Java + MySQL-PreparedStatement编码问题

Question

I got this program that interacts with MySQL. It works but acts strangely when non-ASCII occur in the statement. I'm using prepared statement:

public ResultSet executeQuery(Connection _conn, int _val1, String _val2) throws SQLException {
    PreparedStatement stmt = _conn.prepareStatement("SELECT c.name  FROM categories c,languages l WHERE c.language = l.id AND c.user = ? AND l.name = ?;");
    stmt.setInt(1, _val1);
    stmt.setString(2, _val2);
    return stmt.executeQuery();
}

It works fine unless I use something like "čččč" in _val2. Problem is somewhere in Java because when I prepare the statement a print it to stdout those characters are just "????". Any suggestions?

Answer 1

Try adding characterEncoding=UTF-8 parameter to the end of your JDBC connection URL. Even set the table and column character set to UTF-8. This article explains how to do that.