PL/SQL 批量收集到具有稀疏键的关联数组中

PL/SQL bulk collect into associative array with sparse key(PL/SQL 批量收集到具有稀疏键的关联数组中)

问题描述

我想在 PL/SQL 中执行 SQL 查询并将结果填充到关联数组中，其中 SQL 中的列之一成为关联数组中的键.例如，假设我有一个带有列的表 Person

I want to execute a SQL query inside PL/SQL and populate the results into an associative array, where one of the columns in the SQL becomes the key in the associative array. For example, say I have a table Person with columns

PERSON_ID   INTEGER      PRIMARY KEY
PERSON_NAME VARCHAR2(50)

...以及如下值:

 PERSON_ID  |  PERSON_NAME
 ------------------------
 6          |  Alice
 15         |  Bob
 1234       |  Carol

我想将该表批量收集到 TABLE OF VARCHAR2(50) INDEX BY INTEGER 中，这样关联数组中的键 6 的值为 爱丽丝 等等.这可以在 PL/SQL 中完成吗?如果是，怎么办?

I want to bulk collect this table into a TABLE OF VARCHAR2(50) INDEX BY INTEGER such that the key 6 in this associative array has the value Alice and so on. Can this be done in PL/SQL? If so, how?

推荐答案

不，您必须使用 2 个集合(id、名称)或元素类型为记录的集合.

No, you have to use either 2 collections (id, name) or one whose element type is a record.

以下是后者的示例:

  cursor getPersonsCursor is
    SELECT ID, Name
    FROM   Persons
    WHERE  ...;

  subtype TPerson is getPersonsCursor%rowtype;
  type TPersonList is table of TPerson;
  persons TPersonList;
begin

open getPersonsCursor;
fetch getPersonsCursor
  bulk collect into persons;
close getPersonsCursor;

if persons.Count > 0 then
  for i in persons.First .. persons.Last loop
    yourAssocArray(persons(i).ID) := persons(i).Name;
  end loop;
end if;

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