[英]Oracle How to Dynamicaly change argument/parameter in function with loop
How to dynamicaly change argument/parameter in pipeline function with loop?如何使用循环动态更改管道函数中的参数/参数? Here is the example.
这是示例。
CREATE OR REPLACE FUNCTION TESTES(
P_VALUE1 VARCHAR2,
P_VALUE2 VARCHAR2,
P_VALUE3 VARCHAR2
)RETURN VARCHAR2
PIPELINED
AS
L_DYNM VARCHAR2(1000);
L_QUERY VARCHAR2(1000);
L_RETURN VARCHAR2(1000);
BEGIN
FOR i IN 1..3 LOOP
L_DYNM := 'P_VALUE' || i || ',';
END LOOP;
L_QUERY := 'SELECT' || L_DYNM ||'FROM DUAL';
/* SELECT SME_PACE.SYS_REGEX_DEBIT(P_VALUE) INTO L_RETURN FROM DUAL; */
FOR V_REC IN (
EXECUTE IMMEDIATE L_QUERY
INTO L_RETURN
)
LOOP
PIPE ROW (
OBJECT_TESTES(
V_REC.FIELD1, V_REC.FIELD2, V_REC.FIELD3
);
END LOOP;
END;
So what i want to try to do actually is run SELECT P_VALUE1, P_VALUE2, P_VALUE3 From dual Dynamically and use it on pipeline row.所以我实际上想要尝试做的是从双动态运行SELECT P_VALUE1, P_VALUE2, P_VALUE3并在管道行上使用它。
Theres a reason why i have to do it like that, i need an answer is it possible doing it like this?我必须这样做是有原因的,我需要一个答案是否可以这样做? so i can apply it on my project.
所以我可以将它应用到我的项目中。
Thanks谢谢
You have lots of inconsistencies in your function:您的功能有很多不一致之处:
VARCHAR2
but you are trying to use a PIPELINE
that would return a collection.VARCHAR2
但您正在尝试使用将返回集合的PIPELINE
。L_DYNM
each iteration of the loop.L_DYNM
的值。DUAL
table when it only has a single DUMMY
column.DUAL
表只有一个DUMMY
列时,您正试图从DUAL
表中选择三个动态列名。 Then you have syntax errors:然后你有语法错误:
EXECUTE IMMEDIATE
inside a FOR
statement.FOR
语句中EXECUTE IMMEDIATE
。 You probably want something like:你可能想要这样的东西:
CREATE TYPE object_testes IS OBJECT(
a VARCHAR2(100),
b VARCHAR2(100),
c VARCHAR2(100)
);
CREATE TYPE object_testes_table IS TABLE OF object_testes;
CREATE OR REPLACE FUNCTION TESTES(
P_VALUE1 VARCHAR2,
P_VALUE2 VARCHAR2,
P_VALUE3 VARCHAR2
) RETURN object_testes_table PIPELINED
AS
p_cur SYS_REFCURSOR;
p_sql VARCHAR2(4000);
p_field1 VARCHAR2(100);
p_field2 VARCHAR2(100);
p_field3 VARCHAR2(100);
BEGIN
p_sql := 'SELECT ' || DBMS_ASSERT.ENQUOTE_NAME( p_value1 ) || ', '
|| DBMS_ASSERT.ENQUOTE_NAME( p_value2 ) || ', '
|| DBMS_ASSERT.ENQUOTE_NAME( p_value3 ) || ' '
|| 'FROM DUAL';
OPEN p_cur FOR p_sql;
LOOP
FETCH p_cur INTO p_field1, p_field2, p_field3;
EXIT WHEN p_cur%NOTFOUND;
PIPE ROW (
OBJECT_TESTES(
p_field1,
p_field2,
p_field3
)
);
END LOOP;
CLOSE p_cur;
END;
/
Then:然后:
SELECT * FROM TABLE( testes( 'DUMMY', 'DUMMY', 'DUMMY' ));
Outputs:输出:
\nA |一个 | B |
乙 | C
C \n:- |
:- | :- |
:- | :-
:-\nX |
X | X |
X | X
X \n
Try the following way.试试下面的方法。 This will do the same thing but without using
select P_Value1 dual
.这将做同样的事情,但不使用
select P_Value1 dual
。
Create Object:创建对象:
CREATE TYPE sample_record AS OBJECT (P_VALUE1 VARCHAR2(10),
P_VALUE2 VARCHAR2(10),
P_VALUE3 VARCHAR2(10)
);/
Then Create array of created object.然后创建创建对象的数组。
CREATE TYPE sample_records IS TABLE OF sample_record; /
Function to convert object into Pipe Row:将对象转换为管道行的函数:
CREATE OR REPLACE FUNCTION test (P_VALUE1 VARCHAR2,P_VALUE2 VARCHAR2,P_VALUE3 VARCHAR2)
RETURN sample_records PIPELINED AS
BEGIN
PIPE ROW(sample_record(P_VALUE1,P_VALUE2,P_VALUE3));
RETURN;
END;
/
Then call the above function in the following way.然后按照下面的方式调用上面的函数。 You call it in the loop also:
您也可以在循环中调用它:
select * from table(test('A','B','C'));
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