Cx_Oracle cursor - return named tuple

Hello All,
I'm having trouble figuring a way to convert the row returned from a basic execute statement into a named tuple/Dictionary.
The idea, is to be able to access each field via row['column_name']. I'm currently looking at creating a factory, but still a complete noob to python and cx_Oracle.
cur.execute(""SELECT * FROM V$INSTANCE""")
#print 'Query Executed..'
row = cur.fetchone()
#print 'Cursor Loaded.'
#print result[0], result[1]
list = {}
list['host_name'] = row['host_name']
print row['host_name']
Thanks in advance for your assistance.
Jan S.

Hello All,
Managed through some weird keyword search to find a nice little article. here is the solution.
cur = oracle.cursor()
cur.execute("""SELECT * FROM V$DATABASE""")
data = rows_to_dict_list(cur)
for row in data:
print row['PROTECTION_LEVEL']
def rows_to_dict_list(cursor):
columns = [i[0] for i in cursor.description]
return [dict(zip(columns, row)) for row in cursor]
Thanks
Jan S.
ps - I hate these new editors, Python requires indentations, but that does not mean I want to create and html table from it.

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How to find if cursor returned rows

If i have a procedure like
create procedure test as
cursor cur_test is
select col
from table;
begin
     delete from tab1 a;
     for var_cur_test in cur_test
     loop
          insert into temp
          values(var_cur_test.col);
     end loop;
     commit;
end;
How do I check if the cursor has returned any rows?
I dont want to delete from tab1 if cursor 'cur_test' does not return any rows and I want to exit out of the proc.
If the cursor returns rows > 0 then I want to delete and do the insert.
Thanks for the help.

The scenario is like this.
There is a schema A which has to run a process and populate its tables and at the end of the process(java program) run the procedure which is in schema B to pull data from schema A and populate the tables in schema B. If there is a case where Schema A's process fails( then Schema A's tables end up with no data), the process is still running the procedure in schema B and deleting the data in tables with no data being inserted.
So, I have to check in the procedure if the tables in Schema A have any data before the process can run the proc.
I tried the solution you provided but it returns no data
CREATE OR REPLACE PROCEDURE MMA_TEST
VAR_CONTRACT_ID VARCHAR2
AS
CURSOR CUR_TEST IS
SELECT CMS_CONTRACT_ID,CMS_PLAN_ID
FROM MMA_PLANS
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Creating a function having a ref cursor returned

I get an error message for the following code below. I am trying to create a function that allows the users to pass in a certain parameter which is used to invoke a specific query for the paramented passed in. Once the query is invoked, it should return a ref cursor. Please help. I am still using pl/Sql developer.
create or replace package TEST2 is
type rec_DropDownList_Item is RECORD(
TEXT_TYPE VARCHAR2(200),
xsVALUE VARCHAR2(200));
TYPE cur_DropDownList IS REF CURSOR RETURN rec_DropDownList_Item;
FUNCTION Getprocedure_yearreportdisplay (need_type in VARCHAR2) RETURN cur_DropDownList;
end TEST2;
create or replace package body TEST2 is
FUNCTION Getprocedure_yearreportdisplay (need_type in VARCHAR2)
RETURN cur_DropDownList IS
my_ref_cursor cur_DropDownList;
BEGIN
OPEN my_ref_cursor FOR
SELECT vehicletype, vehicledescription
FROM cars where vehicletype = need_type;
return my_ref_cursor;
END Getprocedure_yearreportdisplay;
end TEST2;

