search
HomeBackend DevelopmentPHP TutorialData Abstraction Layer-ADODB Getting Started Basics_PHP Tutorial

Data Abstraction Layer-ADODB Getting Started Basics_PHP Tutorial

Jul 13, 2016 pm 05:35 PM
Whatgetting StartedpublishBaseBundleabstractdataarticleOwn

以前总是在水区混啊!没有发表什么文章!这次把自己以前写得文章给大家晒晒!呵呵老鸟不要看了!
ADODB 是 Active Data Objects Data Base 的简称,它是一种PHP存取数据库的中间函式组件。
使用 ADODB 最大的优点之一是:不管后端数据库如何,存取数据库的方式都是一致的,开发设计人员不必为了某一套数据库,而必须再学习另一套不同的存取方法,这大大减轻开发人员的知识负担,过去的知识往后仍可继续使用,转移数据库平台时,程序代码也不必做太大的更动。
这些是以前学习总结的一些例子!
复制PHP内容到剪贴板
PHP代码:
include_once("libs/adodb/adodb.inc.php"); //包含adodb的文件

$db = NewADOConnection("mysql"); //建立哪个数据库的对象

$db->Connect("localhost", "root", "root", "mysql") or die("Unable to connect!"); //链接数据库

$ADODB_FETCH_MODE = ADODB_FETCH_ASSOC; //给全局变量赋值,表示下面可以弄关联数组(我的语言不怎么样)

$query = "SELECT * FROM user";
$result = $db->Execute($query) or die("Error in query: $query. " . $db->ErrorMsg());//(Execute执行SQL)

while (!$result->EOF) {
    echo $result->fields[use] . " - " . $result->fields[pass] . " ";
      $result->MoveNext();//movenext()数组向下移。
}//fields表示字段数组

echo " [" . $result->RecordCount() . " 行记录被返回] ";

$db->Close();//关闭链接
?>


这个例子是ADODB最简单的数据库操作!或者大家可以写个类来操作啊!
在adodb中提供3个函数,GetAll,GetOne,GetRow.
GetAll其实相当于execute,但是返回是2维数组。可以和SMARTY很好的操作。
GetOne,GetRow.是判读数据库的某个数据是否存在!
在ADODB中提供了SelectLimit这个函数!
因为在转移数据库的时候可能有些SQL语句不支持!ADODB用selectlimit来在底层帮我们实现!
例如:
$query = "SELECT * FROM library";
$result = $db->SelectLimit($query, 5, 3);
还有一点是ADODB有缓存机制。
提供了CacheExecute这个。呵呵看下例子吧!
PHP代码:
include("../libs/adodb/adodb.inc.php");

//设置缓存保存的路径,.表示当前目录
$ADODB_CACHE_DIR = tmp;
// 创建一个mysql连接实例对象
$db = NewADOConnection("mysql");

// 打开一个数据库连接
$db->Connect("localhost", "root", "root", "adodb") or die("不能连接");

// 构造并执行一个查询
$query = "SELECT * FROM user";
$result = $db->CacheExecute(300,$query) or die("SQL错误: $query. " . $db->ErrorMsg());//CacheExecute(300,$query)这个方法是300,表示缓存存在的时间。

// 遍历返回的记录集,显示列数据的内容 TITLE 和 AUTHOR
while (!$result->EOF) {
    echo $result->fields[1] . " - " . $result->fields[2] . " ";
      $result->MoveNext();
}

// 取得和显示返回的记录行数
echo " [" . $result->RecordCount() . " 行记录被返回] ";

// 关闭数据库连接
$db->Close();
?>


我感觉最爽的还是有转换方法! rs2html();
PHP代码:



include_once(../libs/adodb/adodb.inc.php);


include_once("../libs/adodb/tohtml.inc.php");

// 创建一个mysql连接实例对象
$db = NewADOConnection("mysql");

// 打开一个数据库连接
$db->Connect("localhost", "root", "root", "user") or die("数据库连接错误");

// 构造并执行一个查询
$query = "SELECT * FROM library";
$result = $db->Execute($query) or die("SQL错误: $query. " . $db->ErrorMsg());

// 返回一个HTML格式的表格
echo rs2html($result);//返回数据在表格里面自己看看吧!

