PHP学习笔记：PDO连接MySQL

$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;

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;