How to make connection of database in java?

Question

i have to update a table from my application on the click on a button, can you tell me how can i make connection and can execute query from my application to database?

Answer 1

you can use JDBC driver like this , follow these steps ->

//STEP 1. Import required packages
import java.sql.*;

public class JDBCExample {
   // JDBC driver name and database URL
   static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";  
   static final String DB_URL = "jdbc:mysql://localhost/";

   //  Database credentials
   static final String USER = "username";
   static final String PASS = "password";
   
   public static void main(String[] args) {
   Connection conn = null;
   Statement stmt = null;
   try{
      //STEP 2: Register JDBC driver
      Class.forName("com.mysql.jdbc.Driver");

      //STEP 3: Open a connection
      System.out.println("Connecting to database...");
      conn = DriverManager.getConnection(DB_URL, USER, PASS);

      //STEP 4: Execute a query
      System.out.println("Creating database...");
      stmt = conn.createStatement();
      
      String sql = "CREATE DATABASE STUDENTS";
      stmt.executeUpdate(sql);
      System.out.println("Database created successfully...");
   }catch(SQLException se){
      //Handle errors for JDBC
      se.printStackTrace();
   }catch(Exception e){
      //Handle errors for Class.forName
      e.printStackTrace();
   }finally{
      //finally block used to close resources
      try{
         if(stmt!=null)
            stmt.close();
      }catch(SQLException se2){
      }// nothing we can do
      try{
         if(conn!=null)
            conn.close();
      }catch(SQLException se){
         se.printStackTrace();
      }//end finally try
   }//end try
   System.out.println("Goodbye!");
}//end main
}//end JDBCExample

I think you got the point.

Comments

yah i got the point thanks :)

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their should Initialization of  Statement stmt = null; Connection conn = null;

Answer 2

you can make connection by jdbc like this 

Statement stmt = null;

Connection conn = null;

Class.forName("net.sourceforge.jtds.jdbc.Driver");

conn = DriverManager.getConnection

("jdbc:jtds:sqlserver://server_name:1433/DBNAME","Username","Password");

Statement stmt1 =conn.createStatement();

 

And after this you can add your query and you can use your result according to your need.