VARRAY in action : Varray « Collections « Oracle PL/SQL Tutorial

Oracle PL/SQL Tutorial
1. Introduction
2. Query Select
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Oracle PL/SQL Tutorial » Collections » Varray 
26. 2. 4. VARRAY in action
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>
SQL>
SQL> declare
  2      type month_va is varray(13of VARCHAR2(20);
  3      v_month_va month_va;
  4      v_count_nr number;
  5  begin
  6      v_month_va:=month_va('January','February','March','April','May','June','July','August','September','October','November','December');
  7      DBMS_OUTPUT.put_line('Length:'||v_month_va.count);
  8
  9      v_month_va.extend;
 10      v_month_va(v_month_va.last):='Null';
 11      DBMS_OUTPUT.put_line('Length:'||v_month_va.count);
 12
 13      for i in v_month_va.first..v_month_va.last
 14      loop
 15          select count(*into v_count_nr from employee
 16          where nvl(replace(to_char(start_date,'Month'),' ')'Null')=v_month_va(i);
 17
 18          DBMS_OUTPUT.put_line(v_month_va(i)||': '||v_count_nr);
 19      end loop;
 20  end;
 21  /
Length:12
Length:13
January: 1
February: 0
March: 1
April: 0
May: 0
June: 0
July: 2
August: 0
September: 1
October: 1
November: 0
December: 2
Null: 0

PL/SQL procedure successfully completed.

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

Table dropped.
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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