user13046875 wrote:
a simple example might help because I am having a difficult understanding the reply. Thank you.
create or replace package TEST2 is
   type rec_DropDownList_Item is RECORD(
   TEXT_TYPE VARCHAR2(200),
   xsVALUE VARCHAR2(200));
   TYPE cur_DropDownList IS REF CURSOR RETURN rec_DropDownList_Item;
   FUNCTION Getprocedure_yearreportdisplay (need_type in VARCHAR2) RETURN cur_DropDownList;
end TEST2;
create or replace package body TEST2 is
FUNCTION Getprocedure_yearreportdisplay (need_type in VARCHAR2)
RETURN cur_DropDownList IS
my_ref_cursor cur_DropDownList;
BEGIN
   OPEN my_ref_cursor FOR
   SELECT 'column1', 'column2'
   FROM dual;
   return my_ref_cursor;
END Getprocedure_yearreportdisplay;
end TEST2;
TUBBY_TUBBZ?variable x refcursor;
TUBBY_TUBBZ?
TUBBY_TUBBZ?exec :x := TEST2.Getprocedure_yearreportdisplay('dummy');
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.01
TUBBY_TUBBZ?print :x
'COLUMN 'COLUMN
column1 column2
1 row selected.
Elapsed: 00:00:00.03
TUBBY_TUBBZ?Is an example of running in SQLPLUS (you may want to get your own copy, it's free and available on OTN).

How to read my cursor that is ref cursor returning user defined type

Hi
I have types defined as follows:
TYPE MY_RECORD IS RECORD (
COL1 TABLE1.COL1%TYPE,
COL2 TABLE1.COL2%TYPE
TYPE MY_CURSOR IS REF CURSOR
RETURN MY_RECORD;This is used as return type in a stored procedure.
I have a pl/sql block where I make a call to the SP that returns this cursor.
How can I read individual values being returned from SP?

SQL> create or replace package pkg
as
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   type my_cursor is ref cursor
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end pkg;
Package created.
SQL> create or replace package body pkg
as
   procedure p (cur out my_cursor)
   as
   begin
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           from   emp
          where   rownum <= 2;
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end pkg;
Package body created.
SQL> declare
   cur     pkg.my_cursor;
   e_rec   pkg.my_record;
begin
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Empno: 7369; Ename: SMITH
Empno: 7499; Ename: ALLEN
PL/SQL procedure successfully completed.

What is a good way to check if sql select basd cursor return anything

Hello everyone,
I am trying to find a good way to identify that a SQL select based cursor return nothing.
I know that or we use exception when no data found, or count(*) to check how many rows are returned.
I have a cursor based on quite a long select statement.
Like
CREATE OR REPLACE PROCEDURE aaa (v_input IN NUMBER, v_output OUT VARCHAR2)
     CURSOR long_cursor IS
          --long select statement(with input variable) ;
BEGIN
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     Into v_count
From
-- a long select statment with input again ;
IF v_count > 0 then
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     --Get information from cursor
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    End loop;
END IF;
END;Is there any other way than the above ?
I would love to reduce the amount of typing. I know that repetition in code is not good.
Thanks in advance,
Ann
Edited by: Ann586341 on Feb 28, 2013 2:29 PM

>
Not sure I understand your point. I am still a new bie here.
>
A flag is just a piece of data. By itself it doesn't prevent anyone from changing the data. And in a multiuser system anything you try to check is based on the COMMITTED data in the system. Two users can be changing two different rows at the same time but neither user will see the other change.
So if you try to count how many rows meet a particular condition you may get a count of 8 but after the other user commits the count might be 7 or 9. So if you use 8 it may not be valid for very long.
>
But the app we use is Oracle Application Express 4.0.
I assume when the data is read, there will be some kind of lock on these rows so other users cannot change it, right ?
Or should I use SELECT for update even I do not update anything here.
>
I can't help you with that one. That would be a question for the application express forum.
Oracle Application Express (APEX)
You don't need to use FOR UPDATE if you don't plan to change the data. But, as explained above, you can't rely on any data you query being the same because another user could be changing it while you are looking at it.

