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7253d30810
name og any key in the DB. This hasn't too much sense for now (until we start to use referencial integrity) and it is far from perfect, because it doesn't seach for the key really in DB (due to the lack of support for this of ADOdb).
580 lines
22 KiB
PHP
580 lines
22 KiB
PHP
<?php // $Id$
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///////////////////////////////////////////////////////////////////////////
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// //
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// NOTICE OF COPYRIGHT //
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// //
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// Moodle - Modular Object-Oriented Dynamic Learning Environment //
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// http://moodle.com //
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// //
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// Copyright (C) 2001-3001 Martin Dougiamas http://dougiamas.com //
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// (C) 2001-3001 Eloy Lafuente (stronk7) http://contiento.com //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation; either version 2 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details: //
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// //
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// http://www.gnu.org/copyleft/gpl.html //
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// //
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///////////////////////////////////////////////////////////////////////////
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// This library includes all the required functions used to handle the DB
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// structure (DDL) independently of the underlying RDBMS in use. All the functions
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// rely on the XMLDBDriver classes to be able to generate the correct SQL
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// syntax needed by each DB.
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//
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// To define any structure to be created we'll use the schema defined
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// by the XMLDB classes, for tables, fields, indexes, keys and other
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// statements instead of direct handling of SQL sentences.
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//
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// This library should be used, exclusively, by the installation and
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// upgrade process of Moodle.
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//
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// For further documentation, visit http://docs.moodle.org/en/DDL_functions
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/// Add required XMLDB constants
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require_once($CFG->libdir . '/xmldb/classes/XMLDBConstants.php');
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/// Add main XMLDB Generator
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require_once($CFG->libdir . '/xmldb/classes/generators/XMLDBGenerator.class.php');
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/// Add required XMLDB DB classes
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require_once($CFG->libdir . '/xmldb/classes/XMLDBObject.class.php');
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require_once($CFG->libdir . '/xmldb/classes/XMLDBFile.class.php');
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require_once($CFG->libdir . '/xmldb/classes/XMLDBStructure.class.php');
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require_once($CFG->libdir . '/xmldb/classes/XMLDBTable.class.php');
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require_once($CFG->libdir . '/xmldb/classes/XMLDBField.class.php');
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require_once($CFG->libdir . '/xmldb/classes/XMLDBKey.class.php');
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require_once($CFG->libdir . '/xmldb/classes/XMLDBIndex.class.php');
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require_once($CFG->libdir . '/xmldb/classes/XMLDBStatement.class.php');
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/// Based on $CFG->dbtype, add the proper generator class
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require_once($CFG->libdir . '/xmldb/classes/generators/' . $CFG->dbtype . '/' . $CFG->dbtype . '.class.php');
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/// Add other libraries
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require_once($CFG->libdir . '/xmlize.php');
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/**
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* Add a new field to a table, or modify an existing one (if oldfield is defined).
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* Warning: Please be careful on primary keys, as this function will eat auto_increments
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*
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* @uses $CFG
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* @uses $db
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* @param string $table the name of the table to modify. (Without the prefix.)
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* @param string $oldfield If changing an existing column, the name of that column.
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* @param string $field The name of the column at the end of the operation.
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* @param string $type The type of the column at the end of the operation. TEXT, VARCHAR, CHAR, INTEGER, REAL, or TINYINT
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* @param string $size The size of that column type. As in VARCHAR($size), or INTEGER($size).
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* @param string $signed For numeric column types, whether that column is 'signed' or 'unsigned'.
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* @param string $default The new default value for the column.
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* @param string $null 'not null', or '' to allow nulls.
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* @param string $after Which column to insert this one after. Not supported on Postgres.
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*
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* @return boolean Wheter the operation succeeded.
