Question

我需要将数据附加到已填充的对象类型。要追加的数据取决于已在对象类型中填充的数据。任何人都可以帮我这个。

我尝试了下面的方法，这是正常的。但我想知道是否有更好的方法。

步骤1：声明并填充对象类型1
步骤2：声明另一个对象类型2并使用对象类型1填充它
步骤3：为最终结果集再声明一个对象类型3，并使用对象类型1和对象类型2的组合数据填充

另外我需要为每个填充的记录分配uniq id（我正在使用 rownum 伪列）

以下是我尝试的代码，它工作正常。请注意，在实际需求中，我在对象类型中有许多属性，并且在填充对象类型时有许多过滤器和连接。以下是了解解决方案的简化代码。

-- table EMPLOYEE
CREATE TABLE EMPLOYEE
(
     ENAME          VARCHAR2(128)  ,
     EADDRESS       VARCHAR2(200)  ,
     ESTATUS        VARCHAR2(11)   ,
     PARENT_NAME    VARCHAR2(128)   
);

-- Object
CREATE OR REPLACE TYPE OBJ_USER_ACTIVITIES AS OBJECT
(
     UNIQ_ID        NUMBER(9)      ,
     EMPNAME        VARCHAR2(128)  ,
     ADDRESS        VARCHAR2(200)  ,
     STATUS         VARCHAR2(11)   ,
     PARENT_NAME    VARCHAR2(128)            
);

-- Type
CREATE OR REPLACE TYPE TAB_USER_ACTIVITIES IS TABLE OF OBJ_USER_ACTIVITIES;

-- Procedure
CREATE OR REPLACE PROCEDURE Test_Tickets
IS 
     TEMP_USER_ACTIVITIES_1        TAB_USER_ACTIVITIES := TAB_USER_ACTIVITIES();
     TEMP_USER_ACTIVITIES_2        TAB_USER_ACTIVITIES := TAB_USER_ACTIVITIES();
     TEMP_USER_ACTIVITIES_FINAL    TAB_USER_ACTIVITIES := TAB_USER_ACTIVITIES();

     i integer;

BEGIN

     -- First resultset
     SELECT OBJ_USER_ACTIVITIES
     (ROWNUM, EMPNAME, ADDRESS, STATUS, PARENT_NAME)
     BULK COLLECT INTO TEMP_USER_ACTIVITIES_1
     FROM
     (
          SELECT    ENAME AS EMPNAME, EADDRESS AS ADDRESS, ESTATUS AS STATUS, PARENT_NAME
          FROM      EMPLOYEE
          --WHERE   SOME FILTER
     );

     i := TEMP_USER_ACTIVITIES_1.COUNT;

     -- Build second resultset depending on valus of first resultset
     SELECT OBJ_USER_ACTIVITIES
     ( i + ROWNUM, EMPNAME, ADDRESS, STATUS, PARENT_NAME )
     BULK COLLECT INTO TEMP_USER_ACTIVITIES_2
     FROM
     (
          SELECT    ENAME AS EMPNAME, EADDRESS AS ADDRESS, ESTATUS AS STATUS, PARENT_NAME
          FROM      EMPLOYEE
          WHERE     ENAME IN ( SELECT PARENT_NAME FROM TABLE(TEMP_USER_ACTIVITIES_1) WHERE PARENT_NAME IS NOT NULL )           
     );


     -- FINAL resultset combining above two resulset
     SELECT OBJ_USER_ACTIVITIES
     ( UNIQ_ID, EMPNAME, ADDRESS, STATUS, PARENT_NAME )
     BULK COLLECT INTO TEMP_USER_ACTIVITIES_FINAL
     FROM
     (
          SELECT    UNIQ_ID, EMPNAME, ADDRESS, STATUS, PARENT_NAME
          FROM      TABLE(TEMP_USER_ACTIVITIES_1)
          UNION
          SELECT    UNIQ_ID, EMPNAME, ADDRESS, STATUS, PARENT_NAME
          FROM      TABLE(TEMP_USER_ACTIVITIES_2)
     );

END;

Answer 1

为此，您可以使用一组很好的嵌套表运算符。 HEre就是一个例子（其他一些运营商只是为了完整而注释掉了）

SQL> create or replace type MY_OBJ as object ( x int, y int );
  2  /

Type created.

SQL>
SQL> create or replace type MY_OBJ_LIST as table of my_obj
  2  /

Type created.

SQL>
SQL> set serverout on
SQL> declare
  2    t1 my_obj_list :=
  3      my_obj_list(
  4        my_obj(1,2),
  5        my_obj(3,4),
  6        my_obj(5,6));
  7
  8    t2 my_obj_list :=
  9      my_obj_list(
 10        my_obj(7,8),
 11        my_obj(9,10),
 12        my_obj(11,12));
 13
 14    t3  my_obj_list := my_obj_list();
 15  begin
 16   t3 :=  t1 MULTISET UNION t2;
 17
 18   dbms_output.put_line('I now have '||t3.count||' elements');
 19
 20  --  t3 := t1 multiset union t2;
 21  --  t3 := t1 multiset union distinct t2;
 22  --  t3 := t1 multiset intersect t2;
 23  --  t3 := t1 multiset intersect distinct t2;
 24  --  t3 := set(t2);
 25  --  t3 := t1 multiset except t2;
 26  --  t3 := t1 multiset except distinct t2;
 27
 28  end;
 29  /
I now have 6 elements

PL/SQL procedure successfully completed.

来自其他对象类型oracle

1 个答案: