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<?php
// +----------------------------------------------------------------------+
// | PHP versions 4 and 5 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1998-2006 Manuel Lemos, Tomas V.V.Cox, |
// | Stig. S. Bakken, Lukas Smith |
// | All rights reserved. |
// +----------------------------------------------------------------------+
// | MDB2 is a merge of PEAR DB and Metabases that provides a unified DB |
// | API as well as database abstraction for PHP applications. |
// | This LICENSE is in the BSD license style. |
// | |
// | Redistribution and use in source and binary forms, with or without |
// | modification, are permitted provided that the following conditions |
// | are met: |
// | |
// | Redistributions of source code must retain the above copyright |
// | notice, this list of conditions and the following disclaimer. |
// | |
// | Redistributions in binary form must reproduce the above copyright |
// | notice, this list of conditions and the following disclaimer in the |
// | documentation and/or other materials provided with the distribution. |
// | |
// | Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken, |
// | Lukas Smith nor the names of his contributors may be used to endorse |
// | or promote products derived from this software without specific prior|
// | written permission. |
// | |
// | 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 |
// | REGENTS 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. |
// +----------------------------------------------------------------------+
// | Author: Lukas Smith <smith@pooteeweet.org> |
// +----------------------------------------------------------------------+
//
// $Id: Common.php,v 1.35 2007/02/25 11:14:34 quipo Exp $
//

/**
 * @package MDB2
 * @category Database
 */

/**
 * These are constants for the tableInfo-function
 * they are bitwised or'ed. so if there are more constants to be defined
 * in the future, adjust MDB2_TABLEINFO_FULL accordingly
 */

define('MDB2_TABLEINFO_ORDER',      1);
define('MDB2_TABLEINFO_ORDERTABLE', 2);
define('MDB2_TABLEINFO_FULL',       3);

/**
 * Base class for the schema reverse engineering module that is extended by each MDB2 driver
 *
 * @package MDB2
 * @category Database
 * @author Lukas Smith <smith@pooteeweet.org>
 */
class MDB2_Driver_Reverse_Common extends MDB2_Module_Common
{
 // }}}
 // {{{ getTableFieldDefinition()

/**
     * Get the structure of a field into an array
     *
     * @param string    $table     name of table that should be used in method
     * @param string    $field     name of field that should be used in method
     * @return mixed data array on success, a MDB2 error on failure.
     *          The returned array contains an array for each field definition,
     *          with all or some of these indices, depending on the field data type:
     *          [notnull] [nativetype] [length] [fixed] [default] [type] [mdb2type]
     * @access public
     */
    function getTableFieldDefinition($table, $field)
    {
        $db =& $this->getDBInstance();
        if (PEAR::isError($db)) {
            return $db;
        }

return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
            'method not implemented', __FUNCTION__);
    }

// }}}
    // {{{ getTableIndexDefinition()

/**
 * Get the structure of an index into an array
 *
 * @param string $table name of table that should be used in method
 * @param string $index name of index that should be used in method
 * @return mixed data array on success, a MDB2 error on failure
 * The returned array has this structure:
 * </pre>
 * array (
 * [fields] => array (
 * [field1name] => array() // one entry per each field covered
 * [field2name] => array() // by the index
 * [field3name] => array(
 * [sorting] => ascending
 * )
 * )
 * );
 * </pre>
 * @access public
 */
 function getTableIndexDefinition($table, $index)
 {
 $db =& $this->getDBInstance();
 if (PEAR::isError($db)) {
 return $db;
 }

return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
            'method not implemented', __FUNCTION__);
    }

// }}}
    // {{{ getTableConstraintDefinition()

/**
 * Get the structure of an constraints into an array
 *
 * @param string $table name of table that should be used in method
 * @param string $index name of index that should be used in method
 * @return mixed data array on success, a MDB2 error on failure
 * The returned array has this structure:
 * <pre>
 * array (
 * [primary] => 1
 * [fields] => array (
 * [field1name] => array() // one entry per each field covered
 * [field2name] => array() // by the index
 * [field3name] => array(
 * [sorting] => ascending
 * )
 * )
 * );
 * </pre>
 * @access public
 */
 function getTableConstraintDefinition($table, $index)
 {
 $db =& $this->getDBInstance();
 if (PEAR::isError($db)) {
 return $db;
 }

return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
            'method not implemented', __FUNCTION__);
    }

// }}}
    // {{{ getSequenceDefinition()

