text truncated using perl DBI insert

The problem is that DBI's insert leaves long string truncated when inserting to MS SQL server. Here are my codes:

my $insert = $dbh->prepare("INSERT INTO my_table (field_1, field_2) values (?, ?)");
$insert->execute($value_1, $value_2);

where field_2 has data type of varchar(100) and $value_2 is a text string of 90 characters with spaces but no other special characters.

After the statement is executed, with no error raised, I checked the database and apparently the actual inserted $value_2 is truncated at the 80th character, which is in the middle of a regular English word (i.e. not a special character).

I've tried to alter the data type of field_2 to varchar(150) and text. I've also used $dbh->quote($value_2) in place of $value_2. But they didn't hel开发者_C百科p.

Why is this happening? What should I do? Thx!!

If you are using freeTDS it is probably a bug identified in the freeTDS mailing list. See freetds silently truncating text/varchar/etc fields to 80 characters and http://lists.ibiblio.org/pipermail/freetds/2011q2/026943.html and http://lists.ibiblio.org/pipermail/freetds/2011q2/026925.html and http://lists.ibiblio.org/pipermail/freetds/2011q2/026944.html

I'd say try various strings to see if they all behave the same way. It's probably an encoding issue as davorg suggests. The default collation in MySQL is Swedish or Latin1 as I recall, so in MySQL you'll probably want to change your collation to utf8_general_ci.