Oracle PL/SQL-如何创建一个简单的数组变量?

问题描述

我想创建一个内存数组变量，该变量可以在我的PL/SQL代码中使用.我在Oracle PL/SQL中找不到使用纯内存的任何集合，它们似乎都与表相关联.我想在我的PL/SQL(C#语法)中做类似的事情:

I'd like to create an in-memory array variable that can be used in my PL/SQL code. I can't find any collections in Oracle PL/SQL that uses pure memory, they all seem to be associated with tables. I'm looking to do something like this in my PL/SQL (C# syntax):

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

修改:甲骨文:9i

推荐答案

您可以将VARRAY用于固定大小的数组:

You can use VARRAY for a fixed-size array:

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;

或者使用TABLE表示无界数组:

Or TABLE for an unbounded array:

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

这里的表"一词与数据库表无关，令人困惑.两种方法都创建内存数组.

The word "table" here has nothing to do with database tables, confusingly. Both methods create in-memory arrays.

使用这两种方法之一，您都需要在添加元素之前初始化和扩展集合:

With either of these you need to both initialise and extend the collection before adding elements:

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;

第一个索引是1而不是0.

The first index is 1 not 0.

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