Обсуждение: JDBC & custom type of variable types (!)
Hello,
I'd like to retrieve a custom type from a result set,
but problem: I don't know exactly the structure.
It may be float/text or int/text, so I'd need to map it to one of those java custom types:
deciType <Double,String>;
intType <Long, String>;
Can I rely on a ClassCastException as below to find the correct matching?
even when the custom type has NULL(s) in it ?
Or is there a better approach ?
case Types.STRUCT:
try
{
foo = (intType)resultset1.getObject(1);
}
catch (ClassCastException e)
{
blah = (deciType)resultset1.getObject(1);
}
(Postgres 9.3 , JDBC4 Postgresql Driver, Version 9.3-1100)
many thanks,
Marc Mamin
I expect that if it has a null you will have a problem, however I'm sure there is a quick way to test this. Just populate some data with NULL
On Wed, Nov 27, 2013 at 4:04 AM, Marc Mamin <M.Mamin@intershop.de> wrote:
Hello,I'd like to retrieve a custom type from a result set,but problem: I don't know exactly the structure.It may be float/text or int/text, so I'd need to map it to one of those java custom types:deciType <Double,String>;intType <Long, String>;Can I rely on a ClassCastException as below to find the correct matching?even when the custom type has NULL(s) in it ?Or is there a better approach ?case Types.STRUCT:try{foo = (intType)resultset1.getObject(1);}catch (ClassCastException e){blah = (deciType)resultset1.getObject(1);}(Postgres 9.3 , JDBC4 Postgresql Driver, Version 9.3-1100)many thanks,Marc Mamin
Marc Mamin-2 wrote > Can I rely on a ClassCastException as below to find the correct matching? > even when the custom type has NULL(s) in it ? Even if you could you should not. Generating exceptions is expensive. Try "instanceof" testing instead. I don't know enough bounce custom types in JDBC but as the column has the type, not the value, the result of getObject should be known even if NULL is involved. David J. -- View this message in context: http://postgresql.1045698.n5.nabble.com/JDBC-custom-type-of-variable-types-tp5780512p5780590.html Sent from the PostgreSQL - jdbc mailing list archive at Nabble.com.