PHP Class Prado\Data\ActiveRecord\TActiveRecord

An active record creates an object that wraps a row in a database table or view, encapsulates the database access, and adds domain logic on that data. Active record objects are stateful, this is main difference between the TActiveRecord implementation and the TTableGateway implementation. The essence of an Active Record is an object model of the domain (e.g. products, items) that incorporates both behavior and data in which the classes match very closely the record structure of an underlying database. Each Active Record is responsible for saving and loading to the database and also for any domain logic that acts on the data. The Active Record provides methods that do the following: 1. Construct an instance of the Active Record from a SQL result set row. 2. Construct a new instance for later insertion into the table. 3. Finder methods to wrap commonly used SQL queries and return Active Record objects. 4. Update the database and insert into it the data in the Active Record. Example:


class UserRecord extends TActiveRecord
{
    const TABLE='users'; //optional table name.

    public $username; //corresponds to the fieldname in the table
    public $email;
returns active record finder instance
    public static function finder($className=__CLASS__)
    {
        return parent::finder($className);
    }
}
create a connection and give it to the ActiveRecord manager.
$dsn = 'pgsql:host=localhost;dbname=test';
$conn = new TDbConnection($dsn, 'dbuser','dbpass');
TActiveRecordManager::getInstance()->setDbConnection($conn);
load the user record with username (primary key) 'admin'.
$user = UserRecord::finder()->findByPk('admin');
$user->email = '[email protected]';
$user->save(); //update the 'admin' record.

Since v3.1.1, TActiveRecord starts to support column mapping. The physical column names (defined in database) can be mapped to logical column names (defined in active classes as public properties.) To use this feature, declare a static class variable COLUMN_MAPPING like the following:


class UserRecord extends TActiveRecord
{
    const TABLE='users';
    public static $COLUMN_MAPPING=array
    (
        'user_id'=>'username',
        'email_address'=>'email',
    );
    public $username;
    public $email;
}

In the above, the 'users' table consists of 'user_id' and 'email_address' columns, while the UserRecord class declares 'username' and 'email' properties. By using column mapping, we can regularize the naming convention of column names in active record. Since v3.1.2, TActiveRecord enhanced its support to access of foreign objects. By declaring a public static variable RELATIONS like the following, one can access the corresponding foreign objects easily:


class UserRecord extends TActiveRecord
{
    const TABLE='users';
    public static $RELATIONS=array
    (
        'department'=>array(self::BELONGS_TO, 'DepartmentRecord', 'department_id'),
        'contacts'=>array(self::HAS_MANY, 'ContactRecord', 'user_id'),
    );
}

In the above, the users table is related with departments table (represented by DepartmentRecord) and contacts table (represented by ContactRecord). Now, given a UserRecord instance $user, one can access its department and contacts simply by: $user->department and $user->contacts. No explicit data fetching is needed. Internally, the foreign objects are fetched in a lazy way, which avoids unnecessary overhead if the foreign objects are not accessed at all. Since v3.1.2, new events OnInsert, OnUpdate and OnDelete are available. The event OnInsert, OnUpdate and OnDelete methods are executed before inserting, updating, and deleting the current record, respectively. You may override these methods; a TActiveRecordChangeEventParameter parameter is passed to these methods. The property {@link TActiveRecordChangeEventParameter::setIsValid IsValid} of the parameter can be set to false to prevent the change action to be executed. This can be used, for example, to validate the record before the action is executed. For example, in the following the password property is hashed before a new record is inserted.


class UserRecord extends TActiveRecord
{
     function OnInsert($param)
     {
parent method should be called to raise the event
         parent::OnInsert($param);
         $this->nounce = md5(time());
         $this->password = md5($this->password.$this->nounce);
     }
}

Since v3.1.3 you can also define a method that returns the table name.


class UserRecord extends TActiveRecord
{
    public function table()
    {
         return 'users';
    }

}

Since: 3.1

Inheritance: extends Prado\TComponent

显示文件 Open project: pradosoft/prado Class Usage Examples

Public Properties

Property	Type	Description
$COLUMN_MAPPING		The keys are physical column names as defined in database, and the values are logical column names as defined as public variable/property names for the corresponding active record class.
$RELATIONS		The keys are public variable/property names defined in the AR class. Each value is an array, e.g. array(self::HAS_MANY, 'PlayerRecord').

