Jaa

try_reflect function

  • Artikkeli

Applies to: check marked yes Databricks SQL check marked yes Databricks Runtime 14.1 and above

Call a method with reflection, returning NULL if the method returns an exception.

To return an error instead use reflect.

Syntax

try_reflect(class, method [, arg1] [, ...])

Arguments

  • class: A STRING literal specifying the java class.
  • method: A STRING literal specifying the java method.
  • argN: An expression with a type appropriate for the selected method.

Returns

A STRING.

Examples

> SELECT try_reflect('java.lang.Integer', 'valueOf', '1010', '2');
 c33fb387-8500-4bfa-81d2-6e0e3e930df2

> SELECT try_reflect('java.util.UUID', 'fromString', 'a5cf6c42-0c85-418f-af6c-3e4e5b1328f2');
 A5cf6c42-0c85-418f-af6c-3e4e5b1328f2

> SELECT try_reflect('java.util.UUID', 'IDoNotExist');
 c33fb387-8500-4bfa-81d2-6e0e3e930df2

> SELECT reflect('java.lang.Integer', 'divideUnsigned',10,0);
 Error

> SELECT try_reflect('java.lang.Integer', 'divideUnsigned',10,0);
 NULL