PHP学习笔记：PDO连接MySQL

作业要做一个网页系统，临时需要用到PHP，现学一下。PHP+IIS+MySQL的环境配置等会上。

需要开启插件支持。

数据库变量

$servername = "localhost";      //数据库地址
$username = "daya";
$password = "123456";
$dbname="Person";     //数据库名
$tbname="Info";     //表名

创建表

try {
    //连接数据库，返回连接对象
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);

    //设置连接属性
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    //SQL操作语句
    $sql_opt = "CREATE TABLE $tbname (
    id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,  /*无符号自增整形*/
    name VARCHAR(30) NOT NULL,     /*非空字符串*/
    phone_number VARCHAR(50),
    reg_date TIMESTAMP
    )";

    //执行
    $conn->exec($sql_opt);
    echo "数据表 $tbname 创建成功<br>";
}
catch(PDOException $e)
{
    echo $sql_opt . "<br>" . $e->getMessage()."<br>";
}

//销毁连接对象
$conn = null;

插入条目

try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);

    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $sql_opt = "INSERT INTO 
    $tbname (name, phone_number)
    VALUES ('John', '1552909***1');";
    $sql_opt .= "INSERT INTO 
    $tbname (name, phone_number)
    VALUES ('Mary',  '1552909***2');";
    $sql_opt .= "INSERT INTO 
    $tbname (name, phone_number)
    VALUES ('Julie',  '1552909***3')";

    $conn->exec($sql_opt);
    echo "新记录插入成功<br>";
}
catch(PDOException $e)
{
    echo $sql_opt . "<br>" . $e->getMessage();
}

$conn = null;

查询条目

try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);

    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $sql_opt = "SELECT *
                FROM $tbname";
    $res=$conn->query($sql_opt);

    // 输出整个条目
    // while($row = $res->fetch(PDO::FETCH_ASSOC)){
    //     print_r($row);
    //     echo "<br>";
    // }

    //只输出条目关键信息
    $res=$res->fetchall(PDO::FETCH_ASSOC);
    foreach($res as $row){
        echo $row['id']." ".$row['name']." ".$row['phone_number']." ".$row['reg_date']."<br>";
    }
}
catch(PDOException $e)
{
    echo $sql_opt . "<br>" . $e->getMessage();
}

$conn = null;

整个条目的输出为：

关键信息的输出为：

删除条目

try {
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);

    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $sql_opt = "DELETE 
                FROM $tbname
                WHERE name='John'";
    $conn->exec($sql_opt);
    echo "删除成功<br>";
}
catch(PDOException $e)
{
    echo $sql_opt . "<br>" . $e->getMessage();
}

$conn = null;