JDBC - Drop Tables Example


This part gives a model on the best way to erase a table utilizing JDBC application. Prior to executing the accompanying precedent, ensure you have the accompanying set up −

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

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

NOTE: This is a genuine activity and you need to settle on a firm choice before continuing to erase a table, in light of the fact that all that you have in your table would be lost.

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 database programming. Regularly, utilizing import java.sql.* will suffice.

  • Register the JDBC driver: Requires that you instate a driver in this way, you can open a correspondences channel with the database.

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

  • Execute a query: Requires utilizing an object of sort Statement for building and presenting a SQL explanation to drop a table in a seleted database.

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

Sample Code

Copy and glue the accompanying precedent in JDBCExample.java, accumulate 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; 

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 a chose database..."); 

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

System.out.println("Connected database successfully...");
    
    //STEP 4: Execute a query 

System.out.println("Deleting table in given database..."); 

stmt = conn.createStatement(); 

String sql = "DROP TABLE REGISTRATION "; 

stmt.executeUpdate(sql); 

System.out.println("Table erased in given database..."); 

}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(stmt!=null) 

conn.close(); 

}catch(SQLException se){ 

}//do nothing 

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 order the above model 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... 

Deleting table in given database... 

Table erased in given database... 

Goodbye! 

C:\>






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