Hello,
Probably this mail should go to the internals list :)
I was looking into MySQL Client libaray and I could
figure out the DATA are kept as linked list of
MYSQL_ROW structure i.e. in MYSQL_ROWS being one node.
Now MYSQL_ROW is typedefed as char** that is array of
strings.
Looking into the mysql_fetch_lengths() API code, the
lengths are calculated from the offset between
pointers. Forgive my C knowledge, but I was unable to
understand how we are calculating thru offset. As far
as I can understand this is what is happening:
A MYSQL_ROW is allocated with field_count number of
indexes. Each index is then again my_alloced() to
store information about each each and so on. i.e.
myrow = malloc ( sizeof (char*), field_count );
myrow[0] = malloc ( sizeof(char), field_data );
myrow[1] = malloc ( sizeof(char), field_data );
myrow[2] = malloc ( sizeof(char), field_data );
....
In this case how can we calculate lengths using
offsets? Or I am missing something very stupid. A
little clarity will do hell lot of good to me :)
Any pointers...
Regards
Karam
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