
Does PARAM refer to the table column or to the first parameter of the procedure? Oracle has assumed the parameter. You can explicitly say which like this:
SELECT DISTINCT(my_table.PARAM)
FROM my_table;
You could if appropriate (it probably isn't here) specify the procedure parameter instead:
SELECT DISTINCT(GetCol.PARAM)
FROM my_table;
Generally this is best avoided by:
always using table aliases in column references select statements, and
having a standard for parameter names that makes them less likely to clash e.g. P_PARAM.
I have a stored procedure which returns a ref cursor as follows:
CREATE OR REPLACE PROCEDURE AIRS.GET_LAB_REPORT (ReportCurTyp OUT sys_refcursor)
AS
v_report_cursor sys_refcursor;
report_record v_lab_report%ROWTYPE;
l_sql VARCHAR2 (2000);
BEGIN
l_sql := 'SELECT * FROM V_LAB_REPORT';
OPEN v_report_cursor FOR l_sql;
LOOP
FETCH v_report_cursor INTO report_record;
EXIT WHEN v_report_cursor%NOTFOUND;
END LOOP;
CLOSE v_report_cursor;
END;
I want to use the output from this stored procedure in another select statement like:
SELECT * FROM GET_LAB_REPORT()
but I can't seem to get my head around the syntax.
Any ideas?
Whenever I've had to do this; I've used the Oracle TYPE and CAST features.
Something like:
SELECT *
FROM TABLE(CAST(F$get_Cassette_Tracking('8029241') AS cass_tracking_tab_type))
You need to setup the TYPE and all the columns you need and have them use:
pipe ROW(out_obj)
to capture your data. There are many ways to do this and if I can dig out a better example I will but this might give you an idea.
See this SO for a working example: Oracle Parameters with IN statement?