RapidDB: RapidDB是一个轻量级数据库操作组件支持事务嵌套 PDO支持 JSON支持类的实例集合支持轻量级可以轻易和其他框架整合多数据库多连接支持

# RapidDB 轻量级数据库操作组件

* 支持事务嵌套
* PDO支持
* JSON支持
* 类的实例集合支持
* 轻量级
* 可以轻易和其他框架整合
* 多数据库多连接支持

##使用方式

###通过composer安装
```
$ composer require shiwolang/db
```
###初始化连接
**暂仅支持mysql和sqlite**
#####单个连接情景
```php
DB::init([
    'database_type' => 'mysql',
    'database_name' => 'dbname',
    'server'        => 'localhost',
    'username'      => 'username',
    'password'      => 'yourpass',
    'charset'       => 'utf8'
]);
```
#####多个连接情景
```php
DB::init([
    'database_type' => 'mysql',
    'database_name' => 'dbname',
    'server'        => 'localhost',
    'username'      => 'username',
    'password'      => 'yourpass',
    'charset'       => 'utf8'
], "connection1");
```
#####PDO设置初始化 单个连接情景
```php
DB::init($PDO);
```
#####PDO设置初始化 多个连接情景
```php
DB::init($PDO, "connection1");
```
###获取数据库连接
---------------------------------------
#####单个连接情景
```php
DB::connection();
```
#####多个连接情景
```php
DB::connection("connection1");
```
###添加数据(单表)
---------------------------------------
```php
$lastInsertId = DB::connection()->insert("content", [
    "title"       => "title1",
    "content"     => "content1",
    "time"        =>  time()
]);
```
###删除数据(单表)
---------------------------------------
```php
$lastInsertId = DB::connection()->delete("content", "id = :id", [":id" => 1]);
```
###修改数据(单表)
---------------------------------------
```php
$lastInsertId = DB::connection()->update("content", [
    "title"       => "title1",
    "content"     => "content1",
    "time"        =>  time()
],"id = :id", [":id" => 1]);
```
###查询数据
---------------------------------------
**请注意在使用limit的时候的数值务必为整数int型！！**
```php
DB::connection()->query("SELECT * FROM content where title = 'title1' LIMIT 10")->all();

DB::connection()->query("SELECT * FROM content WHERE title = :title LIMIT :limit", [
    ":title"     => "title1",
    ":limit"     =>  10
])->all();

DB::connection()->query("SELECT * FROM content WHERE id = ? LIMIT ?", ["title1", 10])->all();
```
####设置获取模式
#####设置为数组的获取方式（默认方式）
```php
DB::connection()->query("SELECT * FROM content where title = 'title1' LIMIT 10")->all();
```
#####设置为类的实例集合的获取方式
```php
DB::connection()->query("SELECT * FROM content where title = 'title1' LIMIT 10")->bindToClass(Content::class)->all();
DB::connection()->query("SELECT * FROM content where title = 'title1' LIMIT 10")->all(Content::class);
```
#####将每行的列作为参数传递给指定的函数，并返回调用函数后的结果的获取方式
```php
DB::connection()->query("SELECT * FROM content where title = 'title1' LIMIT 10")->all(function($title, $content, $time){
    return [
        "title"     => $title,
        "content"   => $content,
        "time"      => date("Y-m-d H:i:s", $time)
    ];
});
```
#####按相关的结果集中获取下一行
数组获取方式
```php
DB::connection()->query("SELECT * FROM content LIMIT 10")->each(function ($row) {
    print_r($row);
});
```
类的实例获取方式
```php
DB::connection()->query("SELECT * FROM content LIMIT 10")->each(function ($row) {
    print_r($row);
}, Content::class);
```
#####JSON格式数据
数组获取方式的json
```php
DB::connection()->query("SELECT * FROM content LIMIT 10")->json();
```
类的实例集合获取方式的json

**！！请注意！！  
DB::json(&$fetchResult = null, $className = null, $args = []) 第一个形参为返回的结果集，并不是绑定的类名！！**
```php
DB::connection()->query("SELECT * FROM content LIMIT 10")->json($data, Content::className());
```
**！！注！！**json数据获取中当获取方式为对象集合的方式时，支持数据自动格式化，可以使用@json注解来注解类中的一个公共方法，对应的json键名为这个方法的首字符小写的[去掉get字符后(如果含有)]方法名称；
同样可以实现ObjectContainerInterface和\JsonSerializable 接口并使用Statement::setJsonObjectContainerClassName($jsonObjectContainerClassName)进行对象集合容器的自定义设置