Protected Properties

Property	Type	Description
$_connection		database connection object.
$_invalidFinderResult	TActiveRecordInvalidFinderResult	Defaults to 'null'
$_recordState		record state: 0 = new, 1 = loaded, 2 = deleted.

Public Methods

Method	Description
__call ( $method, $args ) : mixed	Dynamic find method using parts of method name as search criteria.
__construct ( $data = [], $connection = null )	Create a new instance of an active record with given $data. The record can be saved to the database specified by the $connection object.
__get ( $name ) : mixed	Magic method for reading properties.
__set ( $name, $value )	Magic method for writing properties.
__sleep ( )	Prevent __call() method creating __sleep() when serializing.
__wakeup ( )	Prevent __call() method creating __wakeup() when unserializing.
copyFrom ( $data )	Copies data from an array or another object.
count ( $criteria = null, $parameters = [] ) : integer	Find the number of records.
createRecord ( $type, $data ) : TActiveRecord	Create an AR instance specified by the AR class name and initial data.
delete ( ) : boolean	Deletes the current record from the database. Once deleted, this object can not be saved again in the same instance.
deleteAll ( $criteria = null, $parameters = [] ) : integer	Delete multiple records using a criteria.
deleteAllByPks ( $keys )	Alias for deleteByPk()
deleteByPk ( $keys ) : integer	Delete records by primary key. Usage:
equals ( TActiveRecord $record, $strict = false ) : boolean	Compare two records using their primary key values (all column values if table does not defined primary keys). The default uses simple == for comparison of their values. Set $strict=true for identity comparison (===).
find ( $criteria, $parameters = [] ) : TActiveRecord	Find one single record that matches the criteria.
findAll ( $criteria = null, $parameters = [] ) : array	Same as find() but returns an array of objects.
findAllByIndex ( $criteria, $fields, $values ) : array	Fetches records using the sql clause "(fields) IN (values)", where fields is an array of column names and values is an array of values that the columns must have.
findAllByPks ( $keys ) : array	Find multiple records matching a list of primary or composite keys.
findAllBySql ( $sql, array $parameters = [] ) : array	Find records using full SQL, returns corresponding record object.
findByPk ( $keys ) : TActiveRecord.	Find one record using only the primary key or composite primary keys. Usage:
findBySql ( $sql, array $parameters = [] ) : TActiveRecord,	Find records using full SQL, returns corresponding record object.
finder ( $className = __CLASS__ ) : TActiveRecord	Returns the instance of a active record finder for a particular class.
getActiveDbConnection ( )
getColumnValue ( $columnName ) : mixed	Retrieves the column value according to column name.
getDbConnection ( ) : TDbConnection	Gets the current Db connection, the connection object is obtained from the TActiveRecordManager if connection is currently null.
getInvalidFinderResult ( ) : TActiveRecordInvalidFinderResult
getRecordGateway ( ) : TActiveRecordGateway
getRecordManager ( ) : TActiveRecordManager	Gets the record manager for this object, the default is to call TActiveRecordManager::getInstance().
getRecordRelation ( $property ) : array
getRecordRelations ( ) : array
getRecordTableInfo ( ) : TDbTableInfo
hasRecordRelation ( $property ) : boolean
onCreateCommand ( $param )	Raised when a command is prepared and parameter binding is completed.
onDelete ( $param )	Raised before the record attempt to delete its data from the database.
onExecuteCommand ( $param )	Raised when a command is executed and the result from the database was returned.
onInsert ( $param )	Raised before the record attempt to insert its data into the database.
onUpdate ( $param )	Raised before the record attempt to update its data in the database.
save ( ) : boolean	Saves the current record to the database, insert or update is automatically determined.
setColumnValue ( $columnName, $value )	Sets the column value according to column name.
setDbConnection ( $connection )
setInvalidFinderResult ( $value )	Define the way an active record finder react if an invalid magic-finder invoked
toArray ( ) : array	Return record data as array
toJSON ( ) : JSON	Return record data as JSON

