Where clause

Where clause

I have doubt in Where clause .. i got a Employid from user and check the id and display the details of that id what can i do?

View Answers

June 15, 2012 at 12:42 PM

The WHERE clause is used to filter records.It is used to extract only those records that fulfill a specified criterion.

SQL WHERE Syntax:

SELECT column_name(s)
FROM table_name
WHERE column_name = value;

Example:

In the given example, we have accepted the id from the user and retrieve the record of that user from the database.

import java.sql.*;
import java.util.*;

class RetrieveData 
{
    public static void main(String[] args) throws Exception
    {
        Scanner input=new Scanner(System.in);
        System.out.print("Enter id: ");
        int id=input.nextInt();
        Class.forName("com.mysql.jdbc.Driver").newInstance();
        Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root" );
        Statement st=conn.createStatement();
        ResultSet rs=st.executeQuery("select * from data where id="+id+"");

        while(rs.next()){
            String name=rs.getString("name");
            String address=rs.getString("address");
            String contact=rs.getString("contactNo");
            String email=rs.getString("email");

            System.out.println(name+" \t "+address+" \t "+contact+" \t "+email);

        }
    }
}

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