Arrange a Column of Database Table
This section provides an example with code that arrange
the records of database table in descending order. The descending order provides
a way for arranging records from largest to smallest in a sequence like:
100,85,45,12,......... See detail information below:
Description of program:
First of all in this program we are will establish the connection
with MySQL database. As soon as the connection gets established it takes a table name and column name
which we want to see in descending order. If the data gets arranged in descending order then it
we are going to display the message "Descending order
of given column:"........... otherwise shows a message "SQL
statement is not executed!".
Description of code:
SELECT col_name
FROM table_name
ORDER BY
col_name DESC:
This query helps us to arrange the records of
database table in descending order.
The SELECT
specifies the table columns that are retrieved.
The FROM
clause tells from where the tables has been accessed.
The ORDER BY
clause needed to us whenever, we want to sort the data of any column of the
table.
The DESC clause
provides the facility to arrange the data in descending order (decrease order).
Here is the code of program:
import java.io.*;
import java.sql.*;
public class ColumnDescOrder{
public static void main(String[] args) {
System.out.println("Descending order example!");
Connection con = null;
try{
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection
("jdbc:mysql://localhost:3306/jdbctutorial","root","root");
try{
Statement st = con.createStatement();
BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter table name:");
String table = bf.readLine();
System.out.println("Enter column name which have to see descending order:");
String col_name = bf.readLine();
ResultSet res = st.executeQuery
("SELECT "+col_name+" FROM "+table+" ORDER BY "+col_name+" DESC");
System.out.println("Descending order of given column:");
while (res.next()){
int col = res.getInt(1);
System.out.println(col);
}
}
catch (SQLException s){
System.out.println("SQL statement is not executed!");
}
}
catch (Exception e){
e.printStackTrace();
}
}
}
|
Download this example.
Output of program:
C:\vinod\jdbc\jdbc\jdbc-mysql>javac ColumnDescOrder.java
C:\vinod\jdbc\jdbc\jdbc-mysql>java ColumnDescOrder
Descending order example!
Enter table name:
emp_sal
Enter column name which have to see descending order:
Emp_sal
Descending order of given column:
10000
8000
5000
4500
600 |
|
Del.icio.us
Digg
Google
Spurl
Blink
Furl
Simpy
Y! MyWeb
Current Comments
0 comments so far (post your own) View All Comments Latest 10 Comments: