“数据库层”

🗄️ 数据库层

2.5.x ✅ 4.0.x ✅

了解XOOPS数据库抽象、对象持久性和查询构建。

:::提示[未来-Proof您的数据访问] handler/Criteria 模式适用于两个版本。为了准备 XOOPS 4.0，请考虑将处理程序包装在 Repository classes 中以获得更好的可测试性。参见Choosing a Data Access Pattern。 :::

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概述

XOOPS数据库层提供了对MySQL/MariaDB的强大抽象，具有：

• 工厂模式 - 集中数据库连接管理
• 对象-Relational映射 - XOOPSObject 和处理程序
• 查询构建 - 复杂查询的标准系统
• 连接重用 - 通过单例工厂的单个连接（不是池化）

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🏗️ 架构

flowchart TB
    subgraph App["📱 Application Code"]
        AppCode["Your Module Code"]
    end

    subgraph Handler["🔧 XoopsPersistableObjectHandler"]
        HandlerMethods["create() | get() | insert() | delete()<br/>getObjects() | getCount() | deleteAll()"]
    end

    subgraph Object["📦 XoopsObject"]
        ObjectMethods["initVar() | getVar() | setVar() | toArray()"]
    end

    subgraph Criteria["🔍 Criteria System"]
        CriteriaMethods["Criteria | CriteriaCompo | CriteriaElement"]
    end

    subgraph Database["🗄️ XoopsDatabase"]
        DatabaseMethods["query() | queryF() | fetchArray() | insert()"]
    end

    subgraph Storage["💾 MySQL / MariaDB"]
        DB[(Database)]
    end

    App --> Handler
    Handler --> Object
    Object --> Criteria
    Criteria --> Database
    Database --> Storage

    style App fill:#e3f2fd,stroke:#1976d2
    style Handler fill:#e8f5e9,stroke:#388e3c
    style Object fill:#fff3e0,stroke:#f57c00
    style Criteria fill:#f3e5f5,stroke:#7b1fa2
    style Database fill:#fce4ec,stroke:#c2185b
    style Storage fill:#eceff1,stroke:#546e7a

---

🔌 数据库连接

获取连接

// Recommended: Use the global database instance
$db = \XoopsDatabaseFactory::getDatabaseConnection();

// Legacy: Global variable (still works)
global $xoopsDB;

XOOPSDatabaseFactory

工厂模式确保重复使用单个数据库连接：

<?php

class XoopsDatabaseFactory
{
    private static ?XoopsDatabase $instance = null;

    public static function getDatabaseConnection(): XoopsDatabase
    {
        if (self::$instance === null) {
            self::$instance = new XoopsMySQLDatabase();
        }
        return self::$instance;
    }
}

---

📦 XOOPSObject

XOOPS中所有数据对象的基类。

定义一个对象

<?php

namespace XoopsModules\MyModule;

class Article extends \XoopsObject
{
    public function __construct()
    {
        $this->initVar('article_id', \XOBJ_DTYPE_INT, null, false);
        $this->initVar('category_id', \XOBJ_DTYPE_INT, 0, true);
        $this->initVar('title', \XOBJ_DTYPE_TXTBOX, '', true, 255);
        $this->initVar('content', \XOBJ_DTYPE_TXTAREA, '', false);
        $this->initVar('author_id', \XOBJ_DTYPE_INT, 0, true);
        $this->initVar('status', \XOBJ_DTYPE_TXTBOX, 'draft', true, 20);
        $this->initVar('views', \XOBJ_DTYPE_INT, 0, false);
        $this->initVar('created', \XOBJ_DTYPE_INT, time(), false);
        $this->initVar('updated', \XOBJ_DTYPE_INT, 0, false);
    }
}

数据类型

恒定	类型	描述
XOBJ_DTYPE_INT	整数	数值
XOBJ_DTYPE_TXTBOX	字符串	短文本（< 255 个字符）
XOBJ_DTYPE_TXTAREA	文字	长文本内容
XOBJ_DTYPE_EMAIL	电子邮件	电子邮件地址
XOBJ_DTYPE_URL	URL	网址
XOBJ_DTYPE_FLOAT	浮动	小数
XOBJ_DTYPE_ARRAY	数组	序列化数组
XOBJ_DTYPE_OTHER	混合	原始数据

使用对象

// Create new object
$article = new Article();

// Set values
$article->setVar('title', 'My Article');
$article->setVar('content', 'Article content here...');
$article->setVar('category_id', 5);
$article->setVar('author_id', $xoopsUser->getVar('uid'));

// Get values
$title = $article->getVar('title');           // Raw value
$titleDisplay = $article->getVar('title', 'e'); // For editing (HTML entities)
$titleShow = $article->getVar('title', 's');    // For display (sanitized)

// Bulk assign from array
$article->assignVars([
    'title' => 'New Title',
    'status' => 'published'
]);

// Convert to array
$data = $article->toArray();

