PL SQL: How to populate a cursor in loop - oracle11g

I have a scenario to implement where in we will have an SP with two parameters
1) In parameter of array of Varchar2
2) Cursor -- Out parameter
We have populate the cursor only for each Value passed in array and this opened/populated cursor will be used by Java. But what i have found till now is, if we have to process an array then it should have to be done using loop.
For ex:
Open Cursor_Name
For
For index In Arrar_Parameter.FIRST .. Arrar_Parameter.LAST
LOOP
SELECT * FROM EMP WHERE EmpId = Arrar_Parameter[i] -------> This needs to be looped and not sure if this will work
END LOOP
Can we have some thing like this
Open Cursor_Name
For
SELECT * FROM EMP WHERE EmpId IN (Arrar_Parameter values) ------> To fetch/put all the array values at once without loop.
Kindly suggest hot to populate cursor in this scenario

Assuming your array parameter is a schema-level varray or nested table, you can use a table collection expression:
The table_collection_expression lets you inform Oracle that the value of collection_expression should be treated as a table for purposes of query and DML operations. The collection_expression can be a subquery, a column, a function, or a collection constructor. Regardless of its form, it must return a collection value—that is, a value whose type is nested table or varray. This process of extracting the elements of a collection is called collection unnesting.
This uses a built-in varray type but you can substitute your own:
create procedure procedure_name (
array_parameter sys.odcivarchar2list, cursor_name out sys_refcursor
) as
begin
open cursor_name for
select e.*
from table (array_parameter) a
join emp e on e.empid = a.column_value;
end;
/
You can also use in if you prefer:
create procedure procedure_name (
array_parameter sys.odcivarchar2list, cursor_name out sys_refcursor
) as
begin
open cursor_name for
select *
from emp
where empid in (select column_value from table (array_parameter));
end;
/
If it is a nested table you can also use the member of syntax:
create type my_varchar2_table as table of varchar2(30);
/
create procedure procedure_name (
array_parameter my_varchar2_table, cursor_name out sys_refcursor
) as
begin
open cursor_name for
select *
from emp
where empid member of array_parameter;
end;
/

Related

how to use collection type in PLSQL, while receiving multiple value from front end java page?

Actually my requirement is,am having 3 tables so i need to create type for each table or consolidate type to all table. but in java developer have to send the multiple parameter to my Procedure, so how to get the multiple values in single type and insert it into table??
Object type
CREATE OR REPLACE TYPE "POL_QUAT_TYPE"
IS OBJECT (V_POLICY_NO VARCHAR2 (30),
V_FOREIGN_POLICY VARCHAR2 (1));
tabletype
CREATE OR REPLACE TYPE POL_QUAT_table IS TABLE OF POL_QUAT_TYPE
Sample procedure
CREATE OR REPLACE PROCEDURE TEST1 (A POL_QUAT_TYPE) IS
B VARCHAR2(100);
C VARCHAR2(100);
BEGIN
B:=A(1);
C:=A(1);
INSERT INTO TEST ( PART, B )
VALUES (B,C);
COMMIT;
END;
Call this procedure
begin
test1('a','b');
end;
I want to know how get the value (a,b) though procedure from collection type.
Ok, you can insert the contents of an array of objects into the table like so:
CREATE OR REPLACE TYPE "POL_QUAT_TYPE"
IS OBJECT (V_POLICY_NO VARCHAR2 (30),
V_FOREIGN_POLICY VARCHAR2 (1));
/
CREATE OR REPLACE TYPE POL_QUAT_table IS TABLE OF POL_QUAT_TYPE;
/
CREATE OR REPLACE PROCEDURE TEST1 (p_a in POL_QUAT_table)
as
BEGIN
INSERT INTO TEST (PART, B)
select t.v_policy_no,
t.v_foreign_policy
from table(p_a) t;
COMMIT;
END;
/
I've created a test case to demonstrate that it works over on Oracle LiveSQL.
This means you can insert all the content of the array in one go without having to loop through the array and insert one record at a time, so it should be much more performant.

