RE: dbms_system - set a string parameter in another session?
- From: "Dunbar, Norman" <norman.dunbar@xxxxxxxxxxxxxxxxxxxxxxxxx>
- To: "ORACLE-L" <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 1 Mar 2010 09:21:44 -0000
Morning all,
>> That string parameters can have "variable width." is
>> actually, in my
>> opinion, a strong enough reason for Oracle to not provide or
>> not even
>> attempt to provide a SET command for parameters in other sessions.
I disagree!
However in my defence, I claim ignorance of how Oracle does things
internally, but I'm almost 100% certain plain C is used, so, to change a
string parameter would be as [simple as] follows:
char *new_string = new [maximum_parameter_size] char;
if (new_string) {
strncpy(new_string, input_buffer, maximum_parameter_size);
char *temp_string = old_string;
get_a_latch();
old_string = new_string
free_latch();
delete [] temp_string;
} else {
report_error(...);
}
Apologies for syntax etc, but the above looks simple to me :
Allocate room for the new string, read it into the allocated area from
the input buffer, get the address of the buffer holding the old value,
grab a latch, replace the old buffer pointer with the new one, free the
latch, delete the storage allocated for the old value. Job done.
Cheers,
Norman.
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