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JDBC - Delete Records Example

This section gives a precedent on the most proficient method to erase records from a table utilizing JDBC application. Prior to executing following model, ensure you have the accompanying set up −

  • To execute the accompanying model 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.

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 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 database server.

  • Execute a query: Requires utilizing an object of sort Statement for building and presenting a SQL articulation to erase records from a table. This Query makes utilization of the WHERE statement to erase contingent records.

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

Sample Code

Copy and glue the accompanying precedent in, incorporate 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; 


//STEP 2: Register 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("Creating statement..."); 

stmt = conn.createStatement(); 

String sql = "DELETE FROM Registration " + 

"WHERE id = 101"; 


//Now you can separate all the records 

//to see the remaining records 

sql = "SELECT id, first, last, age FROM Registration"; 

ResultSet rs = stmt.executeQuery(sql); 


//Retrieve by segment name 

int id = rs.getInt("id"); 

int age = rs.getInt("age"); 

String first = rs.getString("first"); 

String last = rs.getString("last");
    //Display values 

System.out.print("ID: " + id); 

System.out.print(", Age: " + age); 

System.out.print(", First: " + first); 

System.out.println(", Last: " + last); 



}catch(SQLException se){ 

//Handle blunders for JDBC 


}catch(Exception e){ 

//Handle blunders for Class.forName 



//at last square used to close resources 




}catch(SQLException se){ 

}//do nothing 




}catch(SQLException se){ 


}//end at long last try 

}//end try 


}//end main 

}//end JDBCExample

Now, let us accumulate the above precedent as pursues −



When you run JDBCExample, it delivers the accompanying outcome −

C:\>java JDBCExample 

Connecting to a chose database...
Connected database successfully...
Creating statement...
ID: 100, Age: 30, First: Zara, Last: Ali
ID: 102, Age: 30, First: Zaid, Last: Khan
ID: 103, Age: 28, First: Sumit, Last: Mittal

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