How to get value from nested table in pl sql table

I have created nested table as follow:
CREATE OR REPLACE TYPE EMP_NO_NAME
AS OBJECT
(
EMPNO NUMBER(4),
ENAME VARCHAR2(20),
JOB VARCHAR2(20),
MGR NUMBER(5),
HIREDATE DATE,
SAL NUMBER(7,2)
);
CREATE OR REPLACE TYPE EMP_TABLE IS TABLE OF EMP_NO_NAME;
-----------------------
CREATE TABLE NESTED_EMP
(
DEPTNO NUMBER(2) ,
EMPLOYEE EMP_TABLE
)
NESTED TABLE EMPLOYEE STORE AS NESTED_EMPLOYEE;
INSERT INTO NESTED_EMP (DEPTNO,EMPLOYEE)
VALUES (10,EMP_TABLE(EMP_NO_NAME(7839,'KING','PRESIDENT',NULL,'17-NOV-81',5000),
EMP_NO_NAME(7782,'CLARK','MANAGER',7839,'09-JUN-81',2450),
EMP_NO_NAME(7934,'MILLER','CLERK',7782,'23-JAN-82',1300)
)
);
INSERT INTO NESTED_EMP (DEPTNO,EMPLOYEE)
VALUES (20,EMP_TABLE(EMP_NO_NAME(7566,'JONES','MANAGER',7839,'02-APR-81',2975),
EMP_NO_NAME(7902,'FORD','ANALYST',7566,'03-DEC-81',3000),
EMP_NO_NAME(7369,'SMITH','CLERK',7902,'17-DEC-80',800),
EMP_NO_NAME(7788,'SCOTT','ANALYST',7566,'09-DEC-82',3000),
EMP_NO_NAME(7876,'ADAMS','CLERK',7788,'12-JAN-83',1100)
)
);
INSERT INTO NESTED_EMP (DEPTNO,EMPLOYEE)
VALUES (20,EMP_TABLE(EMP_NO_NAME(7698,'BLAKE','MANAGER',7839,'01-MAY-81',2850),
EMP_NO_NAME(7654,'MARTIN','SALESMAN',7698,'28-SEP-81',1250),
EMP_NO_NAME(7499,'ALLEN','SALESMAN',7698,'20-FEB-81',1600),
EMP_NO_NAME(7844,'TURNER','SALESMAN',7698,'08-SEP-81',1500),
EMP_NO_NAME(7900,'JAMES','CLERK',7698,'03-DEC-81',950),
EMP_NO_NAME(7521,'WARD','SALESMAN',7698,'22-FEB-81',1250)
)
);
Now I getting the value of nested table in plsql:
DECLARE
CURSOR EMPLOYEE IS
select p.* from NESTED_EMP p1 ,table(p1.employee) p;
V_EMP EMP_TABLE;
BEGIN
FOR V_EMP IN EMPLOYEE
LOOP
EXIT WHEN EMPLOYEE%NOTFOUND;
END LOOP;
FOR MYINDEX IN V_EMP.FIRST..V_EMP.LAST
LOOP
DBMS_OUTPUT.PUT_LINE(V_EMP(MYINDEX).ENAME);
END LOOP;
END;
/
END;
Error report:
ORA-06531: Reference to uninitialized collection ORA-06512: at line 10
06531. 00000 - "Reference to uninitialized collection"
*Cause: An element or member function of a nested table or varray
was referenced (where an initialized collection is needed)
without the collection having been initialized.
*Action: Initialize the collection with an appropriate constructor
or whole-object assignment.
How to get nested table value in plsql table ?
The problem with your code is that V_EMP is not actually of type EMP_TABLE. Rather, it's an EMPLOYEE.ROWTYPE. When you initialize a cursor for loop, the variable is automatically made an appropriate ROWTYPE, overriding any previous declarations.
The good news is that, since you've already referenced the nested table in the query, you don't need to do so in the loop (it's already been exploded). Your PL/SQL can be vastly simplified:
DECLARE
CURSOR employee IS
SELECT p.*
FROM nested_emp p1 CROSS JOIN TABLE (p1.employee) p;
BEGIN
FOR v_emp IN employee LOOP
DBMS_OUTPUT.put_line (v_emp.ename);
END LOOP;
END;
/
You'll notice the EXIT WHEN was removed as well. A cursor for loop terminates automatically after the last record.
An alternative would be to not explode the nested table in the query. Then you would need two loops:
DECLARE
CURSOR employee IS
SELECT p.*
FROM nested_emp p;
BEGIN
FOR v_emp IN employee LOOP
for i in v_emp.employee.first..v_emp.employee.last loop
DBMS_OUTPUT.put_line (v_emp.employee(i).ename);
end loop;
END LOOP;
END;
/