---

🔧 对象处理程序

XOOPSPersistableObjectHandler

处理程序类管理 XOOPSObject 实例的CRUD操作。

<?php

namespace XoopsModules\MyModule;

class ArticleHandler extends \XoopsPersistableObjectHandler
{
    public function __construct(\XoopsDatabase $db = null)
    {
        parent::__construct(
            $db,
            'mymodule_articles',  // Table name
            Article::class,       // Object class
            'article_id',         // Primary key
            'title'               // Identifier field
        );
    }
}

处理程序方法

// Get handler instance
$articleHandler = xoops_getModuleHandler('article', 'mymodule');

// Create new object
$article = $articleHandler->create();

// Get by ID
$article = $articleHandler->get(123);

// Insert (create or update)
$success = $articleHandler->insert($article);

// Delete
$success = $articleHandler->delete($article);

// Get multiple objects
$articles = $articleHandler->getObjects($criteria);

// Get count
$count = $articleHandler->getCount($criteria);

// Get as array (key => value)
$list = $articleHandler->getList($criteria);

// Delete multiple
$deleted = $articleHandler->deleteAll($criteria);

自定义处理程序方法

<?php

namespace XoopsModules\MyModule;

class ArticleHandler extends \XoopsPersistableObjectHandler
{
    // ... constructor

    /**
     * Get published articles
     */
    public function getPublished(int $limit = 10, int $start = 0): array
    {
        $criteria = new \CriteriaCompo();
        $criteria->add(new \Criteria('status', 'published'));
        $criteria->setSort('created');
        $criteria->setOrder('DESC');
        $criteria->setLimit($limit);
        $criteria->setStart($start);

        return $this->getObjects($criteria);
    }

    /**
     * Get articles by category
     */
    public function getByCategory(int $categoryId, int $limit = 10): array
    {
        $criteria = new \CriteriaCompo();
        $criteria->add(new \Criteria('category_id', $categoryId));
        $criteria->add(new \Criteria('status', 'published'));
        $criteria->setSort('created');
        $criteria->setOrder('DESC');
        $criteria->setLimit($limit);

        return $this->getObjects($criteria);
    }

    /**
     * Get articles by author
     */
    public function getByAuthor(int $authorId): array
    {
        $criteria = new \Criteria('author_id', $authorId);
        return $this->getObjects($criteria);
    }

    /**
     * Increment view count
     */
    public function incrementViews(int $articleId): bool
    {
        $sql = sprintf(
            'UPDATE %s SET views = views + 1 WHERE article_id = %d',
            $this->table,
            $articleId
        );
        return $this->db->queryF($sql) !== false;
    }

    /**
     * Get popular articles
     */
    public function getPopular(int $limit = 5): array
    {
        $criteria = new \CriteriaCompo();
        $criteria->add(new \Criteria('status', 'published'));
        $criteria->setSort('views');
        $criteria->setOrder('DESC');
        $criteria->setLimit($limit);

        return $this->getObjects($criteria);
    }
}

---

🔍 标准系统

Criteria 系统提供了一种强大的对象-oriented 方式来构建SQL WHERE 条款。

基本标准

// Simple equality
$criteria = new \Criteria('status', 'published');

// With operator
$criteria = new \Criteria('views', 100, '>=');

// Column comparison
$criteria = new \Criteria('updated', 'created', '>');

CriteriaCompo（组合标准）

$criteria = new \CriteriaCompo();

// AND conditions (default)
$criteria->add(new \Criteria('status', 'published'));
$criteria->add(new \Criteria('category_id', 5));

// OR conditions
$criteria->add(new \Criteria('featured', 1), 'OR');

// Nested conditions
$subCriteria = new \CriteriaCompo();
$subCriteria->add(new \Criteria('author_id', 1));
$subCriteria->add(new \Criteria('author_id', 2), 'OR');
$criteria->add($subCriteria);

排序和分页

$criteria = new \CriteriaCompo();
$criteria->add(new \Criteria('status', 'published'));

// Sorting
$criteria->setSort('created');
$criteria->setOrder('DESC');

// Multiple sort fields
$criteria->setSort('category_id, created');
$criteria->setOrder('ASC, DESC');

// Pagination
$criteria->setLimit(10);    // Items per page
$criteria->setStart(20);    // Offset

// Group by
$criteria->setGroupby('category_id');

运算符

操作员	示例	SQL输出
=	new Criteria('status', 'published')	status = 'published'
!=	new Criteria('status', 'draft', '!=')	status != 'draft'
>	new Criteria('views', 100, '>')	views > 100
>=	new Criteria('views', 100, '>=')	views >= 100
<	new Criteria('views', 100, '<')	views < 100
<=	new Criteria('views', 100, '<=')	views <= 100
LIKE	new Criteria('title', '%php%', 'LIKE')	title LIKE '%php%'
NOT LIKE	new Criteria('title', '%test%', 'NOT LIKE')	title NOT LIKE '%test%'
IN	new Criteria('id', '(1,2,3)', 'IN')	id IN (1,2,3)
NOT IN	new Criteria('id', '(1,2,3)', 'NOT IN')	id NOT IN (1,2,3)

