Open cursor for PLSQL table of records

Is it possible to open a cursor for all data in a PLSQL table of records?
something like
cursor c (p1 number) is select * from <plsqltab>
where <plsqltab>.col = p1

There is no such thing as a PL/SQL table. Yes, I know that many calls this structure in PL/SQL a table. And that is exactly where all this confusion stems from.. and trying to treat such a "table" as an Oracle table using SQL.
The correct terms are dynamic array (indexed by integer) or dynamic associative array (indexed by varchar). And an array is nothing like a table ito RDBMS processing.
Yes, you can run SQLs against arrays. But it is "expensive". Why? Because the data sits inside PL/SQL Engine. Not in the SQL Engine. The data is in a PL/SQL defined structure. Not a SQL defined structure.
So.. the data needs to be shipped from the PL/SQL Engine to the SQL Engine and converted into a format that the SQL Engine can understand and use.
Also, once shipped and converted the SQL structure is not indexed. Which means that the only option is a full table scan of that structure.
So you need to ask yourself why do you want to use SQL against a PL/SQL array? As soon as you do that, you are saying "Hey, this PL/SQL table ain't good enough and I need to process it using SQL".
So why then does that data sit inside a PL/SQL array and not in a SQL table?
Oracle provides you with the ability to create temporary session tables. These can be indexed. SQL can be run against them without all the "expenses" that are associated with running SQL against a PL/SQL array.
PL/SQL arrays is a great tool. But only when it is the right tool to use. When someone says he/she needs SQL to use this tool, then I question the choice of the tool. Make sure you use the right tool for the job.

Similar Messages

Open cursor for plsql table

There's a way to open a cursor from a plsql table?

Hello
Have a look here:
http://asktom.oracle.com/pls/ask/f?p=4950:8:13876292179522624220::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:666224436920,

Open cursor for internal table

Hi folks,
I have a tricky question concerning the cursor function and internal tables. First of all, it is not possible to create a view. Instead I've to use a function module for extracting some data to the BI system.
Actually most of the time I work with SELECT (for outer joins) and internal tables. At the end I have a internal table and must open an cursor. As fact, I can't open a cursor for an internal table - only database tables are allowed.
OPEN CURSOR WITH HOLD s_cursor FOR SELECT * FROM lt_temp.
Does someone have a clue how to solve my problem? Obviously I have to use a db table for a open cursor statement but on the same way I have to use a internal table for all my previous SELECT-statements.
Thanks in advance for your help.
Regards,
Mrcl

Why don't you use EXEC and ENDEXEC
Check this link
http://help.sap.com/saphelp_nw04/helpdata/EN/fc/eb3b8b358411d1829f0000e829fbfe/content.htm
a®

Open cursor for ...using...

Hi all
1 general question- can someone explain me how 'using keyword in 'open cursor for ...' statement works.
Does it replace where clause and how?
open cur_xx for qry_xxx using text_xxx
where 'text_xxx' is going to be my codition in select statement
Tahnks everyone

http://oraclesvca2.oracle.com/docs/cd/B10501_01/appdev.920/a96624/13_elems35.htm

Maximum Open cursor Exceeded error when deleting records from a table

I have a strange problem.
I have a table EMP_MASTER . Whenever I am trying to delete a record from this table, I am getting Maximum no. of open cursor exceeded error. But this error doesnot come when i delete from any other tables. And no. of open cursor is much lesser than OPEN_CURSOR parameter.
All other tables (around 700) has foreign key constraint to this EMP_MASTER table for created_user paramater.
Is it some thing like, when I am trying to delete a record from EMP_master, implicit cursor opens up and checks all referenced tables. and that limit gets exceeded ?
Please help.
Thanks,
Raj