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*/
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function table_column($table, $oldfield, $field, $type='integer', $size='10',
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$signed='unsigned', $default='0', $null='not null', $after='') {
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global $CFG, $db, $empty_rs_cache;
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if (!empty($empty_rs_cache[$table])) { // Clear the recordset cache because it's out of date
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unset($empty_rs_cache[$table]);
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}
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switch (strtolower($CFG->dbtype)) {
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case 'mysql':
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case 'mysqlt':
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switch (strtolower($type)) {
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case 'text':
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$type = 'TEXT';
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$signed = '';
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break;
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case 'integer':
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$type = 'INTEGER('. $size .')';
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break;
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case 'varchar':
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$type = 'VARCHAR('. $size .')';
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$signed = '';
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break;
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case 'char':
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$type = 'CHAR('. $size .')';
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$signed = '';
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break;
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}
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if (!empty($oldfield)) {
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$operation = 'CHANGE '. $oldfield .' '. $field;
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} else {
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$operation = 'ADD '. $field;
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}
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$default = 'DEFAULT \''. $default .'\'';
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if (!empty($after)) {
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$after = 'AFTER `'. $after .'`';
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}
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return execute_sql('ALTER TABLE '. $CFG->prefix . $table .' '. $operation .' '. $type .' '. $signed .' '. $default .' '. $null .' '. $after);
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case 'postgres7': // From Petri Asikainen
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//Check db-version
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$dbinfo = $db->ServerInfo();
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$dbver = substr($dbinfo['version'],0,3);
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//to prevent conflicts with reserved words
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$realfield = '"'. $field .'"';
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$field = '"'. $field .'_alter_column_tmp"';
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$oldfield = '"'. $oldfield .'"';
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switch (strtolower($type)) {
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case 'tinyint':
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case 'integer':
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if ($size <= 4) {
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$type = 'INT2';
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}
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if ($size <= 10) {
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$type = 'INT';
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}
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if ($size > 10) {
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$type = 'INT8';
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}
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break;
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case 'varchar':
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$type = 'VARCHAR('. $size .')';
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break;
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case 'char':
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$type = 'CHAR('. $size .')';
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$signed = '';
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break;
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}
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$default = '\''. $default .'\'';
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//After is not implemented in postgesql
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//if (!empty($after)) {
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// $after = "AFTER '$after'";
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//}
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//Use transactions
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execute_sql('BEGIN');
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//Always use temporary column
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execute_sql('ALTER TABLE '. $CFG->prefix . $table .' ADD COLUMN '. $field .' '. $type);
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//Add default values
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execute_sql('UPDATE '. $CFG->prefix . $table .' SET '. $field .'='. $default);
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if ($dbver >= '7.3') {
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// modifying 'not null' is posible before 7.3
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//update default values to table
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if (strtoupper($null) == 'NOT NULL') {
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execute_sql('UPDATE '. $CFG->prefix . $table .' SET '. $field .'='. $default .' WHERE '. $field .' IS NULL');
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execute_sql('ALTER TABLE '. $CFG->prefix . $table .' ALTER COLUMN '. $field .' SET '. $null);
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} else {
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execute_sql('ALTER TABLE '. $CFG->prefix . $table .' ALTER COLUMN '. $field .' DROP NOT NULL');
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}
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}
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execute_sql('ALTER TABLE '. $CFG->prefix . $table .' ALTER COLUMN '. $field .' SET DEFAULT '. $default);
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if ( $oldfield != '""' ) {
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// We are changing the type of a column. This may require doing some casts...
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$casting = '';
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$oldtype = column_type($table, $oldfield);
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$newtype = column_type($table, $field);
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// Do we need a cast?
