在准备好的语句中使用ORDER BY

Question

I'm creating a web app that displays a table using data from a database using Java MVC.

I have a prepared statement that I'm using to generate the table that works fine until i try and use ORDER BY.

I'm quite confused as when I run this query in the mySQL workbench it works fine:

SELECT * FROM appointments ORDER BY date

However when i put it into my prepared statement in the browser it returns an unordered list.

public void doRead(){
    String query = "SELECT * FROM appointments ORDER BY date";

    try {
        PreparedStatement ps = this.connection.prepareStatement(query);
        this.results = ps.executeQuery();
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

Would appreciate any help.

as requested im printing the table with this method here:

try {
        while(this.results.next()){
            Appointment appointment = new Appointment();
            appointment.setAppointmentID(this.results.getInt("appointment_id"));
            appointment.setDescription(this.results.getString("description"));
            appointment.setDate(this.results.getString("date"));

            table += "<tr>";
            table += "<td>";
            table += appointment.getDescription();
            table += "</td>"; 
            table += "<td>";
            table += appointment.getDate();
            table += "</td>";
            table += "</tr>";
        }
    } catch (SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    table += "</table>";
    return table;
}

the output in browser:

Dentist 2015-09-17

Dentist 2015-09-17

Dentist 2015-09-17

Dentist 2015-10-09

Dentist 2015-09-03

Dentist 2015-09-03

Dentist 2015-09-03

Answer 1

DATE is a reserved word . Use backticks:

String query = "SELECT * FROM appointments ORDER BY `date`";

Also better make results a local variable and close it.

Tip:

Use a StringBuilder instead of String for table . Much faster, less memory hungry. Better even would be to pass a PrintWriter for outputting.

Answer 2

尝试添加排序顺序“ ASC”：

SELECT * FROM appointments ORDER BY date ASC