1 files changed, 262 insertions, 0 deletions
diff --git a/framework/Data/TDbCommand.php b/framework/Data/TDbCommand.php
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+++ b/framework/Data/TDbCommand.php
@@ -0,0 +1,262 @@
+<?php
+/**
+ * TDbCommand class file
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.pradosoft.com/
+ * @copyright Copyright &copy; 2006 PradoSoft
+ * @license http://www.pradosoft.com/license/
+ * @version $Id $
+ * @package System.Data
+ */
+
+/**
+ * TDbCommand class.
+ *
+ * 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}
+ * and {@link queryScalar}.
+ *
+ * TDbCommand supports SQL statment preparation and parameter binding.
+ * Call {@link bindParameter} 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.Data
+ * @since 3.0
+ */
+class TDbCommand extends TComponent
+{
+	private $_connection;
+	private $_text='';
+	private $_statement=null;
+
+	/**
+	 * 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);
+	}
+
+	/**
+	 * @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 created 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($sql);
+			}
+			catch(Exception $e)
+			{
+				throw new TDbException('dbcommand_prepare_failed',$e->getMessage());
+			}
+		}
+	}
+
+	/**
+	 * Cancels the execution of the SQL statement.
+	 */
+	public function cancel()
+	{
+		$this->_statement=null;
+	}
+
+	/**
+	 * Binds a parameter to the SQL statement to be executed.
+	 * @param mixed Parameter identifier. For a prepared statement
+	 * using named placeholders, this will be a parameter name of
+	 * the form :name. For a prepared statement using question mark
+	 * placeholders, this will be the 1-indexed position of the parameter.
+	 * @param mixed Name of the PHP variable to bind to the SQL statement parameter
+	 * @param int SQL data type of the parameter
+	 * @param int length of the data type
+	 * @see http://www.php.net/manual/en/function.pdostatement-bindparam.php
+	 */
+	public function bindParameter($name, &$value, $dataType=null, $length=null)
+	{
+		$this->prepare();
+		if($dataType===null)
+			$this->_statement->bindParam($name,$value);
+		else if($length===null)
+			$this->_statement->bindParam($name,$value,$dataType);
+		else
+			$this->_statement->bindParam($name,$value,$dataType,$length);
+	}
+
+	/**
+	 * Binds a value to a parameter.
+	 * @param mixed Parameter identifier. For a prepared statement
+	 * using named placeholders, this will be a parameter name of
+	 * the form :name. For a prepared statement using question mark
+	 * placeholders, this will be the 1-indexed position of the parameter.
+	 * @param mixed The value to bind to the parameter
+	 * @param int SQL data type of the parameter
+	 * @see http://www.php.net/manual/en/function.pdostatement-bindvalue.php
+	 */
+	public function bindValue($name, $value, $dataType=null)
+	{
+		$this->prepare();
+		if($dataType===null)
+			$this->_statement->bindParam($name,$value);
+		else
+			$this->_statement->bindParam($name,$value,$dataType);
+	}
+
+	/**
+	 * 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 TDbException execution failed
+	 */
+	public function execute()
+	{
+		try
+		{
+			if($this->_statement instanceof PDOStatement)
+			{
+				$this->_statement->execute();
+				return $this->_statement->rowCount();
+			}
+			else
+				return $this->getConnection()->getPdoInstance()->exec($this->getText());
+		}
+		catch(Exception $e)
+		{
+			throw new TDbException('dbcommand_execute_failed',$e->getMessage());
+		}
+	}
+
+	/**
+	 * 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 TDbException execution failed
+	 */
+	public function query()
+	{
+		try
+		{
+			if($this->_statement instanceof PDOStatement)
+				$this->_statement->execute();
+			else
+				$this->_statement=$this->getConnection()->getPdoInstance()->query($this->getText());
+			return new TDbDataReader($this);
+		}
+		catch(Exception $e)
+		{
+			throw new TDbException('dbcommand_query_failed',$e->getMessage());
+		}
+	}
+
+	/**
+	 * 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 not result.
+	 * @throws TDbException execution failed
+	 */
+	public function queryRow($fetchAssociative=true)
+	{
+		try
+		{
+			if($this->_statement instanceof PDOStatement)
+				$this->_statement->execute();
+			else
+				$this->_statement=$this->getConnection()->getPdoInstance()->query($sql);
+			$result=$this->_statement->fetch($fetchAssociative ? PDO::FETCH_ASSOC : PDO::FETCH_NUM);
+			$this->_statement->closeCursor();
+			return $result;
+		}
+		catch(Exception $e)
+		{
+			throw new TDbException('dbcommand_query_failed',$e->getMessage());
+		}
+	}
+
+	/**
+	 * 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.
+	 * @throws TDbException execution failed or there is no data
+	 */
+	public function queryScalar()
+	{
+		try
+		{
+			if($this->_statement instanceof PDOStatement)
+				$this->_statement->execute();
+			else
+				$this->_statement=$this->getConnection()->getPdoInstance()->query($sql);
+			$result=$this->_statement->fetchColumn();
+			$this->_statement->closeCursor();
+			if($result!==false)
+				return $result;
+			else
+				throw new TDbException('dbcommand_column_empty');
+		}
+		catch(Exception $e)
+		{
+			throw new TDbException('dbcommand_queryscalar_failed',$e->getMessage());
+		}
+	}
+}
+
+?>
+\ No newline at end of file