Apache DBUtils close connection

Question

I am reading the update method of DBUtils. From my understanding, the connection of dataSource should be closed after the sql query is run. but I found several implements of the update method which pass false as closeConn parameter. Could anyone tell me why this?

    public int update(Connection conn, String sql, Object... params) throws SQLException {
        return update(conn, false, sql, params);
    }


    public int update(String sql) throws SQLException {
        Connection conn = this.prepareConnection();

        return this.update(conn, true, sql, (Object[]) null);
    }

    private int update(Connection conn, boolean closeConn, String sql, Object... params) throws SQLException {
        if (conn == null) {
            throw new SQLException("Null connection");
        }

        if (sql == null) {
            if (closeConn) {
                close(conn);
            }
            throw new SQLException("Null SQL statement");
        }

        PreparedStatement stmt = null;
        int rows = 0;

        try {
            stmt = this.prepareStatement(conn, sql);
            this.fillStatement(stmt, params);
            rows = stmt.executeUpdate();

        } catch (SQLException e) {
            this.rethrow(e, sql, params);

        } finally {
            close(stmt);
            if (closeConn) {
                close(conn);
            }
        }

        return rows;
    }