440 lines
17 KiB
PHP
440 lines
17 KiB
PHP
<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
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/**
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* Index, constraint and alter methods for DB_Table usage with
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* PEAR::DB as backend.
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*
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* The code in this class was adopted from the MDB2 PEAR package.
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*
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* PHP versions 4 and 5
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*
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* LICENSE:
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*
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* Copyright (c) 1997-2007, Paul Cooper <pgc@ucecom.com>
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* Paul M. Jones <pmjones@php.net>
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* David C. Morse <morse@php.net>
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* Mark Wiesemann <wiesemann@php.net>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * The names of the authors may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @category Database
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* @package DB_Table
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* @author Paul Cooper <pgc@ucecom.com>
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* @author Mark Wiesemann <wiesemann@php.net>
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* @license http://opensource.org/licenses/bsd-license.php New BSD License
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* @version CVS: $Id: pgsql.php,v 1.5 2007/12/13 16:52:15 wiesemann Exp $
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* @link http://pear.php.net/package/DB_Table
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*/
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/**
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* require DB_Table class
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*/
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require_once 'DB/Table.php';
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/**
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* Index, constraint and alter methods for DB_Table usage with
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* PEAR::DB as backend.
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*
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* The code in this class was adopted from the MDB2 PEAR package.
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*
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* @category Database
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* @package DB_Table
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* @author Paul Cooper <pgc@ucecom.com>
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* @author Mark Wiesemann <wiesemann@php.net>
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* @version Release: 1.5.6
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* @link http://pear.php.net/package/DB_Table
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*/
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class DB_Table_Manager_pgsql {
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/**
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*
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* The PEAR DB object that connects to the database.
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*
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* @access private
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*
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* @var object
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*
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*/
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var $_db = null;
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/**
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* list all indexes in a table
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*
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* @param string $table name of table that should be used in method
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* @return mixed data array on success, a PEAR error on failure
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* @access public
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*/
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function listTableIndexes($table)
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{
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$subquery = "SELECT indexrelid FROM pg_index, pg_class";
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$subquery.= " WHERE pg_class.relname='$table' AND pg_class.oid=pg_index.indrelid AND indisunique != 't' AND indisprimary != 't'";
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$query = "SELECT relname FROM pg_class WHERE oid IN ($subquery)";
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$indexes = $this->_db->getCol($query);
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if (PEAR::isError($indexes)) {
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return $indexes;
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}
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$result = array();
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foreach ($indexes as $index) {
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$result[$index] = true;
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}
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$result = array_change_key_case($result, CASE_LOWER);
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return array_keys($result);
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}
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/**
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* list all constraints in a table
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*
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* @param string $table name of table that should be used in method
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* @return mixed data array on success, a PEAR error on failure
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* @access public
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*/
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function listTableConstraints($table)
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{
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$subquery = "SELECT indexrelid FROM pg_index, pg_class";
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$subquery.= " WHERE pg_class.relname='$table' AND pg_class.oid=pg_index.indrelid AND (indisunique = 't' OR indisprimary = 't')";
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$query = "SELECT relname FROM pg_class WHERE oid IN ($subquery)";
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$constraints = $this->_db->getCol($query);
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if (PEAR::isError($constraints)) {
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return $constraints;
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}
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$result = array();
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foreach ($constraints as $constraint) {
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$result[$constraint] = true;
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}
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$result = array_change_key_case($result, CASE_LOWER);
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return array_keys($result);
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}
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/**
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* get the structure of an index into an array
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*
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* @param string $table name of table that should be used in method
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* @param string $index_name name of index that should be used in method
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* @return mixed data array on success, a PEAR error on failure
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* @access public
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*/
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function getTableIndexDefinition($table, $index_name)
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{
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$query = "SELECT relname, indkey FROM pg_index, pg_class
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WHERE pg_class.relname = ".$this->_db->quoteSmart($index_name)." AND pg_class.oid = pg_index.indexrelid
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AND indisunique != 't' AND indisprimary != 't'";
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$row = $this->_db->getRow($query, null, DB_FETCHMODE_ASSOC);
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if (PEAR::isError($row)) {
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return $row;
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}
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$columns = $this->_listTableFields($table);
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$definition = array();
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$index_column_numbers = explode(' ', $row['indkey']);
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foreach ($index_column_numbers as $number) {
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$definition['fields'][$columns[($number - 1)]] = array('sorting' => 'ascending');
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}
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return $definition;
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}
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/**
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* get the structure of a constraint into an array
