Class ForeignKey
	
	
Class for representing a foreign key constraint in SQL
	 
	
		- 
			Alchemy\core\Element
			
			 implements 
				Alchemy\core\IElement
			
			
		
 
		- 
			
			Alchemy\core\schema\TableElement
			
			
			
		 
		- 
			
			Alchemy\core\schema\Index
			
			
			
		 
		- 
			
Alchemy\core\schema\ForeignKey			
			
			
		 
	
	
	
	Methods summary
	
		
			 public 
			Alchemy\core\schema\Table
			
			
		 | 
		
		#
		getSourceTable( )
		
			
Get the table the key references 
		 
		
			
Get the table the key references 
				Returns
				
		 
		  | 
	
	
		
			 public 
			array
			
			
		 | 
		
		#
		listSources( )
		
			
Get the columns the key references 
		 
		
			
Get the columns the key references 
				Returns
				
					array 
				 
		 
		  | 
	
	
		
			 public 
			
			
			
		 | 
		 | 
	
	
		
			 protected 
			
			
			
		 | 
		 | 
	
	
	
	
	
	Methods inherited from Alchemy\core\Element
	
		
			__callStatic(), 
			__clone(), 
			addTag(), 
			addTags(), 
			define(), 
			define_alias(), 
			getDescription(), 
			getID(), 
			getTag(), 
			getType(), 
			get_definition(), 
			listTags(), 
			normalize_arg()
		 | 
	
	
	
	Properties summary
	
		
			protected static 
			array
		 | 
		
				$default_args
		 | 
		array(
    array(), array(),
    'ondelete' => 'restrict',
    'onupdate' => 'restrict') | 
		 | 
	
	
		
			protected  
			mixed
		 | 
		
				$sources
		 | 
		 | 
		 |