Raji03 wrote:
There is no trigger defined for this table.
Is there a limit on which no.of references made to a column ? Because one column in this field, Emp no is being referenced in almost every other table. around 700 tables. Will it have any adverse effect ?That should have nothing to do with your problem directly. Again, those tables could have triggers defined on them and you are leaking cursors in one of those triggers (wild guess).
An example of a table with many many others foreign key'd to it.
create table parent_of_everything
   column1 number primary key
insert into parent_of_everything select level from dual connect by level <= 1000;
commit;
--create 1000 tables all with foreign keys to the parent_of_everything
begin
   for i in 1 .. 1000
   loop
      execute immediate 'create table child_' || i || ' (column1 number, column2 number, constraint child_' || i || '_fk foreign key (column1) references parent_of_everything (column1) on delete cascade)';
      execute immediate 'insert into child_' || i || ' select level, mod(level, ' || i || ') from dual connect by level <= 1000';
      commit;
   end loop;
end;
TUBBY_TUBBZ?delete parent_of_everything;
1000 rows deleted.
Elapsed: 00:02:53.03No problems were had (none were expected).
Cleanup script.
--remove the 1000 child tables
begin
   for i in 1 .. 1000
   loop
      begin
         execute immediate 'drop table child_' || i || ' purge';
      exception when others
         then
            null;
      end;
   end loop;
end;
/

Open cursor for a nested table

Hi,
I want to open a cursor like:
open c1 for select * from emp;
BUT
I what the cursor results to be populated with contents of a nested table or associative array..
How can this be done???
Thanks in advance,
teo

Well, given a variable YOUR_EMP of nested table type EMP_NT it could be as simple as
open c1 for select * from TABLE( CAST(your_emp AS emp_nt));Cheers, APC

Open cursor for and bind variables

Hello all,
how can I assign values to a bind variable before opening a cursor?
example code:
DECLARE
   TYPE ref_cur_t IS REF CURSOR;
   l_ref_cur   ref_cur_t;
   l_query VARCHAR2 (100)
         := 'select * from table t1 where ndx= :var_index' ;
BEGIN
   -- assign a value to :var_index
   OPEN l_ref_cur FOR l_query;
END;Thanks!

Something like this ->
scott@ORCL>
scott@ORCL>DECLARE
2     l_ref_cur   sys_refcursor;
3     l_query VARCHAR2 (100) := 'select * from emp where empno = :var_index';
4     l_empno number(4);
5 BEGIN
6     l_empno := &emno;
7     -- assign a value to :var_index
8     OPEN l_ref_cur FOR l_query using l_empno;
9 END;
10 /
Enter value for emno: 7698
old   6:    l_empno := &emno;
new   6:    l_empno := 7698;
PL/SQL procedure successfully completed.
Elapsed: 00:00:19.78
scott@ORCL>Regards.
Satyaki De.

Open Cursor for insert actually inserts

Have been using code similar to this to prepare an SQL insert
statement before entering a loop to perform the inserts. Find
that the open actually performs an insert when it is executed,
so the table always has an extra row of garbage.
Is there some way to stop this behaviour? ProC compiler option
or open parameter. Currently I am doing a ROLLBACK after the
open to clear it.
Using the prepare because the table name is not known at compile
time.
EXEC SQL AT DB_1 PREPARE insert_cust FROM :szSqlInsertCustomer;
EXEC SQL AT DB_1 DECLARE insert_cust_cursor CURSOR FOR insert_cust;
EXEC SQL AT DB_1 OPEN insert_cust_cursor USING :customerId;
for ( ....)
customerID = ...;
EXEC SQL AT DB_DCMS EXECUTE insert_cust;
Also tried passing in the tablename as a host variable
EXEC SQL INSERT INTO :szTableName (CUSTOMER_ID) VALUES (:customerId);
ProC compiler gives the following error:
INSERT INTO :szTableName (CUSTOMER_ID) VALUES (:customerId);
........................1
PCC-S-02201, Encountered the symbol ":" when expecting one of the following:
( an identifier, a quoted string, date, table, count,
extract, interval, multiset, the, time, timestamp, treat,
trim, avg, max, min, sum, stddev, variance,
Thanks

You don't DECLARE and OPEN an insert statement (just selects). Just use EXECUTE ... USING ...

