public synchronized PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency) throws SQLException { return prepareStatement(sql, resultSetType, resultSetConcurrency, this.resultSetHoldability);
public synchronized PreparedStatement prepareStatement(String sql) throws SQLException { return prepareStatement(sql, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
    public synchronized PreparedStatement prepareStatement(String sql,             int resultSetType, int resultSetConcurrency) throws SQLException {        return prepareStatement(sql, resultSetType, resultSetConcurrency, this.resultSetHoldability);    }