本文目錄一覽：
- 1、PHP代碼連接mysql數據庫，我照着書上寫為什麼連接不上呢？
- 2、php代碼操作mysql數據庫
- 3、php中寫mysql語句
- 4、PHP讀取MySQL數據代碼～呢？
- 5、php表單寫入mysql數據庫的代碼
- 6、如何用PHP代碼實現MySQL數據庫的增刪改查
PHP代碼連接mysql數據庫，我照着書上寫為什麼連接不上呢？
就你上面的代碼來看，存在二方面錯誤：
1、or語句寫法錯誤，你的代碼中，所有的or語句都和它之前的代碼寫在一起，沒有空格，這是格式錯誤；
2、mysql_select_db函數被你寫成了
mysql_selcet_db
修改後的代碼：
?php
$host=”localhost”;
$user=”root”;
$password=”770880520″;
$dbase_name=”wei”;
$conn=mysql_connect($host,$user,$password)
or
die(“連接mysql服務器失敗”.mysql_error());
echo
“mysql服務器:$host
用戶名:$userbr”;
mysql_select_db($dbase_name,$conn)
or
die(“連接mysql數據庫失敗”.mysql_error());
echo”數據庫：$dbase_namebr”;
echo”連接mysql數據庫成功”;
?
如果還是運行錯誤，請貼出錯誤提示信息
php代碼操作mysql數據庫
form method=”post” action=”18.3_index.php” input type=”hidden” name=”savepost” value=”1″ / table width=”490″ height=”180″ border=”0″ cellpadding=”0″ cellspacing=”0″ tr td width=”490″ align=”center” height=”40″ colspan=”2″添加公告信息/td /tr tr td width=”90″ align=”center”公告主題:/td td width=”400″ height=”30″ align=”left” input name=”txt_title” type=”text” id=”txt_title” size=”40″ / * /td /tr tr td width=”90″ align=”center”公告內容:/td td width=”400″ height=”80″ align=”left”textarea name=”txt_content” id=”txt_content” cols=”50″ rows=”4″/textarea/td /tr tr td width=”490″ height=”30″ colspan=”2″ align=”center” input name=”submit1″ type=”submit” class=”btn_grey” value=”保存” onClick=”return check(form1)” / input name=”submit2″ type=”reset” value=”重置” / /td /tr /table /form ?php if (isset($_POST[‘savepost’]) $_SERVER[‘REQUEST_METHOD’] == ‘POST’) { $conn=mysql_connect(‘localhost’,’root’,”) or die
php中寫mysql語句
不管怎樣，在這裡我總結了常用的PHP連接MySQL數據庫以及讀取寫入數據庫的方法，希望能夠幫到你，當然也是作為我自己的一個回顧總結。
1.為了更好地設置數據連接,一般會將數據連接所涉及的值定義成變量.
?
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$mysql_server_name=’localhost’; //改成自己的mysql數據庫服務器
$mysql_username=’root’; //改成自己的mysql數據庫用戶名
$mysql_password=’123456′; //改成自己的mysql數據庫密碼
$mysql_database=’Mydb’; //改成自己的mysql數據庫名
也可把以上變量放在一個文件里,可以隨時讓其他文件調用.
例如: 將以上內容放在:db_config.php 那麼在其他需要用到數據庫的頁面直接調用.
調用代碼:require(“db_config.php”);
2.連接數據庫
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$conn=mysql_connect($mysql_server_name,$mysql_username,$mysql_password) or die(“error connecting”) ; //連接數據庫
mysql_query(“set names ‘utf8′”); //數據庫輸出編碼 應該與你的數據庫編碼保持一致.南昌網站建設公司百恆網絡PHP工程師建議用UTF-8 國際標準編碼.
mysql_select_db($mysql_database); //打開數據庫
$sql =”select * from news “; //SQL語句
$result = mysql_query($sql,$conn); //查詢
3.讀取表中的內容,這裡我們用while,可以根據具體情況,用for 或其他的.
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while($row = mysql_fetch_array($result))
{
echo “div style=\”height:24px; line-height:24px; font-weight:bold;\””; //排版代碼
echo $row[‘Topic’] . “br/”;
echo “/div”; //排版代碼
}
4.php寫入數據庫,Mysql數據的寫入
PHP讀取MySQL數據代碼～呢？
新建view.php文件，其內容為：
?php
$link=mysql_connect(“localhost”,”root”,”之前的管理員密碼”);
if(!$link) echo “沒有連接成功!”;
else echo “連接成功!”;
?
