Arrange a Column of Database Table
This section will provide you the facility for arranging
the data of database table in ascending order. Firstly we should know what is
the meaning of ascending order. The
ascending order means an arrangement of data from smallest to largest number in
sequence like: 3,6,8,19,21,......... Here we are going to give an example to arrange the
data of a column in ascending order with the help of some java method and APIs.
See detailed information below:
Description of program:
Firstly we are going to establish the connection with
the MySQL
database. After the connection has been established we need to give a table name and column name which have to
be in ascending order. If data gets arranged in ascending order then shows "Ascending
order of given column:" with it's arranged data and if any problem
arises to in this process then shows a message "SQL statement is not
executed!".
Description of code:
SELECT col_name FROM
table_name ORDER BY
col_name ASC :
This query shows data of a column in ascending
order of the specific database table.
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 ASC
clause is used to arrange data in ascending order.
It takes column name and table name as its
input.
col_name: This is a column
name of a table which have to see in the ascending order.
table_name: This is a table
name.
Here is the code of program:
import java.io.*;
import java.sql.*;
public class ColumnAscOrder{
public static void main(String[] args) {
System.out.println("Ascending 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 ascending order:");
String col_name = bf.readLine();
ResultSet res = st.executeQuery
("SELECT "+col_name+" FROM "+table+" ORDER BY "+col_name+" ASC");
System.out.println("Ascending 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();
}
}
}
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Download this example.
Output of program:
C:\vinod\jdbc\jdbc\jdbc-mysql>javac ColumnAscOrder.java
C:\vinod\jdbc\jdbc\jdbc-mysql>java ColumnAscOrder
Ascending order example!
Enter table name:
emp_sal
Enter column name which have to see ascending order:
Emp_sal
Ascending order of given column:
600
4500
5000
8000
10000 |
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