Database.php

<?php
class ZendDbSchema_Db_Schema_Database
    extends ZendDbSchema_Db_Schema_AbstractEntity
{
    const CHARSET_KEY = 'charset';

    protected $_loader;

    public function __construct(
            $name = null,
            ZendDbSchema_Db_Adapter_SchemaCompatible  $adapter = null,
            ZendDbSchema_Db_Schema_Loader_Database    $loader = null,
            ZendDbSchema_Db_Schema_Generator_Database $generator = null)
    {
        if (!$adapter) {
            $adapter = self::getDefaultAdapter();
        }

        if (!$loader || !$generator) {
            switch (true) {
                case $adapter instanceof Zend_Db_Adapter_Mysqli:
                case $adapter instanceof Zend_Db_Adapter_Pdo_Mysql:
                    if (!$loader) {
                        $loader = new ZendDbSchema_Db_Schema_Loader_Mysql_Database();
                    }
                    if (!$generator) {
                        $generator = new ZendDbSchema_Db_Schema_Generator_Mysql_Database();
                    }
                    break;
            }
        }
        //TODO check that adapter, generator and loader are same type

        $this->_generator = $generator;
        $this->_loader = $loader;
        $this->_adapter = $adapter;

        parent::__construct($name);
    }

    protected function _getAlterSql()
    {
        return $this->getGenerator()->alterDatabase($this);
    }

    protected function _getCreateSql()
    {
        return $this->getGenerator()->createDatabase($this);
    }

    protected function _getDropSql()
    {
        return $this->getGenerator()->dropDatabase($this);
    }

    protected function _doReload()
    {
        $this->_cleanSchema = $this->_loader->load(
            $this->getAdapter(),
            $this->getOriginName()
        );
    }

    public function setCharset($charset)
    {
        $this->__set(self::CHARSET_KEY, (string) $charset);
        return $this;
    }

    public function getCharset()
    {
        return $this->__get(self::CHARSET_KEY);
    }

    public function __set($name, $value)
    {
        if (self::NAME_KEY == $name && $value) {
            if ($this->_name != $value && $this->getAdapter()->hasDatabase($value)) {
                throw new ZendDbSchema_Db_Schema_Exception("Database with name '{$value}' already exists");
            }
        }
        parent::__set($name, $value);
    }
}