oracle - 批量收集到对象表中

Question

尝试使用 BULK COLLECT 时声明我收到错误 ORA-00947: not enough values .

一个示例脚本:

CREATE OR REPLACE 
TYPE company_t AS OBJECT ( 
   Company          VARCHAR2(30),
   ClientCnt            INTEGER   );
/

CREATE OR REPLACE 
TYPE company_set AS TABLE OF company_t;    
/

CREATE OR REPLACE 
FUNCTION piped_set (
  v_DateBegin IN DATE,
  v_DateEnd IN DATE
)
return NUMBER /*company_set pipelined*/ as
  v_buf company_t := company_t( NULL, NULL);
  atReport company_set;
  sql_stmt VARCHAR2(500) := '';
begin

select * BULK COLLECT INTO atReport
from (
   SELECT 'Descr1', 1 from dual
   UNION
   SELECT 'Descr2', 2 from dual ) ;

  return 1;
end;

错误发生在行 select * BULK COLLECT INTO atReport .

顺便说一句，直接 PL/SQL 工作正常(因此无需将其作为解决方案提及)。 BULK COLLECT的用法成用户表类型是个问题。

Answer 1

您的 company_set是一个对象表，您选择的是值，而不是由这些值组成的对象。这将编译:

select * BULK COLLECT INTO atReport
from (
   SELECT company_t('Descr1', 1) from dual
   UNION
   SELECT company_t('Descr2', 2) from dual ) ;

...但是运行时会抛出 ORA-22950: cannot ORDER objects without MAP or ORDER method因为 union隐式排序来识别和删除重复项，所以使用 union all反而:

select * BULK COLLECT INTO atReport
from (
   SELECT company_t('Descr1', 1) from dual
   UNION ALL
   SELECT company_t('Descr2', 2) from dual ) ;