JDBC - Select Database Example


This part gives a precedent on the most proficient method to choose a Database utilizing JDBC application. Prior to executing the accompanying precedent, ensure you have the accompanying set up −

  • To execute the accompanying precedent you have to supplant the username and password with your genuine client name and password.

  • Your MySQL or whatever database you are utilizing, is up and running.

Required Steps

The following advances are required to make another Database utilizing JDBC application −

  • Import the packages: Requires that you incorporate the bundles containing the JDBC classes required for the database programming. Regularly, utilizing import java.sql.* will suffice.

  • Register the JDBC driver: Requires that you introduce a driver so you can open an interchanges channel with the database.

  • Open a connection: Requires utilizing the DriverManager.getConnection() strategy to make a Connection object, which speaks to a physical association with a selected database.

    Selection of database is made while you plan database URL. Following model would make association with STUDENTS database.

  • Clean up the environment: Requires unequivocally shutting all the database assets as opposed to depending on the JVM's rubbish collection.

Sample Code

Copy and past the accompanying model in JDBCExample.java, gather and keep running as pursues −

//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/STUDENTS"; 

//Database credentials 

static final String USER = "username"; 

static final String PASS = "password"; 

public static void main(String[] args) { 

Connection conn = null; 

try{ 

//STEP 2: Register JDBC driver 

Class.forName("com.mysql.jdbc.Driver"); 

//STEP 3: Open a connection
System.out.println("Connecting to a chose database..."); 

conn = DriverManager.getConnection(DB_URL, USER, PASS); 

System.out.println("Connected database successfully..."); 

}catch(SQLException se){ 

//Handle mistakes for JDBC 

se.printStackTrace(); 

}catch(Exception e){ 

//Handle mistakes for Class.forName 

e.printStackTrace(); 

}finally{ 

//at long last square used to close resources 

try{ 

if(conn!=null) 

conn.close(); 

}catch(SQLException se){ 

se.printStackTrace(); 

}//end at long last try 

}//end try 

System.out.println("Goodbye!"); 

}//end main 

}//end JDBCExample

Now, let us arrange the above precedent as pursues −

C:\>javac JDBCExample.java 

C:\>

When you run JDBCExample, it creates the accompanying outcome −

C:\>java JDBCExample 

Connecting to a chose database... 

Connected database successfully... 

Goodbye! 

C:\>






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