sqlplus - using a bind variable in “IN” clause

问题

I am setting a bind variable in a PL/SQL block, and I'm trying to use it in another query's IN expression. Something like this:

variable x varchar2(255)

declare
    x varchar2(100);
begin
    for r in (select id from other_table where abc in ('&val1','&val2','&val3') ) loop
    x := x||''''||r.id||''',';
    end loop;
    --get rid of the trailing ','
    x:= substr(x,1,length(x)-1);

    select x into :bind_var from dual;
end;
/

print :bind_var;

select *
from some_table
where id in (:bind_var);

And I get an error (ORA-01722: Invalid number) on the query that tries to use the bind variable in the "IN" list.

The print statement yiels '123','345' which is what I expect.

Is it possible to use the bind variable like this or should I try a different approach?

(using Oracle 10g)

---

Clarification:

This is for a reconcilliation sort of thing. I want to run

select *
from some_table
where id in (select id from other_table where abc in ('&val1','&val2','&val3'))

before the main part of the script (not pictured here) deletes a whole bunch of records. I want to run it again afterwards to verify that records in some_table have NOT been deleted. However, the data in other_table DOES get deleted by this process so I can't just refer to the data in other_table because there's nothing there. I need a way to preserve the other_table.id values so that I can verify the parent records afterwards.

回答1:

I would store the other_table.id's in a PL/SQL table and reference that table in the query afterwards:

type t_id_table is table OF other_table.id%type index by binary_integer;
v_table t_id_table;

-- fill the table
select id
bulk collect into v_table
from other_table 
where abc in ('&val1','&val2','&val3');     

-- then at a later stage...    

select *
from some_table st
,    table(cast(v_table AS t_id_table)) idt
where st.id = idt.id;

回答2:

You can't use comma-separated values in one bind variable.

You could say:

select * from some_table where id in (:bind_var1, :bind_var2)

though

You're better off using something like:

select * from some_table where id in ("select blah blah blah...");

回答3:

I would use a global temporary table for this purpose

create global temporary table gtt_ids( id number ) ;

then

...
for r in (select id from other_table where ... ) loop
   insert into gtt_ids(id) values (r.id) ;
end loop;
...

and at the end

select *
from some_table
where id in (select id from gtt_ids);

回答4:

Ok, I have a kind of ugly solution that also uses substitution variables...

col idList NEW_VALUE v_id_list /* This is NEW! */
variable x varchar2(255)
declare
    x varchar2(100);
begin
    for r in (select id from other_table where abc in ('&val1','&val2','&val3') ) loop
    x := x||''''||r.id||''',';
    end loop;
    --get rid of the trailing ','
    x:= substr(x,1,length(x)-1);

    select x into :bind_var from dual;
end;
/

print :bind_var;

select :x idList from dual;  /* This is NEW! */

select *
from some_table
where id in (&idList);  /* This is CHANGED! */

It works, but I'll accept an answer from someone else if it's more elegant.

回答5:

changed the loop to use listagg (sadly this will only work in 11gr2).

but for the variable in list, I used a regular expression to accomplish the goal (but pre 10g you can use substr to do the same) this is lifted from the asktom question linked.

    variable bind_var varchar2(255)
variable dataSeperationChar varchar2(255)

declare
    x varchar2(100);
begin

select listagg(id,',')  within group(order by id) idList
into x
  from(select level id 
         from dual  
        connect by level < 100 ) 
where id in (&val1,&val2,&val3) ;
    select x into :bind_var from dual;
    :dataSeperationChar := ',';
end;
/

print :bind_var;

/



select *
  from (
        select level id2
          from dual
         connect by level < 100
        )
    where id2 in(
            select  -- transform the comma seperated string into a result set        
            regexp_substr(:dataSeperationChar||:bind_var||','
                        , '[^'||:dataSeperationChar||']+'
                      ,1
                      ,level)    as parsed_value
            from dual
            connect by level <= length(regexp_replace(:bind_var, '([^'||:dataSeperationChar||'])', '')) + 1    
    )
;

/*
values of 1,5, and 25

BIND_VAR
------
1,5,25

ID2                    
---------------------- 
1                      
5                      
25   
*/

---

EDIT

---

Oops just noticed that you did mark 10g, the only thing to do is NOT to use the listagg that I did at the start

来源：https://stackoverflow.com/questions/4973809/sqlplus-using-a-bind-variable-in-in-clause