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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