File Source for compare

<?php // $Id: compare_db.php 10527 2006-12-19 11:01:20Z yannoo $
/*
==============================================================================
Dokeos - elearning and course management software
Copyright (c) 2006 Yannick Warnier <yannick.warnier@dokeos.com>
Copyright (c) 2004 Dokeos S.A.
Copyright (c) 2003 Ghent University (UGent)
Copyright (c) 2001 Universite catholique de Louvain (UCL)
For a full list of contributors, see "credits.txt".
The full license can be read in "license.txt".
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
See the GNU General Public License for more details.
Contact address: Dokeos, 44 rue des palais, B-1030 Brussels, Belgium
Mail: info@dokeos.com
==============================================================================
*/
/**
==============================================================================
* This script allows you to know which tables have been modified
* between two versions of Dokeos databases.
*
* @package dokeos.install
==============================================================================
*/
/**
* Database configuration
* INSTRUCTIONS
* ============
* Change these parameters to compare between an old and a new database install.
* You will need to create a course called 'COURSE' on each side to be able to compare the
* courses databases.
* If you have given fancy names to your databases, you will need to modify these names
* in the two $bases_* variables definitions below.
* Also, make sure about the prefix possibly used in front of the normal prefix for courses
* databases (i.e. 'zPrefix_course' contains 'z' as additional prefix).
*/
$sql_server_new='localhost';
$sql_user_new='root';
$sql_pass_new='';
$prefix_new = 'dokeos180_';
$bases_new=array($prefix_new.'dokeos_main',$prefix_new.'dokeos_stats',$prefix_new.'dokeos_user','z'.$prefix_new.'COURSE',$prefix_new.'dokeos_scorm');
$db_new = mysql_connect($sql_server_new,$sql_user_new,$sql_pass_new) or die(mysql_error());
$sql_server_old='localhost';
$sql_user_old='root';
$sql_pass_old='';
$prefix_old = 'dokeos160_';
$bases_old=array($prefix_old.'dokeos_main',$prefix_old.'dokeos_stats',$prefix_old.'dokeos_user',$prefix_old.'COURSE',$prefix_old.'dokeos_scorm');
$db_old = mysql_connect($sql_server_old,$sql_user_old,$sql_pass_old) or die(mysql_error());
$field_details = array(0=>'Field',1=>'Type',2=>'Null',3=>'Key',4=>'Default',5=>'Extra');
/********************************/
$all_db_changes = array();
echo "<h1>Databases structure comparison script</h1>";
//iterate through databases given above (checking from the 'new' database side)
foreach($bases_new as $num_base=>$base)
{
//init tables lists for this database
$modif_tables=array();
$tables_db_new=array();
$tables_db_old=array();
$dump=array();
//display current processed database
echo "<h2>Now analysing differences between databases <em>$base</em> and <em>".$bases_old[$num_base]."</em></h2>";
//get a list of tables for this database
$query_new="SHOW TABLES FROM ".$bases_new[$num_base];
$result_new=mysql_query($query_new,$db_new);
if($result_new) //if there are tables in this database
{
$i=0;
//as there are tables, process them one by one
while($row_new=mysql_fetch_row($result_new))
{
$dump[$i]['table_name']=$row_new[0];
$dump[$i]['fields']=array();
$query_old="SHOW FIELDS FROM ".$bases_new[$num_base].".".$row_new[0];
$result_old=mysql_query($query_old,$db_old) or die(mysql_error());
$j=0;
//get the fields details (numbered fields)
while($row_old=mysql_fetch_row($result_old))
{
$dump[$i]['fields'][$j][0]=$row_old[0];
$dump[$i]['fields'][$j][1]=$row_old[1];
$dump[$i]['fields'][$j][2]=$row_old[2];
$dump[$i]['fields'][$j][3]=$row_old[3];
$dump[$i]['fields'][$j][4]=$row_old[4];
$dump[$i]['fields'][$j][5]=$row_old[5];
//get the field name in one special element of this array
$dump[$i]['field_names'][$row_old[0]]=$j;
$j++;
}
$i++;
}
foreach($dump as $table)
{
$query="SHOW FIELDS FROM ".$bases_old[$num_base].".".$table['table_name'];
$result=mysql_query($query,$db_old);
if(!$result)
{
$modif_tables[]='**'.$table['table_name'].'**';
}
else
{
$i=0;
//check for removed, new or modified fields
$fields_old = array();
$fields_new = array();
