Hi,
does it segfault in operator[] or when accessing the value? operator[]
returns a tntdb::Value, which may be null and you can ask, if it null.
And you should before accessing the value. You must not fetch a value
from a tntdb::Value, which is actually null. If you do, the reaction is
the same as accessing a std::vector outside its bounds. And that is
undefined. Most probably a segfault.
For every value you fetch from a database, which may be null you should
always first ask, if it is null.
I use one of the variants of method tntdb::Value::get to fetch the
value, which does the right job quite easily. This should work:
tntdb::Row r = stmt.selectRow();
unsigned value1;
std::string value2;
double value3;
r[0].get(value1);
r[1].get(value2);
r[2].get(value3);
The get methods return a bool, whether the value is null. If it is, the
original value is not changed nor the tntdb::Value is accessed. So if
you do need to do something special there, you can do something like:
if (!r[1].get(value2))
std::cout << "oh - value2 was null somehow" << std::endl;
If it still segfault, you have hit a bug, and you shoul tell us.
Tommi
On 11/27/2011 07:49 PM, Carlos Franke wrote:
Hi!
I am getting a segfault with tntdb, using the following ingredients:
1. An tntdb::Row with an empty cell. (Created by selecting from a
suitable table with a tntdb::Statement and selectRow())
2. Accesing that cell with operator[].
It is easy to work around this by checking isNull() before using
operator[], but I am pretty sure this is not supposed to segfault.
Carlos
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All the data continuously generated in your IT infrastructure
contains a definitive record of customers, application performance,
security threats, fraudulent activity, and more. Splunk takes this
data and makes sense of it. IT sense. And common sense.
http://p.sf.net/sfu/splunk-novd2d
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