Primilary import of new db stuff

1 files changed, 340 insertions, 0 deletions

diff --git a/framework/Db/TDbCommand.php b/framework/Db/TDbCommand.php
new file mode 100755
index 00000000..df98a943
--- /dev/null
+++ b/framework/Db/TDbCommand.php
@@ -0,0 +1,340 @@
+<?php
+/**
+ * This file contains the TDbCommand class.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2009 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+/**
+ * TDbCommand represents an SQL statement to execute against a database.
+ *
+ * It is usually created by calling {@link TDbConnection::createCommand}.
+ * The SQL statement to be executed may be set via {@link setText Text}.
+ *
+ * To execute a non-query SQL (such as insert, delete, update), call
+ * {@link execute}. To execute an SQL statement that returns result data set
+ * (such as SELECT), use {@link query} or its convenient versions {@link queryRow},
+ * {@link queryColumn}, or {@link queryScalar}.
+ *
+ * If an SQL statement returns results (such as a SELECT SQL), the results
+ * can be accessed via the returned {@link TDbDataReader}.
+ *
+ * TDbCommand supports SQL statment preparation and parameter binding.
+ * Call {@link bindParam} to bind a PHP variable to a parameter in SQL.
+ * Call {@link bindValue} to bind a value to an SQL parameter.
+ * When binding a parameter, the SQL statement is automatically prepared.
+ * You may also call {@link prepare} to explicitly prepare an SQL statement.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package system.db
+ * @since 1.0
+ */
+class TDbCommand extends TComponent
+{
+	private $_connection;
+	private $_text='';
+	private $_statement=null;
+	private $_params;
+
+	/**
+	 * Constructor.
+	 * @param TDbConnection the database connection
+	 * @param string the SQL statement to be executed
+	 */
+	public function __construct(TDbConnection $connection,$text)
+	{
+		$this->_connection=$connection;
+		$this->setText($text);
+	}
+
+	/**
+	 * Set the statement to null when serializing.
+	 */
+	public function __sleep()
+	{
+		$this->_statement=null;
+		return array_keys(get_object_vars($this));
+	}
+
+	/**
+	 * @return string the SQL statement to be executed
+	 */
+	public function getText()
+	{
+		return $this->_text;
+	}
+
+	/**
+	 * Specifies the SQL statement to be executed.
+	 * Any previous execution will be terminated or cancel.
+	 * @param string the SQL statement to be executed
+	 */
+	public function setText($value)
+	{
+		$this->_text=$value;
+		$this->cancel();
+	}
+
+	/**
+	 * @return TDbConnection the connection associated with this command
+	 */
+	public function getConnection()
+	{
+		return $this->_connection;
+	}
+
+	/**
+	 * @return PDOStatement the underlying PDOStatement for this command
+	 * It could be null if the statement is not prepared yet.
+	 */
+	public function getPdoStatement()
+	{
+		return $this->_statement;
+	}
+
+	/**
+	 * Prepares the SQL statement to be executed.
+	 * For complex SQL statement that is to be executed multiple times,
+	 * this may improve performance.
+	 * For SQL statement with binding parameters, this method is invoked
+	 * automatically.
+	 */
+	public function prepare()
+	{
+		if($this->_statement==null)
+		{
+			try
+			{
+				$this->_statement=$this->getConnection()->getPdoInstance()->prepare($this->getText());
+				$this->_params=array();
+			}
+			catch(Exception $e)
+			{
+				Prado::log('Error in preparing SQL: '.$this->getText(),TLogger::ERROR,'system.db.TDbCommand');
+				throw new TDbException('TDbCommand failed to prepare the SQL statement: {0}',
+					$e->getMessage());
+			}
+		}
+	}
+
+	/**
+	 * Cancels the execution of the SQL statement.
+	 */
+	public function cancel()
+	{
+		$this->_statement=null;
+	}
+
+	/**
+	 * Binds a parameter to the SQL statement to be executed.
+	 * @param mixed Parameter identifier. For a prepared statement
+	 * using named placeholders, this will be a parameter name of
+	 * the form :name. For a prepared statement using question mark
+	 * placeholders, this will be the 1-indexed position of the parameter.