OPEN CURSOR FOR DELETE ROWS

This transaction will work properly?
I know it work but I have feeling it may cause a problem
To open a cursor and delete the row I have selected.
CREATE OR REPLACE PROCEDURE PRC_MAIN_INTER IS
BEGIN
BEGIN
FOR A IN (SELECT B.HIST_ID
FROM MOBIDEO.MAIN_INTER B
WHERE B.STATUS = 9)
LOOP
BEGIN
DELETE MAIN_INTER C WHERE C.HIST_ID = A.HIST_ID;
COMMIT;
END LOOP;
END;
COMMIT;
END PRC_MAIN_INTERF;

Sagi wrote:
Toon Koppelaars wrote:
Why not just:
BEGIN
DELETE FROM MOBIDEO.MAIN_INTER B WHERE B.STATUS = 9;
COMMIT;
END;
The original transaction is longer I have truncate it .
It also use log HIST_ID and some more detail for log table .Question: Are mobideo.main_inter and main_inter the same table? If so then
declare
cursor c_main_inter is select hist_id from main_inter where status=9 for update;
begin
for c in c_main_inter
loop
-- Logging, any other processing, etc.
delete from main_inter where current of c_main_inter;
end loop;
commit;
end;

Open cursor for existing procedure

Is it possible to open a refcursor for an existing procedure as apposed to opening a refcursor for a standard select statement. For example:
Standard select:
OPEN refcursor FOR
select * from my_table;
RETURN the_cursor;
Based on an existing procedure:
OPEN refcursor FOR
my_package.my_procedure();
RETURN the_cursor;
Note: my_procedure returns a table of record type rows defined by myself in the package spec.
Any help is much appreciated
Regards
Tony

Hi Sven
Thank you for that information however I am still a little unsure as to how to call the procedure including the necessary parameters. The procedure in question has the following IN parameters with one OUT parameter.
my_procedure (p_context_id in number,
p_username in varchar2,
p_mdata out mtab)
As you stated, if it is a procedure, which it is, then use the following:
my_package.my_procedure(the_cursor);
However if I need to pass parameters in the call that kind of conflicts where 'the_cursor' is?
Any ideas?
Tony

Parameterized cursor for varient Table name?

Hi all,
I am using Oracle 9i and have a cursor defined as :-
Code:
CREATE PROCEDURE Proc_Abc
AS
CURSOR
My_Cursor (UserName VARCHAR) IS
SELECT Emp_Name, Salary FROM Employee_Table
WHERE User_Name = UserName;
(Rest of the code)
This code is working perfectly, but if I try to provide the table name through the cursor variable, it gives an error
Below is the code that I am writing to pass table name through variable:-
Code:
CREATE PROCEDURE Proc_Abc
AS
CURSOR
My_Cursor (TableName VARCHAR, UserName VARCHAR) IS
SELECT Emp_Name, Salary FROM TableName
WHERE User_Name = UserName;
(Rest of the code)
All the tables that I need to pass through cursor variables have the same fields and are all pre known to me, thats why "SELECT Emp_Name, Salary " is remaining common throughout.
Please suggest how can I make a cursor with variant tables?
Thanks in advance.