/**
 * Get the structure of a sequence into an array
 *
 * @param string $sequence name of sequence that should be used in method
 * @return mixed data array on success, a MDB2 error on failure
 * The returned array has this structure:
 * <pre>
 * array (
 * [start] => n
 * );
 * </pre>
 * @access public
 */
 function getSequenceDefinition($sequence)
 {
 $db =& $this->getDBInstance();
 if (PEAR::isError($db)) {
 return $db;
 }

$start = $db->currId($sequence);
        if (PEAR::isError($start)) {
            return $start;
        }
        if ($db->supports('current_id')) {
            $start++;
        } else {
            $db->warnings[] = 'database does not support getting current
                sequence value, the sequence value was incremented';
        }
        $definition = array();
        if ($start != 1) {
            $definition = array('start' => $start);
        }
        return $definition;
    }

// }}}
    // {{{ getTriggerDefinition()

/**
 * Get the structure of a trigger into an array
 *
 * EXPERIMENTAL
 *
 * WARNING: this function is experimental and may change the returned value 
 * at any time until labelled as non-experimental
 *
 * @param string $trigger name of trigger that should be used in method
 * @return mixed data array on success, a MDB2 error on failure
 * The returned array has this structure:
 * <pre>
 * array (
 * [trigger_name] => 'trigger name',
 * [table_name] => 'table name',
 * [trigger_body] => 'trigger body definition',
 * [trigger_type] => 'BEFORE' | 'AFTER',
 * [trigger_event] => 'INSERT' | 'UPDATE' | 'DELETE'
 * //or comma separated list of multiple events, when supported
 * [trigger_enabled] => true|false
 * [trigger_comment] => 'trigger comment',
 * );
 * </pre>
 * The oci8 driver also returns a [when_clause] index.
 * @access public
 */
 function getTriggerDefinition($trigger)
 {
 $db =& $this->getDBInstance();
 if (PEAR::isError($db)) {
 return $db;
 }

return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
            'method not implemented', __FUNCTION__);
    }

// }}}
    // {{{ tableInfo()

/**
 * Returns information about a table or a result set
 *
 * The format of the resulting array depends on which <var>$mode</var>
 * you select. The sample output below is based on this query:
 * <pre>
 * SELECT tblFoo.fldID, tblFoo.fldPhone, tblBar.fldId
 * FROM tblFoo
 * JOIN tblBar ON tblFoo.fldId = tblBar.fldId
 * </pre>
 *
 * <ul>
 * <li>
 *
 * <kbd>null</kbd> (default)
 * <pre>
 * [0] => Array (
 * [table] => tblFoo
 * [name] => fldId
 * [type] => int
 * [len] => 11
 * [flags] => primary_key not_null
 * )
 * [1] => Array (
 * [table] => tblFoo
 * [name] => fldPhone
 * [type] => string
 * [len] => 20
 * [flags] =>
 * )
 * [2] => Array (
 * [table] => tblBar
 * [name] => fldId
 * [type] => int
 * [len] => 11
 * [flags] => primary_key not_null
 * )
 * </pre>
 *
 * </li><li>
 *
 * <kbd>MDB2_TABLEINFO_ORDER</kbd>
 *
 * In addition to the information found in the default output,
 * a notation of the number of columns is provided by the
 * <samp>num_fields</samp> element while the <samp>order</samp>
 * element provides an array with the column names as the keys and
 * their location index number (corresponding to the keys in the
 * the default output) as the values.
 *
 * If a result set has identical field names, the last one is
 * used.
 *
 * <pre>
 * [num_fields] => 3
 * [order] => Array (
 * [fldId] => 2
 * [fldTrans] => 1
 * )
 * </pre>
 *
 * </li><li>
 *
 * <kbd>MDB2_TABLEINFO_ORDERTABLE</kbd>
 *
 * Similar to <kbd>MDB2_TABLEINFO_ORDER</kbd> but adds more
 * dimensions to the array in which the table names are keys and
 * the field names are sub-keys. This is helpful for queries that
 * join tables which have identical field names.
 *
 * <pre>
 * [num_fields] => 3
 * [ordertable] => Array (
 * [tblFoo] => Array (
 * [fldId] => 0
 * [fldPhone] => 1
 * )
 * [tblBar] => Array (
 * [fldId] => 2
 * )
 * )
 * </pre>
 *
 * </li>
 * </ul>
 *
 * The <samp>flags</samp> element contains a space separated list
 * of extra information about the field. This data is inconsistent
 * between DBMS's due to the way each DBMS works.
 * + <samp>primary_key</samp>
 * + <samp>unique_key</samp>
 * + <samp>multiple_key</samp>
 * + <samp>not_null</samp>
 *
 * Most DBMS's only provide the <samp>table</samp> and <samp>flags</samp>
 * elements if <var>$result</var> is a table name. The following DBMS's
 * provide full information from queries:
 * + fbsql
 * + mysql
 *
 * If the 'portability' option has <samp>MDB2_PORTABILITY_FIX_CASE</samp>
 * turned on, the names of tables and fields will be lower or upper cased.
 *
 * @param object|string $result MDB2_result object from a query or a
 * string containing the name of a table.
 * While this also accepts a query result
 * resource identifier, this behavior is
 * deprecated.
 * @param int $mode either unused or one of the tableInfo modes:
 * <kbd>MDB2_TABLEINFO_ORDERTABLE</kbd>,
 * <kbd>MDB2_TABLEINFO_ORDER</kbd> or
 * <kbd>MDB2_TABLEINFO_FULL</kbd> (which does both).
 * These are bitwise, so the first two can be
 * combined using <kbd>|</kbd>.
 *
 * @return array an associative array with the information requested.
 * A MDB2_Error object on failure.
 *
 * @see MDB2_Driver_Common::setOption()
 */
 function tableInfo($result, $mode = null)
 {
 $db =& $this->getDBInstance();
 if (PEAR::isError($db)) {
 return $db;
 }

