SQL ------ JDBC 刪除指定的某條記錄

package demo;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class DeleteCustomer
 */
@WebServlet("/delete.do")
public class DeleteCustomer extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public DeleteCustomer() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#service(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String CustomerID =request.getParameter("id");//獲取瀏覽器輸入的參數
		
		//設置數據庫連接參數
		String url="jdbc:mysql://localhost:3306/庫名?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT";
		String user = "用戶名";
		String password="密碼";
		
		//加載數據庫驅動
		try {
			Class.forName("com.mysql.jdbc.Driver");
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
		try(Connection connection =DriverManager.getConnection(url, user, password)){//連接數據庫
			//where一定有指明什么地方
			//sql語句刪除記錄 where表示條件,customers為表名
			String sql = "delete  from customers where CustomerID= ?;";
	            PreparedStatement statement = connection.prepareStatement(sql);//預處理sql語句
				
					//填入預處理語句得參數
			        statement.setInt(1, Integer.parseInt(CustomerID));
			        int value = statement.executeUpdate();//executeUpdate執行修改，將修改的個數傳給value
			        
			        statement.close();// 關閉statement，釋資源
			        
		}catch(SQLException e) {
			e.printStackTrace();
		}
		request.setAttribute("msg", "刪除成功！");
		request.getRequestDispatcher("queryalldata.jsp").forward(request, response);//跳轉到查詢所有得服務程序
	}

}