Question

是否可以从批量收藏中进行选择？

这些方面的东西：

DECLARE
  CURSOR customer_cur IS
    SELECT CustomerId,
          CustomerName
    FROM   Customers
    WHERE  CustomerAreaCode = '576';

  TYPE customer_table IS TABLE OF customer_cur%ROWTYPE;
  my_customers  customer_table; 
BEGIN

  OPEN customer_cur;

  FETCH customer_cur
  BULK COLLECT INTO my_customers;

  -- This is what I would like to do
  SELECT CustomerName
    FROM my_customers
   WHERE CustomerId IN (1, 2, 3); 

END;

我似乎无法从the my_customers表中选择。

Answer 1

是的，你可以。声明自己的模式级类型如下：

create or replace rec_customer_cur
as
object (
    customerid       integer, -- change to the actual type of customers.customerid
    customername     varchar2(100) -- change to the actual type of customers.customername
);
/

create or replace type customer_table
as
table of rec_customer_cur;
/

然后，在您的PLSQL代码中，您可以声明

CURSOR customer_cur IS
SELECT new rec_customer_cur(CustomerId, CustomerName)
FROM   Customers
WHERE  CustomerAreaCode = '576';

...然后使用......

SELECT CustomerName
INTO whatever
FROM table(my_customers)
WHERE CustomerId IN (1, 2, 3);

这是因为在SQL上下文中可以使用模式级类型。

Answer 2

如果您还要显示select返回的数据集，请使用REF CURSOR作为OUT参数。

SELECT ...FROM TABLE是SQL语句，需要STATIC TABLE NAME作为database object。它会抛出一个错误，因为集合名称实际上不是一个数据库表作为对象。

要返回数据集，请使用SYS_REFCURSOR作为OUT参数。

open cur as select....

从批量集合中选择

2 个答案: