Update record using Statement in Java

We saw how to Create a table and Insert Data using Statement in Java.

Now lets update the data into that is already present in the table using Statement.

Update record SQL

Below is the query that can be fired directly on database to update record.

UPDATE employee_details 
SET salary = 12000 
WHERE designation = 'Engineer';

UPDATE employee_details

SET salary = 12000

WHERE designation = 'Engineer';

Method from Statement Interface used

int executeUpdate(String sql)

1	int executeUpdate(String sql)

“Executes the given SQL statement, which may be an INSERT, UPDATE, or DELETE statement or an SQL statement that returns nothing, such as an SQL DDL statement.”

In case of Updating records, executeUpdate(String sql) returns the total number of records that where updated using the Update SQL statement.

Now lets see the sample code for firing this SQL using JDBC

Example : Update record using Statement in Java

package com.kscodes.sampleproject.jdbc;

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

public class StatementUpdateExample {

	public static String DRIVER_CLASS_NAME = "com.mysql.jdbc.Driver";
	public static String CONNECTION_URL = "jdbc:mysql://localhost:3306/mysql";
	public static String CONNECTION_USER = "kscodes";
	public static String CONNECTION_PASSWORD = "kscodes";

	public static void main(String[] args) {

		String updateSql = "UPDATE employee_details SET salary = 12000 "
				+ " WHERE designation = 'Engineer';";

		try (Connection connection = getConnection();
				Statement statement = connection.createStatement()) {

			int rowCount = statement.executeUpdate(updateSql);

			System.out.println("Record Updated successfully in database. Total reocrds Updated are :: "
							+ rowCount);

		} catch (SQLException e) {
			System.out.println("An exception occurred while updating records in table. Exception is :: "+ e);
		}
	}

	public static Connection getConnection() {

		try {
			Class.forName(DRIVER_CLASS_NAME);
		} catch (ClassNotFoundException e) {
			System.out.println("Error while registering JDBC driver");
			return null;
		}

		Connection connection = null;
		try {
			connection = DriverManager.getConnection(CONNECTION_URL,
					CONNECTION_USER, CONNECTION_PASSWORD);

		} catch (SQLException e) {
			System.out.println("Failed to create Connection");
			return null;
		}
		System.out.println("Connection created Successfully.");
		return connection;
	}
}

package com.kscodes.sampleproject.jdbc;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

import java.sql.Statement;

public class StatementUpdateExample {

public static String DRIVER_CLASS_NAME = "com.mysql.jdbc.Driver";

public static String CONNECTION_URL = "jdbc:mysql://localhost:3306/mysql";

public static String CONNECTION_USER = "kscodes";

public static String CONNECTION_PASSWORD = "kscodes";

public static void main(String[] args) {

String updateSql = "UPDATE employee_details SET salary = 12000 "

+ " WHERE designation = 'Engineer';";

try (Connection connection = getConnection();

Statement statement = connection.createStatement()) {

int rowCount = statement.executeUpdate(updateSql);

System.out.println("Record Updated successfully in database. Total reocrds Updated are :: "

+ rowCount);

} catch (SQLException e) {

System.out.println("An exception occurred while updating records in table. Exception is :: "+ e);

}

public static Connection getConnection() {

try {

Class.forName(DRIVER_CLASS_NAME);

} catch (ClassNotFoundException e) {

System.out.println("Error while registering JDBC driver");

return null;

}

Connection connection = null;

try {

connection = DriverManager.getConnection(CONNECTION_URL,

CONNECTION_USER, CONNECTION_PASSWORD);

} catch (SQLException e) {

System.out.println("Failed to create Connection");

return null;

}

System.out.println("Connection created Successfully.");

return connection;

}

Output

Connection created Successfully.
Record Updated successfully in database. Total reocrds Updated are :: 2

1 2	Connection created Successfully. Record Updated successfully in database. Total reocrds Updated are :: 2

Since we have JDK 7, we are using Try-with-resources Statement to handle the resources that are opened.

Reference

1. Statement executeUpdate()