”;
This chapter provides an example on how to sort records from a table using JDBC application. 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 application −
-
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 TestApplication.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; public class TestApplication { 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"; public 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 TestApplication.java C:>
When you run TestApplication, it produces the following result −
C:>java TestApplication 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: Ali Fetching records in descending order... ID: 100, Age: 30, First: Zara, Last: Ali ID: 102, Age: 30, First: Zaid, Last: Khan ID: 103, Age: 28, First: Sumit, Last: Mittal C:>
”;