The following procedure compares between two tables and then it picking the column from all_tab_column table and finally execute the SELECT statement to compare the data between this two table. But, you can proceed your program taking help from this -
satyaki>ed
Wrote file afiedt.buf
1 create or replace procedure compr_tab_dat(TAR_TAB IN VARCHAR2,
2                                            TAR_UID IN VARCHAR2,
3                                            SRC_TAB IN VARCHAR2,
4                                            SRC_UID IN VARCHAR2)
5 is
6   cursor c1
7   is
8    select column_name
9    from (
10           select column_name,column_id
11           from all_tab_columns
12           where table_name = SRC_TAB
13           and   owner = SRC_UID
14           intersect
15           select column_name,column_id
16           from all_tab_columns
17           where table_name = TAR_TAB
18           and   owner = TAR_UID
19         )
20     order by column_id;
21   cursor c_count
22   is
23     select count(column_name) as c_cnt
24     from (
25             select column_name
26             from all_tab_columns
27             where table_name = SRC_TAB
28             and   owner = SRC_UID
29             intersect
30             select column_name
31             from all_tab_columns
32             where table_name = TAR_TAB
33             and   owner = TAR_UID
34           );
35   rec1 c1%rowtype;
36   rec2 c1%rowtype;
37   rec3 c1%rowtype;
38   rec6 c_count%rowtype;
39   cnt number(10);
40   cnt1 number(10);
41   str varchar2(32000);
42   --str clob;
43 BEGIN
44     cnt := 0;
45     cnt1 := 1;
46     dbms_output.enable(10000000);
47     for rec6 in c_count
48     loop
49      cnt := rec6.c_cnt;
50     end loop;
51     if cnt = 0 then
52        dbms_output.put_line('No matched columns found.... ');
53     else
54        dbms_output.put_line('UnMatched Datas Are-- ');
55           str:='declare '||
56          ' cursor c3 '||
57          ' is '||
58          '    select ';
59           open c1;
60           loop
61             fetch c1 into rec1;
62             exit when c1%notfound;
63             if cnt = cnt1 then
64                str:= str||rec1.column_name;
65             elsif cnt1<cnt then
66               str:= str||rec1.column_name||',';
67             end if;
68             cnt1 := cnt1 + 1;
69           end loop;
70           close c1;
71           str:=str||' from '||SRC_TAB||
72                ' minus '||
73                ' select ';
74           cnt1:=1;
75           open c1;
76           loop
77             fetch c1 into rec2;
78             exit when c1%notfound;
79             if cnt = cnt1 then
80                str:= str||rec2.column_name;
81             elsif cnt1<cnt then
82                str:= str||rec2.column_name||',';
83             end if;
84             cnt1 := cnt1 + 1;
85           end loop;
86           close c1;
87           str:=str||' from '||TAR_TAB||';'||
88                ' r3 c3%rowtype; '||
89                ' begin '||
90                '   for r3 in c3 '||
91                '   loop '||
92                '     dbms_output.put_line(';
93           cnt1:=1;
94           open c1;
95           loop
96             fetch c1 into rec3;
97             exit when c1%notfound;
98             if cnt = cnt1 then
99                str:= str||' r3.'||rec3.column_name;
100             elsif cnt1<cnt then
101                str:= str||' r3.'||rec3.column_name||
102                     '||'',''||';
103                cnt1 := cnt1 + 1;
104             end if;
105           end loop;
106           close c1;
107           str:=str||');'||
108                ' end loop;'||
109                ' exception '||
110                '   when others then '||
111                '     dbms_output.put_line(sqlerrm); '||
112                ' end; ';
113     end if;
114     execute immediate(str);
115     --dbms_output.put_line(str);
116 exception
117    when others then
118      dbms_output.put_line(sqlerrm);
119* END;
120 /
Procedure created.
satyaki>
satyaki>
satyaki>
satyaki>create table emp_t
2     as
3       select * from emp
4       where rownum < 5;
Table created.
satyaki>
satyaki>
satyaki>desc emp;
Name                                      Null?    Type
