PHP學習筆記 1 資料庫的基本操作

1、連線資料庫

<?php

$servername = "localhost";
$username = "root";
$password = "root";
//建立連線
$conn = new mysqli($servername, $username, $password);
//檢測連線
if ($conn->connect_error) 
echo
"連線成功"
?>

<?php

$servername = "localhost";
$username = "root";
$password = "root";
//連線資料庫
$conn = new mysqli($servername, $username, $password);
if ($conn->error) 
//建立資料庫
$sql = "create database mydb";
if (mysqli_query($conn, $sql))  else 
//關閉資料庫
mysqli_close($conn);
?>

<?php

$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "mydb";
//建立連線
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) 
//建立資料庫表
$sql = "create table mygesture (
id int(6) unsigned auto_increment primary key ,
firstname varchar (30) not null ,
lastname varchar (30) not null ,
email varchar (30) not null ,
reg_date timestamp 
)";if ($conn->query($sql) == true)  else 
$conn->close();
?>

<?php

$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "mydb";
//建立連線
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) 
//插入資料
$sql = "insert into mygesture (firstname, lastname, email)
values ('yuan', 'can', '[email protected]')";
if ($conn->query($sql) == ture)  else 
//關閉資料庫
$conn->close();
?>

<?php

$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "mydb";
//建立連線
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) 
//插入資料
$sql = "insert into mygesture (firstname, lastname, email)
values ('yuan1', 'can1', '[email protected]');";
$sql .= "insert into mygesture (firstname, lastname, email)
values ('yuan2', 'can2', '[email protected]');";
$sql .= "insert into mygesture (firstname, lastname, email)
values ('yuan3', 'can3', '[email protected]');";
$sql .= "insert into mygesture (firstname, lastname, email)
values ('yuan4', 'can4', '[email protected]')";
if ($conn->multi_query($sql) == ture)  else 
//關閉資料庫
$conn->close();
?>

<?php

$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "mydb";
//建立連線
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) 
$sql = "select id, firstname ,lastname from mygesture";
$result = $conn->query($sql);
if ($result->num_rows > 0) 
} else 
//關閉資料庫
$conn->close();
?>

<?php

$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "mydb";
//建立連線
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) 
$result = mysqli_query($conn,"select * from mygesture where firstname = 'yuan'");
while ($row = mysqli_fetch_array($result))
//關閉資料庫
$conn->close();
?>

<?php

$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "mydb";
//建立連線
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) 
mysqli_query($conn, "update mygesture set firstname = 'huoshan'where lastname = 'can' ");
//關閉資料庫
$conn->close();
?>

<?php

$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "mydb";
//建立連線
$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) 
mysqli_query($conn, "delete from mygesture where lastname = 'can' ");
//關閉資料庫
$conn->close();
?>

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