www.openlinksw.com
docs.openlinksw.com

Book Home

Contents
Preface

Virtuoso Functions Guide

Administration
Aggregate Functions
Array Manipulation
BPEL APIs
Backup
Compression
Cursor
Date & Time Manipulation
Debug
Dictionary Manipulation
Encoding & Decoding
File Manipulation
Free Text
Hashing / Cryptographic
LDAP
Locale
Mail
Miscellaneous
Number
Phrases
RDF data
Remote SQL Data Source
Replication
SOAP
SQL
__any_grants
close
collation_define
complete_table_name
delay
end_result
exec
exec_metadata
exec_next
exec_result
exec_result_names
exec_score
identity_value
name_part
registry_get
registry_get_all
registry_name_is_pro...
registry_remove
registry_set
result
result_names
row_count
sequence_get_all
sequence_next
sequence_remove
sequence_set
set_identity_column
set_row_count
set_user_id
signal
sinv_create_inverse
sinv_create_key_mapp...
sinv_drop_inverse
sys_stat_analyze
sys_stat_histogram
table_drop_policy
table_set_policy
username
String
Transaction
Type Mapping
UDDI
User Defined Types & The CLR
VAD
Virtuoso Java PL API
Virtuoso Server Extension Interface (VSEI)
Web & Internet
XML
XPATH & XQUERY

Functions Index

signal

Signal an exception in the calling procedure
signal (in sqlstate varchar, in message varchar);
Description

This signals the given SQLSTATE with the message. The calling procedure will transfer control to the most appropriate local handler. In the absence of a local handler the procedure terminates and signals the exception in the scope where it was called from, until there either is a handler or there are no more calling procedures. If there is no handler in the entire stack of call contexts the error is signalled to the client. Handlers can be declared with whenever .. goto and the declare handler for construct. See the Virtuoso/PL documentation.

CREATE PROCEDURE WITHDRAW (IN C_ID VARCHAR, IN DELTA NUMERIC)
{
    DECLARE BAL NUMERIC;

    DECLARE CR CURSOR FOR SELECT C_BALANCE FROM CUSTOMER WHERE C_ID = C_ID;

    WHENEVER NOT FOUND GOTO NOCUSTOMER;

    OPEN CR (EXCLUSIVE);
    FETCH CR INTO BAL;
    IF (BAL > DELTA)
	UPDATE CUSTOMER SET C_BALANCE = BAL - DELTA WHERE CURRENT OF CR;
    ELSE
	SIGNAL ('NOMONEY', 'INSUFFICIENT BALANCE.');

    RETURN;

NOCUSTOMER:
    SIGNAL ('NOCUS', 'BAD CUSTOMER ID');
}