Protected Methods

Method	Description
createRelationContext ( $name ) : TActiveRecordRelationContext	Gets a static copy of the relationship context for given property (a key in $RELATIONS), returns null if invalid relationship. Keeps a null reference to all invalid relations called.
fetchResultsFor ( $property ) : boolean	Tries to load the relationship results for the given property. The $property value should correspond to an entry key in the $RELATION array.
getRecordCriteria ( $criteria, $parameters, $args = [] ) : TSqlCriteria	Create a new TSqlCriteria object from a string $criteria. The $args are additional parameters and are used in place of the $parameters if $parameters is not an array and $args is an arrary.
getRelationHandler ( $name, $args = [] ) : TActiveRecordRelation,	Returns the active record relationship handler for $RELATION with key value equal to the $property value.
populateObject ( $data ) : TActiveRecord	Populates a new record with the query result.
populateObjects ( $reader ) : array

Private Methods

Method	Description
setupColumnMapping ( )
setupRelations ( )

Method Details

__call() public method

Method name starting with "findBy" only returns 1 record. Method name starting with "findAllBy" returns 0 or more records. Method name starting with "deleteBy" deletes records by the trail criteria. The condition is taken as part of the method name after "findBy", "findAllBy" or "deleteBy". The following are equivalent:


$finder->findByName($name)
$finder->find('Name = ?', $name);


$finder->findByUsernameAndPassword($name,$pass); // OR may be used
$finder->findBy_Username_And_Password($name,$pass); // _OR_ may be used
$finder->find('Username = ? AND Password = ?', $name, $pass);


$finder->findAllByAge($age);
$finder->findAll('Age = ?', $age);


$finder->deleteAll('Name = ?', $name);
$finder->deleteByName($name);

public __call ( $method, $args ) : mixed
return	mixed	single record if method name starts with "findBy", 0 or more records if method name starts with "findAllBy"

__construct() public method

Create a new instance of an active record with given $data. The record can be saved to the database specified by the $connection object.

public __construct ( $data = [], $connection = null )

__get() public method

This method is overriden to provide read access to the foreign objects via the key names declared in the RELATIONS array.

Since: 3.1.2

public __get ( $name ) : mixed
return	mixed	property value.

__set() public method

This method is overriden to provide write access to the foreign objects via the key names declared in the RELATIONS array.

Since: 3.1.2

public __set ( $name, $value )

__sleep() public method

Prevent __call() method creating __sleep() when serializing.

public __sleep ( )

__wakeup() public method

Prevent __call() method creating __wakeup() when unserializing.

public __wakeup ( )

copyFrom() public method

Copies data from an array or another object.

public copyFrom ( $data )

count() public method

Find the number of records.

public count ( $criteria = null, $parameters = [] ) : integer
return	integer	number of records.

createRecord() public static method

If the initial data is empty, the AR object will not be created and null will be returned. (You should use the "new" operator to create the AR instance in that case.)

Since: 3.1.2

public static createRecord ( $type, $data ) : TActiveRecord
return	TActiveRecord	the initialized AR object. Null if the initial data is empty.

createRelationContext() protected method

Gets a static copy of the relationship context for given property (a key in $RELATIONS), returns null if invalid relationship. Keeps a null reference to all invalid relations called.

Since: 3.1.2

protected createRelationContext ( $name ) : TActiveRecordRelationContext
return	Prado\Data\ActiveRecord\Relations\TActiveRecordRelationContext	object containing information on the active record relationships for given property, null if invalid relationship

delete() public method

Deletes the current record from the database. Once deleted, this object can not be saved again in the same instance.

public delete ( ) : boolean
return	boolean	true if the record was deleted successfully, false otherwise.

deleteAll() public method

Delete multiple records using a criteria.

public deleteAll ( $criteria = null, $parameters = [] ) : integer
return	integer	number of records deleted.

deleteAllByPks() public method

Alias for deleteByPk()

public deleteAllByPks ( $keys )

deleteByPk() public method


$finder->deleteByPk($primaryKey); //delete 1 record
$finder->deleteByPk($key1,$key2,...); //delete multiple records
$finder->deleteByPk(array($key1,$key2,...)); //delete multiple records

For composite primary keys (determined from the table definitions):


$finder->deleteByPk(array($key1,$key2)); //delete 1 record
delete multiple records
$finder->deleteByPk(array($key1,$key2), array($key3,$key4),...);
delete multiple records
$finder->deleteByPk(array( array($key1,$key2), array($key3,$key4), .. ));

public deleteByPk ( $keys ) : integer
return	integer	number of records deleted.

equals() public method

Compare two records using their primary key values (all column values if table does not defined primary keys). The default uses simple == for comparison of their values. Set $strict=true for identity comparison (===).