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if($newtype == 'N' && $oldtype == 'C') {
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$casting = 'CAST(CAST('.$oldfield.' AS TEXT) AS REAL)';
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}
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else if($newtype == 'I' && $oldtype == 'C') {
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$casting = 'CAST(CAST('.$oldfield.' AS TEXT) AS INTEGER)';
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}
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else {
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$casting = $oldfield;
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}
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// Run the update query, casting as necessary
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execute_sql('UPDATE '. $CFG->prefix . $table .' SET '. $field .' = '. $casting);
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execute_sql('ALTER TABLE '. $CFG->prefix . $table .' DROP COLUMN '. $oldfield);
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}
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execute_sql('ALTER TABLE '. $CFG->prefix . $table .' RENAME COLUMN '. $field .' TO '. $realfield);
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return execute_sql('COMMIT');
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default:
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switch (strtolower($type)) {
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case 'integer':
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$type = 'INTEGER';
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break;
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case 'varchar':
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$type = 'VARCHAR';
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break;
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}
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$default = 'DEFAULT \''. $default .'\'';
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if (!empty($after)) {
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$after = 'AFTER '. $after;
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}
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if (!empty($oldfield)) {
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execute_sql('ALTER TABLE '. $CFG->prefix . $table .' RENAME COLUMN '. $oldfield .' '. $field);
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} else {
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execute_sql('ALTER TABLE '. $CFG->prefix . $table .' ADD COLUMN '. $field .' '. $type);
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}
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execute_sql('ALTER TABLE '. $CFG->prefix . $table .' ALTER COLUMN '. $field .' SET '. $null);
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return execute_sql('ALTER TABLE '. $CFG->prefix . $table .' ALTER COLUMN '. $field .' SET '. $default);
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}
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}
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/**
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* This function IS NOT IMPLEMENTED. ONCE WE'LL BE USING RELATIONAL
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* INTEGRITY IT WILL BECOME MORE USEFUL. FOR NOW, JUST CALCULATE "OFFICIAL"
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* KEY NAMES WITHOUT ACCESSING TO DB AT ALL.
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* Given one XMLDBKey, the function returns the name of the key in DB (if exists)
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* of false if it doesn't exist
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*
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* @uses, $db
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* @param XMLDBTable the table to be searched
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* @param XMLDBKey the key to be searched
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* @return string key name of false
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*/
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function find_key_name($xmldb_table, $xmldb_key) {
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global $CFG, $db;
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/// Extract key columns
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$keycolumns = $xmldb_key->getFields();
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/// Get list of keys in table
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/// first primaries (we aren't going to use this now, because the MetaPrimaryKeys is awful)
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///TODO: To implement when we advance in relational integrity
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/// then uniques (note that Moodle, for now, shouldn't have any UNIQUE KEY for now, but unique indexes)
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///TODO: To implement when we advance in relational integrity (note that AdoDB hasn't any MetaXXX for this.
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/// then foreign (note that Moodle, for now, shouldn't have any FOREIGN KEY for now, but indexes)
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///TODO: To implement when we advance in relational integrity (note that AdoDB has one MetaForeignKeys()
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///but it's far from perfect.
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/// TODO: To create the proper functions inside each generator to retrieve all the needed KEY info (name
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/// columns, reftable and refcolumns
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/// So all we do is to return the official name of the requested key without any confirmation!)
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$classname = 'XMLDB' . $CFG->dbtype;
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$generator = new $classname();
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$generator->setPrefix($CFG->prefix);
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/// One exception, harcoded primary constraint names
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if ($generator->primary_key_name && $xmldb_key->getType() == XMLDB_KEY_PRIMARY) {
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return $generator->primary_key_name;
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} else {
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/// Calculate the name suffix
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switch ($xmldb_key->getType()) {
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case XMLDB_KEY_PRIMARY:
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$suffix = 'pk';
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break;
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case XMLDB_KEY_UNIQUE:
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$suffix = 'uk';
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break;
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case XMLDB_KEY_FOREIGN:
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$suffix = 'fk';
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break;
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}
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/// And simply, return the oficial name
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return $generator->getNameForObject($xmldb_table->getName(), implode(', ', $xmldb_key->getFields()), $suffix);
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}
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}
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/**
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* Given one XMLDBIndex, the function returns the name of the index in DB (if exists)
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* of false if it doesn't exist
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*
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* @uses, $db
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* @param XMLDBTable the table to be searched
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* @param XMLDBIndex the index to be searched
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* @return string index name of false
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*/
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function find_index_name($xmldb_table, $xmldb_index) {
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global $CFG, $db;
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/// Extract index columns
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$indcolumns = $xmldb_index->getFields();
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/// Get list of indexes in table
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$indexes = array_change_key_case($db->MetaIndexes($CFG->prefix . $xmldb_table->getName(), CASE_LOWER));
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/// Iterate over them looking for columns coincidence
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if ($indexes) {
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foreach ($indexes as $indexname => $index) {
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$columns = $index['columns'];
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/// Lower case column names
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$columns = array_flip($columns);
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$columns = array_change_key_case($columns, CASE_LOWER);
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$columns = array_flip($columns);
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/// Check if index matchs queried index
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$diferences = array_merge(array_diff($columns, $indcolumns), array_diff($indcolumns, $columns));
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/// If no diferences, we have find the index
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if (empty($diferences)) {
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return $indexname;
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}
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}
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}
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/// Arriving here, index not found
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return false;
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}
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/**
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* This function will load one entire XMLDB file, generating all the needed
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* SQL statements, specific for each RDBMS ($CFG->dbtype) and, finally, it
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* will execute all those statements against the DB.