//list the new fields in a enumeration array
foreach($table['field_names'] as $dummy_key=>$dummy_field){
$fields_new[] = $dummy_key;
}
//list the old fields in an enumeration array and check if their corresponding
//field in the new table is different (if any)
$modif_fields = array();
while($row_old = mysql_fetch_row($result)){
$fields_old[] = $row_old[0];
$modif_field = '';
if(isset($table['fields'][$table['field_names'][$row_old[0]]])){
$field_infos=$table['fields'][$table['field_names'][$row_old[0]]];
foreach($row_old as $key=>$enreg)
{
//if the old field information of this kind doesn't match the new, record it
if($row_old[$key] != $field_infos[$key])
{
$modif_field .='~+~'.$field_details[$key].'~+~,';
break;
}
}
//only record the whole stuff if the string is not empty
if(strlen($modif_field)>0){
$modif_fields[$row_old[0]] .= substr($modif_field,0,-1);
}
}
}
$new_fields = array_diff($fields_new,$fields_old);
foreach($new_fields as $dummy=>$val){
$new_fields[$dummy] = '++'.$val.'++';
}
$old_fields = array_diff($fields_old,$fields_new);
foreach($old_fields as $dummy=>$val){
$old_fields[$dummy] = '--'.$val.'--';
}
if(count($old_fields)>0 or count($modif_fields)>0 or count($new_fields)>0 ){
$modif_tables[]=array(
'table'=>$table['table_name'],
'old_fields'=>$old_fields,
'changed_fields'=>$modif_fields,
'new_fields'=>$new_fields,
);
}
}
$tables_db_new[]=$table['table_name'];
}
$query="SHOW TABLES FROM ".$bases_old[$num_base];
$result=mysql_query($query,$db_old) or die(mysql_error());
while($row=mysql_fetch_row($result))
{
$tables_db_old[]=$row[0];
}
$diff=array_diff($tables_db_old,$tables_db_new);
foreach($diff as $enreg)
{
$modif_tables[]='---'.$enreg.'---';
}
//$modif_tables=array_unique($modif_tables); //deprecated with the structure complexification
}else{ //this database was removed in the new version
$query="SHOW TABLES FROM ".$bases_old[$num_base];
$result=mysql_query($query,$db_old) or die(mysql_error());
while($row=mysql_fetch_row($result))
{
$tables_db_old[]=$row[0];
}
$diff=array_diff($tables_db_old,$tables_db_new);
foreach($diff as $enreg)
{
$modif_tables[]='---'.$enreg.'---';
}
$modif_tables=array_unique($modif_tables);
echo "<h3>This database has been removed!</h3>";
}
echo "<h3>Differences between each table</h3>" .
"- fields display under each table's name, <br>" .
"- new tables are surrounded by '**', <br/>" .
"- removed tables are surrounded by '---',<br/>" .
"- new fields are surrounded by '++',<br/>" .
"- removed fields are surrounded by '--',<br/>" .
"- modified fields are surrounded by '~+~',<br/>";
echo '<pre>'.print_r($modif_tables,true).'</pre>';
$all_db_changes[$base] = $modif_tables;
}
mysql_close($db_new);
mysql_close($db_old);
echo "<h2>Generating SQL</h2>";
//going through all databases changes
foreach($all_db_changes as $base => $changes){
echo "<h3>SQL for DB $base</h3>";
foreach($changes as $table){
if(is_array($table)){
//we have a field-level difference
$mytable = $table['table'];
$myold = $table['old_fields'];
$mychanged = $table['changed_fields'];
$mynew = $table['new_fields'];
foreach($myold as $myname){
//column lost, display DROP command
$myname = str_replace('--','',$myname);
echo "ALTER TABLE ".$mytable." DROP ".$myname."<br/>";
}
foreach($mychanged as $myname=>$myprop){
//field changed, display SET command
$myprops = split(',',$myprop);
$myprops_string = '';
foreach($myprops as $myprop){
$myprop = str_replace('~+~','',$myprop);
$myprops_string .= $myprop." ";
}
echo "ALTER TABLE ".$mytable." CHANGE $myname $myname $myprops_string<br/>";
}
foreach($mynew as $myname){
//column created, display ADD command
$myname = str_replace('++','',$myname);
echo "ALTER TABLE ".$mytable." ADD $myname...<br/>";
}
}else{
//we have a table-level difference
$open_tag = substr($table,0,2);
switch($open_tag){
case '**':
//new table, display CREATE TABLE command
$table = str_replace('**','',$table);
echo "CREATE TABLE ".$table."();<br/>";
break;
case '--':
//dropped table, display DROP TABLE command
$table = str_replace('---','',$table);
echo "DROP TABLE ".$table."();<br/>";
break;
default:
echo "Unknown table problem: ".$table."<br/>";
break;
}
}
}
}
?>

Source for file compare_db.php