VARRAY of Cursor : Varray « Collections « Oracle PL/SQL Tutorial

Oracle PL/SQL Tutorial
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Oracle PL/SQL Tutorial » Collections » Varray 
26. 2. 15. VARRAY of Cursor
SQL> -- create demo table
SQL> create table Employee(
  2    ID                 VARCHAR2(BYTE)         NOT NULL,
  3    First_Name         VARCHAR2(10 BYTE),
  4    Last_Name          VARCHAR2(10 BYTE),
  5    Start_Date         DATE,
  6    End_Date           DATE,
  7    Salary             Number(8,2),
  8    City               VARCHAR2(10 BYTE),
  9    Description        VARCHAR2(15 BYTE)
 10  )
 11  /

Table created.

SQL>
SQL> -- prepare data
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2               values ('01','Jason',    'Martin',  to_date('19960725','YYYYMMDD'), to_date('20060725','YYYYMMDD'), 1234.56'Toronto',  'Programmer')
  3  /

row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values('02','Alison',   'Mathews', to_date('19760321','YYYYMMDD'), to_date('19860221','YYYYMMDD'), 6661.78'Vancouver','Tester')
  3  /

row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values('03','James',    'Smith',   to_date('19781212','YYYYMMDD'), to_date('19900315','YYYYMMDD'), 6544.78'Vancouver','Tester')
  3  /

row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values('04','Celia',    'Rice',    to_date('19821024','YYYYMMDD'), to_date('19990421','YYYYMMDD'), 2344.78'Vancouver','Manager')
  3  /

row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values('05','Robert',   'Black',   to_date('19840115','YYYYMMDD'), to_date('19980808','YYYYMMDD'), 2334.78'Vancouver','Tester')
  3  /

row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
  2                values('06','Linda',    'Green',   to_date('19870730','YYYYMMDD'), to_date('19960104','YYYYMMDD'), 4322.78,'New York',  'Tester')
  3  /

row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
  2                values('07','David',    'Larry',   to_date('19901231','YYYYMMDD'), to_date('19980212','YYYYMMDD'), 7897.78,'New York',  'Manager')
  3  /

row created.

SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
  2                values('08','James',    'Cat',     to_date('19960917','YYYYMMDD'), to_date('20020415','YYYYMMDD'), 1232.78,'Vancouver', 'Tester')
  3  /

row created.

SQL>
SQL>
SQL>
SQL> -- display data in the table
SQL> select from Employee
  2  /


ID   FIRST_NAME LAST_NAME  START_DAT END_DATE      SALARY CITY       DESCRIPTION
---- ---------- ---------- --------- --------- ---------- ---------- ---------------
01   Jason      Martin     25-JUL-96 25-JUL-06    1234.56 Toronto    Programmer
02   Alison     Mathews    21-MAR-76 21-FEB-86    6661.78 Vancouver  Tester
03   James      Smith      12-DEC-78 15-MAR-90    6544.78 Vancouver  Tester
04   Celia      Rice       24-OCT-82 21-APR-99    2344.78 Vancouver  Manager
05   Robert     Black      15-JAN-84 08-AUG-98    2334.78 Vancouver  Tester
06   Linda      Green      30-JUL-87 04-JAN-96    4322.78 New York   Tester
07   David      Larry      31-DEC-90 12-FEB-98    7897.78 New York   Manager
08   James      Cat        17-SEP-96 15-APR-02    1232.78 Vancouver  Tester

rows selected.

SQL>
SQL> SET ECHO ON
SQL> SET SERVEROUTPUT ON
SQL>
SQL> DECLARE
  2      CURSOR all_emps IS
  3          SELECT *
  4          FROM employee
  5          ORDER BY first_name;
  6
  7      TYPE emp_array IS VARRAY(100OF employee%ROWTYPE;
  8
  9      emps emp_array;
 10      inx1 PLS_INTEGER;
 11      inx2 PLS_INTEGER;
 12  BEGIN
 13      inx1 := 0;
 14
 15      emps := emp_array ();
 16
 17      FOR emp IN all_emps LOOP
 18          inx1 := inx1 + 1;
 19          emps.extend();
 20          emps(inx1).id := emp.id;
 21          emps(inx1).first_name := emp.first_name;
 22          emps(inx1).salary := emp.salary;
 23      END LOOP;
 24
 25      FOR inx2 IN 1..emps.count LOOP
 26          DBMS_OUTPUT.PUT_LINE (emps(inx2).id ||' ' || emps(inx2).first_name);
 27      END LOOP;
 28  END;
 29  /
02 Alison
04 Celia
07 David
03 James
08 James
01 Jason
06 Linda
05 Robert

PL/SQL procedure successfully completed.

SQL>
SQL>
SQL>
SQL>
SQL> -- clean the table
SQL> drop table Employee
  2  /

Table dropped.

SQL>
SQL>
26. 2. Varray
26. 2. 1. Creating a Varray Type
26. 2. 2. Using VARRAYs
26. 2. 3. Getting Information on Varrays
26. 2. 4. VARRAY in action
26. 2. 5. Inside the loop, you are accessing array elements by their subscripts.
26. 2. 6. Assign value to VARRAY
26. 2. 7. Defining our type to be a VARRAY with 10 elements, where each element is a varying character string of up to 15 characters.
26. 2. 8. CREATE TABLE with a VARRAY
26. 2. 9. Loading a Table with a VARRAY in It: INSERT VALUEs with Constants
26. 2. 10. Query VARRAY column
26. 2. 11. Query table with VARRAY type column by column name
26. 2. 12. Manipulating the VARRAY with The TABLE Function
26. 2. 13. If aliases are used, they must be used consistently
26. 2. 14. Manipulating the VARRAY with The VARRAY Self-join
26. 2. 15. VARRAY of Cursor
26. 2. 16. The COUNT Function
26. 2. 17. LAST and COUNT give the same result for VARRAYs.
26. 2. 18. A procedure that uses EXISTS and LAST
26. 2. 19. EXISTS and LAST
26. 2. 20. Using PL/SQL to Create Functions to Access Elements
26. 2. 21. The CAST function converts an object type (such as a VARRAY) into a common type that can be queried. Oracle 10g automatically converts the VARRAY without the CAST.
26. 2. 22. One way to make the 'members' behave like an array is first to include the row number in the result set like this:
26. 2. 23. Then, the individual array element can be extracted with a WHERE filter:
26. 2. 24. Extracting individual members of a VARRAY may be accomplished using two other functions: THE and VALUE
26. 2. 25. Column_value is a built-in function/pseudo-variable that is held over from the DBMS_SQL package
26. 2. 26. Loop through by using the built-in NEXT, PRIOR.
26. 2. 27. The subscript of the last element is always equal to the size of the array.
26. 2. 28. Decreasing the Size of an Array
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