How to display only one data in the table in php page

The php page only displays one data in the table. You need to connect to the database, write a SQL query statement to obtain the data, and use PHP code to display the data on the page. Detailed introduction: 1. Connect to the database, you can use extensions such as mysqli or PDO to connect to the database; 2. Write SQL query statements to obtain data, use the SELECT statement to select the "name" column in the table, and use LIMIT 1 to limit The result set only returns one data and so on.

The operating environment of this tutorial: windows10 system, php8.1.3 version, DELL G3 computer.

In PHP development, sometimes we only need to display a piece of data in the database table instead of the contents of the entire table. This can be achieved using SQL queries and PHP code. This article will introduce how to display only one data from a database table in a PHP page.

1. We need to connect to the database. In PHP, you can use extensions such as mysqli or PDO to connect to the database. The following is sample code to connect to the database using the mysqli extension:

$servername = "localhost";
$username = "root";
$password = "";
$dbname = "mydb";
// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);
// 检查连接是否成功
if ($conn->connect_error) {
die("连接失败: " . $conn->connect_error);
}
?>

In the above code, we used localhost as the server name, root as the user name, empty password, and mydb as the database name. You need to modify these values ​​according to your own database settings.

2. We need to write a SQL query statement to obtain a data in the table. The following is a simple example, assuming we have a table named "users", which has a column named "name", and we want to get a data in this column:

$sql = "SELECT name FROM users LIMIT 1";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// 输出数据
while($row = $result->fetch_assoc()) {
echo "Name: " . $row["name"];
}
} else {
echo "没有数据";
}
?>

In the above In the code, we use the SELECT statement to select the "name" column in the table and use LIMIT 1 to limit the result set to return only one data. We then use $result->fetch_assoc() to get the associative array of query results, and $row["name"] to access the value of the "name" column.

3. We can display the obtained data on the page. In the above code, we use the echo statement to output data. You can modify the output method and style according to your own needs.

After completing the above steps, we can save the above code as a PHP file and access the file in the browser to see a page that only displays one data in the table.

To summarize, to display only one data from a database table in a PHP page, we need to connect to the database, write a SQL query statement to obtain the data, and use PHP code to display the data on the page. In this way, the function of displaying only one data can be realized. .

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