Java JDBC連接數據庫 UPDATE更新

package com.edu;
import java.sql.*;//導入包

public class TestUpdate {

	public static void main(String[] args) {
		try {
			//加載並註冊驅動程序
			Class.forName("com.mysql.jdbc.Driver");
			//定義連接字符串
			String url="jdbc:mysql:///test";
			//連接數據庫
			Connection conn=DriverManager.getConnection(url, "root", "root");
			//sql語句
			String sql="update users set name=?,sex=?,age=?,addr=? where name=?";
			//預置對象
			PreparedStatement pstmt=conn.prepareStatement(sql);
			//設置佔位符值
			pstmt.setString(1, "張三");
			pstmt.setString(2, "男");
			pstmt.setInt(3, 20);
			pstmt.setString(4, "成都市新都區");
			pstmt.setString(5, "lili");
			
			//執行sql語句，返回影響行數
			int res=pstmt.executeUpdate();
			if(res>0){
				System.out.println("更新數據成功");
			}
			pstmt.close();
			conn.close();
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}