Add a few data to the database in advance
Add a piece of data
<meta charset="utf-8">
<?php
// 链接数据库：需要链接的服务器，用户名和密码
mysql_connect("localhost", "root", 123456);
// 选择哪个数据库
mysql_selectdb("xiaobai");
// 设置字符集
mysql_query("SET NAMES UTF8");
// 向对应的数据库插入数据
$sql = "INSERT INTO form VALUES('小李',17,'男',1358995225,'[email protected]',88,'河北石家庄')";
//查询数据库中的数据
//$sql = "SELECT * FROM form";
//执行命令
mysql_query($sql);
?>At this time, every time a page is requested, a piece of data will be added to the database
The mysql_query() function executes a MySQL query
flow chart
Query data in the database
<meta charset="utf-8">
<?php
// 链接数据库：需要链接的服务器，用户名和密码
mysql_connect("localhost", "root", 123456);
// 选择哪个数据库
mysql_selectdb("xiaobai");
// 设置字符集
mysql_query("SET NAMES UTF8");
// 向对应的数据库插入数据
//$sql = "INSERT INTO form VALUES('小李',17,'男',1358995225,'[email protected]',88,'河北石家庄')";
//查询数据库中的数据
$sql = "SELECT * FROM form";
//执行命令
$result = mysql_query($sql);
echo $result;
print_r($result);
?>At this time, the output of this $result is an error, because echo and print_r output basic type values and arrays, and the return result of $result is not a basic type value, nor an array
So to convert the result to an array
The mysql_fetch_array() function gets a row from the result set as an associative array, or a numeric array, or both
$arr = mysql_fetch_array($result);
print_r($arr);
echo "<br/>";
I want to print all the contents of the array, but what is returned is a piece of data. After repeatedly executing the above command, I found
Print one item at a time. This is definitely unreasonable. The solution is to use a while loop to traverse all the data.
while($arr = mysql_fetch_array($result)) {
print_r($arr);
echo "<br/>";
}
The data is rendered into the table
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<style>
table,
td,
th {
border-collapse: collapse;
line-height: 30px;
border: 1px solid #333;
padding: 0 20px;
}
</style>
<body>
<?php
// 链接数据库：需要链接的服务器，用户名和密码
mysql_connect("localhost", "root", 123456);
//选择哪个数据库
mysql_selectdb("xiaobai");
// 设置字符集
mysql_query("SET NAMES UTF8");
// 向对应的数据库插入数据
$sql = "SELECT * FROM form";
$result = mysql_query($sql);
?>
<table>
<tr>
<th>姓名</th>
<th>年龄</th>
<th>性别</th>
<th>电话</th>
<th>邮箱</th>
<th>成绩</th>
<th>地址</th>
</tr>
<?php
while ($arr = mysql_fetch_array($result)) { ?>
<tr>
<td><?php print_r($arr['name']) ?></td>
<td><?php print_r($arr['age']) ?></td>
<td><?php print_r($arr['sex']) ?></td>
<td><?php print_r($arr['tel']) ?></td>
<td><?php print_r($arr['email']) ?></td>
<td><?php print_r($arr['score']) ?></td>
<td><?php print_r($arr['adress']) ?></td>
</tr>
<?php } ?>
</table>
</body>
</html>
Returns the number of results found
$num = mysql_num_rows($result);