這樣，我們便連接上了MySQL數據庫，接下來，就是數據讀取部分的代碼，根據我的MySQL數據源表結構的介紹，我們試驗性的來讀取：
depart varchar(45) 部門名稱
ename varchar(45) 員工姓名
pcname varchar(45) PC名稱
這三段數據。
在view.php中緊接着前邊的代碼繼續寫：
?php
mysql_select_db(“infosystem”, $link); //選擇數據庫
$q = “SELECT * FROM info”; //SQL查詢語句
mysql_query(“SET NAMES GB2312”);
$rs = mysql_query($q, $link); //獲取數據集
if(!$rs){die(“Valid result!”);}
echo “table”;
echo “trtd部門名稱/tdtd員工姓名/tdtdPC名稱/td/tr”;
while($row = mysql_fetch_row($rs)) echo “trtd$row[1]/tdtd$row[2]/tdtd$row[3]/td/tr”; //顯示數據
echo “/table”;
mysql_free_result($rs); //關閉數據集
?
其中，“infosystem”為數據庫名，“info”為表名。大家可以根據自己的情況酌情修改。
接着，運行它~怎麼樣~數據是不是順利被讀取了呢？
php表單寫入mysql數據庫的代碼
!–表單文件，拷入index.php–
!DOCTYPE html
html
head
style
label{display:inline-block;width:100px;margin-bottom:10px;}
/style
titleAdd students/title
/head
body
!– 數據庫用mysqli 面向過程調用方法–
form method=”post” action=”write2db.php”
!–數據庫用mysqli 面向過程調用方法
form method=”post” action=”write2db_sqlio.php”
—
!–數據庫用PDO調用方法
form method=”post” action=”write2db_pdo.php”
—
labelFirst Name/label
input type=”text” name=”first_name” /
br /
labelLast Name/label
input type=”text” name=”last_name” /
br /
labeldepartment/label
input type=”text” name=”department” /
br /
labelEmail/label
input type=”text” name=”email” /
br /
input type=”submit” value=”Add students”
/form
/body
/html
——————————
?php
//拷貝命名為write2db.php,數據庫用mysqli 面向過程調用方法
//print_r($_POST);
// create a variable
$first_name=$_POST[‘first_name’];
$last_name=$_POST[‘last_name’];
$department=$_POST[‘department’];
$email=$_POST[’email’];
//調試用
echo “Your input: “;
echo $first_name;
echo ‘br /’;
echo $last_name;
echo ‘br /’;
echo $department;
echo ‘br /’;
echo $email;
echo ‘br /’;
$servername = “localhost”;
//Your database username and password
//$username = “username”;
//$password = “password”;
$username = “tester”;
$password = “testerPassword”;
//your database name
$dbname = “test”;
$tablename =”student”;
// Create connection
$connect = mysqli_connect($servername, $username, $password, $dbname);
if (!$connect) {
die(“Connection failed: ” . mysqli_connect_error());
}
//Execute the query
$sql=”INSERT INTO $tablename (first_name,last_name,department,email)
VALUES(‘$first_name’,’$last_name’,’$department’,’$email’)”;
if (mysqli_query($connect, $sql)) {
echo “Hooray! New record is inserted to database successfully. Please check database.”;
} else {
echo “Error: ” . $sql . “br /” . mysqli_error($connect);
}
mysqli_close($connect);
?
?php
//拷貝命名為write2db_sqlio.php,數據庫用mysqli 面向對象調用方法
//print_r($_POST);
// create a variable
$first_name=$_POST[‘first_name’];
$last_name=$_POST[‘last_name’];
$department=$_POST[‘department’];
$email=$_POST[’email’];
//調試用
echo “Your input: “;
echo $first_name;
echo ‘br /’;
echo $last_name;
echo ‘br /’;
echo $department;
echo ‘br /’;
echo $email;
echo ‘br /’;
$servername = “localhost”;
//Your database username and password
//$username = “username”;
//$password = “password”;
$username = “tester”;
$password = “testerPassword”;
//database name
$dbname = “test”;
$tablename =”student”;
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn-connect_error) {
die(“Connection failed: ” . $conn-connect_error);
}
$sql=”INSERT INTO $tablename (first_name,last_name,department,email)
VALUES(‘$first_name’,’$last_name’,’$department’,’$email’)”;
if ($conn-query($sql) === TRUE) {
echo “New record created successfully”;
} else {
echo “Error: ” . $sql . “br” . $conn-error;
}
$conn-close();
?