EMPNO                                     NOT NULL NUMBER(4)
ENAME                                              VARCHAR2(10)
JOB                                                VARCHAR2(9)
MGR                                                NUMBER(4)
HIREDATE                                           DATE
SAL                                                NUMBER(7,2)
COMM                                               NUMBER(7,2)
DEPTNO                                             NUMBER(2)
satyaki>
satyaki>
satyaki>desc emp_t;
Name                                      Null?    Type
EMPNO                                              NUMBER(4)
ENAME                                              VARCHAR2(10)
JOB                                                VARCHAR2(9)
MGR                                                NUMBER(4)
HIREDATE                                           DATE
SAL                                                NUMBER(7,2)
COMM                                               NUMBER(7,2)
DEPTNO                                             NUMBER(2)
satyaki>set lin 1000
satyaki>
satyaki>select * from emp;
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
      7369 SMITH      CLERK           7902 17-DEC-80        800                    20
      7499 ALLEN      SALESMAN        7698 20-FEB-81       1600        300         30
      7521 WARD       SALESMAN        7698 22-FEB-81       1250        500         30
      7566 JONES      MANAGER         7839 02-APR-81       2975                    20
      7654 MARTIN     SALESMAN        7698 28-SEP-81       1250       1400         30
      7698 BLAKE      MANAGER         7839 01-MAY-81       2850                    30
      7782 CLARK      MANAGER         7839 09-JUN-81       2450                    10
      7788 SCOTT      ANALYST         7566 19-APR-87       3000                    20
      7839 KING       PRESIDENT            17-NOV-81       5000                    10
      7844 TURNER     SALESMAN        7698 08-SEP-81       1500          0         30
      7876 ADAMS      CLERK           7788 23-MAY-87       1100                    20
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
      7900 JAMES      CLERK           7698 03-DEC-81        950                    30
      7902 FORD       ANALYST         7566 03-DEC-81       3000                    20
      7934 MILLER     CLERK           7782 23-JAN-82       1300                    10
14 rows selected.
satyaki>
satyaki>
satyaki>select * from emp_t;
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
      7369 SMITH      CLERK           7902 17-DEC-80        800                    20
      7499 ALLEN      SALESMAN        7698 20-FEB-81       1600        300         30
      7521 WARD       SALESMAN        7698 22-FEB-81       1250        500         30
      7566 JONES      MANAGER         7839 02-APR-81       2975                    20
satyaki>
satyaki>
satyaki>set serveroutput on
satyaki>
satyaki>
satyaki>begin
2   compr_tab_dat('EMP_T','SCOTT','EMP','SCOTT');
3 end;
4 /
No matched columns found....
ORA-06535: statement string in EXECUTE IMMEDIATE is NULL or 0 length
PL/SQL procedure successfully completed.
satyaki>
satyaki>
satyaki>sho user;
USER is "TRG2"
satyaki>
satyaki>
satyaki>
satyaki>
satyaki>begin
2       compr_tab_dat('EMP_T','TRG2','EMP','TRG2');
3     end;
4      /
5 .
satyaki>
satyaki>ed
Wrote file afiedt.buf
1 begin
2       compr_tab_dat('EMP_T','TRG2','EMP','TRG2');
3* end;
satyaki>/
UnMatched Datas Are--
7654,MARTIN,SALESMAN,7698,28-SEP-81,1250,1400,30
7698,BLAKE,MANAGER,7839,01-MAY-81,2850,,30
7782,CLARK,MANAGER,7839,09-JUN-81,2450,,10
7788,SCOTT,ANALYST,7566,19-APR-87,3000,,20
7839,KING,PRESIDENT,,17-NOV-81,5000,,10
7844,TURNER,SALESMAN,7698,08-SEP-81,1500,0,30
7876,ADAMS,CLERK,7788,23-MAY-87,1100,,20
7900,JAMES,CLERK,7698,03-DEC-81,950,,30
7902,FORD,ANALYST,7566,03-DEC-81,3000,,20
7934,MILLER,CLERK,7782,23-JAN-82,1300,,10
PL/SQL procedure successfully completed.N.B.: May be Any other member can come with much shorter or better technique than this one. But, according to your requirement - i'm posting it. Hope this will help you, or atleast give you some idea.
Regards.
Satyaki De.