复杂示例

// Find published articles in specific categories,
// with search term in title, sorted by views
$criteria = new \CriteriaCompo();

// Status must be published
$criteria->add(new \Criteria('status', 'published'));

// In categories 1, 2, or 3
$criteria->add(new \Criteria('category_id', '(1, 2, 3)', 'IN'));

// Title contains search term
$searchTerm = '%' . $db->escape($searchQuery) . '%';
$criteria->add(new \Criteria('title', $searchTerm, 'LIKE'));

// Created in last 30 days
$thirtyDaysAgo = time() - (30 * 24 * 60 * 60);
$criteria->add(new \Criteria('created', $thirtyDaysAgo, '>='));

// Sort by views descending
$criteria->setSort('views');
$criteria->setOrder('DESC');

// Paginate
$criteria->setLimit(10);
$criteria->setStart($page * 10);

$articles = $articleHandler->getObjects($criteria);
$totalCount = $articleHandler->getCount($criteria);

---

📝 直接查询

对于 Criteria 无法实现的复杂查询，请直接使用 SQL。

安全查询（读）

$db = \XoopsDatabaseFactory::getDatabaseConnection();

$sql = sprintf(
    'SELECT a.*, c.category_name
     FROM %s a
     LEFT JOIN %s c ON a.category_id = c.category_id
     WHERE a.status = %s
     ORDER BY a.created DESC
     LIMIT %d',
    $db->prefix('mymodule_articles'),
    $db->prefix('mymodule_categories'),
    $db->quoteString('published'),
    10
);

$result = $db->query($sql);

while ($row = $db->fetchArray($result)) {
    // Process row
    echo $row['title'];
}

编写查询

// Insert
$sql = sprintf(
    "INSERT INTO %s (title, content, created) VALUES (%s, %s, %d)",
    $db->prefix('mymodule_articles'),
    $db->quoteString($title),
    $db->quoteString($content),
    time()
);
$db->queryF($sql);
$newId = $db->getInsertId();

// Update
$sql = sprintf(
    "UPDATE %s SET views = views + 1 WHERE article_id = %d",
    $db->prefix('mymodule_articles'),
    $articleId
);
$db->queryF($sql);
$affectedRows = $db->getAffectedRows();

// Delete
$sql = sprintf(
    "DELETE FROM %s WHERE article_id = %d",
    $db->prefix('mymodule_articles'),
    $articleId
);
$db->queryF($sql);

转义值

// String escaping
$safeString = $db->quoteString($userInput);
// or
$safeString = $db->escape($userInput);

// Integer (no escaping needed, just cast)
$safeInt = (int) $userInput;

---

⚠️ 安全最佳实践

始终转义用户输入

// NEVER do this
$sql = "SELECT * FROM articles WHERE title = '$_GET[title]'"; // SQL Injection!

// DO this
$title = $db->escape($_GET['title']);
$sql = "SELECT * FROM articles WHERE title = '$title'";

// Or better, use Criteria
$criteria = new \Criteria('title', $db->escape($_GET['title']));

使用参数化查询 (XMF)

use Xmf\Database\TableLoad;

// Safe bulk insert
$tableLoad = new TableLoad('mymodule_articles');
$tableLoad->insert([
    ['title' => 'Article 1', 'content' => 'Content 1'],
    ['title' => 'Article 2', 'content' => 'Content 2'],
]);

验证输入类型

use Xmf\Request;

$id = Request::getInt('id', 0, 'GET');
$title = Request::getString('title', '', 'POST');

---

📊 数据库架构示例

-- sql/mysql.sql

CREATE TABLE `{PREFIX}_mymodule_articles` (
    `article_id` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
    `category_id` INT(11) UNSIGNED NOT NULL DEFAULT 0,
    `title` VARCHAR(255) NOT NULL DEFAULT '',
    `content` TEXT,
    `author_id` INT(11) UNSIGNED NOT NULL DEFAULT 0,
    `status` VARCHAR(20) NOT NULL DEFAULT 'draft',
    `views` INT(11) UNSIGNED NOT NULL DEFAULT 0,
    `created` INT(11) UNSIGNED NOT NULL DEFAULT 0,
    `updated` INT(11) UNSIGNED NOT NULL DEFAULT 0,
    PRIMARY KEY (`article_id`),
    KEY `category_id` (`category_id`),
    KEY `author_id` (`author_id`),
    KEY `status` (`status`),
    KEY `created` (`created`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

---

🔗 相关文档

• Criteria System Deep Dive
• Design Patterns - Factory
• SQL Injection Prevention
• XOOPSDatabase API Reference

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#XOOPS #database #orm #criteria #handlers #mysql