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*
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* @param string $table name of table that should be used in method
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* @param string $index_name name of index that should be used in method
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* @return mixed data array on success, a PEAR error on failure
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* @access public
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*/
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function getTableConstraintDefinition($table, $index_name)
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{
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$query = "SELECT relname, indisunique, indisprimary, indkey FROM pg_index, pg_class
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WHERE pg_class.relname = ".$this->_db->quoteSmart($index_name)." AND pg_class.oid = pg_index.indexrelid
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AND (indisunique = 't' OR indisprimary = 't')";
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$row = $this->_db->getRow($query, null, DB_FETCHMODE_ASSOC);
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if (PEAR::isError($row)) {
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return $row;
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}
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$columns = $this->_listTableFields($table);
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$definition = array();
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if ($row['indisprimary'] == 't') {
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$definition['primary'] = true;
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} elseif ($row['indisunique'] == 't') {
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$definition['unique'] = true;
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}
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$index_column_numbers = explode(' ', $row['indkey']);
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foreach ($index_column_numbers as $number) {
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$definition['fields'][$columns[($number - 1)]] = array('sorting' => 'ascending');
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}
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return $definition;
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}
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/**
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* list all fields in a tables in the current database
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*
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* @param string $table name of table that should be used in method
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* @return mixed data array on success, a PEAR error on failure
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* @access private
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*/
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function _listTableFields($table)
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{
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$table = $this->_db->quoteIdentifier($table);
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$result2 = $this->_db->query("SELECT * FROM $table");
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if (PEAR::isError($result2)) {
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return $result2;
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}
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$columns = array();
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$numcols = $result2->numCols();
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for ($column = 0; $column < $numcols; $column++) {
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$column_name = @pg_field_name($result2->result, $column);
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$columns[$column_name] = $column;
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}
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$result2->free();
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return array_flip($columns);
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}
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/**
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* drop existing index
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*
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* @param string $table name of table that should be used in method
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* @param string $name name of the index to be dropped
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* @return mixed DB_OK on success, a PEAR error on failure
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* @access public
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*/
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function dropIndex($table, $name)
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{
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$name = $this->_db->quoteIdentifier($name);
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return $this->_db->query("DROP INDEX $name");
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}
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/**
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* drop existing constraint
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*
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* @param string $table name of table that should be used in method
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* @param string $name name of the constraint to be dropped
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* @return mixed DB_OK on success, a PEAR error on failure
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* @access public
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*/
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function dropConstraint($table, $name)
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{
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$table = $this->_db->quoteIdentifier($table);
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$name = $this->_db->quoteIdentifier($name);
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return $this->_db->query("ALTER TABLE $table DROP CONSTRAINT $name");
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}
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/**
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* alter an existing table
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*
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* @param string $name name of the table that is intended to be changed.
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* @param array $changes associative array that contains the details of each type
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* of change that is intended to be performed. The types of
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* changes that are currently supported are defined as follows:
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*
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* name
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*
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* New name for the table.
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*
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* add
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*
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* Associative array with the names of fields to be added as
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* indexes of the array. The value of each entry of the array
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* should be set to another associative array with the properties
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* of the fields to be added. The properties of the fields should
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* be the same as defined by the Metabase parser.
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*
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*
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* remove
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*
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* Associative array with the names of fields to be removed as indexes
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* of the array. Currently the values assigned to each entry are ignored.
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* An empty array should be used for future compatibility.
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*
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* rename
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*
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* Associative array with the names of fields to be renamed as indexes
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* of the array. The value of each entry of the array should be set to
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* another associative array with the entry named name with the new
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* field name and the entry named Declaration that is expected to contain
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* the portion of the field declaration already in DBMS specific SQL code
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* as it is used in the CREATE TABLE statement.
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*
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* change
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*
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* Associative array with the names of the fields to be changed as indexes
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* of the array. Keep in mind that if it is intended to change either the
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* name of a field and any other properties, the change array entries
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* should have the new names of the fields as array indexes.
