arrays - 值为数组的 Oracle pl/sql 映射

Question

我需要创建关联数组，其中键是 VARCHAR(20)，值是 varchars 数组。
例如:

customer_by_locations: {
   "London": {
               "John Doe", "Samantha Simpson", "Nicolas Darcula"
             },
   "Stambul": {
               "Abdula Ibn Rahim", "Another Abdula"
             }
}

我创建了查询:

declare 
  type customers is varray(10) of varchar2(20);
  type locations is table of customers index by varchar2(20);

  list_locations locations;
  list_customers varchar(20);
begin
  list_locations('London') := ("John Doe", "Samantha Simpson", "Nicolas Darcula");
  list_locations('Stambul') := ("Abdula Ibn Rahim", "Another Abdula");

  for i in 1 .. list_locations loop
    DBMS_OUTPUT.PUT_LINE('Total ' || list_locations(i));   
    //Something do 
  end loop;  
end; 

但我有错误

PLS-00382: expression is of wrong type

请告诉我，我将如何将数组声明为值并在 oracle pl/sql 中为其分配值。

Answer 1

declare 
  type customers is varray(10) of varchar2(20);
  type locations is table of customers index by varchar2(20);

  list_locations locations;
  list_customers varchar(20);
  v_location varchar2(20);
begin
  list_locations('London') := customers('John Doe', 'Samantha Simpson', 'Nicolas Darcula');
  list_locations('Stambul') := customers('Abdula Ibn Rahim', 'Another Abdula');

  v_location := list_locations.first;
  loop
    exit when v_location is null;

    for i in 1 .. list_locations(v_location).count loop
      dbms_output.put_line(v_location||': '||list_locations(v_location)(i));
    end loop;

    v_location := list_locations.next(v_location);
  end loop;
end; 
/