###事务的支持
-----------------------
**此功能依赖数据事务功能**
#####事务使用声明方式
```php
$db = DB::connection();
$db->beginTransaction();
try {
    $lastInsertId = $db->insert("content", [
        "title"       => "title1",
        "content"     => "content1",
        "time"        =>  time()
    ]);
    $db->commit();
} catch (\Exception $e) {
    $db->rollBack();
    throw $e;
}
```
#####事务使用声明方式支持无限级嵌套
```php
$db = DB::connection();
$db->beginTransaction();
try {

try {
        $lastInsertId = $db->insert("content", [
            "title"       => "title1",
            "content"     => "content1",
            "time"        =>  time()
        ]);
        
        $db->commit();
    } catch (\Exception $e) {
        $db->rollBack();
        throw $e;
    }
    
    $lastInsertId = $db->insert("content", [
        "title"       => "title2",
        "content"     => "content2",
        "time"        =>  time()
    ]);
    
    $db->beginTransaction();
    try {
        $lastInsertId = $db->insert("content", [
            "title"       => "title3",
            "content"     => "content3",
            "time"        =>  time()
        ]);
        $db->commit();
    } catch (\Exception $e) {
        $db->rollBack();
        throw $e;
    }
    
    $db->commit();
} catch (\Exception $e) {
    $db->rollBack();
    throw $e;
}
```
#####事务使用回调函数方式，支持无限级嵌套
```php
DB::connection()->transaction(function () {
        DB::connection()->transaction(function () {
                DB::connection()->insert("content", [
                    "title"       => "title1",
                    "content"     => "content1",
                    "time"        =>  time()
                ]);
            }
        });
        
        DB::connection()->insert("content", [
            "title"       => "title2",
            "content"     => "content2",
            "time"        =>  time()
        ]);
        
        DB::connection()->transaction(function () {
                DB::connection()->insert("content", [
                    "title"       => "title3",
                    "content"     => "content3",
                    "time"        =>  time()
                ]);
            }
        });
    }
});
```

###执行记录查询
-----------------------
#####获取所有执行记录
```php
DB::connection()->query("SELECT * FROM content LIMIT 1")->all();
DB::connection()->query("SELECT * FROM content WHERE title = :title LIMIT :limit", [
    ":title" => "title1",
    ":limit" => 10
])->all();;
print_r(DB::connection()->getLog());
```
#####单条未执行的sql
```php
$sql = DB::connection()->query("SELECT * FROM content WHERE title = :title LIMIT :limit", [
    ":title" => "title1",
    ":limit" => 10
], true);
```
##附录
#####Content类
```php
class Content
{
    private $id;
    private $title;
    private $content;

/**
     * @return mixed
     */
    public function getId()
    {
        return $this->id;
    }

/**
     * @param mixed $id
     */
    public function setId($id)
    {
        $this->id = $id;
    }

/**
     * @return mixed
     */
    public function getTitle()
    {
        return $this->title;
    }

/**
     * @param mixed $title
     */
    public function setTitle($title)
    {
        $this->title = $title;
    }

/**
     * For json formater
     * @json
     * @return mixed
     */
    public function getContent()
    {
        return $this->content . "_nihao";
    }

/**
     * @param mixed $content
     */
    public function setContent($content)
    {
        $this->content = $content;
    }
    
    public function __get($name)
    {
        $getter = 'get' . self::camelName($name);

if (method_exists($this, $getter)) {
            return $this->$getter();
        }

throw new \Exception('Getting unknown property: ' . get_class($this) . '::' . $name);
    }
    public function __set($name, $value)
    {
        $setter = 'set' . self::camelName($name);
        if (method_exists($this, $setter)) {
            $this->$setter($value);

return;
        }

throw new \Exception('Setting unknown property: ' . get_class($this) . '::' . $name);
    }
    protected static function camelName($name, $ucfirst = true)
    {
        if (strpos($name, "_") !== false) {
            $name = str_replace("_", " ", strtolower($name));
            $name = ucwords($name);
            $name = str_replace(" ", "", $name);
        }

return $ucfirst ? ucfirst($name) : $name;
    }
}
```
#####数据库创建语句
```sql
CREATE TABLE `content` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `title` varchar(255) DEFAULT NULL,
  `content` varchar(255) DEFAULT NULL,
  `time` int(10) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8
```

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