public equals ( TActiveRecord $record, $strict = false ) : boolean
$record	TActiveRecord
return	boolean	true if $record equals, false otherwise.

fetchResultsFor() protected method

This method can be used to lazy load relationships.


class TeamRecord extends TActiveRecord
{
    ...

    private $_players;
    public static $RELATION=array
    (
        'players' => array(self::HAS_MANY, 'PlayerRecord'),
    );

    public function setPlayers($array)
    {
        $this->_players=$array;
    }

    public function getPlayers()
    {
        if($this->_players===null)
            $this->fetchResultsFor('players');
        return $this->_players;
    }
}
Usage example:
$team = TeamRecord::finder()->findByPk(1);
var_dump($team->players); //uses lazy load to fetch 'players' relation

Since: 3.1.2

protected fetchResultsFor ( $property ) : boolean
return	boolean	true if relationship exists, false otherwise.

find() public method

Usage:


$finder->find('username = :name AND password = :pass',
					array(':name'=>$name, ':pass'=>$pass));
$finder->find('username = ? AND password = ?', array($name, $pass));
$finder->find('username = ? AND password = ?', $name, $pass);
$criteria is of TActiveRecordCriteria
$finder->find($criteria); //the 2nd parameter for find() is ignored.

public find ( $criteria, $parameters = [] ) : TActiveRecord
return	TActiveRecord	matching record object. Null if no result is found.

findAll() public method

Same as find() but returns an array of objects.

public findAll ( $criteria = null, $parameters = [] ) : array
return	array	matching record objects. Empty array if no result is found.

findAllByIndex() public method

This method is to be used by the relationship handler.

public findAllByIndex ( $criteria, $fields, $values ) : array
return	array	matching active records. Empty array is returned if no result is found.

findAllByPks() public method

For scalar primary keys:


$finder->findAllByPk($key1, $key2, ...);
$finder->findAllByPk(array($key1, $key2, ...));

For composite keys:


$finder->findAllByPk(array($key1, $key2), array($key3, $key4), ...);
$finder->findAllByPk(array(array($key1, $key2), array($key3, $key4), ...));

public findAllByPks ( $keys ) : array
return	array	matching ActiveRecords. Empty array is returned if no result is found.

findAllBySql() public method

The names of the column retrieved must be defined in your Active Record class.

public findAllBySql ( $sql, array $parameters = [] ) : array
$parameters	array
return	array	matching active records. Empty array is returned if no result is found.

findByPk() public method


$finder->findByPk($primaryKey);
$finder->findByPk($key1, $key2, ...);
$finder->findByPk(array($key1,$key2,...));

public findByPk ( $keys ) : TActiveRecord.
return	TActiveRecord.

findBySql() public method

The names of the column retrieved must be defined in your Active Record class.

public findBySql ( $sql, array $parameters = [] ) : TActiveRecord,
$parameters	array
return	TActiveRecord,

finder() public static method

The finder objects are static instances for each ActiveRecord class. This means that event handlers bound to these finder instances are class wide. Create a new instance of the ActiveRecord class if you wish to bound the event handlers to object instance.

public static finder ( $className = __CLASS__ ) : TActiveRecord
return	TActiveRecord	active record finder instance.

getActiveDbConnection() public static method

public static getActiveDbConnection ( )

getColumnValue() public method

This method is used internally.

Since: 3.1.1

public getColumnValue ( $columnName ) : mixed
return	mixed	the corresponding column value

getDbConnection() public method

Gets the current Db connection, the connection object is obtained from the TActiveRecordManager if connection is currently null.

public getDbConnection ( ) : TDbConnection
return	TDbConnection	current db connection for this object.

getInvalidFinderResult() public method

See also: TActiveRecordManager::getInvalidFinderResult

Since: 3.1.5

public getInvalidFinderResult ( ) : TActiveRecordInvalidFinderResult
return	TActiveRecordInvalidFinderResult	Defaults to '{@link TActiveRecordInvalidFinderResult::Null Null}'.

getRecordCriteria() protected method

Create a new TSqlCriteria object from a string $criteria. The $args are additional parameters and are used in place of the $parameters if $parameters is not an array and $args is an arrary.

protected getRecordCriteria ( $criteria, $parameters, $args = [] ) : TSqlCriteria
return	Prado\Data\DataGateway\TSqlCriteria	criteria object.

