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This modification provides the capability to return an error message from a stored procedure or user-defined function (UDF).
Before this modification, the only way for a stored procedure to set the return code to a value different than 0 was to throw a DhSQLException() either directly (only when using the NetBeans plugin to generate the stored procedure) by:
throw new DhSQLException(678,"my error message");
or through the DhSQLThrow class:
DhSQLThrow.throwSQLException(678,"my error message");
In both cases the error code returned was interpreted as a known SQL error code and the error message was set to the one for the specific error code returned, ignoring the message.
This modification adds a preferred way of returning an error message by calling the new fail(String message) method. This method causes the stored procedure to terminate with error -26015 and sets the error message to the string passed in. The message will be truncated if it is larger than 510 characters. For example:
ISQL> CREATE PROCEDURE excp()
BEGIN
fail("my error message");
END
ISQL> call excp();
ISQL> error(-26015): my error message
