php实现数据库操作 php操作mysql数据库

php实现数据库处理

?php

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$title = $_POST['title'];

$name = $_POST['author'];

$message = $_POST['my_message'];

$dbhost = '127.0.0.1';

$dbuser = 'root'; //我的用户名

$dbpass = ''; //我的密码

$dbname = 'exer'; //我的mysql库名

$connect = mysql_connect($dbhost,$dbuser,$dbpass,$dbname);

mysql_query("set names 'utf8" );

mysql_query("INSERT INTO message VALUES (null,'".$title."','".$name."','".$message."',null)")or die("query error");

echo "留言成功";

echo "script type='text/javascript' alert('留言成功')";

echo "window.location='allmessage.php';/script";

?

这是正确的 ,你的"" '' 什么的很乱 ,你自己试着调调

php怎么操作数据库

//链接数据库

$db=mysql_connect("localhost", "root","123456");

$sqlname="database";

mysql_select_db($sqlname,$db);

session_start();

mysql_query("SET NAMES 'utf8'",$db);

?

?

//创建结果集

$sql = "SELECT * FROM kecheng";

$result = mysql_query($sql);

$rs= mysql_fetch_array($result);

?

?

//修改数据

$sql = "UPDATE news SET title='1111' where news_id=1";

$result = mysql_query($sql);

?

?

//删除数据

$sql = "DELETE from news where news_id=1";

$result = mysql_query($sql);

?

?

//添加数据

$sql = "INSERT INTO news (title,fenshu) VALUES ('a',1)"

$result = mysql_query($sql);

?

PHP基于单例模式实现的数据库操作基类

本文实例讲述了PHP基于单例模式实现的数据库操作基类。分享给大家供大家参考,具体如下:

配置文件:

?php

$db

=

array(

'host'='localhost',

'user'='root',

'password'='',

'database'='test',

)

?

php

数据库基类:

?php

class

db

{

public

$conn;

public

static

$sql;

public

static

$instance=null;

private

function

__construct(){

require_once('db.config.php');

$this-conn

=

mysql_connect($db['host'],$db['user'],$db['password']);

if(!mysql_select_db($db['database'],$this-conn)){

echo

"失败";

};

mysql_query('set

names

utf8',$this-conn);

}

public

static

function

getInstance(){

if(is_null(self::$instance)){

self::$instance

=

new

db;

}

return

self::$instance;

}

/**

*

查询数据库

*/

public

function

select($table,$condition=array(),$field

=

array()){

$where='';

if(!empty($condition)){

foreach($condition

as

$k=$v){

$where.=$k."='".$v."'

and

";

}

$where='where

'.$where

.'1=1';

}

$fieldstr

=

'';

if(!empty($field)){

foreach($field

as

$k=$v){

$fieldstr.=

$v.',';

}

$fieldstr

=

rtrim($fieldstr,',');

}else{

$fieldstr

=

'*';

}

self::$sql

=

"select

{$fieldstr}

from

{$table}

{$where}";

$result=mysql_query(self::$sql,$this-conn);

$resuleRow

=

array();

$i

=

0;

while($row=mysql_fetch_assoc($result)){

foreach($row

as

$k=$v){

$resuleRow[$i][$k]

=

$v;

}

$i++;

}

return

$resuleRow;

}

/**

*

添加一条记录

*/

public

function

insert($table,$data){

$values

=

'';

$datas

=

'';

foreach($data

as

$k=$v){

$values.=$k.',';

$datas.="'$v'".',';

}

$values

=

rtrim($values,',');

$datas

=

rtrim($datas,',');

self::$sql

=

"INSERT

INTO

{$table}

({$values})

VALUES

({$datas})";

if(mysql_query(self::$sql)){

return

mysql_insert_id();

}else{

return

false;

};

}

/**

*

修改一条记录

*/

public

function

update($table,$data,$condition=array()){

$where='';

if(!empty($condition)){

foreach($condition

as

$k=$v){

$where.=$k."='".$v."'

and

";

}

$where='where

'.$where

.'1=1';

}

$updatastr

=

'';

if(!empty($data)){

foreach($data

as

$k=$v){

$updatastr.=

$k."='".$v."',";

}

$updatastr

=

'set

'.rtrim($updatastr,',');

}

self::$sql

=

"update

{$table}

{$updatastr}

{$where}";

return

mysql_query(self::$sql);

}

/**

*

删除记录

*/

public

function

delete($table,$condition){

$where='';

if(!empty($condition)){

foreach($condition

as

$k=$v){

$where.=$k."='".$v."'

and

";

}

$where='where

'.$where

.'1=1';

}

self::$sql

=

"delete

from

{$table}

{$where}";

return

mysql_query(self::$sql);

}

public

static

function

getLastSql(){

echo

self::$sql;

}

}

$db

=

db::getInstance();

//$list

=

$db-select('demo',array('name'='tom','password'='ds'),array('name','password'));

//echo

$db-insert('demo',array('name'='脚本之家','password'='123'));

//echo

$db-update('demo',array("name"='xxx',"password"='123'),array('id'=1));

echo

$db-delete('demo',array('id'='2'));

db::getLastSql();

echo

"pre";

?

更多关于PHP操作数据库相关内容感兴趣的读者可查看本站专题:《php+mysql数据库操作入门教程》、《PHP基于pdo操作数据库技巧总结》及《php常见数据库操作技巧汇总》

希望本文所述对大家PHP程序设计有所帮助。

php opencart怎么进行数据库操作

1,根目录下config.php中定义了数据库信息:

// DB

define('DB_DRIVER', 'mysqli');

define('DB_HOSTNAME', 'localhost');

define('DB_USERNAME', 'root');

define('DB_PASSWORD', 'qqqq');

define('DB_DATABASE', 'qqqq');

define('DB_PORT', '3306');

define('DB_PREFIX', 'oc_');

2,systemlibrary文件夹下db.php中定义了DB类,数据库的连接方法

$this-db = new $class($hostname, $username, $password, $database, $port);

3,index.php中初始化数据库连接

$db = new DB(DB_DRIVER, DB_HOSTNAME, DB_USERNAME, DB_PASSWORD, DB_DATABASE, DB_PORT);

4,controller中调用model层定义的查询函数

$layout_id = $this-model_catalog_category-getCategoryLayoutId(end($path));

5,model层getCategoryLayoutId函数中返回查询sql结果

$query = $this-db-query("SELECT * FROM " . DB_PREFIX . "category_to_layout WHERE category_id = '" . (int)$category_id . "' AND store_id = '" . (int)$this-config-get('config_store_id') . "'");

php怎么操作数据库~呢?

PHP链接数据库有几种方式

mysqli:

?php

$servername = "localhost";

$username = "username";

$password = "password";

// 创建连接

$conn = new mysqli($servername, $username, $password);

// 检测连接

if ($conn-connect_error) {

die("连接失败: " . $conn-connect_error);

}

echo "连接成功";

?

也可以使用PDO进行链接,前提是你必须在php.ini中开启PDO:

?php

$servername = "localhost";

$username = "username";

$password = "password";

try {

$conn = new PDO("mysql:host=$servername;dbname=myDB", $username, $password);

echo "连接成功";

}

catch(PDOException $e)

{

echo $e-getMessage();

}

?

建议使用PDO,功能更加强大,兼容各种数据库

关于这个问题,差不多就是这个样子的了,你如果不明白,可以自己去后盾瞅瞅,我这些都是在后盾上学的,有空可以去看一下,就算不喜欢也没关系啊,何乐而不为呢?


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