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*
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* @uses $CFG, $db
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* @param $file full path to the XML file to be used
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* @return boolean (true on success, false on error)
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*/
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function install_from_xmldb_file($file) {
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global $CFG, $db;
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$status = true;
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$xmldb_file = new XMLDBFile($file);
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if (!$xmldb_file->fileExists()) {
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return false;
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}
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$loaded = $xmldb_file->loadXMLStructure();
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if (!$loaded || !$xmldb_file->isLoaded()) {
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return false;
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}
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$structure = $xmldb_file->getStructure();
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if (!$sqlarr = $structure->getCreateStructureSQL($CFG->dbtype, $CFG->prefix, false)) {
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return true; //Empty array = nothing to do = no error
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}
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return execute_sql_arr($sqlarr);
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}
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/**
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* This function will create the table passed as argument with all its
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* fields/keys/indexes/sequences, everything based in the XMLDB object
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*
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* @uses $CFG, $db
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* @param XMLDBTable table object (full specs are required)
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* @param boolean continue to specify if must continue on error (true) or stop (false)
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* @param boolean feedback to specify to show status info (true) or not (false)
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* @return boolean true on success, false on error
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*/
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function create_table($table, $continue=true, $feedback=true) {
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global $CFG, $db;
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$status = true;
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if (strtolower(get_class($table)) != 'xmldbtable') {
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return false;
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}
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if(!$sqlarr = $table->getCreateTableSQL($CFG->dbtype, $CFG->prefix, false)) {
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return true; //Empty array = nothing to do = no error
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}
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return execute_sql_arr($sqlarr, $continue, $feedback);
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}
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/**
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* This function will drop the table passed as argument
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* and all the associated objects (keys, indexes, constaints, sequences, triggers)
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* will be dropped too.
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*
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* @uses $CFG, $db
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* @param XMLDBTable table object (just the name is mandatory)
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* @param boolean continue to specify if must continue on error (true) or stop (false)
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* @param boolean feedback to specify to show status info (true) or not (false)
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* @return boolean true on success, false on error
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*/
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function drop_table($table, $continue=true, $feedback=true) {
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global $CFG, $db;
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$status = true;
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if (strtolower(get_class($table)) != 'xmldbtable') {
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return false;
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}
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if(!$sqlarr = $table->getDropTableSQL($CFG->dbtype, $CFG->prefix, false)) {
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return true; //Empty array = nothing to do = no error
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}
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return execute_sql_arr($sqlarr, $continue, $feedback);
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}
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/**
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* This function will add the field to the table passed as arguments
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*
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* @uses $CFG, $db
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* @param XMLDBTable table object (just the name is mandatory)
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* @param XMLDBField field object (full specs are required)
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* @param boolean continue to specify if must continue on error (true) or stop (false)
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* @param boolean feedback to specify to show status info (true) or not (false)
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* @return boolean true on success, false on error
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*/
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function add_field($table, $field, $continue=true, $feedback=true) {
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global $CFG, $db;
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$status = true;
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if (strtolower(get_class($table)) != 'xmldbtable') {
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return false;
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}
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if (strtolower(get_class($field)) != 'xmldbfield') {
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return false;
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}
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if(!$sqlarr = $table->getAddFieldSQL($CFG->dbtype, $CFG->prefix, $field, false)) {
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return true; //Empty array = nothing to do = no error
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}
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return execute_sql_arr($sqlarr, $continue, $feedback);
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}
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/**
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* This function will drop the field from the table passed as arguments
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*
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* @uses $CFG, $db
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* @param XMLDBTable table object (just the name is mandatory)
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* @param XMLDBField field object (just the name is mandatory)
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* @param boolean continue to specify if must continue on error (true) or stop (false)
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* @param boolean feedback to specify to show status info (true) or not (false)
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* @return boolean true on success, false on error
