Modules

Kohana_Database_Query

Database query wrapper. See Prepared Statements for usage and examples.

package
Kohana/Database
category
Query
author
Kohana Team
copyright
© 2008-2009 Kohana Team
license
http://kohanaphp.com/license

Class declared in MODPATH/database/classes/kohana/database/query.php on line 11.

Properties

protected $_as_object

protected $_lifetime

protected $_object_params

protected $_parameters

protected $_sql

protected $_type

Methods

public __construct( integer $type , string $sql ) (defined in Kohana_Database_Query)

Creates a new SQL query of the specified type.

Parameters

  • integer $type required - Query type: Database::SELECT, Database::INSERT, etc
  • string $sql required - Query string

Return Values

  • void

Source Code

public function __construct($type, $sql)
{
	$this->_type = $type;
	$this->_sql = $sql;
}

final public __toString( ) (defined in Kohana_Database_Query)

Return the SQL query string.

Return Values

  • string

Source Code

final public function __toString()
{
	try
	{
		// Return the SQL string
		return $this->compile(Database::instance());
	}
	catch (Exception $e)
	{
		return Kohana::exception_text($e);
	}
}

public as_assoc( ) (defined in Kohana_Database_Query)

Returns results as associative arrays

Return Values

  • $this

Source Code

public function as_assoc()
{
	$this->_as_object = FALSE;

	$this->_object_params = array();

	return $this;
}

public as_object( [ string $class = bool TRUE , $params = NULL ] ) (defined in Kohana_Database_Query)

Returns results as objects

Parameters

  • string $class = bool TRUE - Classname or TRUE for stdClass
  • unknown $params = NULL

Return Values

  • $this

Source Code

public function as_object($class = TRUE, array $params = NULL)
{
	$this->_as_object = $class;

	if ($params)
	{
		// Add object parameters
		$this->_object_params = $params;
	}

	return $this;
}

public bind( string $param , mixed & $var ) (defined in Kohana_Database_Query)

Bind a variable to a parameter in the query.

Parameters

  • string $param required - Parameter key to replace
  • byref mixed $var required - Variable to use

Return Values

  • $this

Source Code

public function bind($param, & $var)
{
	// Bind a value to a variable
	$this->_parameters[$param] =& $var;

	return $this;
}

public cached( [ integer $lifetime = NULL ] ) (defined in Kohana_Database_Query)

Enables the query to be cached for a specified amount of time.

Parameters

  • integer $lifetime = NULL - Number of seconds to cache or null for default

Tags

Return Values

  • $this

Source Code

public function cached($lifetime = NULL)
{
	if ($lifetime === NULL)
	{
		// Use the global setting
		$lifetime = Kohana::$cache_life;
	}

	$this->_lifetime = $lifetime;

	return $this;
}

public compile( object $db ) (defined in Kohana_Database_Query)

Compile the SQL query and return it. Replaces any parameters with their given values.

Parameters

  • object $db required - Database instance

Return Values

  • string

Source Code

public function compile(Database $db)
{
	// Import the SQL locally
	$sql = $this->_sql;

	if ( ! empty($this->_parameters))
	{
		// Quote all of the values
		$values = array_map(array($db, 'quote'), $this->_parameters);

		// Replace the values in the SQL
		$sql = strtr($sql, $values);
	}

	return $sql;
}

public execute( [ mixed $db = NULL ] ) (defined in Kohana_Database_Query)

Execute the current query on the given database.

Parameters

  • mixed $db = NULL - Database instance or name of instance

Return Values

  • object - Database_Result for SELECT queries
  • mixed - The insert id for INSERT queries
  • integer - Number of affected rows for all other queries

Source Code

public function execute($db = NULL)
{
	if ( ! is_object($db))
	{
		// Get the database instance
		$db = Database::instance($db);
	}

	// Compile the SQL query
	$sql = $this->compile($db);

	if ( ! empty($this->_lifetime) AND $this->_type === Database::SELECT)
	{
		// Set the cache key based on the database instance name and SQL
		$cache_key = 'Database::query("'.$db.'", "'.$sql.'")';

		if (($result = Kohana::cache($cache_key, NULL, $this->_lifetime)) !== NULL)
		{
			// Return a cached result
			return new Database_Result_Cached($result, $sql, $this->_as_object, $this->_object_params);
		}
	}

	// Execute the query
	$result = $db->query($this->_type, $sql, $this->_as_object, $this->_object_params);

	if (isset($cache_key))
	{
		// Cache the result array
		Kohana::cache($cache_key, $result->as_array(), $this->_lifetime);
	}

	return $result;
}

public param( string $param , mixed $value ) (defined in Kohana_Database_Query)

Set the value of a parameter in the query.

Parameters

  • string $param required - Parameter key to replace
  • mixed $value required - Value to use

Return Values

  • $this

Source Code

public function param($param, $value)
{
	// Add or overload a new parameter
	$this->_parameters[$param] = $value;

	return $this;
}

public parameters( array $params ) (defined in Kohana_Database_Query)

Add multiple parameters to the query.

Parameters

  • array $params required - List of parameters

Return Values

  • $this

Source Code

public function parameters(array $params)
{
	// Merge the new parameters in
	$this->_parameters = $params + $this->_parameters;

	return $this;
}

public type( ) (defined in Kohana_Database_Query)

Get the type of the query.

Return Values

  • integer

Source Code

public function type()
{
	return $this->_type;
}