+	 * @param mixed Name of the PHP variable to bind to the SQL statement parameter
+	 * @param int SQL data type of the parameter. If null, the type is determined by the PHP type of the value.
+	 * @param int length of the data type
+	 * @see http://www.php.net/manual/en/function.PDOStatement-bindParam.php
+	 */
+	public function bindParameter($name, &$value, $dataType=null, $length=null)
+	{
+		$this->prepare();
+		if($dataType===null)
+			$this->_statement->bindParam($name,$value,$this->_connection->getPdoType(gettype($value)));
+		else if($length===null)
+			$this->_statement->bindParam($name,$value,$dataType);
+		else
+			$this->_statement->bindParam($name,$value,$dataType,$length);
+		if($this->_connection->enableParamLogging)
+			$this->_params[]=$name.'=['.gettype($value).']';
+	}
+
+
+	/**
+	 * Binds a value to a parameter.
+	 * @param mixed Parameter identifier. For a prepared statement
+	 * using named placeholders, this will be a parameter name of
+	 * the form :name. For a prepared statement using question mark
+	 * placeholders, this will be the 1-indexed position of the parameter.
+	 * @param mixed The value to bind to the parameter
+	 * @param int SQL data type of the parameter. If null, the type is determined by the PHP type of the value.
+	 * @see http://www.php.net/manual/en/function.PDOStatement-bindValue.php
+	 */
+	public function bindValue($name, $value, $dataType=null)
+	{
+		$this->prepare();
+		if($dataType===null)
+			$this->_statement->bindValue($name,$value,$this->_connection->getPdoType(gettype($value)));
+		else
+			$this->_statement->bindValue($name,$value,$dataType);
+		if($this->_connection->enableParamLogging)
+			$this->_params[]=$name.'='.var_export($value,true);
+	}
+
+	/**
+	 * Executes the SQL statement.
+	 * This method is meant only for executing non-query SQL statement.
+	 * No result set will be returned.
+	 * @return integer number of rows affected by the execution.
+	 * @throws CException execution failed
+	 */
+	public function execute()
+	{
+		$params=$this->_connection->enableParamLogging && !empty($this->_params) ? '. Bind with parameter ' . implode(', ',$this->_params) : '';
+		Prado::trace('Executing SQL: '.$this->getText().$params,'system.db.TDbCommand');
+		try
+		{
+			/*if($this->_connection->enableProfiling)
+				Yii::beginProfile('system.db.TDbCommand.execute('.$this->getText().')','system.db.TDbCommand.execute');
+			*/
+			if($this->_statement instanceof PDOStatement)
+			{
+				$this->_statement->execute();
+				$n=$this->_statement->rowCount();
+			}
+			else
+				$n=$this->getConnection()->getPdoInstance()->exec($this->getText());
+
+			/*if($this->_connection->enableProfiling)
+				Yii::endProfile('system.db.TDbCommand.execute('.$this->getText().')','system.db.TDbCommand.execute');
+			*/
+			return $n;
+		}
+		catch(Exception $e)
+		{
+			/*if($this->_connection->enableProfiling)
+				Yii::endProfile('system.db.TDbCommand.execute('.$this->getText().')','system.db.TDbCommand.execute');
+			 */
+			Prado::log('Error in executing SQL: '.$this->getText().$params,TLogger::ERROR,'system.db.TDbCommand');
+			throw new TDbException('TDbCommand failed to execute the SQL statement: {0}',
+				$e->getMessage());
+		}
+	}
+
+	/**
+	 * @return String prepared SQL text for debugging purposes.
+	 */
+	public function getDebugStatementText()
+	{
+		if(Prado::getApplication()->getMode() === TApplicationMode::Debug)
+		{
+			$params=$this->_connection->enableParamLogging && !empty($this->_params) ? '. Bind with parameter ' . implode(', ',$this->_params) : '';
+			return $this->_statement instanceof PDOStatement ?
+				$this->_statement->queryString.$params
+				: $this->getText().$params;
+
+		}
+	}
+
+	/**
+	 * Executes the SQL statement and returns query result.
+	 * This method is for executing an SQL query that returns result set.
