內容參考 mysqli的官網，和w3c英文版

1. mysqli 連接

<?php $servername = "localhost"; $username = "username"; $password = "password";// Create connection $conn = new mysqli($servername, $username, $password);// Check connection if ($conn->connect_error) {die("Connection failed: " . $conn->connect_error); } echo "Connected successfully"; ?>

1.a

mysqli:

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面向對象風格

mysqli::__construct?([?string?$host?= ini_get("mysqli.default_host")?[,?string?$username?= ini_get("mysqli.default_user")?[,?string?$passwd?= ini_get("mysqli.default_pw")?[,?string?$dbname?= ""?[,?int?$port?= ini_get("mysqli.default_port")?[,?string?$socket?= ini_get("mysqli.default_socket")?]]]]]] ) l?????????host：連接的服務器地址。 l?????????username：連接數據庫的用戶名，默認值是服務器進程所有者的用戶名。 l?????????passwd：連接數據庫的密碼，默認值為空。 l?????????dbname：連接的數據庫名稱。 l?????????port：TCP端口號。 l?????????socket：UNIX域socket。 2 create database <?php $servername = "localhost"; $username = "username"; $password = "password";// Create connection $conn = new mysqli($servername, $username, $password); // Check connection if ($conn->connect_error) {die("Connection failed: " . $conn->connect_error); } // Create database $sql = "CREATE DATABASE myDB"; if ($conn->query($sql) === TRUE) {echo "Database created successfully"; } else {echo "Error creating database: " . $conn->error; }$conn->close(); ?>

3. create table

<?php $servername = "localhost"; $username = "username"; $password = "password"; $dbname = "myDB";// Create connection $conn = new mysqli($servername, $username, $password, $dbname); // Check connection if ($conn->connect_error) {die("Connection failed: " . $conn->connect_error); } // sql to create table $sql = "CREATE TABLE MyGuests ( id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY, firstname VARCHAR(30) NOT NULL, lastname VARCHAR(30) NOT NULL, email VARCHAR(50), reg_date TIMESTAMP )";if ($conn->query($sql) === TRUE) {echo "Table MyGuests created successfully"; } else {echo "Error creating table: " . $conn->error; }$conn->close(); ?>

• NOT NULL - Each row must contain a value for that column, null values are not allowed
• DEFAULT value - Set a default value that is added when no other value is passed
• UNSIGNED - Used for number types, limits the stored data to positive numbers and zero
• AUTO INCREMENT - MySQL automatically increases the value of the field by 1 each time a new record is added
• PRIMARY KEY - Used to uniquely identify the rows in a table. The column with PRIMARY KEY setting is often an ID number, and is often used with AUTO_INCREMENT

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4. insert data

<?php $servername = "localhost"; $username = "username"; $password = "password"; $dbname = "myDB";// Create connection $conn = new mysqli($servername, $username, $password, $dbname); // Check connection if ($conn->connect_error) {die("Connection failed: " . $conn->connect_error); } $sql = "INSERT INTO MyGuests (firstname, lastname, email) VALUES ('John', 'Doe', 'john@example.com')";if ($conn->query($sql) === TRUE) {echo "New record created successfully"; } else {echo "Error: " . $sql . "<br>" . $conn->error; }$conn->close(); ?>

5. prepared statements

可以把一些常用的表達式存起來省的每次都query那么多

<?php $servername = "localhost"; $username = "username"; $password = "password"; $dbname = "myDB";// Create connection $conn = new mysqli($servername, $username, $password, $dbname);// Check connection if ($conn->connect_error) {die("Connection failed: " . $conn->connect_error); }// prepare and bind $stmt = $conn->prepare("INSERT INTO MyGuests (firstname, lastname, email) VALUES (?, ?, ?)"); $stmt->bind_param("sss", $firstname, $lastname, $email);// set parameters and execute $firstname = "John"; $lastname = "Doe"; $email = "john@example.com"; $stmt->execute();$firstname = "Mary"; $lastname = "Moe"; $email = "mary@example.com"; $stmt->execute();$firstname = "Julie"; $lastname = "Dooley"; $email = "julie@example.com"; $stmt->execute();echo "New records created successfully";$stmt->close(); $conn->close(); ?>

5.a?

bind_param :?

$stmt?=?$mysqli->prepare("INSERT?INTO?CountryLanguage?VALUES?(?,??,??,??)");
$stmt->bind_param('sssd',?$code,?$language,?$official,?$percent);

其中：

i corresponding variable has type integer
d corresponding variable has type double
s corresponding variable has type string
b corresponding variable is a blob and will be sent in packets

6. select data

<?php $servername = "localhost"; $username = "username"; $password = "password"; $dbname = "myDB";// Create connection $conn = new mysqli($servername, $username, $password, $dbname); // Check connection if ($conn->connect_error) {die("Connection failed: " . $conn->connect_error); } $sql = "SELECT id, firstname, lastname FROM MyGuests"; $result = $conn->query($sql);if ($result->num_rows > 0) {// output data of each rowwhile($row = $result->fetch_assoc()) {echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " " . $row["lastname"]. "<br>";} } else {echo "0 results"; } $conn->close(); ?>

6.a?

where：

example ：$sql = "SELECT * FROM MyGuests WHERE id = 2";

SELECT column FROM table
WHERE column operator value

運算符 說明
= 等于
!= 不等于
> 大于
< 小于
>= 大于或等于
<= 小于或等于
BETWEEN 介于一個包含范圍內
LIKE 搜索匹配的模式

6.b

ordered by

SELECT column_name(s)
FROM table_name
ORDER BY column_name

如果降序：

SELECT column_name(s)
FROM table_name
ORDER BY column_name DESC

如果多列（第一列相同，比第二列）：

SELECT column_name(s)
FROM table_name
ORDER BY column_name1, column_name2

6.c?

update:

UPDATE table_name
SET column_name = new_value
WHERE column_name = some_value

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6.d

delete：

DELETE FROM table_name
WHERE column_name = some_value

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轉載于:https://www.cnblogs.com/rabbitq/p/5846349.html

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