SQL -------- JDBC 修改某条记录得内容

package demo;

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

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

	/**
	 * @see HttpServlet#service(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		//获取修改后的参数
		String CustomerID =request.getParameter("CustomerID");
		String CustomerName = request.getParameter("CustomerName");
		String ContactName= request.getParameter("ContactName");
		String Address = request.getParameter("Address");
		String City = request.getParameter("City");
		String PostalCode = request.getParameter("PostalCode");
		String Country=request.getParameter("Country");
		
		//设置数据库连接参数
		String url="jdbc:mysql://localhost:3306/库名?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT";
		String user = "用户名";
		String password="密码";
		
		//加载数据库驱动
		try {
			Class.forName("com.mysql.jdbc.Driver");
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
		try(Connection connection =DriverManager.getConnection(url, user, password)){//连接数据库
			//where指定条件
			//修改sql语句,customers为表名
			 String sql = "update Customers set CustomerName=?, ContactName=?, Address=?,City=?, PostalCode=?,Country=? where customerID=?;";
	            PreparedStatement statement = connection.prepareStatement(sql);//预处理sql语句
					//以下语句对应VALUES语句里的值
			        statement.setString(1, CustomerName);
			        statement.setString(2, ContactName);
			        statement.setString(3, Address);
			        statement.setString(4, City);
			        statement.setString(5, PostalCode);
			        statement.setString(6, Country);
			        statement.setInt(7, Integer.parseInt(CustomerID));
			        int value = statement.executeUpdate();//executeUpdate执行修改，将修改的个数传给value
			        
			        statement.close();// 关闭statement，释资源
			        
		}catch(SQLException e) {
			e.printStackTrace();
		}
		request.getRequestDispatcher("queryalldata.jsp").forward(request, response);//跳转到查询所有得服务程序
	}

}