+	 * @return TDbDataReader the reader object for fetching the query result
+	 * @throws CException execution failed
+	 */
+	public function query()
+	{
+		return $this->queryInternal('',0);
+	}
+
+	/**
+	 * Executes the SQL statement and returns all rows.
+	 * @param boolean whether each row should be returned as an associated array with
+	 * column names as the keys or the array keys are column indexes (0-based).
+	 * @return array all rows of the query result. Each array element is an array representing a row.
+	 * An empty array is returned if the query results in nothing.
+	 * @throws CException execution failed
+	 */
+	public function queryAll($fetchAssociative=true)
+	{
+		return $this->queryInternal('fetchAll',$fetchAssociative ? PDO::FETCH_ASSOC : PDO::FETCH_NUM);
+	}
+
+	/**
+	 * Executes the SQL statement and returns the first row of the result.
+	 * This is a convenient method of {@link query} when only the first row of data is needed.
+	 * @param boolean whether the row should be returned as an associated array with
+	 * column names as the keys or the array keys are column indexes (0-based).
+	 * @return array the first row of the query result, false if no result.
+	 * @throws CException execution failed
+	 */
+	public function queryRow($fetchAssociative=true)
+	{
+		return $this->queryInternal('fetch',$fetchAssociative ? PDO::FETCH_ASSOC : PDO::FETCH_NUM);
+	}
+
+	/**
+	 * Executes the SQL statement and returns the value of the first column in the first row of data.
+	 * This is a convenient method of {@link query} when only a single scalar
+	 * value is needed (e.g. obtaining the count of the records).
+	 * @return mixed the value of the first column in the first row of the query result. False is returned if there is no value.
+	 * @throws CException execution failed
+	 */
+	public function queryScalar()
+	{
+		$result=$this->queryInternal('fetchColumn',0);
+		if(is_resource($result) && get_resource_type($result)==='stream')
+			return stream_get_contents($result);
+		else
+			return $result;
+	}
+
+	/**
+	 * Executes the SQL statement and returns the first column of the result.
+	 * This is a convenient method of {@link query} when only the first column of data is needed.
+	 * Note, the column returned will contain the first element in each row of result.
+	 * @return array the first column of the query result. Empty array if no result.
+	 * @throws CException execution failed
+	 */
+	public function queryColumn()
+	{
+		return $this->queryInternal('fetchAll',PDO::FETCH_COLUMN);
+	}
+
+	/**
+	 * @param string method of PDOStatement to be called
+	 * @param mixed the first parameter to be passed to the method
+	 * @return mixed the method execution result
+	 */
+	private function queryInternal($method,$mode)
+	{
+		$params=$this->_connection->enableParamLogging && !empty($this->_params) ? '. Bind with parameter ' . implode(', ',$this->_params) : '';
+		Prado::trace('Querying SQL: '.$this->getText().$params,'system.db.TDbCommand');
+		try
+		{
+			/*if($this->_connection->enableProfiling)
+				Yii::beginProfile('system.db.TDbCommand.query('.$this->getText().')','system.db.TDbCommand.query');
+			*/
+			if($this->_statement instanceof PDOStatement)
+				$this->_statement->execute();
+			else
+				$this->_statement=$this->getConnection()->getPdoInstance()->query($this->getText());
+
+			if($method==='')
+				$result=new TDbDataReader($this);
+			else
+			{
+				$result=$this->_statement->{$method}($mode);
+				$this->_statement->closeCursor();
+			}
+
+			/*if($this->_connection->enableProfiling)
+				Yii::endProfile('system.db.TDbCommand.query('.$this->getText().')','system.db.TDbCommand.query');
+			 */
+			return $result;
+		}
+		catch(Exception $e)
+		{
+/*			if($this->_connection->enableProfiling)
+				Yii::endProfile('system.db.TDbCommand.query('.$this->getText().')','system.db.TDbCommand.query');
+ */
+			Prado::log('Error in querying SQL: '.$this->getText().$params,TLogger::ERROR,'system.db.TDbCommand');
+			throw new TDbException('TDbCommand failed to execute the SQL statement: {0}',
+				$e->getMessage());
+		}
+	}
+}