Hi Igor/Keith,
I tried with both queries. I expect to delete all rows belongs to key 1.
But not deleted. Am I missing something while writing queries?
delete from emp where key = 1 and (name='' or name='f');
DELETE FROM emp WHERE key = 1 AND (name IS NULL OR name = 'f');
-------------------------------------------------------------------------------------------------------------
create table if not exists emp(key integer not null, name text not null ,
personaldata text not null, unique(key, name));
insert into emp (key, name, personaldata) values(1, 'a', 'z');
insert into emp (key, name, personaldata) values(1, 'b', 'zz');
insert into emp (key, name, personaldata) values(2, 'c', 'y');
insert into emp (key, name, personaldata) values(3, 'd', 'yy');
insert into emp (key, name, personaldata) values(1, 'e', 'yyy');
--------------------------------------------------------------------------------------------------------------
On Mon, Nov 18, 2013 at 5:20 PM, d b <va230...@gmail.com> wrote:
> Thanks RSmith.
>
> It works.
>
> But, I am looking for single query for prepared statements. That's the
> actual struggle for me.
>
>
> On Mon, Nov 18, 2013 at 4:24 PM, d b <va230...@gmail.com> wrote:
>
>> Hi RSmith,
>>
>> Thanks. Still, I could not delete with single query.
>>
>>
>> create table if not exists emp(key integer not null, name text not null ,
>> personaldata text not null, unique(key, name));
>> insert into emp (key, name, personaldata) values(1, 'a', 'z');
>> insert into emp (key, name, personaldata) values(1, 'b', 'zz');
>> insert into emp (key, name, personaldata) values(2, 'c', 'y');
>> insert into emp (key, name, personaldata) values(3, 'd', 'yy');
>> insert into emp (key, name, personaldata) values(1, 'e', 'yyy');
>>
>> bool delete_emp(int key, string name = "")
>> {
>> string query = ???;
>>
>> if(name.length() > 0)
>> {
>> //needs to delete specific row. by unique key.
>> }
>> else
>> {
>> //needs to delete rows belongs to key
>> }
>> }
>>
>>
>> On Mon, Nov 18, 2013 at 2:13 PM, d b <va230...@gmail.com> wrote:
>>
>>> Hi Luis,
>>>
>>> Those are parameters.
>>>
>>> This is the query after replacing with ?1 and ?2.
>>>
>>> delete from emp where key = '123' and (case when name = 'abc' is null
>>> THEN 1 else name = 'abc' end);
>>>
>>> It covered "delete from emp where key = '123' and name = 'abc';" but
>>> not other query.
>>>
>>> I tried with "select (case when name = 'abc' is null THEN 1 else name =
>>> 'abc' end) from emp;" query. It's always going to else portion when 'abc'
>>> doesn't exist in table. Any suggestions?
>>>
>>
>>
>
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