<?php
/*
 *  $Id$
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the LGPL. For more information, see
 * <http://www.phpdoctrine.com>.
 */
Doctrine::autoload('Doctrine_Export');
/**
 * Doctrine_Export_Sqlite
 *
 * @package     Doctrine
 * @author      Konsta Vesterinen <kvesteri@cc.hut.fi>
 * @author      Lukas Smith <smith@pooteeweet.org> (PEAR MDB2 library)
 * @license     http://www.opensource.org/licenses/lgpl-license.php LGPL
 * @category    Object Relational Mapping
 * @link        www.phpdoctrine.com
 * @since       1.0
 * @version     $Revision$
 */
class Doctrine_Export_Sqlite extends Doctrine_Export
{
    /**
     * Get the stucture of a field into an array
     *
     * @param string    $table         name of the table on which the index is to be created
     * @param string    $name         name of the index to be created
     * @param array     $definition        associative array that defines properties of the index to be created.
     *                                 Currently, only one property named FIELDS is supported. This property
     *                                 is also an associative with the names of the index fields as array
     *                                 indexes. Each entry of this array is set to another type of associative
     *                                 array that specifies properties of the index that are specific to
     *                                 each field.
     *
     *                                Currently, only the sorting property is supported. It should be used
     *                                 to define the sorting direction of the index. It may be set to either
     *                                 ascending or descending.
     *
     *                                Not all DBMS support index sorting direction configuration. The DBMS
     *                                 drivers of those that do not support it ignore this property. Use the
     *                                 function support() to determine whether the DBMS driver can manage indexes.

     *                                 Example
     *                                    array(
     *                                        'fields' => array(
     *                                            'user_name' => array(
     *                                                'sorting' => 'ascending'
     *                                            ),
     *                                            'last_login' => array()
     *                                        )
     *                                    )
     * @throws PDOException
     * @return void
     */
    public function createIndex($table, $name, array $definition)
    {
        $table = $this->conn->quoteIdentifier($table, true);
        $name  = $this->conn->getIndexName($name);
        $query = 'CREATE INDEX ' . $name . ' ON ' . $table;
        $fields = array();
        foreach ($definition['fields'] as $fieldName => $field) {
            $fieldString = $fieldName;
            if (isset($field['sorting'])) {
                switch ($field['sorting']) {
                    case 'ascending':
                        $fieldString .= ' ASC';
                        break;
                    case 'descending':
                        $fieldString .= ' DESC';
                        break;
                }
            }
            $fields[] = $fieldString;
        }
        $query .= ' (' . implode(', ', $fields) . ')';

        return $this->conn->exec($query);
    }
    /**
     * create sequence
     *
     * @param string    $seqName        name of the sequence to be created
     * @param string    $start          start value of the sequence; default is 1
     * @return boolean
     */
    public function createSequence($seqName, $start = 1)
    {
        $sequenceName   = $this->conn->quoteIdentifier($this->conn->getSequenceName($seqName), true);
        $seqcolName     = $this->conn->quoteIdentifier($this->conn->getAttribute(Doctrine::ATTR_SEQCOL_NAME), true);
        $query          = 'CREATE TABLE ' . $sequenceName . ' (' . $seqcolName . ' INTEGER PRIMARY KEY DEFAULT 0 NOT NULL)';
        
        $this->conn->exec($query);

        if ($start == 1) {
            return true;
        }

        try {
            $this->conn->exec('INSERT INTO ' . $sequenceName . ' (' . $seqcolName . ') VALUES (' . ($start-1) . ')');
            return true;
        } catch(Doctrine_Connection_Exception $e) {
            // Handle error
            try {
                $result = $db->exec('DROP TABLE ' . $sequenceName);
            } catch(Doctrine_Connection_Exception $e) {
                throw new Doctrine_Export_Exception('could not drop inconsistent sequence table');
            }
        }
        throw new Doctrine_Export_Exception('could not create sequence table');
    }
    /**
     * drop existing sequence
     *
     * @param string    $seq_name     name of the sequence to be dropped
     * @return boolean
     */
    public function dropSequence($seq_name)
    {
        $sequenceName   = $this->conn->quoteIdentifier($this->conn->getSequenceName($seqName), true);
        return $this->conn->exec('DROP TABLE ' . $sequenceName);
    }
}