PHP MySQL reads data

Reading data from MySQL database

We have learned to add data to the database. In this section, we will talk about how to read the data from the database and display it on the page?

To query data, use select

: "*" is a regular expression The expression is written to match all

Instanceus Query the data we added to the MyGuests table and display it on the page

<?php
 header("Content-type:text/html;charset=utf-8");    //设置编码
 $servername = "localhost";
 $username = "root";
 $password = "root";
 $dbname = "test";
 
 // 创建连接
 $conn = new mysqli($servername, $username, $password, $dbname);
 // 检测连接
 if ($conn->connect_error) {
     die("连接失败: " . $conn->connect_error);
 }
 
 $sql = "SELECT * FROM MyGuests";
 $result = $conn->query($sql);
 
 if ($result->num_rows > 0) {
     // 输出每行数据
     while($row = $result->fetch_assoc()) {
         echo "id: ". $row["id"]. " - Name: ". $row["firstname"]. "   " . $row["lastname"] ."   ".$row['email'] ."<br/>";
     }
 } else {
     echo "0 个结果";
 }
 $conn->close();
 ?>

The program running results:

See if it is our MyGuests table The data inside

<?php
 header("Content-type:text/html;charset=utf-8");    //设置编码
 $servername = "localhost";
 $username = "root";
 $password = "root";
 $dbname = "test";
 
 // 创建连接
 $conn = new mysqli($servername, $username, $password, $dbname);
 // 检测连接
 if ($conn->connect_error) {
     die("连接失败: " . $conn->connect_error);
 }
 
 $sql = "SELECT firstname,email FROM MyGuests";
 $result = $conn->query($sql);
 
 if ($result->num_rows > 0) {
     // 输出每行数据
     while($row = $result->fetch_assoc()) {
         echo  " - Name: ". $row["firstname"]. "--------".$row['email'] ."<br/>";
     }
 } else {
     echo "0 个结果";
 }
 $conn->close();
 ?>

We only need to

* Just change it to a specific field:
Program running result:

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