getRecordGateway() public method

public getRecordGateway ( ) : TActiveRecordGateway
return	TActiveRecordGateway	record table gateway.

getRecordManager() public static method

Gets the record manager for this object, the default is to call TActiveRecordManager::getInstance().

public static getRecordManager ( ) : TActiveRecordManager
return	TActiveRecordManager	default active record manager.

getRecordRelation() public method

Since: 3.1.2

public getRecordRelation ( $property ) : array
return	array	relation definition for the specified property

getRecordRelations() public method

Since: 3.1.2

public getRecordRelations ( ) : array
return	array	all relation definitions declared in the AR class

getRecordTableInfo() public method

public getRecordTableInfo ( ) : TDbTableInfo
return	TDbTableInfo	the meta information of the table associated with this AR class.

getRelationHandler() protected method

Returns the active record relationship handler for $RELATION with key value equal to the $property value.

protected getRelationHandler ( $name, $args = [] ) : TActiveRecordRelation,
return	TActiveRecordRelation,

hasRecordRelation() public method

Since: 3.1.2

public hasRecordRelation ( $property ) : boolean
return	boolean	whether a relation is declared for the specified AR property

onCreateCommand() public method

The parameter object is TDataGatewayEventParameter of which the {@link TDataGatewayEventParameter::getCommand Command} property can be inspected to obtain the sql query to be executed. Note well that the finder objects obtained from ActiveRecord::finder() method are static objects. This means that the event handlers are bound to a static finder object and not to each distinct active record object.

public onCreateCommand ( $param )

onDelete() public method

To prevent the delete operation, set the TActiveRecordChangeEventParameter::IsValid parameter to false.

public onDelete ( $param )

onExecuteCommand() public method

The parameter object is TDataGatewayResultEventParameter of which the {@link TDataGatewayEventParameter::getResult Result} property contains the data return from the database. The data returned can be changed by setting the {@link TDataGatewayEventParameter::setResult Result} property. Note well that the finder objects obtained from ActiveRecord::finder() method are static objects. This means that the event handlers are bound to a static finder object and not to each distinct active record object.

public onExecuteCommand ( $param )

onInsert() public method

To prevent the insert operation, set the TActiveRecordChangeEventParameter::IsValid parameter to false.

public onInsert ( $param )

onUpdate() public method

To prevent the update operation, set the TActiveRecordChangeEventParameter::IsValid parameter to false.

public onUpdate ( $param )

populateObject() protected method

This is a wrapper of {@link createRecord}.

protected populateObject ( $data ) : TActiveRecord
return	TActiveRecord	object record, null if data is empty.

populateObjects() protected method

Since: 3.1.2

protected populateObjects ( $reader ) : array
return	array	the AR objects populated by the query result

save() public method

Saves the current record to the database, insert or update is automatically determined.

public save ( ) : boolean
return	boolean	true if record was saved successfully, false otherwise.

setColumnValue() public method

This method is used internally.

Since: 3.1.1

public setColumnValue ( $columnName, $value )

setDbConnection() public method

public setDbConnection ( $connection )

setInvalidFinderResult() public method

Define the way an active record finder react if an invalid magic-finder invoked

See also: TActiveRecordManager::setInvalidFinderResult

Since: 3.1.5

public setInvalidFinderResult ( $value )

toArray() public method

Return record data as array

Since: 3.2.4

public toArray ( ) : array
return	array	of column name and column values

toJSON() public method

Return record data as JSON

Since: 3.2.4

public toJSON ( ) : JSON
return	JSON

Property Details

$COLUMN_MAPPING public_oe static_oe property

The keys are physical column names as defined in database, and the values are logical column names as defined as public variable/property names for the corresponding active record class.

Since: 3.1.1

public static $COLUMN_MAPPING

$RELATIONS public_oe static_oe property

The keys are public variable/property names defined in the AR class. Each value is an array, e.g. array(self::HAS_MANY, 'PlayerRecord').

Since: 3.1.1

public static $RELATIONS

$_connection protected_oe property

database connection object.

protected $_connection

$_invalidFinderResult protected_oe property

Defaults to 'null'

Since: 3.1.5

protected TActiveRecordInvalidFinderResult,Prado\Data\ActiveRecord $_invalidFinderResult
return	TActiveRecordInvalidFinderResult

$_recordState protected_oe property

record state: 0 = new, 1 = loaded, 2 = deleted.

Since: 3.1.2

protected $_recordState