Convert stored proc to table to be able to use in select statement

I have to use existing stored procedure which returns REF CURSOR. I need to insert that resultset into a temporary table.
Spec of procedure is:
TYPE cur IS REF CURSOR;
PROCEDURE get(p_one NUMBER ,p_two OUT cur);
How can I insert the resultset of this procedure into a table.
I just re-read the title of your question. Do you actually need to be able to select from a procedure?
If so, this can be achieved by using pipelined functions.
The process for this is:
Create an object type to represent the record-type you require.
Create a nested table type of the object.
Create a pipelined function which returns the nest table.
You can then select from this function.
This example should get you on your way:
create or replace type to_test as object (
val1 varchar2(32),
val2 varchar2(32)
);
create or replace type tt_test as table of to_test;
create or replace function demo_pipe return tt_test pipelined
is
v_test to_test;
begin
for rec in (select * from user_tables) loop
v_test := to_test(rec.table_name, rec.tablespace_name);
pipe row (v_test);
end loop;
end;
/
select * from table(demo_pipe);

PlSql dynamic cursor Creation with input dynamic table name

Hi My PL/SQL function is
create or replace
PROCEDURE DiffrencesIdentifyerProc(db_nameFirst VARCHAR2,db_nameSecond VARCHAR2,table_name VARCHAR2) IS
dbremort varchar2(100):= db_nameFirst;
dblocal varchar2(100):= db_nameSecond;
tableName varchar2(100) := table_name;
CURSOR cur IS
SELECT * FROM s1.ENTITYFIELDS MINUS SELECT * FROM s2.ENTITYFIELDS;
BEGIN
FOR e IN cur
LOOP
dbms_output.put_line(e.ATTACH_NAME );
END LOOP;
END DiffrencesIdentifyerProc;
What I want is in
CURSOR cur IS
SELECT * FROM s1.ENTITYFIELDS MINUS SELECT * FROM s2.ENTITYFIELDS;
Select Part passed paramters to be setted like
SELECT * FROM dbremort.dbremort MINUS SELECT * FROM dbremort.dbremort ;
How can I do that???
Build/construct your query to a varchar2 (or clob when on Oracle 11g or newer) variable, then use native dynamic SQL's open for ... statement for opening the cursor and fetch statement for fetching from it.
Remember that you'll have to have a statically declared structure for fetching the data into from the cursor, anyway, so your dynamic queries will have to have identical number of selected columns with identical (or implicitly convertable) data types.

Select from PLSQL Associative array?

Is it possible to use SELECT FROM when using an associative array? I'm passing an array to a stored procedure through a .NET application, and I wanna be able to use that array as a condition when selecting from another table. Lets say I'm passing an array of IDs to the procedure, I wanna be able to do this:
select * from table1 where userID in (select column_value from array)
The type for the array is defined in the package:
type id_array is type of number index by pls_integer
Yes, it is possible, by wrapping the array with a pipelined function. Here's a good primer on pipelined functions:
http://www.oracle-developer.net/display.php?id=429
UPDATE: Oracle 12c now supports querying associative arrays using the TABLE operator, as long as the type is declared in a package spec: https://galobalda.wordpress.com/2014/08/02/new-in-oracle-12c-querying-an-associative-array-in-plsql-programs/
e.g.
select * from table1
where userID in (select column_value from table(array));
No, you can't select from PL/SQL arrays, since you use SQL in select from statements, though you can use DB defined Nested Tables types in SQL. This short article can help you get started.
Take a look a this simple synthetic exmple:
> create type temp_t as table of int;/
Type created.
> select 'test' from dual where 1 in (select * from table(temp_t(1,2,3)));
'TES
----
test
An example using PLSQL (to select from a nested table):
create type temp_r as OBJECT(
temp_varchar2 varchar2(100),
temp_number number(20)
);
/
create type temp_t as TABLE of temp_r;
/
set serveroutput on size 1000000
/
-- PLSQL starts here
declare
temp_rec temp_r := temp_r(null, null); -- empty constructor to initialize object
temp_table temp_t := temp_t(); -- empty constructor to initialize object
lv_ref_cursor SYS_REFCURSOR;
lv_temp_varchar2 varchar(100);
lv_temp_number number(20);
begin
temp_rec.temp_varchar2 := 'first';
temp_rec.temp_number := 1;
temp_table.extend;
temp_table(1) := temp_rec;
temp_table.extend;
temp_table(2) := temp_r('second', 2);
OPEN lv_ref_cursor FOR
SELECT temp_varchar2, temp_number
FROM table(temp_table)
where temp_number = 1;
fetch lv_ref_cursor into lv_temp_varchar2, lv_temp_number;
close lv_ref_cursor;
dbms_output.put_line('returns: ' || lv_temp_varchar2 || ', ' || lv_temp_number);
end;
/

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