本例以JDBC 和 MY SQL DataBase为基础，来演示执行SQL来更新数据，使用Statement和Prepared Statement两种方式。

一，示例代码

连接数据库uilt: MySqlJDBSUtil.java 
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package com.devnp.jdbc;

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

public class MySqlJDBSUtil {
	private static String driver = "com.mysql.jdbc.Driver";
	private static String url = "jdbc:mysql://127.0.0.1:3306/test?characterEncoding=utf8";
	private static String userName = "root"; // base on your login user name
	private static String password = "!qaz2wsx"; // base on your login user

	public static Connection getConnection() {
		
		Connection connection = null;
		try {
			Class.forName(driver);
			connection = DriverManager.getConnection(url, userName, password);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return connection;
	}

	public static void connectionClose(Connection connection) {
		if (connection != null) {
			try {
				connection.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
	}
}

更新数据代码：
JDBCUpdateRecord.java

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package com.devnp.jdbc;

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

public class JDBCUpdateRecord {

	public static void main(String[] args) throws SQLException {
		updateDbTableWithStatement();
		updateDbTableWithPreparedStatement();
	}

	public static void updateDbTableWithStatement() throws SQLException {
		Connection dbConnection = null;
		Statement statement = null;

		String updateTableSQL = "UPDATE USER_INFO SET USERNAME = 'duliu' "
				+ " WHERE USER_ID = 1";

		try {
			dbConnection = MySqlJDBSUtil.getConnection();
			statement = dbConnection.createStatement();

			System.out.println(updateTableSQL);

			// execute update SQL stetement
			statement.execute(updateTableSQL);

			System.out.println("Updated USER_INFO table record is Success!");

		} catch (SQLException e) {

			e.printStackTrace();

		} finally {

			if (statement != null) {
				statement.close();
			}

			if (dbConnection != null) {
				dbConnection.close();
			}

		}

	}
	
	public static void updateDbTableWithPreparedStatement() throws SQLException {
		Connection dbConnection = null;
		PreparedStatement preparedStatement = null;

		String updateTableSQL = "UPDATE DBUSER SET USERNAME = ? "
				                  + " WHERE USER_ID = ?";

		try {
			dbConnection = MySqlJDBSUtil.getConnection();
			preparedStatement = dbConnection.prepareStatement(updateTableSQL);

			preparedStatement.setString(1, "duliu");
			preparedStatement.setInt(2, 2);

			// execute update SQL stetement
			preparedStatement.executeUpdate();

			System.out.println("Updated USER_INFO table record is Success!");

		} catch (SQLException e) {

			e.printStackTrace();

		} finally {

			if (preparedStatement != null) {
				preparedStatement.close();
			}

			if (dbConnection != null) {
				dbConnection.close();
			}

		}
	}
}

二，测试

测试结果： 
UPDATE USER_INFO SET USERNAME = 'duliu' WHERE USER_ID = 1
 Updated USER_INFO table record is Success!
 Updated USER_INFO table record is Success!
数据库更新: