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<?php
/**
* TTableGateway class file.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2014 PradoSoft
* @license http://www.pradosoft.com/license/
* @version $Id$
* @package Prado\Data\DataGateway
*/
namespace Prado\Data\DataGateway;
/**
* Loads the data gateway command builder and sql criteria.
*/
Prado::using('System.Data.DataGateway.TSqlCriteria');
Prado::using('System.Data.DataGateway.TDataGatewayCommand');
/**
* TTableGateway class provides several find methods to get data from the database
* and update, insert, and delete methods.
*
* Each method maps the input parameters into a SQL call and executes the SQL
* against a database connection. The TTableGateway is stateless
* (with respect to the data and data objects), as its role is to push data back and forth.
*
* Example usage:
* <code>
* //create a connection
* $dsn = 'pgsql:host=localhost;dbname=test';
* $conn = new TDbConnection($dsn, 'dbuser','dbpass');
*
* //create a table gateway for table/view named 'address'
* $table = new TTableGateway('address', $conn);
*
* //insert a new row, returns last insert id (if applicable)
* $id = $table->insert(array('name'=>'wei', 'phone'=>'111111'));
*
* $record1 = $table->findByPk($id); //find inserted record
*
* //finds all records, returns an iterator
* $records = $table->findAll();
* print_r($records->readAll());
*
* //update the row
* $table->updateByPk($record1, $id);
* </code>
*
* All methods that may return more than one row of data will return an
* TDbDataReader iterator.
*
* The OnCreateCommand event is raised when a command is prepared and parameter
* binding is completed. The parameter object is a TDataGatewayEventParameter of which the
* {@link TDataGatewayEventParameter::getCommand Command} property can be
* inspected to obtain the sql query to be executed.
*
* The OnExecuteCommand event is raised when a command is executed and the result
* from the database was returned. The parameter object is a
* 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.
*
* <code>
* $table->OnCreateCommand[] = 'log_it'; //any valid PHP callback statement
* $table->OnExecuteCommand[] = array($obj, 'method_name'); // calls 'method_name' on $obj
*
* function log_it($sender, $param)
* {
* var_dump($param); //TDataGatewayEventParameter object.
* }
* </code>
*
* @author Wei Zhuo <weizho[at]gmail[dot]com>
* @version $Id$
* @package Prado\Data\DataGateway
* @since 3.1
*/
class TTableGateway extends TComponent
{
private $_command;
private $_connection;
/**
* Creates a new generic table gateway for a given table or view name
* and a database connection.
* @param string|TDbTableInfo table or view name or table information.
* @param TDbConnection database connection.
*/
public function __construct($table,$connection)
{
$this->_connection=$connection;
if(is_string($table))
$this->setTableName($table);
else if($table instanceof TDbTableInfo)
$this->setTableInfo($table);
else
throw new TDbException('dbtablegateway_invalid_table_info');
}
/**
* @param TDbTableInfo table or view information.
*/
protected function setTableInfo($tableInfo)
{
$builder = $tableInfo->createCommandBuilder($this->getDbConnection());
$this->initCommandBuilder($builder);
}
/**
* Sets up the command builder for the given table.
* @param string table or view name.
*/
protected function setTableName($tableName)
{
Prado::using('System.Data.Common.TDbMetaData');
$meta = TDbMetaData::getInstance($this->getDbConnection());
$this->initCommandBuilder($meta->createCommandBuilder($tableName));
}
public function getTableInfo()
{
return $this->getCommand()->getTableInfo();
}
public function getTableName()
{
return $this->getTableInfo()->getTableName();
}
/**
* @param TDbCommandBuilder database specific command builder.
*/
protected function initCommandBuilder($builder)
{
$this->_command = new TDataGatewayCommand($builder);
$this->_command->OnCreateCommand[] = array($this, 'onCreateCommand');
$this->_command->OnExecuteCommand[] = array($this, 'onExecuteCommand');
}
/**
* Raised when a command is prepared and parameter binding is completed.
* The parameter object is TDataGatewayEventParameter of which the
* {@link TDataGatewayEventParameter::getCommand Command} property can be
* inspected to obtain the sql query to be executed.
* @param TDataGatewayCommand originator $sender
* @param TDataGatewayEventParameter
*/
public function onCreateCommand($sender, $param)
{
$this->raiseEvent('OnCreateCommand', $this, $param);
}
/**
* Raised when a command is executed and the result from the database was returned.
* 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.
* @param TDataGatewayCommand originator $sender
* @param TDataGatewayResultEventParameter
*/
public function onExecuteCommand($sender, $param)
{
$this->raiseEvent('OnExecuteCommand', $this, $param);
}
/**
* @return TDataGatewayCommand command builder and executor.
*/
protected function getCommand()
{
return $this->_command;
}
/**
* @return TDbConnection database connection.
*/
public function getDbConnection()
{
return $this->_connection;
}
/**
* Execute arbituary sql command with binding parameters.
* @param string SQL query string.
* @param array binding parameters, positional or named.
* @return array query results.
*/
public function findBySql($sql, $parameters=array())
{
$args = func_num_args() > 1 ? array_slice(func_get_args(),1) : null;
$criteria = $this->getCriteria($sql,$parameters, $args);
return $this->getCommand()->findBySql($criteria);
}
/**
* Execute arbituary sql command with binding parameters.
* @param string SQL query string.
* @param array binding parameters, positional or named.
* @return TDbDataReader query results.
*/
public function findAllBySql($sql, $parameters=array())
{
$args = func_num_args() > 1 ? array_slice(func_get_args(),1) : null;
$criteria = $this->getCriteria($sql,$parameters, $args);
return $this->getCommand()->findAllBySql($criteria);
}
/**
* Find one single record that matches the criteria.
*
* Usage:
* <code>
* $table->find('username = :name AND password = :pass',
* array(':name'=>$name, ':pass'=>$pass));
* $table->find('username = ? AND password = ?', array($name, $pass));
* $table->find('username = ? AND password = ?', $name, $pass);
* //$criteria is of TSqlCriteria
* $table->find($criteria); //the 2nd parameter for find() is ignored.
* </code>
*
* @param string|TSqlCriteria SQL condition or criteria object.
* @param mixed parameter values.
* @return array matching record object.
*/
public function find($criteria, $parameters=array())
{
$args = func_num_args() > 1 ? array_slice(func_get_args(),1) : null;
$criteria = $this->getCriteria($criteria,$parameters, $args);
return $this->getCommand()->find($criteria);
}
/**
* Accepts same parameters as find(), but returns TDbDataReader instead.
* @param string|TSqlCriteria SQL condition or criteria object.
* @param mixed parameter values.
* @return TDbDataReader matching records.
*/
public function findAll($criteria=null, $parameters=array())
{
$args = func_num_args() > 1 ? array_slice(func_get_args(),1) : null;
if($criteria!==null)
$criteria = $this->getCriteria($criteria,$parameters, $args);
return $this->getCommand()->findAll($criteria);
}
/**
* Find one record using only the primary key or composite primary keys. Usage:
*
* <code>
* $table->findByPk($primaryKey);
* $table->findByPk($key1, $key2, ...);
* $table->findByPk(array($key1,$key2,...));
* </code>
*
* @param mixed primary keys
* @return array matching record.
*/
public function findByPk($keys)
{
if(func_num_args() > 1)
$keys = func_get_args();
return $this->getCommand()->findByPk($keys);
}
/**
* Similar to findByPk(), but returns TDbDataReader instead.
*
* For scalar primary keys:
* <code>
* $table->findAllByPk($key1, $key2, ...);
* $table->findAllByPk(array($key1, $key2, ...));
* </code>
*
* For composite keys:
* <code>
* $table->findAllByPk(array($key1, $key2), array($key3, $key4), ...);
* $table->findAllByPk(array(array($key1, $key2), array($key3, $key4), ...));
* </code>
* @param mixed primary keys
* @return TDbDataReader data reader.
*/
public function findAllByPks($keys)
{
if(func_num_args() > 1)
$keys = func_get_args();
return $this->getCommand()->findAllByPk($keys);
}
/**
* Delete records from the table with condition given by $where and
* binding values specified by $parameter argument.
* This method uses additional arguments as $parameters. E.g.
* <code>
* $table->delete('age > ? AND location = ?', $age, $location);
* </code>
* @param string delete condition.
* @param array condition parameters.
* @return integer number of records deleted.
*/
public function deleteAll($criteria, $parameters=array())
{
$args = func_num_args() > 1 ? array_slice(func_get_args(),1) : null;
$criteria = $this->getCriteria($criteria,$parameters, $args);
return $this->getCommand()->delete($criteria);
}
/**
* Delete records by primary key. Usage:
*
* <code>
* $table->deleteByPk($primaryKey); //delete 1 record
* $table->deleteByPk($key1,$key2,...); //delete multiple records
* $table->deleteByPk(array($key1,$key2,...)); //delete multiple records
* </code>
*
* For composite primary keys (determined from the table definitions):
* <code>
* $table->deleteByPk(array($key1,$key2)); //delete 1 record
*
* //delete multiple records
* $table->deleteByPk(array($key1,$key2), array($key3,$key4),...);
*
* //delete multiple records
* $table->deleteByPk(array( array($key1,$key2), array($key3,$key4), .. ));
* </code>
*
* @param mixed primary key values.
* @return int number of records deleted.
*/
public function deleteByPk($keys)
{
if(func_num_args() > 1)
$keys = func_get_args();
return $this->getCommand()->deleteByPk($keys);
}
/**
* Alias for deleteByPk()
*/
public function deleteAllByPks($keys)
{
if(func_num_args() > 1)
$keys = func_get_args();
return $this->deleteByPk($keys);
}
/**
* Find the number of records.
* @param string|TSqlCriteria SQL condition or criteria object.
* @param mixed parameter values.
* @return int number of records.
*/
public function count($criteria=null,$parameters=array())
{
$args = func_num_args() > 1 ? array_slice(func_get_args(),1) : null;
if($criteria!==null)
$criteria = $this->getCriteria($criteria,$parameters, $args);
return $this->getCommand()->count($criteria);
}
/**
* Updates the table with new name-value pair $data. Each array key must
* correspond to a column name in the table. The update condition is
* specified by the $where argument and additional binding values can be
* specified using the $parameter argument.
* This method uses additional arguments as $parameters. E.g.
* <code>
* $gateway->update($data, 'age > ? AND location = ?', $age, $location);
* </code>
* @param array new record data.
* @param string update condition
* @param array additional binding name-value pairs.
* @return integer number of records updated.
*/
public function update($data, $criteria, $parameters=array())
{
$args = func_num_args() > 2 ? array_slice(func_get_args(),2) : null;
$criteria = $this->getCriteria($criteria,$parameters, $args);
return $this->getCommand()->update($data, $criteria);
}
/**
* Inserts a new record into the table. Each array key must
* correspond to a column name in the table unless a null value is permitted.
* @param array new record data.
* @return mixed last insert id if one column contains a serial or sequence,
* otherwise true if command executes successfully and affected 1 or more rows.
*/
public function insert($data)
{
return $this->getCommand()->insert($data);
}
/**
* @return mixed last insert id, null if none is found.
*/
public function getLastInsertId()
{
return $this->getCommand()->getLastInsertId();
}
/**
* 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 $args is an arrary.
* @param string|TSqlCriteria sql criteria
* @param mixed parameters passed by the user.
* @param array additional parameters obtained from function_get_args().
* @return TSqlCriteria criteria object.
*/
protected function getCriteria($criteria, $parameters, $args)
{
if(is_string($criteria))
{
$useArgs = !is_array($parameters) && is_array($args);
return new TSqlCriteria($criteria,$useArgs ? $args : $parameters);
}
else if($criteria instanceof TSqlCriteria)
return $criteria;
else
throw new TDbException('dbtablegateway_invalid_criteria');
}
/**
* Dynamic find method using parts of method name as search criteria.
* 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:
* <code>
* $table->findByName($name)
* $table->find('Name = ?', $name);
* </code>
* <code>
* $table->findByUsernameAndPassword($name,$pass); // OR may be used
* $table->findBy_Username_And_Password($name,$pass); // _OR_ may be used
* $table->find('Username = ? AND Password = ?', $name, $pass);
* </code>
* <code>
* $table->findAllByAge($age);
* $table->findAll('Age = ?', $age);
* </code>
* <code>
* $table->deleteAll('Name = ?', $name);
* $table->deleteByName($name);
* </code>
* @return mixed single record if method name starts with "findBy", 0 or more records
* if method name starts with "findAllBy"
*/
public function __call($method,$args)
{
$delete =false;
if($findOne = substr(strtolower($method),0,6)==='findby')
$condition = $method[6]==='_' ? substr($method,7) : substr($method,6);
else if(substr(strtolower($method),0,9)==='findallby')
$condition = $method[9]==='_' ? substr($method,10) : substr($method,9);
else if($delete = substr(strtolower($method),0,8)==='deleteby')
$condition = $method[8]==='_' ? substr($method,9) : substr($method,8);
else if($delete = substr(strtolower($method),0,11)==='deleteallby')
$condition = $method[11]==='_' ? substr($method,12) : substr($method,11);
else
return null;
$criteria = $this->getCommand()->createCriteriaFromString($method, $condition, $args);
if($delete)
return $this->deleteAll($criteria);
else
return $findOne ? $this->find($criteria) : $this->findAll($criteria);
}
}
|