我的页面P3_Checkbox1
上有一个从数据库填充的复选框。如何在PL / SQL代码中遍历复选框的所有选中值?
我假设APEX_APPLICATION.G_F01
仅由sql生成的复选框使用,并且我不能将其用于常规checbox,因为它不会填充G_Fxx数组。
答案 0 :(得分:1)
我想我现在明白您的意思了。
例如,假设P3_CHECKBOX1
复选框项允许3个值(显示/返回):
我创建了一个按钮(将仅SUBMIT
页)和两个文本项,这些文本项将显示选中的值:P3_CHECKED_VALUES
和P3_CHECKED_VALUES_2
。
然后我创建了一个进程,当按下按钮时会触发该进程。该过程如下所示(请同时阅读评论):
begin
-- This is trivial; checked (selected) values are separated by a colon sign,
-- just like in a Shuttle item
:P3_CHECKED_VALUES := :P3_CHECKBOX1;
-- This is what you might be looking for; it uses the APEX_STRING.SPLIT function
-- which splits selected values (the result is ROWS, not a column), and these
-- values can then be used in a join or anywhere else, as if it was result of a
-- subquery. The TABLE function is used as well.
-- LISTAGG is used just to return a single value so that I wouldn't have to worry
-- about TOO-MANY-ROWS error.
with
description (code, descr) as
(select -1, 'Absent' from dual union all
select 0 , 'Unknown' from dual union all
select 1 , 'Here' from dual),
desc_join as
(select d.descr
from description d join (select * from table(apex_string.split(:P3_CHECKED_VALUES, ':'))) s
on d.code = s.column_value
)
select listagg(j.descr, ' / ') within group (order by null)
into :P3_CHECKED_VALUES_2
from desc_join j;
end;
假设已检查“缺勤”和“未知”值。该PL / SQL过程的结果是:
P3_CHECKED_VALUES = -1:0
P3_CHECKED_VALUES_2 = Absent / Unknown
您可以根据需要重写它;这只是一个例子。
关键字:
APEX_STRING.SPLIT
TABLE
函数希望对您有帮助。
[编辑:遍历所选值]
遍历这些值并不困难;您可以按照以下步骤进行操作(请参见光标FOR
循环):
declare
l_dummy number;
begin
for cur_r in (select * From table(apex_string.split(:P3_CHECKED_VALUES, ':')))
loop
select max(1)
into l_dummy
from some_table where some_column = cur_r.column_value;
if l_dummy is null then
-- checked value does not exist
insert into some_table (some_column, ...) valued (cur_r.column_value, ...);
else
-- checked value exists
delete from some_table where ...
end if;
end loop;
end;
但是,我不确定您说“数据库中存在特定组合”是什么意思。这是否意味着您要将冒号分隔的值存储到该表的列中?如果是这样,则上面的代码也不起作用,因为您进行了比较,例如
-1
至0:-1
,然后0
至0:-1
这不是真的(在最简单的情况下,当检查和存储的值只有一个值时除外)。
尽管Apex的“多项选择”看起来不错,但当您必须实际与他们进行某些事情时(例如您的情况),它们可能会成为噩梦。
也许您应该先 sort 复选框值,对数据库值进行排序,然后比较这两个字符串。
这意味着LISTAGG
可能再次变得方便,例如
listagg(j.descr, ' / ') within group (order by j.descr)
数据库值可以按以下方式排序:
SQL> with test (col) as
2 (select '1:0' from dual union all
3 select '1:-1:0' from dual
4 ),
5 inter as
6 (select col,
7 regexp_substr(col, '[^:]+', 1, column_value) token
8 from test,
9 table(cast(multiset(select level from dual
10 connect by level <= regexp_count(col, ':') + 1
11 ) as sys.odcinumberlist))
12 )
13 select
14 col source_value,
15 listagg(token, ':') within group (order by token) sorted_value
16 from inter
17 group by col;
SOURCE SORTED_VALUE
------ --------------------
1:-1:0 -1:0:1
1:0 0:1
SQL>
将它们都排序后,就可以比较它们,并INSERT
或DELETE
行进行比较。