>> 2010/3/6 Chimerian <chimer...@o2.pl>:
>> values.push_back((char*)sqlite3_column_text(statement,
col));
>> // HERE IS ERROR !
>From: Simon Davies
>What error?
>I can not see why THIS line should provoke any error;
This line will
produce a runtime error when sqlite3_column_text(statement, col); returns NULL
pointer (and NULL value is a valid value for any affinity if not restricted by
NO NULL clause)
> but be aware that you are
creating a vector of INVALID pointers.
No. values.push_back
is not creating vector of invalid pointers.
It is creating vector of strings. The
problem is no valid string can be created from NULL pointer. This function will
fail trying to obtain the length of the string from NULL pointer.
>The return
from sqlite3_column_text is not valid after subsequent calls to any of
>sqlite3_step/sqlite3_reset/sqlite3_finalize.
VERY TRUE! It is
easy to forget about it!
>You need to make a copy of the string and store that, not the pointer
>returned from sqlite3_column_text.
True. But this
is done automatically by values.push_back()
The vector, like
all other Standard Library containers, stores copies - these copies are made
with the copy constructor.
Regards,
Samuel
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