Java & MySQL - Sorting Data Example

This chapter provides an example on how to sort records from a table using JDBC apppcation. This would use asc and desc keywords to sort records in ascending or descending order. Before executing the following example, make sure you have the following in place −

To execute the following example you can replace the username and password with your actual user name and password.

Your MySQL database you are using, is up and running.

Required Steps

The following steps are required to create a new Database using JDBC apppcation −

Import the packages − Requires that you include the packages containing the JDBC classes needed for database programming. Most often, using import java.sql.* will suffice.

Open a connection − Requires using the DriverManager.getConnection() method to create a Connection object, which represents a physical connection with a database server.

Execute a query − Requires using an object of type Statement for building and submitting an SQL statement to sort records from a table. These Queries make use of asc and desc clauses to sort data in ascending and descening orders.

Clean up the environment − try with resources automatically closes the resources.

Sample Code

Copy and paste the following example in TestApppcation.java, compile and run as follows −

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

pubpc class TestApppcation {
   static final String DB_URL = "jdbc:mysql://localhost/TUTORIALSPOINT";
   static final String USER = "guest";
   static final String PASS = "guest123";
   static final String QUERY = "SELECT id, first, last, age FROM Registration";

   pubpc static void main(String[] args) {
      // Open a connection
      try(Connection conn = DriverManager.getConnection(DB_URL, USER, PASS);
         Statement stmt = conn.createStatement();) {		      
         System.out.println("Fetching records in ascending order...");
         ResultSet rs = stmt.executeQuery(QUERY + " ORDER BY first ASC");
         while(rs.next()){
            //Display values
            System.out.print("ID: " + rs.getInt("id"));
            System.out.print(", Age: " + rs.getInt("age"));
            System.out.print(", First: " + rs.getString("first"));
            System.out.println(", Last: " + rs.getString("last"));
         }

         System.out.println("Fetching records in descending order...");
         rs = stmt.executeQuery(QUERY + " ORDER BY first DESC");
         while(rs.next()){
            //Display values
            System.out.print("ID: " + rs.getInt("id"));
            System.out.print(", Age: " + rs.getInt("age"));
            System.out.print(", First: " + rs.getString("first"));
            System.out.println(", Last: " + rs.getString("last"));
         }
         rs.close();
      } catch (SQLException e) {
         e.printStackTrace();
      } 
   }
}

Now let us compile the above example as follows −

C:>javac TestApppcation.java
C:>

When you run TestApppcation, it produces the following result −

C:>java TestApppcation
Fetching records in ascending order...
ID: 103, Age: 28, First: Sumit, Last: Mittal
ID: 102, Age: 30, First: Zaid, Last: Khan
ID: 100, Age: 30, First: Zara, Last: Ap
Fetching records in descending order...
ID: 100, Age: 30, First: Zara, Last: Ap
ID: 102, Age: 30, First: Zaid, Last: Khan
ID: 103, Age: 28, First: Sumit, Last: Mittal
C:>