Ref cursor returns login ids

I have this ref cursor that returns login ids from a procedure.
While I can define the ref cursor as sys_refcursor; I want to use strongly typed ref cursor ( for improved readabilty of code).
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e.g. Type return_login_id IS REF CURSOR return tab1.login_id%type;
On compilation the package threw an error saying the return type should be record.
I need to define a record with one column and use that as return type ?
any other way around ?
TIA
S

Btw, why you need to use REF Cursor?
You can use just a cursor:
SQL> declare
2 cursor c1 is select empid from emp;
3 TYPE my_id IS TABLE OF emp.empid%type;
4 myid my_id := my_id();
5 BEGIN
6 OPEN c1;
7 FETCH c1 BULK COLLECT INTO myid;
8 CLOSE c1;
9 END;
10 /
PL/SQL procedure successfully completed.
SQL>

Ref cursor return type

i am using a ref cursor as out parameter in a stored procedure.
When I call the stored procedure and want to retrieve the rows returned by the ref cursor,
is there a way to fetch the records using something like %ROWTYPE if I donot know the type of rows returned by the cursor.
eg.
procedure my_test_ref_cursor ( a OUT SYS_REFCURSOR) IS
BEGIN
OPEN a FOR SELECT EMP_ID, EMP_NAME FROM EMP;
END;
procedure call_my_test_ref_cursor is
b sys_refcursor;
begin
my_test_ref_cursor(b);
fetch b into XXXXXXX - if this program doesnot know the type of ref cursor 'b' is pointing to is there a way to use
something like %ROWTYPE here ?
end;

While you can use the logic to return a weakly typed reference cursor, there should be a compelling why. A strongly typed reference cursor may be a better solution. You define a strongly typed reference cursor inside a package, and you anchor it to a ROWTYPE. Weakly typed reference cursors are typically useful when you are working with a subset of a table because you can't anchor to part of a table. However, you can define a view that uses the portion of the table and anchor a strongly typed reference cursor to the view.
A strongly typed PL/SQL reference cursor is defined like this in a package specification:
TYPE strongly_typed_cursor IS REF CURSOR RETURN some_table%ROWTYPE;
So, if you rewrote it like this ...
PROCEDURE my_test_ref_cursor (a OUT SOME_PACKAGE.STRONGLY_TYPED_CURSOR) IS
BEGIN
OPEN a FOR SELECT emp_id, emp_name FROM emp;
END;
Now, you can access it like this ...
PROCEDURE call_my_test_ref_cursor IS
another_var SOME_PACKAGE.STRONGLY_TYPED_CURSOR;
target SOME_TABLE%ROWTYPE;
BEGIN
my_test_ref_cursor(another_var);
LOOP
FETCH another_var INTO target;
EXIT WHEN another_var%NOTFOUND;
dbms_output.put_line('See it '||target.emp_name||'.');
END LOOP;
END;
The DBMS_SQL method you're looking for is Method 4. My recollection is that there isn't a good example in the docs but I could be wrong ... The OCI works no differently, nor does the JDBC interface. Hope this helps.

Field validation with cursor returning on the field in error.

Hi,
Is there a way to return the cursor to a specific INPUT field on an alv grid after a validation return an error on it?
Thanks.

Hi,
Try using the method SET_CURRENT_CELL_VIA_ID..
Please check this thread..
Re: Can we scroll to the last page of an alv grid?
Thanks
Naren

When I hit return after typing, the cursor returns to the beginning of the sentence

I open a new layer.
I type my text
I hit return'
The cursor starts typing at the beginning of the sentence, typing right over the text I just finished. It will not go to the next line. I've been using PS since 2 and I have never seen this nor do I know what to do about it.
Help...
Thanks

starbird parrot wrote:
Thank you. I had no idea. I do not believe I have ever touched that or even seen it. I don't do a lot of text, I'm a photographer. Nor do I know what a leading value is...
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If you have a Lynda.com subscription, Nigel French has an excellent title called Photoshop for Designers — Type Effects. Nigel also has a nice British accent, and a lot easier to listen to than some Lynda.com presenters.
Watch the Online Video Course Photoshop for Designers: Type Effects
Nigel has a whole raft of Lynda.com titles