// 关闭数据库连接
$db->Close();
?>

下面介绍几个常用的方法吧!
RecordCount()     取得和显示返回的记录行数
FieldCount()      取得和显示返回的字段个数
Insert_ID()       显示最好插入的ID
Affected_Rows()   显示执行完SQL后的被影响的行数
GetMenu()         生成下拉菜单!
好了只总结这么多啊!其实还有很多知识!
还有很多不足!希望老鸟不要笑话啊!
下次再给大家做补充吧!

www.bkjia.comtruehttp: //www.bkjia.com/PHPjc/508317.htmlTechArticleI used to always hang out in the water area! No articles published! This time I will share with you the articles I have written before! Haha, old bird, stop reading! ADODB is a shorthand for Active Data Objects Data Base...
Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
How does PHP type hinting work, including scalar types, return types, union types, and nullable types?How does PHP type hinting work, including scalar types, return types, union types, and nullable types?Apr 17, 2025 am 12:25 AM

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values ​​and handle functions that may return null values.

How does PHP handle object cloning (clone keyword) and the __clone magic method?How does PHP handle object cloning (clone keyword) and the __clone magic method?Apr 17, 2025 am 12:24 AM

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP vs. Python: Use Cases and ApplicationsPHP vs. Python: Use Cases and ApplicationsApr 17, 2025 am 12:23 AM

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.

Describe different HTTP caching headers (e.g., Cache-Control, ETag, Last-Modified).Describe different HTTP caching headers (e.g., Cache-Control, ETag, Last-Modified).Apr 17, 2025 am 12:22 AM

Key players in HTTP cache headers include Cache-Control, ETag, and Last-Modified. 1.Cache-Control is used to control caching policies. Example: Cache-Control:max-age=3600,public. 2. ETag verifies resource changes through unique identifiers, example: ETag: "686897696a7c876b7e". 3.Last-Modified indicates the resource's last modification time, example: Last-Modified:Wed,21Oct201507:28:00GMT.

Explain secure password hashing in PHP (e.g., password_hash, password_verify). Why not use MD5 or SHA1?Explain secure password hashing in PHP (e.g., password_hash, password_verify). Why not use MD5 or SHA1?Apr 17, 2025 am 12:06 AM

In PHP, password_hash and password_verify functions should be used to implement secure password hashing, and MD5 or SHA1 should not be used. 1) password_hash generates a hash containing salt values ​​to enhance security. 2) Password_verify verify password and ensure security by comparing hash values. 3) MD5 and SHA1 are vulnerable and lack salt values, and are not suitable for modern password security.

PHP: An Introduction to the Server-Side Scripting LanguagePHP: An Introduction to the Server-Side Scripting LanguageApr 16, 2025 am 12:18 AM

PHP is a server-side scripting language used for dynamic web development and server-side applications. 1.PHP is an interpreted language that does not require compilation and is suitable for rapid development. 2. PHP code is embedded in HTML, making it easy to develop web pages. 3. PHP processes server-side logic, generates HTML output, and supports user interaction and data processing. 4. PHP can interact with the database, process form submission, and execute server-side tasks.

PHP and the Web: Exploring its Long-Term ImpactPHP and the Web: Exploring its Long-Term ImpactApr 16, 2025 am 12:17 AM

PHP has shaped the network over the past few decades and will continue to play an important role in web development. 1) PHP originated in 1994 and has become the first choice for developers due to its ease of use and seamless integration with MySQL. 2) Its core functions include generating dynamic content and integrating with the database, allowing the website to be updated in real time and displayed in personalized manner. 3) The wide application and ecosystem of PHP have driven its long-term impact, but it also faces version updates and security challenges. 4) Performance improvements in recent years, such as the release of PHP7, enable it to compete with modern languages. 5) In the future, PHP needs to deal with new challenges such as containerization and microservices, but its flexibility and active community make it adaptable.

Why Use PHP? Advantages and Benefits ExplainedWhy Use PHP? Advantages and Benefits ExplainedApr 16, 2025 am 12:16 AM

The core benefits of PHP include ease of learning, strong web development support, rich libraries and frameworks, high performance and scalability, cross-platform compatibility, and cost-effectiveness. 1) Easy to learn and use, suitable for beginners; 2) Good integration with web servers and supports multiple databases; 3) Have powerful frameworks such as Laravel; 4) High performance can be achieved through optimization; 5) Support multiple operating systems; 6) Open source to reduce development costs.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
1 months agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
1 months agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
1 months agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Chat Commands and How to Use Them
1 months agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function

WebStorm Mac version

WebStorm Mac version

Useful JavaScript development tools

Safe Exam Browser

Safe Exam Browser

Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

SublimeText3 English version

SublimeText3 English version

Recommended: Win version, supports code prompts!

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment