jdbc（预编译插入数据）

package jdbc;

import java.sql.*;

public class Test2 {
    public static void main(String[] args) throws ClassNotFoundException, SQLException {
        //配置信息
        //useUnicode=true&characterEncoding=utf-8 解决中文乱码
        String url = "jdbc:mysql://localhost:3306/jdbc?useUnicode=true&characterEncoding=utf-8&serverTimezone=PRC";
        String username = "root";
        String password = "";

        //1加载驱动
        Class.forName("com.mysql.cj.jdbc.Driver");
        //2连接数据库
        Connection connection = DriverManager.getConnection(url,username,password);
        //3编写sql
        String sql = "insert into users(id,name,password,email,birthday)values (?,?,?,?,?)";
        //4预编译
        PreparedStatement ps = connection.prepareStatement(sql);
        ps.setInt(1,4);//第1个占位符？的值赋值为4
        ps.setString(2,"赵六");//第2个占位符？的值赋值为"赵六"
        ps.setString(3,"123456");//第3个占位符？的值赋值为"123456"
        ps.setString(4,"zl@qq.com");//第4个占位符？的值赋值为"zl@qq.com"
        ps.setDate(5,new Date(new java.util.Date().getTime()));//第5个占位符？的值赋值为"2000-08-09"
        //5执行sql
        int i = ps.executeUpdate();
        if (i>0){
            System.out.println("插入成功");
        }
        //6关闭连接，释放资源(一定要做)先开后关
        ps.close();
        connection.close();
    }
}