Cursors returned from a package

Ok, I've done this a long time ago but how do I get a package to return a cursor?
Here's my spec...
CREATE OR REPLACE PACKAGE reservationhistory AS
TYPE ResType IS RECORD
               (resid integer,
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PROCEDURE getHistory(i_providerid in integer,
     resdetail in out ResType,
     o_error_code out varchar2);
END reservationhistory;
Here's my attempt at the body...
CREATE OR REPLACE PACKAGE BODY reservationhistory AS
PROCEDURE getHistory(i_providerid in integer,
          resdetail in out ResType,
          o_error_code out varchar2) IS
BEGIN
OPEN resdetail FOR
               select bookingid resid, status, providerid from booking
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          o_error_code := 0;
END getHistory;
END reservationhistory;
But it doesn't like this.
What am I missing???
Thanks,
Todd

Thanks, I tried that and but it still doesn't work. The following code gives me this error:
LINE/COL ERROR
10/9 PLS-00306: wrong number or types of arguments in call to
'RESDETAIL'
10/9 PL/SQL: SQL Statement ignored
Here's the code...
CREATE OR REPLACE PACKAGE reservationhistory AS
TYPE ResType IS ref cursor;
PROCEDURE getHistory(i_providerid in integer,
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     o_error_code out varchar2);
END reservationhistory;
CREATE OR REPLACE PACKAGE BODY reservationhistory AS
PROCEDURE getHistory(i_providerid in integer,
          resdetail in out ResType,
          o_error_code out varchar2) IS
BEGIN
OPEN resdetail FOR
               select bookingid resid, status, providerid from booking
               where providerid = i_providerid;
          o_error_code := 0;
END getHistory;
END reservationhistory;
I appreciate your help on this.

Why does the cursor return to the top of the screen?

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I need to know how many lines a cursor returns

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Please post this question in the database forum for an appropriate response: General Database Discussions
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Pro*C program to use a REF CURSOR returned by a DB Function

Hi,
Please help me with this.
I have a pro*c program that should call a
database function which returns a ref cursor.
This is the sample code i have :-
EXEC SQL BEGIN DECLARE SECTION;
SQL_CURSOR emptycabin_cursor;
int cabinid;
EXEC SQL END DECLARE SECTION;
EXEC SQL ALLOCATE :emptycabin_cursor;
EXEC SQL EXECUTE BEGIN
:emptycabin_cursor:=posremptycabin(:voy,:segid);
END;END-EXEC;
/* more_records = 1*/
while (more_records)
EXEC SQL FETCH :emptycabin_cursor INTO :cabinid;
if (SQLCODE==NOTFOUND)
{more_records=FALSE;break;}
EXEC SQL close :emptycabin_cursor;
When I execute I keep getting fetch out of sequence error.
Can someone let me know whats wrong with this code?
When I execute the function from sqlplus
variable ref_cur refcursor ;
exec :ref_cur:=posremptycabin(232,'CC');
print :ref_cur;
I get the data properly displayed.So nothing wrong with the function.
Thanks for your help

I know nothing about Pro*C, but Tom Kyte's Pro*C example for ref cursors fetches the cursor with a loop that looks like:
for( ;; )
        EXEC SQL WHENEVER NOTFOUND DO break;
        EXEC SQL FETCH :my_cursor INTO :ename, empno;
        printf( "'%.*s', %d\n", ename.len, ename.arr, empno );
    EXEC SQL CLOSE :my_cursor;http://asktom.oracle.com/~tkyte/ResultSets/index.html
Hope this helps.

Locking a cursor to named plot

I am trying to lock a named cursor to a named plot. If I don't have a name for the cursor and leave the numerical index, the cursor will "lock to plot". If I use a property node to assign a cursor name, then all of the plots lock to the last cursor name.
I set up the properties in the cursor list before the name is applied to the cursor.

hello,
I dont know if it is exactly what ou want to. I have done an example using property node to associate a cursor with a plot. Tell me if it is what you want to.
Hope this help.
Isabelle Jean
Isabelle
Ingénieur d'applications
National Instruments France
Attachments:
cursor.vi ‏37 KB

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Cx_Oracle cursor - return named tuple

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