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怎么用PHP代码修改数据库里面的数据？
举例如下：
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创建userinfo_update.php页面用于查询用户信息，先显示信息，在修改：
先通过GET获取用户编号查询用户信息：
$sql = "select * from user_info where user_id='".$_GET['userId']."'";
$result = mysql_query($sql,$con);
if($row = mysql_fetch_array($result)){
}
页面效果：
创建update.php文件，用于修改用户信息：
使用到了mysql_affected_rows() 函数返回前一次 MySQL 操作所影响的记录行数。
//通过post获取页面提交数据信息
$userId = $_POST[userId];
$userName = $_POST[userName];
$userAge = $_POST[userAge];
$sql = "update user_info set user_name='".$userName."',user_age=".$userAge." where user_id='".$userId."'";
mysql_query($sql,$conn);//执行SQL
$mark = mysql_affected_rows();//返回影响行数
$url = "userinf_select.php";
运行结果
创建delete.php文件,完成删除用户信息功能：
$userId = $_GET['userId'];
include 'connection.php';
$sql = "delete from user_info where user_id='".$userId."'";
mysql_query($sql,$con);
$mark = mysql_affected_rows();//返回影响行数
if($mark0){
echo "删除成功";
}else{
echo "删除失败";
}
mysql_close($con);
运行结果：
求PHP从数据库中读取内容并存入文件和从文件读取数据插入数据库的代码
//第一种
?php
$conn = mysql_connect("主机名","用户名","密码");
mysql_select_db("数据库名",$conn);
$sql = "select * from user";
$result = mysql_query($sql);
$data="";
while($row = mysql_fetch_row($result)){
foreach($row as $v){
$data .=$v."|"; //加个树线隔开字段
}
nl2br($data); //读完一行回车
}
file_put_contents("abc.txt",$data);
//第二种
?php
$filename = "abc.txt";
$res = fopen($filename,"r");
while(!feof($res)){
$buffer = fgets($res);
$buffer = str_replace(' ', '|', $buffer);
$array = explode('|', $buffer);
foreach($array as $v){
if(strlen($v)0){
$arr[] = $v;
}
}
}
fclose($res);
//组装数组插入数据库就可以了
怎么使用php代码建立mysql数据库
$rs = mysql_select_db($dbname,$conn);
if(!$rs){
$rs = mysql_query("CREATE DATABASE `$dbname`; ",$conn);
if(!$rs){
$errstr = GetBackAlert("数据库 {$dbname} 不存在，也没权限创建新的数据库！");
echo $errstr;
exit();
}else{
$rs = mysql_select_db($dbname,$conn);
if(!$rs){
$errstr = GetBackAlert("你对数据库 {$dbname} 没权限！");
echo $errstr;
exit();
}else{
$ctStr = 'CREATE TABLE `wish` (
`id` int(11) NOT NULL auto_increment,
`pname` varchar(30) default NULL,
`pqq` varchar(10) default NULL,
`plocal` varchar(50) default NULL,
`pemail` varchar(30) default NULL,
`context` tinytext,
`addDate` datetime default NULL,
`biz1` varchar(250) default NULL,
`biz2` varchar(250) default NULL,
`biz3` varchar(250) default NULL,
`biz4` varchar(250) default NULL,
`biz5` varchar(250) default NULL,
`biz6` int(11) default NULL,
`biz7` int(11) default NULL,
`biz8` int(11) default NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=gbk;';
mysql_query($ctStr,$conn);
}
}
PHP源代码连接数据库
数据库有很多种类：mysql，oracle，mssql，db2等等。PHP操作数据库的时候，要保证该类型数据库的扩展已开启。这里连接的数据库以mysql为例：
?php
//数据库服务器地址
$host="localhost";
//连接数据库用户名
$uname="root";
//连接数据库密码
$upass="";
//连接数据库
$conn=mysql_connect($host, $uname,$upass);
//判断连接
if(!$conn){
die("连接数据库失败！").mysql_errno();
}
//连接成功，其他操作省略
?
php表单写入mysql数据库的代码
!--表单文件，拷入index.php--
!DOCTYPE html
html
head
style
label{display:inline-block;width:100px;margin-bottom:10px;}
/style
titleAdd students/title
/head
body
!-- 数据库用mysqli 面向过程调用方法--
form method="post" action="write2db.php"
!--数据库用mysqli 面向过程调用方法
form method="post" action="write2db_sqlio.php"
--
!--数据库用PDO调用方法
form method="post" action="write2db_pdo.php"
--
labelFirst Name/label
input type="text" name="first_name" /
br /
labelLast Name/label
input type="text" name="last_name" /
br /
labeldepartment/label
input type="text" name="department" /
br /
labelEmail/label
input type="text" name="email" /
br /
input type="submit" value="Add students"
/form
/body
/html
------------------------------
?php
//拷贝命名为write2db.php,数据库用mysqli 面向过程调用方法
//print_r($_POST);
// create a variable
$first_name=$_POST['first_name'];
$last_name=$_POST['last_name'];
$department=$_POST['department'];
$email=$_POST['email'];
//调试用
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($connect);
?
?php
//拷贝命名为write2db_sqlio.php,数据库用mysqli 面向对象调用方法
//print_r($_POST);
// create a variable
$first_name=$_POST['first_name'];
$last_name=$_POST['last_name'];
$department=$_POST['department'];
$email=$_POST['email'];
//调试用
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;
}
$conn-close();
?
?php
//拷贝为文件write2db_pdo.php,数据库用PDO调用方法
//print_r($_POST);
a variable
$first_name=$_POST['first_name'];
$last_name=$_POST['last_name'];
$department=$_POST['department'];
$email=$_POST['email'];
//调试用
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;
?
--创建数据库test, 将此文件存为test.sql 导入数据库，或者手动创建表结构
-- 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 */;
PHP文件在网页里显示部分php代码（想显示数据库表里面的数据）
因为你少写了一个大括号的结尾。
修改后：
table id="DataList1" cellspacing="0" border="0" width="100%"
?php
$db = mysqli_connect('localhost', 'root','root');//连接MySQL服务器
mysqli_select_db($db,'ticket');//选择数据库文件
if(mysqli_connect_errno()){
echo "Error:Could not connect to mysql ticket"; exit;
}
$q="select * from news";//设置查询指令
$result=mysql_query($db,$q);//执行查询
while($row=mysql_fetch_assoc($result)) //将result结果集中查询结果取出一条
{
echo"trtd".$row["news"]."/tdtd".$row["date"]."/td/tr"; exit;
}
} // 就是这样？
?
/table
谢谢谢谢谢谢码密。的入输要需所面。界理管台后器。由路陆登是。码密理管。廖仲庭。器由。路。
本文名称：数据库文件php代码,数据库文件php代码大全
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