Learning PHP--Two ways to connect to MySQL

Record two ways for PHP to connect to MySQL.

First mock the data and execute sql.

/*创建数据库*/
CREATE DATABASE IF NOT EXISTS `test`;

/*选择数据库*/
USE `test`;

/*创建表*/
CREATE TABLE IF NOT EXISTS `user` (
    name varchar(50),
    age int
);

/*插入测试数据*/
INSERT INTO `user` (name, age) VALUES('harry', 20), ('tony', 23), ('harry', 24);

The first is to use PHP’s native method to connect to the database. The code is as follows:

php
$host = 'localhost';
$database = 'test';
$username = 'root';
$password = 'root';
$selectName = 'harry';//要查找的用户名，一般是用户输入的信息

$connection = mysql_connect($host, $username, $password);//连接到数据库
mysql_query("set names 'utf8'");//编码转化
if (!$connection) {
    die("could not connect to the database.\n" . mysql_error());//诊断连接错误
}
$selectedDb = mysql_select_db($database);//选择数据库
if (!$selectedDb) {
    die("could not to the database\n" . mysql_error());
}
$selectName = mysql_real_escape_string($selectName);//防止SQL注入
$query = "select * from user where name = '$selectName'";//构建查询语句
$result = mysql_query($query);//执行查询
if (!$result) {
    die("could not to the database\n" . mysql_error());
}
while ($row = mysql_fetch_row($result)) {
    //取出结果并显示
    $name = $row[0];
    $age = $row[1];
    echo "Name: $name ";
    echo "Age: $age ";
    echo "\n";
}

The operating structure is as follows:

Name: harry Age: 20 
Name: tony Age: 23 

The second method is to use PDO to connect to the database. The code is as follows:

php
$host = 'localhost';
$database = 'test';
$username = 'root';
$password = 'root';
$selectName = 'harry';//要查找的用户名，一般是用户输入的信息

$pdo = new PDO("mysql:host=$host;dbname=$database", $username, $password);//创建一个pdo对象
$pdo->exec("set names 'utf8'");
$sql = "select * from user where name = ?";
$stmt = $pdo->prepare($sql);
$rs = $stmt->execute(array($selectName));

if ($rs) {
    // PDO::FETCH_ASSOC 关联数组形式
    // PDO::FETCH_NUM 数字索引数组形式
    while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
        $name = $row['name'];
        $age = $row['age'];
        echo "Name: $name ";
        echo "Age: $age ";
        echo "\n";
    }
}

$pdo = null;//关闭连接

The result is the same as the first one.

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