?php
//拷貝為文件write2db_pdo.php,數據庫用PDO調用方法
//print_r($_POST);
a variable
$first_name=$_POST[‘first_name’];
$last_name=$_POST[‘last_name’];
$department=$_POST[‘department’];
$email=$_POST[’email’];
//調試用
echo “Your input: “;
echo $first_name;
echo ‘br /’;
echo $last_name;
echo ‘br /’;
echo $department;
echo ‘br /’;
echo $email;
echo ‘br /’;
$servername = “localhost”;
//Your database username and password
//$username = “username”;
//$password = “password”;
$username = “tester”;
$password = “testerPassword”;
//your database name
$dbname = “test”;
$tablename =”student”;
// Create connection
try {
$conn = new PDO(“mysql:host=$servername;dbname=$dbname”, $username, $password);
// set the PDO error mode to exception
$conn-setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql=”INSERT INTO $tablename (first_name,last_name,department,email)
VALUES(‘$first_name’,’$last_name’,’$department’,’$email’)”;
// use exec()
$conn-exec($sql);
echo “New record created successfully”;
}
catch(PDOException $e)
{
echo $sql . “br” . $e-getMessage();
}
$conn = null;
?
–創建數據庫test, 將此文件存為test.sql 導入數據庫，或者手動創建表結構
— phpMyAdmin SQL Dump
— version 4.7.4
—
—
— Host: 127.0.0.1:3306
— Generation Time: Mar 12, 2018 at 04:04 AM
— Server version: 5.7.19
— PHP Version: 7.1.9
SET SQL_MODE = “NO_AUTO_VALUE_ON_ZERO”;
SET AUTOCOMMIT = 0;
START TRANSACTION;
SET time_zone = “+00:00”;
/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;
—
— Database: `test`
—
— ——————————————————–
—
— Table structure for table `student`
—
DROP TABLE IF EXISTS `student`;
CREATE TABLE IF NOT EXISTS `student` (
`id` tinyint(3) UNSIGNED NOT NULL AUTO_INCREMENT,
`first_name` varchar(20) NOT NULL,
`last_name` varchar(20) NOT NULL,
`department` varchar(50) NOT NULL,
`email` varchar(50) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
—
— Dumping data for table `student`
—
INSERT INTO `student` (`id`, `first_name`, `last_name`, `department`, `email`) VALUES
(1, ‘first1’, ‘last1’, ‘cs’, ‘1985@qq.com’);
COMMIT;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
如何用PHP代碼實現MySQL數據庫的增刪改查
?php
$con = mysql_connect(“localhost:3306″,”root”,””);
if (!$con) {
die(‘Could not connect: ‘ . mysql_error());
}
mysql_select_db(“test”, $con);
$result = mysql_query(“SELECT * FROM user”);
echo “table border=’1′
tr
thUsername/th
thPassword/th
/tr”;
while($row = mysql_fetch_array($result)) {
echo “tr”;
echo “td” . $row[‘username’] . “/td”;
echo “td” . $row[‘password’] . “/td”;
echo “/tr”;
}
echo “/table”;
mysql_close($con);
?
從服務器中獲取用戶所有信息（SQL SELECT語句）並以表格形式出現
?php
$con = mysql_connect(“localhost”,”root”,””);
if (!$con) {
die(‘Could not connect: ‘ . mysql_error());
}
mysql_select_db(“test”, $con);
mysql_query(“DELETE FROM user WHERE username = ‘$_POST[username]'”);
mysql_close($con);
?
刪除該用戶所有信息delete.php
?php
$con = mysql_connect(“localhost:3306″,”root”,””);
if (!$con) {
die(‘Could not connect: ‘ . mysql_error());
}
mysql_select_db(“test”, $con);
$sql = “INSERT INTO user (username,password)
VALUES
(‘$_POST[username]’,’$_POST[password]’)”;
if (!mysql_query($sql,$con)) {
die(‘Error: ‘ . mysql_error());
}
echo “1 record added”;
mysql_close($con);
?
註冊一個新用戶insert.php
?php
$con = mysql_connect(“localhost”,”root”,””);
if (!$con) {
die(‘Could not connect: ‘ . mysql_error());
}
mysql_select_db(“test”, $con);
mysql_query(“UPDATE user SET password = ‘$_POST[password]’ WHERE username = ‘$_POST[username]'”);
mysql_close($con);
?
修改一個用戶密碼update.php
html
head
titleFORM/title
/head
body
br /
h1Insert:/h1
form action=”insert.php” method=”post”
username:input type=”name” name=”username”/
br /
password:input type=”password” name=”password”/
input type=”submit” value=”submit”/
/form
br /hr /br /
h1Delete/h1
form action=”delete.php” method=”post”
username:input type=”name” name=”username” /
br /
Are you sure?input type=”submit” value=”sure” /
/form
br /hr /br /
h1Update/h1
form action=”update.php” method=”post”
username:input type=”name” name=”username”/
br /
You want to change your password into:input type=”password” name=”password”/
input type=”submit” value=”submit”/
/form
br /hr /br /
/body
/html
以上三個功能的提交源Operate.html
原創文章，作者：小藍，如若轉載，請註明出處：https://www.506064.com/zh-hant/n/236527.html
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