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*/
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function drop_field($table, $field, $continue=true, $feedback=true) {
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global $CFG, $db;
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$status = true;
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if (strtolower(get_class($table)) != 'xmldbtable') {
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return false;
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}
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if (strtolower(get_class($field)) != 'xmldbfield') {
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return false;
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}
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if(!$sqlarr = $table->getDropFieldSQL($CFG->dbtype, $CFG->prefix, $field, false)) {
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return true; //Empty array = nothing to do = no error
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}
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return execute_sql_arr($sqlarr, $continue, $feedback);
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}
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/**
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* This function will change the precision of the field in the table passed as arguments
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*
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* @uses $CFG, $db
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* @param XMLDBTable table object (just the name is mandatory)
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* @param XMLDBField field object (full specs are required)
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* @param boolean continue to specify if must continue on error (true) or stop (false)
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* @param boolean feedback to specify to show status info (true) or not (false)
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* @return boolean true on success, false on error
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*/
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function change_field_precision($table, $field, $continue=true, $feedback=true) {
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global $CFG, $db;
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$status = true;
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if (strtolower(get_class($table)) != 'xmldbtable') {
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return false;
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}
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if (strtolower(get_class($field)) != 'xmldbfield') {
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return false;
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}
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if(!$sqlarr = $table->getAlterFieldSQL($CFG->dbtype, $CFG->prefix, $field, false)) {
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return true; //Empty array = nothing to do = no error
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}
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return execute_sql_arr($sqlarr, $continue, $feedback);
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}
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/**
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* This function will change the unsigned/signed of the field in the table passed as arguments
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*
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* @uses $CFG, $db
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* @param XMLDBTable table object (just the name is mandatory)
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* @param XMLDBField field object (full specs are required)
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* @param boolean continue to specify if must continue on error (true) or stop (false)
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* @param boolean feedback to specify to show status info (true) or not (false)
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* @return boolean true on success, false on error
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*/
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function change_field_unsigned($table, $field, $continue=true, $feedback=true) {
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/// Just a wrapper over change_field_precision. Does exactly the same processing
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return change_field_precision($table, $field, $continue, $feedback);
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}
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/**
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* This function will change the nullability of the field in the table passed as arguments
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*
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* @uses $CFG, $db
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* @param XMLDBTable table object (just the name is mandatory)
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* @param XMLDBField field object (full specs are required)
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* @param boolean continue to specify if must continue on error (true) or stop (false)
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* @param boolean feedback to specify to show status info (true) or not (false)
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* @return boolean true on success, false on error
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*/
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function change_field_notnull($table, $field, $continue=true, $feedback=true) {
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/// Just a wrapper over change_field_precision. Does exactly the same processing
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return change_field_precision($table, $field, $continue, $feedback);
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}
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/**
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* This function will change the default of the field in the table passed as arguments
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* One null value in the default field means delete the default
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*
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* @uses $CFG, $db
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* @param XMLDBTable table object (just the name is mandatory)
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* @param XMLDBField field object (full specs are required)
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* @param boolean continue to specify if must continue on error (true) or stop (false)
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* @param boolean feedback to specify to show status info (true) or not (false)
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* @return boolean true on success, false on error
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*/
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function change_field_default($table, $field, $continue=true, $feedback=true) {
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global $CFG, $db;
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$status = true;
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if (strtolower(get_class($table)) != 'xmldbtable') {
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return false;
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}
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if (strtolower(get_class($field)) != 'xmldbfield') {
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return false;
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}
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if(!$sqlarr = $table->getModifyDefaultSQL($CFG->dbtype, $CFG->prefix, $field, false)) {
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return true; //Empty array = nothing to do = no error
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}
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return execute_sql_arr($sqlarr, $continue, $feedback);
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}
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?>
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