if (!is_string($result)) {
            return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
                'method not implemented', __FUNCTION__);
        }

$db->loadModule('Manager', null, true);
        $fields = $db->manager->listTableFields($result);
        if (PEAR::isError($fields)) {
            return $fields;
        }

$flags = array();

$idxname_format = $db->getOption('idxname_format');
        $db->setOption('idxname_format', '%s');

$indexes = $db->manager->listTableIndexes($result);
        if (PEAR::isError($indexes)) {
            $db->setOption('idxname_format', $idxname_format);
            return $indexes;
        }

foreach ($indexes as $index) {
            $definition = $this->getTableIndexDefinition($result, $index);
            if (PEAR::isError($definition)) {
                $db->setOption('idxname_format', $idxname_format);
                return $definition;
            }
            if (count($definition['fields']) > 1) {
                foreach ($definition['fields'] as $field => $sort) {
                    $flags[$field] = 'multiple_key';
                }
            }
        }

$constraints = $db->manager->listTableConstraints($result);
        if (PEAR::isError($constraints)) {
            return $constraints;
        }

foreach ($constraints as $constraint) {
            $definition = $this->getTableConstraintDefinition($result, $constraint);
            if (PEAR::isError($definition)) {
                $db->setOption('idxname_format', $idxname_format);
                return $definition;
            }
            $flag = !empty($definition['primary'])
                ? 'primary_key' : (!empty($definition['unique'])
                    ? 'unique_key' : false);
            if ($flag) {
                foreach ($definition['fields'] as $field => $sort) {
                    if (empty($flags[$field]) || $flags[$field] != 'primary_key') {
                        $flags[$field] = $flag;
                    }
                }
            }
        }

if ($mode) {
            $res['num_fields'] = count($fields);
        }

foreach ($fields as $i => $field) {
            $definition = $this->getTableFieldDefinition($result, $field);
            if (PEAR::isError($definition)) {
                $db->setOption('idxname_format', $idxname_format);
                return $definition;
            }
            $res[$i] = $definition[0];
            $res[$i]['name'] = $field;
            $res[$i]['table'] = $result;
            $res[$i]['type'] = preg_replace('/^([a-z]+).*$/i', '\\1', trim($definition[0]['nativetype']));
            // 'primary_key', 'unique_key', 'multiple_key'
            $res[$i]['flags'] = empty($flags[$field]) ? '' : $flags[$field];
            // not_null', 'unsigned', 'auto_increment', 'default_[rawencodedvalue]'
            if (!empty($res[$i]['notnull'])) {
                $res[$i]['flags'].= ' not_null';
            }
            if (!empty($res[$i]['unsigned'])) {
                $res[$i]['flags'].= ' unsigned';
            }
            if (!empty($res[$i]['auto_increment'])) {
                $res[$i]['flags'].= ' autoincrement';
            }
            if (!empty($res[$i]['default'])) {
                $res[$i]['flags'].= ' default_'.rawurlencode($res[$i]['default']);
            }

if ($mode & MDB2_TABLEINFO_ORDER) {
                $res['order'][$res[$i]['name']] = $i;
            }
            if ($mode & MDB2_TABLEINFO_ORDERTABLE) {
                $res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;
            }
        }

$db->setOption('idxname_format', $idxname_format);
        return $res;
    }
}
?>