From 3f0149b5b74d4017ba7f4ca28aa8a3e2053db964 Mon Sep 17 00:00:00 2001
From: "Christophe.Boulain" <>
Date: Mon, 15 Jun 2009 07:49:42 +0000
Subject: Primilary import of new db stuff

---
 framework/Db/schema/TDbColumnSchema.php | 145 ++++++++++++++++++++++++++++++++
 1 file changed, 145 insertions(+)
 create mode 100755 framework/Db/schema/TDbColumnSchema.php

(limited to 'framework/Db/schema/TDbColumnSchema.php')

diff --git a/framework/Db/schema/TDbColumnSchema.php b/framework/Db/schema/TDbColumnSchema.php
new file mode 100755
index 00000000..094ef8e0
--- /dev/null
+++ b/framework/Db/schema/TDbColumnSchema.php
@@ -0,0 +1,145 @@
+<?php
+/**
+ * TDbColumnSchema class file.
+ *
+ * @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/
+ */
+
+prado::using('System.db.schema.TDbExpression');
+
+/**
+ * TDbColumnSchema class describes the column meta data of a database table.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package system.db.schema
+ * @since 1.0
+ */
+class TDbColumnSchema extends TComponent
+{
+	/**
+	 * @var string name of this column (without quotes).
+	 */
+	public $name;
+	/**
+	 * @var string raw name of this column. This is the quoted name that can be used in SQL queries.
+	 */
+	public $rawName;
+	/**
+	 * @var boolean whether this column can be null.
+	 */
+	public $allowNull;
+	/**
+	 * @var string the DB type of this column.
+	 */
+	public $dbType;
+	/**
+	 * @var string the PHP type of this column.
+	 */
+	public $type;
+	/**
+	 * @var mixed default value of this column
+	 */
+	public $defaultValue;
+	/**
+	 * @var integer size of the column.
+	 */
+	public $size;
+	/**
+	 * @var integer precision of the column data, if it is numeric.
+	 */
+	public $precision;
+	/**
+	 * @var integer scale of the column data, if it is numeric.
+	 */
+	public $scale;
+	/**
+	 * @var boolean whether this column is a primary key
+	 */
+	public $isPrimaryKey;
+	/**
+	 * @var boolean whether this column is a foreign key
+	 */
+	public $isForeignKey;
+
+
+	/**
+	 * Initializes the column with its DB type and default value.
+	 * This sets up the column's PHP type, size, precision, scale as well as default value.
+	 * @param string the column's DB type
+	 * @param mixed the default value
+	 */
+	public function init($dbType, $defaultValue)
+	{
+		$this->dbType=$dbType;
+		$this->extractType($dbType);
+		$this->extractLimit($dbType);
+		if($defaultValue!==null)
+			$this->extractDefault($defaultValue);
+	}
+
+	/**
+	 * Extracts the PHP type from DB type.
+	 * @param string DB type
+	 */
+	protected function extractType($dbType)
+	{
+		if(stripos($dbType,'int')!==false)
+			$this->type='integer';
+		else if(stripos($dbType,'bool')!==false)
+			$this->type='boolean';
+		else if(preg_match('/(real|floa|doub)/i',$dbType))
+			$this->type='double';
+		else
+			$this->type='string';
+	}
+
+	/**
+	 * Extracts size, precision and scale information from column's DB type.
+	 * @param string the column's DB type
+	 */
+	protected function extractLimit($dbType)
+	{
+		if(strpos($dbType,'(') && preg_match('/\((.*)\)/',$dbType,$matches))
+		{
+			$values=explode(',',$matches[1]);
+			$this->size=$this->precision=(int)$values[0];
+			if(isset($values[1]))
+				$this->scale=(int)$values[1];
+		}
+	}
+
+	/**
+	 * Extracts the default value for the column.
+	 * The value is typecasted to correct PHP type.
+	 * @param mixed the default value obtained from metadata
+	 */
+	protected function extractDefault($defaultValue)
+	{
+		$this->defaultValue=$this->typecast($defaultValue);
+	}
+
+	/**
+	 * Converts the input value to the type that this column is of.
+	 * @param mixed input value
+	 * @return mixed converted value
+	 */
+	public function typecast($value)
+	{
+		if(gettype($value)===$this->type || $value===null || $value instanceof TDbExpression)
+			return $value;
+		if($value==='')
+			return $this->type==='string' ? '' : null;
+		switch($this->type)
+		{
+			case 'integer': return (integer)$value;
+			case 'boolean': return (boolean)$value;
+			case 'double': return (double)$value;
+			case 'string': return (string)$value;
+			default: return $value;
+		}
+	}
+}
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