Display records from database using JDBC

In this blog we will know how to display records from database using JDBC (Java Database Connectivity) in console window.

Introduction 

 

In this blog we will know how to display records from database using JDBC (Java Database Connectivity) in the console window.

Here we use Type-1 driver (JDBC-ODBC bridge)

 

Creation of dsn(database source name) for Oracle

 

Start-Control panel- Administrative Tools- Data Sources (ODBC)-go to system DSN tab-click add button-select a driver for which you want to set up a data source (for Oracle- Oracle in XE)-select it and click finish-give any name in the data source name textbox-then click ok button.

Note: - Here Username=system, Password=pintu and DSN name=dsn1

 

Table Creation

 

Create table employee (empno int,empname varchar(50),sal int)

 

Example:- To select a record from a table 

/*To select record from a table by using Statement*/
import java.sql.*;
public class select
{
 public static void main(String args[]) throws Exception {
  //Step-1
  //load the class for driver
  Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
  //Step -2
  Connection con = DriverManager.getConnection("jdbc:odbc:dsn1", "system", "pintu");
  //Step -3
  System.out.println("Connected to database");
  Statement stmt = con.createStatement();
  //Step-4
  ResultSet rs = stmt.executeQuery("select * from employee");
  //Fetching data from ResultSet and display
  while (rs.next())
  {
   //to fetch value from a column having number type of value
   int x = rs.getInt("empno");
   //to fetch value from a column having varchar/text type of value
   String y = rs.getString("empname");
   //to fetch value from a column having number type of value
   int z = rs.getInt("sal");
   System.out.println(x + "   " + y + " " + z);
  }
  //Step-5
  con.close();
 }
}

Compile

 

Javac select.java

Java select