How to Sort Contents of a Table in JDBC?
Last Updated :
08 Dec, 2020
Sorting the contents of a table means rearranging the records in an organized way to make data more usable. You can sort all the records of a table by choosing a column within a table according to which data has to be sorted. In simple words, when you sort data, you arrange the data in a logical order.
- Text and Numbers both can be sorted in any order ie ascending or descending.
- One or more columns can be sorted simultaneously.
- In SQL, the ORDER BY clause is used to sort the contents of a table in JDBC.
- By default, some databases sort the query in ascending order. But we can sort in descending order also.
- We can use the ORDER BY clause with one or more columns simultaneously.
Steps to follow:
- Import the necessary libraries
- Register the Driver Class
- Connect to your database by providing address, username, and password
- Create your statement
- Write your query
- Execute your query and store the result in a resultset
- Display the result
How ORDER BY works:
query -----> select * from Table_Name ORDER BY Column1,Column 2;
user table -----> --------------------------------------------------
|| id || Name || Age ||
|| 1 || Prateek || 20 ||
|| 4 || Chhavi || 21 ||
|| 3 || Aman || 22 ||
|| 2 || Kartikay || 22 ||
|| 5 || Prakhar || 20 ||
--------------------------------------------------
Example 1: select * from user ORDER BY id;
Output: --------------------------------------------------
|| id || Name || Age ||
|| 1 || Prateek || 20 ||
|| 2 || Kartikay || 22 ||
|| 3 || Aman || 22 ||
|| 4 || Chhavi || 21 ||
|| 5 || Prakhar || 20 ||
--------------------------------------------------
Example 2: select * from user ORDER BY name,age;
Output: --------------------------------------------------
|| id || Name || Age ||
|| 3 || Aman || 22 ||
|| 4 || Chhavi || 21 ||
|| 2 || Kartikay || 22 ||
|| 5 || Prakhar || 20 ||
|| 1 || Prateek || 20 ||
--------------------------------------------------
Example 1:
Java
import java.sql.*;
public class GFG {
public static void main(String[] args) throws Exception
{
Class.forName("org.apache.derby.jdbc.ClientDriver");
Connection con = DriverManager.getConnection();
Statement stmt = con.createStatement();
String query = "Select * from users ORDER by id";
ResultSet rs = stmt.executeQuery(query);
System.out.println("Id Name Age");
while (rs.next()) {
int id = rs.getInt("id");
String name = rs.getString("name");
int age = rs.getInt("age");
System.out.println(id + " " + name + " "
+ age);
}
con.close();
}
}
|
Output
Example 2:
Java
import java.sql.*;
public class GFG {
public static void main(String[] args) throws Exception
{
Class.forName("org.apache.derby.jdbc.ClientDriver");
Connection con = DriverManager.getConnection();
Statement stmt = con.createStatement();
String query
= "Select * from users ORDER by name,age";
ResultSet rs = stmt.executeQuery(query);
System.out.println("Id Name Age");
while (rs.next()) {
int id = rs.getInt("id");
String name = rs.getString("name");
int age = rs.getInt("age");
System.out.println(id + " " + name + " "
+ age);
}
con.close
}
}
|
Output
Note: We can’t use Prepared Statement to sort the contents of the table. Prepared statement issues an SQL statement together with bound variables so it cannot be used for columns or table names.
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