Open cursor for a dynamic query

Hi,
I'm using forms6i and db 10g
I want to create a procedure like below
     PROCEDURE pop_cursor (generic_cur IN OUT gencurtyp, querystring varchar2) IS
     BEGIN
          OPEN generic_cur FOR querystring;
     END;where generic_cur is a Ref Cursor and querystring will contain a query statement like 'select col1... from table1'
The above way i'm not able to do that, i'm getting error
Encountered the symbol 'QUERYSTRING' when expecting on of the following:
select
Is there any alternative??
Please help

You can only use that sort of dynamic sql in the database. maybe you can return the ref cursor to the form from a db-function, i don't know if it works in forms 6i.
But you could tell us your requirement, maybe you can implement it without these dynamic things.

Open cursor for string and select from partition (cannot bind)

Hi,
i don't manage to use a bind variable for a select ... from ... PARTITION(...).
It doesn't work to use something like
open cur for 'select ... from ... PARTITION(:1) where ...' using 'NDAY_20120301';So i have to create the cursor string with string functions each time i change the partition.
But that means, that the string changes each time.
Doesn't that prevent from re-use in library_cache?
best regards,
Frank

>
So i have to create the cursor string with string functions each time i change the partition.
But that means, that the string changes each time.
>
Yes it does.
Doesn't that prevent from re-use in library_cache?
>
Yes it does.
So why do you care? Unless you have large numbers of partitions what difference does it make? Bind variables are useful to keep Oracle from doing hard parses of queries that are basically the same but use different filter values. Such as an INSERT statement that uses different values FOR EACH ROW rather
You are just constructing the main (non-filter) part of the query one time and need a single value for the entire query regardless of how many rows - that isn't really a use case for bind variables and isn't going to provide any real benefit.
So the real question is why do you even care about something that wouldn't provide any benefit to you even if you could do it?
Looks like you just want to 'roll your own' parallel processing rather that use, and pay for, Oracle's parallel functionality.
If each partition uses its own tablespace you could filter on the FILE Id of the ROWIDs since the file number will be different for each tablespace and datafile.
1. Determine the list of file numbers for each partitions tablespace.
2. Use a WHERE DBMS_ROWID.ROWID_RELATIVE_FNO (ROWID) = :n filter (or use IN (:n1, :n2))to filter rows based on file number(s) for the partition you want
See DBMS_ROWID.ROWID_RELATIVE_FNO in the PL/SQL Packages and Types doc
http://docs.oracle.com/cd/B28359_01/appdev.111/b28419/d_rowid.htm#i1004259

OPEN cursor for large query

OPEN cursor
When you OPEN a cursor for a mult-row query, is there a straightforward way that you can have it only retrieve a limited number of rows at a time and then automatically delete those rows as you do the FETCH against them? I'm thinking of setting up multiple sequential cursors, and opening and closing them as the rows are processed. But I'm hoping there might be a better way.
The problem is that I'm running out of TEMPORARY during the OPEN cursor stage.
The application I am working on needs to work in Standard Edition and Personal Edition versions of Oracle.
Thank you.

Thanks - I had read the documentation before, but interpreted it differently.
What I had read was in:
http://download-east.oracle.com/docs/cd/B19306_01/appdev.102/b14261/sqloperations.htm#i45288
The extract of interest was:
Opening a Cursor
Opening the cursor executes the query and identifies the result set, which consists of all rows that meet the query search criteria. For cursors declared using the FOR UPDATE clause, the OPEN statement also locks those rows. An example of the OPEN statement follows:
DECLARE
CURSOR c1 IS SELECT employee_id, last_name, job_id, salary FROM employees
WHERE salary > 2000;
BEGIN
OPEN C1;
Rows in the result set are retrieved by the FETCH statement, not when the OPEN statement is executed.
My interpretation was that the result of the query was put into the temporary tablespace and then retrieved into the program during the FETCH.
Assuming I was wrong, what I'm wondering now is how I can possibly be running out of temporary space during this OPEN cursor process.

Open cursor for dynamic sql

Hi
I am using oracle 8.1.7 on solaris.
I have created
SQL> CREATE OR REPLACE PACKAGE TEST_PKG AS
2 TYPE row_cursor IS REF CURSOR RETURN TEMP_TAB%ROWTYPE;
3 PROCEDURE Return_Columns_proc (c_return IN OUT row_cursor);
4 END TEST_PKG;
5 /
Package created.
now i am trying to create the procedure Return_Columns_proc by
CREATE OR REPLACE PACKAGE BODY TEST_PKG AS
PROCEDURE Return_Columns_proc (c_return IN OUT row_cursor) AS
QUERY_STR VARCHAR2(850);
x number ;
BEGIN
x:=1;
QUERY_STR :='SELECT * FROM temp_tab where order_line_id = '||x;
OPEN c_return FOR QUERY_STR;
END Return_Columns_proc;
END TEST_PKG;
I am getting following error.
SQL> show error
Errors for PACKAGE BODY TEST_PKG:
LINE/COL ERROR
8/4 PL/SQL: Statement ignored
8/9 PLS-00455: cursor 'C_RETURN' cannot be used in dynamic SQL OPEN
statement
any help for this error.

The error says it all. You have defined a strong ref cursor and it cannot be used with dynamic sql. However, that does not mean you cannot use the query directly in the OPEN clause
OPEN c_Return FOR SELECT * FROM temp_tab where order_line_id = X ;

Open cursor for PLSQL table of records

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