php用mysql怎么写,phpmysql是什么

PHP操作MySQL，删除一行数据库，怎么写？

删除一条记录简单方法，应该说是最简单的入门级的了.

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mysqldelete from 表名 where id=1;

query ok,

这样就可以删除了，

如果你和php教程 mysql配置只要利用php连接到数据库教程再用php mysql_query("delete from 表名 where id=1");就可以删除了。

?php

$con = mysql_connect("localhost","peter","abc123");

if (!$con)

{

die('could not connect: ' . mysql_error());

}

mysql_select_db("my_db", $con);

mysql_query("delete from person where lastname='griffin'");

mysql_close($con);

下面看一下关于mysql delete语法.

删除数据库中的数据

delete from 语句用于从数据库表中删除记录。

语法

delete from table_name

where column_name = some_value

注释：sql 对大小写不敏感。delete from 与 delete from 等效。

为了让 php 执行上面的语句，我们必须使用 mysql_query( 函数。该函数用于向 sql 连接发送查询和命令

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 */;

用php将mysql的表查询出来，该怎么写，用来考二级mysql的

?php

$link=mysql_connect('localhost','mysql_user','mysql_password');//mysql的服务器地址，数据库账号，数据库密码该方法用于链接数据库

if(!$link){

die('Could not connect: ' . mysql_error()); //链接不上返回错误

}

mysql_select_db('XK',$link) or die ('Can\'t use foo : ' . mysql_error()); //链接数据库中其中的一个库‘XK’，连接不上报错。

$sql = mysql_query(”select name,xuehao from girltable where sex=‘girl’ “); //发送一条 MySQL 查询

$result = 'table'; //将查询结果做成表格

while($row=mysql_fetch_assoc($result)){ //从结果中取得一行作为关联数组

$result .= 'tr';

$result .= 'td'$row['name']'/td';

$result .= 'td'$row['xuehao']'/td';

$result .= '/tr';

}

$result .= '/table';

echo $result; //打印表格

大神！！新手求教：php多条件查询MYsql怎么写啊

$sql="select * from table where (sex="'".$_POST['sex']."'") and (aihao="'".$_POST['aihao']."'") and (dizhi="'".$_POST['dizhi']."') order by addtime desc"

php mysql 事务怎么写

建一张test表

set autocommit=0；//设置mysql不自动提交就是不自动执行sql语句

begin; //开启一个事务

insert into test value(test);

insert into test value(test2);

commit;//提交，会执行上面2句sql语句此时test 表里面有 test 和 test2 2条数据

begin; //开启一个事务

insert into test values(test3);

rollback; //回滚， test表里面并没有test3 这条数据

通常在php里面会判断 if(!mysql_query($sql)){mysql_query('rollback');} 就是如果没有成功执行sql就进行回滚，比如转账我给你10块钱先从我账号里面减去10元再从你账户加10元这就是2条sql 要保证都能执行完成

php中写mysql语句

不管怎样，在这里我总结了常用的PHP连接MySQL数据库以及读取写入数据库的方法，希望能够帮到你，当然也是作为我自己的一个回顾总结。

1.为了更好地设置数据连接,一般会将数据连接所涉及的值定义成变量.

$mysql_server_name='localhost'; //改成自己的mysql数据库服务器

$mysql_username='root'; //改成自己的mysql数据库用户名

$mysql_password='123456'; //改成自己的mysql数据库密码

$mysql_database='Mydb'; //改成自己的mysql数据库名

也可把以上变量放在一个文件里,可以随时让其他文件调用.

例如: 将以上内容放在:db_config.php 那么在其他需要用到数据库的页面直接调用.

调用代码:require("db_config.php");

2.连接数据库

$conn=mysql_connect($mysql_server_name,$mysql_username,$mysql_password) or die("error connecting") ; //连接数据库

mysql_query("set names 'utf8'"); //数据库输出编码应该与你的数据库编码保持一致.南昌网站建设公司百恒网络PHP工程师建议用UTF-8 国际标准编码.

mysql_select_db($mysql_database); //打开数据库

$sql ="select * from news "; //SQL语句

$result = mysql_query($sql,$conn); //查询

3.读取表中的内容,这里我们用while,可以根据具体情况,用for 或其他的.

while($row = mysql_fetch_array($result))

{

echo "div style=\"height:24px; line-height:24px; font-weight:bold;\""; //排版代码

echo $row['Topic'] . "br/";

echo "/div"; //排版代码

}

4.php写入数据库,Mysql数据的写入

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php用mysql怎么写,phpmysql是什么

PHP操作MySQL，删除一行数据库，怎么写？

php表单写入mysql数据库的代码

用php将mysql的表查询出来，该怎么写，用来考二级mysql的

大神！！新手求教：php多条件查询MYsql怎么写啊

php mysql 事务怎么写

php中写mysql语句

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