Improve documentation

lib/Cake/Model/Datasource/Database/Mysql.php

@@ -141,6 +141,13 @@ class Mysql extends DboSource {
  */
 	protected $_charsets = array();
 
+/**
+ * Map of the columns contained in a result.
+ *
+ * @var array
+ */
+	public $map;
+
 /**
  * Connects to the database using options in the given configuration array.
  *
@@ -305,7 +312,7 @@ class Mysql extends DboSource {
  * Query charset by collation
  *
  * @param string $name Collation name
- * @return string Character set name
+ * @return string|false Character set name
  */
 	public function getCharsetName($name) {
 		if ((bool)version_compare($this->getVersion(), "5", "<")) {
@@ -391,7 +398,7 @@ class Mysql extends DboSource {
  * @param array $fields The fields to update.
  * @param array $values The values to set.
  * @param mixed $conditions The conditions to use.
- * @return array
+ * @return bool
  */
 	public function update(Model $model, $fields = array(), $values = null, $conditions = null) {
 		if (!$this->_useAlias) {
@@ -545,7 +552,7 @@ class Mysql extends DboSource {
  *
  * @param array $compare Result of a CakeSchema::compare()
  * @param string $table The table name.
- * @return array Array of alter statements to make.
+ * @return string|false String of alter statements to make.
  */
 	public function alterSchema($compare, $table = null) {
 		if (!is_array($compare)) {

lib/Cake/Model/Datasource/Database/Postgres.php

@@ -104,6 +104,13 @@ class Postgres extends DboSource {
  */
 	protected $_sqlOps = array('like', 'ilike', 'or', 'not', 'in', 'between', '~', '~\*', '\!~', '\!~\*', 'similar to');
 
+/**
+ * Map of the columns contained in a result.
+ *
+ * @var array
+ */
+	public $map;
+
 /**
  * Connects to the database using options in the given configuration array.
  *

lib/Cake/Model/Datasource/Database/Sqlite.php

@@ -102,6 +102,13 @@ class Sqlite extends DboSource {
 		),
 	);
 
+/**
+ * Map of the columns contained in a result.
+ *
+ * @var array
+ */
+	public $map;
+
 /**
  * Connects to the database using config['database'] as a filename.
  *

lib/Cake/Model/Datasource/Database/Sqlserver.php

@@ -106,6 +106,13 @@ class Sqlserver extends DboSource {
 		'boolean' => array('name' => 'bit')
 	);
 
+/**
+ * Map of the columns contained in a result.
+ *
+ * @var array
+ */
+	public $map;
+
 /**
  * Magic column name used to provide pagination support for SQLServer 2008
  * which lacks proper limit/offset support.