g414-haildb's People
g414-haildb's Issues
Inappropriate method used to read string-type field values
com.g414.haildb.TupleStorage.loadString
used getString()
to convert JNA pointer to Java string like this:
return HailDB.ib_col_get_value(tupl.tupl, index).getString(0);
The method getString()
assumed that every string buffer read from InnoDB is null-ended, which holds for string values written by com.g414.haildb.TupleStorage.storeString
but not for real InnoDB databases. So when I use the package to parse a InnoDB backup data file, there are always unexpected trailing characters beyond the real data.
I wonder if TupleStorage.loadString
could use getByteArray()
instead of getString()
to read exactly the same size of string data as field length specified, like the following code snippets doing:
try {
String res = new String(HailDB.ib_col_get_value(tupl.tupl, index).getByteArray(0, len), "utf-8");
return res;
} catch (UnsupportedEncodingException e) {
return "";
}
Of course TupleStorage.storeString
also need to be changed to stop writing a extra null if this modification is made. By doing this, this project could be used to correctly parse offline MySQL InnoDB backups instead of just as a private storage engine.
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