Java JDBC: Deleting a record using JDBC Statement Interface

In this article, we will use JDBC API to delete a record into newly created table in MySQL database from Java application (i.e.; using Statement Interface)

 

1. Pre-requisite:

  • Java JDK 1.8.0_77
  • MySQL database 5.5.16
  • Eclipse Luna IDE 4.4.0
  • mysql-connector-java-5.1.38.jar file

 

2. Database parameters:

Let us move on and code an example to connect MySQL database from Java application to delete a record using JDBC API. But before that, we will list down required things to connect database

  • database server IP or address (localhost)
  • sever port (3306)
  • database name (PLAYER_INFO)
  • username (root)
  • password (root@123)

Note: All bold are database values to connect MySQL database

 

3. Deleting a record using JDBC Statement Interface

  • As we are ready with required things to connect MySQL database from Java application
  • We can use one of the methods from Statement Interface to execute “delete record” SQL query
    1. execute(String sqlQuery);
    2. executeUpdate(String sqlQuery);
    3. executeQuery(String sqlQuery);
  • Let us code a simple example using Statement Interface

DeleteRecordUsingJDBCStatement.java

package in.bench.resources.mysql.db.example;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;

public class DeleteRecordUsingJDBCStatement {

	public static void main(String[] args) {

		// variables
		Connection connection = null;
		Statement statement = null;

		// Step 1: Loading or registering MySQL JDBC driver class
		try {
			Class.forName("com.mysql.jdbc.Driver");
		}
		catch(ClassNotFoundException cnfex) {
			System.out.println("Problem in loading MySQL JDBC driver");
			cnfex.printStackTrace();
		}

		// Step 2: Opening database connection
		try {

			// Step 2.A: Create and get connection using DriverManager
			connection = DriverManager.getConnection(
          "jdbc:mysql://localhost:3306/PLAYER_INFO", "root", "root@123"); 

			// Step 2.B: Creating JDBC Statement 
			statement = connection.createStatement();

			// create SQL query to insert new PLAYER info
			String sqlDeleteQuery = 
                              "DELETE FROM PLAYER WHERE PLAYER_ID = 7";

			// Step 2.C: Executing SQL & retrieve data into ResultSet
			int sqlQueryResult = statement.executeUpdate(sqlDeleteQuery);

			System.out.println(sqlQueryResult + 
                    " indicates PLAYER info deletion is successful");
		}
		catch(SQLException sqlex){
			sqlex.printStackTrace();
		}
		finally {

			// Step 3: Closing database connection
			try {
				if(null != connection) {

					// cleanup resources, once after processing
					statement.close();

					// and then finally close connection
					connection.close();
				}
			}
			catch (SQLException sqlex) {
				sqlex.printStackTrace();
			}
		}
	}
}

Output:

1 indicates PLAYER info deletion is successful

 

4. Download:

 

Read Also:

 

References:

 

Happy Coding !!
Happy Learning !!

Java JDBC: Dropping a table using JDBC Statement Interface
Java JDBC: Updating a record using JDBC Statement Interface