Question

我想使用这个简单的循环：

FOR indx IN 1 .. l_table_with_227_rows.COUNT

但不是使用1..row.count，而是要指定数组或列的下限和上限。示例：employee_ID [1] .. employee_ID [10] 请记住，我想通过滑动重复循环来更改它们接下来会的 employee_ID [11] .. employee_ID [20]

你知道这是否可能？我一直在寻找答案

谢谢，

Answer 1

是的，您可以使用数组的值来指定FOR循环的下限和上限值。

例如，假设我们有一个员工表，其数据如下：

create table EMPLOYEES (id number, name varchar2(20), title varchar2(30), salary number);

insert into EMPLOYEES values (1, 'Jim', 'App Specialist', 1000);
insert into EMPLOYEES values (2, 'Joseph', 'App Specialist', 2000);
insert into EMPLOYEES values (3, 'John', 'App Specialist', 3000);
insert into EMPLOYEES values (4, 'James', 'App Specialist', 4000);
insert into EMPLOYEES values (5, 'Jack', 'App Specialist', 5000);
insert into EMPLOYEES values (6, 'Jim', 'App Specialist', 1000);
insert into EMPLOYEES values (7, 'Joseph', 'App Specialist', 2000);
insert into EMPLOYEES values (8, 'John', 'App Specialist', 3000);
insert into EMPLOYEES values (9, 'James', 'App Specialist', 4000);
insert into EMPLOYEES values (10, 'Jack', 'App Specialist', 5000);
insert into EMPLOYEES values (11, 'Jim', 'App Specialist', 1000);
insert into EMPLOYEES values (12, 'Joseph', 'App Specialist', 2000);
insert into EMPLOYEES values (13, 'John', 'App Specialist', 3000);
insert into EMPLOYEES values (14, 'James', 'App Specialist', 4000);
insert into EMPLOYEES values (15, 'Jack', 'App Specialist', 5000);
insert into EMPLOYEES values (16, 'Jim', 'App Specialist', 1000);
insert into EMPLOYEES values (17, 'Joseph', 'App Specialist', 2000);
insert into EMPLOYEES values (18, 'John', 'App Specialist', 3000);
insert into EMPLOYEES values (19, 'James', 'App Specialist', 4000);
insert into EMPLOYEES values (20, 'Jack', 'App Specialist', 5000);
insert into EMPLOYEES values (21, 'Jim', 'App Specialist', 1000);
insert into EMPLOYEES values (22, 'Joseph', 'App Specialist', 2000);
insert into EMPLOYEES values (23, 'John', 'App Specialist', 3000);
insert into EMPLOYEES values (24, 'James', 'App Specialist', 4000);
insert into EMPLOYEES values (25, 'Jack', 'App Specialist', 5000);
commit;

以下过程包括FOR循环，它使用数组中的值（id_list）来指定绑定值。

create or replace procedure PRINT_EMPLOYEES
as
  cursor C_EMPLOYEES is
  select id, name, title, salary from EMPLOYEES ORDER BY id;
  type C_LIST is TABLE OF EMPLOYEES.id%type INDEX BY pls_integer;
  id_list C_LIST;
  COUNTER integer := 0;

begin
  DBMS_OUTPUT.PUT_LINE(sysdate);

  --Fill the array using values from cursor
  for EMP_REC in C_EMPLOYEES
  LOOP
    ID_LIST(COUNTER) := EMP_REC.id;
    COUNTER := COUNTER + 1;
  end loop;

  --Outer loop goes from 1 to 3
  for OUTER_COUNTER in 1..3
  LOOP
    DBMS_OUTPUT.PUT_LINE(ID_LIST(OUTER_COUNTER) || ' ~ ' || ID_LIST(OUTER_COUNTER+5));

    --Inner loop runs from id_list (outer_counter) to id_list(outer_counter + 5)
    for counter in id_list(OUTER_COUNTER)..id_list(OUTER_COUNTER+5)
    LOOP
      DBMS_OUTPUT.PUT_LINE(ID_LIST(COUNTER));
    end LOOP;
  END LOOP;

end;

<强>参考：

Associative Arrays on Oracle® Database PL/SQL Language Reference
CURSOR FOR LOOP on Tech on the Net
Working with Collections on Oracle Magazine Code Listing 2: Display all strings in a collection使用FOR循环中数组的第一个索引值和最后一个索引值（此示例显示了定义FOR循环限制的另一种方法）。

对于具有指定的下限和上限的循环Pl / SQL

1 个答案: