甲骨文PLSQL返回一行類型

Question

嗨，我想創建一個只一行返回多個值功能：

create or replace TYPE foo_type AS OBJECT (
col1 NUMBER    , 
col2 VARCHAR2(150 BYTE) 
); 

CREATE FUNCTION foo_function() RETURN foo_type 
as 
row_type foo_type; 

select 
b1, -- NUMBER TYPE    
b2 -- VARCHAR2(150 BYTE) TYPE 
into 
row_type 
from 
table_xxx 
where 
rownum=1; --Only one row! 

return row_type; 

END foo_function; 

如果我編譯收到的：ORA-00947不夠值

我已經試過：

select 
b1, -- NUMBER TYPE    
b2 -- VARCHAR2(150 BYTE) TYPE 
into 
row_type.col1, 
row_type.col2 
from 
table_xxx 
where 
rownum=1; --Only one row! 

而且功能編譯但是當ID運行：

select foo_function() from dual; 

甲骨文回報：ORA-06530引用未初始化的複合

Answer 1

你將它定義爲在數據庫級對象，所以這個對象必須被初始化。

row_type := foo_type(null,null) 

但更恰當的解決方案在這裏將被改變選擇以下：

select 
foo_type(b1,b2) -- Create a foo_type from the select 
into 
row_type -- throw this initialized foo_type into your variable row_type 
from 
table_xxx 
where 
rownum=1; --Only one row! 

你可以做這一點與null值做你的選擇，如下之前初始化

Answer 2

select b1, b2 
into row_type 
from table_xxx 
where rownum=1; 

拋出ORA-00947 not enough values，因爲有兩個值b1和b2但只有一個變量請將row_type插入。

你可以這樣做：

CREATE FUNCTION foo_function() RETURN foo_type 
as 
    row_type foo_type; 
BEGIN      -- missing BEGIN 
    select foo_type (b1, b2) -- You need to put the values into a foo_type object 
    into row_type 
    from table_xxx 
    where rownum=1; 

    return row_type; 
END foo_function; 

或者：

CREATE FUNCTION foo_function() RETURN foo_type 
as 
    row_type foo_type := foo_type(NULL, NULL); -- Initialise the object. 
BEGIN 
    select b1,   b2 
    into row_type.col1, row_type.col2 
    from table_xxx 
    where rownum=1; 

    return row_type; 
END foo_function;