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*
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* The value of each entry of the array should be set to another associative
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* array with the properties of the fields to that are meant to be changed as
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* array entries. These entries should be assigned to the new values of the
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* respective properties. The properties of the fields should be the same
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* as defined by the Metabase parser.
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*
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* Example
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* array(
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* 'name' => 'userlist',
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* 'add' => array(
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* 'quota' => array(
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* 'type' => 'integer',
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* 'unsigned' => 1
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* )
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* ),
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* 'remove' => array(
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* 'file_limit' => array(),
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* 'time_limit' => array()
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* ),
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* 'change' => array(
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* 'name' => array(
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* 'length' => '20',
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* 'definition' => array(
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* 'type' => 'text',
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* 'length' => 20,
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* ),
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* )
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* ),
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* 'rename' => array(
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* 'sex' => array(
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* 'name' => 'gender',
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* 'definition' => array(
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* 'type' => 'text',
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* 'length' => 1,
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* 'default' => 'M',
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* ),
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* )
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* )
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* )
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*
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* @param boolean $check (ignored in DB_Table)
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* @access public
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*
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* @return mixed DB_OK on success, a PEAR error on failure
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*/
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function alterTable($name, $changes, $check)
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{
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foreach ($changes as $change_name => $change) {
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switch ($change_name) {
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case 'add':
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case 'remove':
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case 'change':
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case 'name':
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case 'rename':
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break;
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default:
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return DB_Table::throwError(DB_TABLE_ERR_ALTER_TABLE_IMPOS);
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}
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}
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if (array_key_exists('add', $changes)) {
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foreach ($changes['add'] as $field_name => $field) {
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$query = 'ADD ' . $field_name . ' ' . $field;
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$result = $this->_db->query("ALTER TABLE $name $query");
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if (PEAR::isError($result)) {
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return $result;
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}
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}
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}
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if (array_key_exists('remove', $changes)) {
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foreach ($changes['remove'] as $field_name => $field) {
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$field_name = $this->_db->quoteIdentifier($field_name);
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$query = 'DROP ' . $field_name;
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$result = $this->_db->query("ALTER TABLE $name $query");
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if (PEAR::isError($result)) {
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return $result;
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}
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}
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}
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if (array_key_exists('change', $changes)) {
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foreach ($changes['change'] as $field_name => $field) {
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$field_name = $this->_db->quoteIdentifier($field_name);
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if (array_key_exists('type', $field)) {
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$query = "ALTER $field_name TYPE " . $field['definition'];
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$result = $this->_db->query("ALTER TABLE $name $query");
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if (PEAR::isError($result)) {
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return $result;
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}
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}
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/* default / notnull changes not (yet) supported in DB_Table
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if (array_key_exists('default', $field)) {
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$query = "ALTER $field_name SET DEFAULT ".$db->quote($field['definition']['default'], $field['definition']['type']);
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$result = $db->exec("ALTER TABLE $name $query");
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if (PEAR::isError($result)) {
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return $result;
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}
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}
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if (array_key_exists('notnull', $field)) {
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$query.= "ALTER $field_name ".($field['definition']['notnull'] ? "SET" : "DROP").' NOT NULL';
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$result = $db->exec("ALTER TABLE $name $query");
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if (PEAR::isError($result)) {
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return $result;
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}
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}
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*/
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}
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}
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if (array_key_exists('rename', $changes)) {
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foreach ($changes['rename'] as $field_name => $field) {
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$field_name = $this->_db->quoteIdentifier($field_name);
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$result = $this->_db->query("ALTER TABLE $name RENAME COLUMN $field_name TO ".$this->_db->quoteIdentifier($field['name']));
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if (PEAR::isError($result)) {
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return $result;
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}
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}
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}
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$name = $this->_db->quoteIdentifier($name);
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if (array_key_exists('name', $changes)) {
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$change_name = $this->_db->quoteIdentifier($changes['name']);
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$result = $this->_db->query("ALTER TABLE $name RENAME TO ".$change_name);
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if (PEAR::isError($result)) {
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return $result;
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}
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}
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return DB_OK;
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}
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}
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?>
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