预编译SQL

public class TestJdbc2 {
    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";
        String username="root";
        String password="123456";

        //1.加载驱动
        Class.forName("com.mysql.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 preparedStatement = connection.prepareStatement(sql);
        preparedStatement.setInt(1,3);//给第一个占位符赋值 1
        preparedStatement.setString(2,"huhao");//给第二个占位符赋值 1
        preparedStatement.setString(3,"123456");//给第三个占位符赋值 1
        preparedStatement.setString(4,"48@qq.com");//给第四个占位符赋值 1
        preparedStatement.setDate(5,new Date(new java.util.Date().getTime()));//给第五个占位符赋值 1

        //执行SQL
        int i = preparedStatement.executeUpdate();
        if(i>0){
            System.out.println("插入成功！");
        }


        preparedStatement.close();
        connection.close();
    }
}

原文：https://www.cnblogs.com/huhao2000/p/11989344.html