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Sends an exception code with message to the client.
void Ns_PdSendException(char *code, char *msg);
Whenever an exception is raised during the communction with the database, the proxy daemon sends the code with message to the client indicating the source of the problem.
if ((state->exceptionCode[0] == '2') && (state->exceptionCode[1]
== '3')) {
char *exceptionMsg = "Integrity constraint violation";
Ns_PdSendException(state->exceptionCode, exceptionMsg);
}