Re: Dynamic query execution using array
| От | ChoonSoo Park |
|---|---|
| Тема | Re: Dynamic query execution using array |
| Дата | |
| Msg-id | CACgbiFsjOcXNVNx1GuLAe2C0LY2AKd1ikt9+yiBdh7Q6sL1feQ@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: Dynamic query execution using array (Pavel Stehule <pavel.stehule@gmail.com>) |
| Ответы |
Re: Dynamic query execution using array
|
| Список | pgsql-general |
It works!
One more question.
Do I have to use CAST for parameter value holder?
employee table's dept_id and salary columns are integer types.
RETURN QUERY EXECUTE 'SELECT * FROM employee WHERE dept_id = $1[1] and salary <= $1[2]' using tmpArrayValues;
When I use text array, it complains:
ERROR: operator does not exist: integer = text
So I have to match the type using CAST.
RETURN QUERY EXECUTE 'SELECT * FROM employee WHERE dept_id = CAST($1[1] as integer) and salary <= CAST($1[2] as integer)' using tmpArrayValues;
Looks like
Other ways to avoid using CAST?
Best Regards,
Choon Park
On Fri, Jul 6, 2012 at 11:45 AM, Pavel Stehule <pavel.stehule@gmail.com> wrote:
Hello
2012/7/6 ChoonSoo Park <luispark@gmail.com>:it can work, but you have to use array access notation> Inside a function, I can execute dynamic query like this
>
> dept_id = 1;
> salary = 50000;
> RETURN QUERY EXECUTE 'SELECT * FROM employee WHERE dept_id = $1 and
> salary >= $2' using dept_id, salary;
>
> When the query condition is dynamically generated and number of parameters
> is also dynamic,
>
> DECLARE
> tmpArray text[];
> query text;
> BEGIN
> -- inputParameter will have the whole parameter list separated by
> comma.
> tmpArray = string_to_array(inputParam, ',');
>
> -- Let's assume the query condition is dynamically constructed from
> somewhere else.
> query = 'select * FROM employee WHERE ' || dynamicQueryFunction(...);
> RETURN QUERY EXECUTE query using tmpArray;
> END
>
> I know above one will fail to execute.
> Of course, if I construct dynamic query using one of (quote_nullable,
> quote_literal, format), I can execute it.
>
> Is there any other way to achieve dynamic query execution using array value?
EXECUTE 'SELECT .. WHERE a = $1[1] AND b = $1[2]' USING ARRAY[10,20]
Regards
Pavel
>
> Thanks in advance,
> Choon Park
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