oracle - Getting an cursor as result when using begin and end block

Question

I'm trying to use the results of multiple slq statements for one result(cursor) in the firedac query editor:

Sql Command in editor

DECLARE
 MyVar1 varchar2(100);
 MyVar2 varchar2(100);

BEGIN
  SELECT USERINCDE INTO MyVar1 FROM P_USR WHERE USEREXCDE='PH1';
  SELECT USERINCDE INTO MyVar2 FROM P_USR WHERE USEREXCDE='PH2';
END;

SELECT MyVar1,MyVar2  AS TEST FROM DUAL

The above code wil not work as an select and begin and end block can not be combined. Has Anyone sugestions for a working code?

Answer 1

给定您的代码，我假设每个查询都返回一个且仅返回一个 value。

如果这是正确的，要获得所需的结果（1 行，2 列），您可以使用CROSS JOIN：

  SELECT V1.USERINCDE MyVar1, V2.USERINCDE MyVar2 FROM
    (SELECT USERINCDE FROM P_USR WHERE USEREXCDE='PH1') V1
  CROSS JOIN
    (SELECT USERINCDE FROM P_USR WHERE USEREXCDE='PH2') V2;

或者只是两个子查询：

  SELECT (SELECT USERINCDE FROM P_USR WHERE USEREXCDE='PH1') MyVar1,
         (SELECT USERINCDE FROM P_USR WHERE USEREXCDE='PH2') MyVar2 FROM DUAL

Answer 2

一般来说，这是一个奇怪的愿望。如果您希望从匿名块返回一些值，您应该执行以下操作：

BEGIN
  SELECT USERINCDE INTO :MyVar1 FROM P_USR WHERE USEREXCDE='PH1';
  SELECT USERINCDE INTO :MyVar2 FROM P_USR WHERE USEREXCDE='PH2';
END;

但是如果你非常非常需要使用游标，你可以这样做：

DECLARE
 MyVar1 varchar2(100);
 MyVar2 varchar2(100);
BEGIN
  SELECT USERINCDE INTO MyVar1 FROM P_USR WHERE USEREXCDE='PH1';
  SELECT USERINCDE INTO MyVar2 FROM P_USR WHERE USEREXCDE='PH2';
  OPEN :result FOR SELECT MyVar1, MyVar2 AS TEST FROM DUAL;
END;

在最后一种情况下，结果将是ref cursor。