Oracle PL / SQL-간단한 배열 변수를 만드는 방법은 무엇입니까?

Oracle PL / SQL-간단한 배열 변수를 만드는 방법은 무엇입니까?

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PL / SQL 코드에서 사용할 수있는 메모리 내 배열 변수를 만들고 싶습니다. 순수 메모리를 사용하는 Oracle PL / SQL의 컬렉션을 찾을 수 없으며 모두 테이블과 관련이있는 것 같습니다. PL / SQL (C # 구문)에서 이와 같은 작업을 수행하려고합니다.

string[] arrayvalues = new string[3] {"Matt", "Joanne", "Robert"};

편집 : Oracle : 9i

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고정 크기 배열에 VARRAY를 사용할 수 있습니다.

declare
   type array_t is varray(3) of varchar2(10);
   array array_t := array_t('Matt', 'Joanne', 'Robert');
begin
   for i in 1..array.count loop
       dbms_output.put_line(array(i));
   end loop;
end;

무한 배열의 경우 TABLE :

...
   type array_t is table of varchar2(10);
...

여기서 "테이블"이라는 단어는 혼란스럽게 데이터베이스 테이블과 관련이 없습니다. 두 방법 모두 메모리 내 배열을 만듭니다.

이 중 하나를 사용하면 요소를 추가하기 전에 컬렉션을 초기화하고 확장해야합니다.

declare
   type array_t is varray(3) of varchar2(10);
   array array_t := array_t(); -- Initialise it
begin
   for i in 1..3 loop
      array.extend(); -- Extend it
      array(i) := 'x';
   end loop;
end;

첫 번째 인덱스는 0이 아닌 1입니다.

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BINARY_INTEGER에 의해 색인화 된 메모리 내 변수 길이 배열을 보유하도록 DBMS_SQL.VARCHAR2_TABLE을 선언 할 수 있습니다.

DECLARE
   name_array dbms_sql.varchar2_table;
BEGIN
   name_array(1) := 'Tim';
   name_array(2) := 'Daisy';
   name_array(3) := 'Mike';
   name_array(4) := 'Marsha';
   --
   FOR i IN name_array.FIRST .. name_array.LAST
   LOOP
      -- Do something
   END LOOP;
END;

You could use an associative array (used to be called PL/SQL tables) as they are an in-memory array.

DECLARE
   TYPE employee_arraytype IS TABLE OF employee%ROWTYPE
        INDEX BY PLS_INTEGER;
   employee_array employee_arraytype;
BEGIN
   SELECT *
     BULK COLLECT INTO employee_array
     FROM employee
    WHERE department = 10;
   --
   FOR i IN employee_array.FIRST .. employee_array.LAST
   LOOP
      -- Do something
   END LOOP;
END;

The associative array can hold any make up of record types.

Hope it helps, Ollie.

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Another solution is to use an Oracle Collection as a Hashmap:

declare 
-- create a type for your "Array" - it can be of any kind, record might be useful
  type hash_map is table of varchar2(1000) index by varchar2(30);
  my_hmap hash_map ;
-- i will be your iterator: it must be of the index's type
  i varchar2(30);
begin
  my_hmap('a') := 'apple';
  my_hmap('b') := 'box';
  my_hmap('c') := 'crow';
-- then how you use it:

  dbms_output.put_line (my_hmap('c')) ;

-- or to loop on every element - it's a "collection"
  i := my_hmap.FIRST;

  while (i is not null)  loop     
    dbms_output.put_line(my_hmap(i));      
    i := my_hmap.NEXT(i);
  end loop;

end;

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You can also use an oracle defined collection

DECLARE 
  arrayvalues sys.odcivarchar2list;
BEGIN
  arrayvalues := sys.odcivarchar2list('Matt','Joanne','Robert');
  FOR x IN ( SELECT m.column_value m_value
               FROM table(arrayvalues) m )
  LOOP
    dbms_output.put_line (x.m_value||' is a good pal');
  END LOOP;
END;

I would use in-memory array. But with the .COUNT improvement suggested by uziberia:

DECLARE
  TYPE t_people IS TABLE OF varchar2(10) INDEX BY PLS_INTEGER;
  arrayvalues t_people;
BEGIN
  SELECT *
   BULK COLLECT INTO arrayvalues
   FROM (select 'Matt' m_value from dual union all
         select 'Joanne'       from dual union all
         select 'Robert'       from dual
    )
  ;
  --
  FOR i IN 1 .. arrayvalues.COUNT
  LOOP
    dbms_output.put_line(arrayvalues(i)||' is my friend');
  END LOOP;
END;

Another solution would be to use a Hashmap like @Jchomel did here.

NB:

With Oracle 12c you can even query arrays directly now!

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Sample programs as follows and provided on link also https://oracle-concepts-learning.blogspot.com/

plsql table or associated array.

        DECLARE 
            TYPE salary IS TABLE OF NUMBER INDEX BY VARCHAR2(20); 
            salary_list salary; 
            name VARCHAR2(20); 
        BEGIN 
           -- adding elements to the table 
           salary_list('Rajnish') := 62000; salary_list('Minakshi') := 75000; 
           salary_list('Martin') := 100000; salary_list('James') := 78000; 
           -- printing the table name := salary_list.FIRST; WHILE name IS NOT null 
            LOOP 
               dbms_output.put_line ('Salary of ' || name || ' is ' || 
               TO_CHAR(salary_list(name))); 
               name := salary_list.NEXT(name); 
            END LOOP; 
        END; 
        /

참고URL : https://stackoverflow.com/questions/7012625/oracle-pl-sql-how-to-create-a-simple-array-variable