Head First PHP&MySQL 学习笔记（二） —— 创建和填充数据库
PHP中如何查询并显示结果
mysqli_fetch_array + while循环
mysqli_fetch_array
<?php
$query = "SELECT * from email_list";
$result = mysqli_query($dbc, $query); /* $result 变量不包含任何查询数据，保存的是SQL查询的资源ID。每个SQL查询都有自己的资源ID，用于访问和查询结果关联的数据 */
$row = mysqli_fetch_array($result); /* 获取查询到的数据并存储到数组$row中，每次一行。数组$row的数组下标是表的列名 */
?>
while循环
<?php
while ($row = mysqli_fetch_array($result))
{
$firstname = $row['first_name'];
$lastname = $row['last_name'];
$msg = "Dear $firstname $lastname,\n$text";
$to = $row['email'];
mail($to, $subject, $msg, 'From:' . $from); /* 发送email，要想成功发送email需要安装和配置sendmail */
echo 'Email sent to:' . $to . '<br />';
}
?>
MySQL 脚本
CREATE DATABASE elvis_store; USE elvis_store; CREATE TABLE email_list ( first_name VARCHAR(20), last_name VARCHAR(20), email VARCHAR(60) ); DESCRIBE email_list; /* 删除一个表和其中的所有数据 */ DROP TABLE email_list; /* 修改一个表的定义 ALTER TABLE email_list ...; */ CREATE TABLE `email_list` ( `id` INT AUTO_INCREMENT, `first_name` VARCHAR(20), `last_name` VARCHAR(20), `email` VARCHAR(60), PRIMARY KEY (`id`) );
示例程序
向数据库中添加数据
<?php
$dbc = mysqli_connect('localhost', 'root', '123456', 'elvis_store')
or die('Error connecting to MySQL server.');
$firstname = $_POST['firstname'];
$lastname = $_POST['lastname'];
$email = $_POST['email'];
$query = "INSERT INTO email_list(first_name, last_name, email)" .
"VALUES('$firstname', '$lastname', '$email')";
mysqli_query($dbc, $query) or die("Error querying database.");
echo "Customer added:\n $firstname, \n $lastname, \n $email"
?>
查询表中的数据
<?php
$from = '[email protected]';
$dbc = mysqli_connect('localhost', 'root', '123456', 'elvis_store')
or die('Error connecting to MySQL server.');
$subject = $_POST['subject'];
$text = $_POST['elvismail'];
$query = "SELECT* FROM email_list";
$result = mysqli_query($dbc, $query) or die("Error querying database.");
while ($row = mysqli_fetch_array($result))
{
$firstname = $row['first_name'];
$lastname = $row['last_name'];
$msg = "Dear $firstname $lastname,\n$text";
$to = $row['email'];
mail($to, $subject, $msg, 'From:' . $from); /* Note: sendmail need installed the configured correctly */
echo 'Email sent to:' . $to . '<br />';
}
mysqli_close($dbc);
//echo "Customer added:\n $firstname, \n $lastname, \n $emal"
?>
删除表中数据
<?php
$dbc = mysqli_connect('localhost', 'root', '123456', 'elvis_store')
or die('Error connecting to MySQL server.');
$email = $_POST['email'];
$query = "DELETE FROM email_list WHERE email='$email'";
//echo "$query";
mysqli_query($dbc, $query) or die("Error querying database.");
echo "Customer deleted: $email";
?>