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265 lines
8.4 KiB
265 lines
8.4 KiB
<?php // $Id: compare_db.php 22577 2009-08-03 04:31:24Z yannoo $
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/* For licensing terms, see /dokeos_license.txt */
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/**
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==============================================================================
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* This script allows you to know which tables have been modified
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* between two versions of Dokeos databases.
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*
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* @package dokeos.install
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==============================================================================
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*/
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/**
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* Database configuration
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* INSTRUCTIONS
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* ============
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* Change these parameters to compare between an old and a new database install.
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* You will need to create a course called 'COURSE' on each side to be able to compare the
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* courses databases.
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* If you have given fancy names to your databases, you will need to modify these names
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* in the two $bases_* variables definitions below.
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* Also, make sure about the prefix possibly used in front of the normal prefix for courses
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* databases (i.e. 'zPrefix_course' contains 'z' as additional prefix).
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*/
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$sql_server_new='localhost';
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$sql_user_new='root';
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$sql_pass_new='';
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$prefix_new = 'dokeos180_';
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$bases_new=array($prefix_new.'dokeos_main',$prefix_new.'dokeos_stats',$prefix_new.'dokeos_user','z'.$prefix_new.'COURSE',$prefix_new.'dokeos_scorm');
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$db_new = mysql_connect($sql_server_new,$sql_user_new,$sql_pass_new) or die(mysql_error());
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// The system has not been designed to use special SQL modes that were introduced since MySQL 5
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@mysql_query("set session sql_mode='';", $db_new);
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$sql_server_old='localhost';
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$sql_user_old='root';
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$sql_pass_old='';
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$prefix_old = 'dokeos160_';
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$bases_old=array($prefix_old.'dokeos_main',$prefix_old.'dokeos_stats',$prefix_old.'dokeos_user',$prefix_old.'COURSE',$prefix_old.'dokeos_scorm');
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$db_old = mysql_connect($sql_server_old,$sql_user_old,$sql_pass_old) or die(mysql_error());
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// The system has not been designed to use special SQL modes that were introduced since MySQL 5
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@mysql_query("set session sql_mode='';", $db_old);
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$field_details = array(0=>'Field',1=>'Type',2=>'Null',3=>'Key',4=>'Default',5=>'Extra');
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/********************************/
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$all_db_changes = array();
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echo "<h1>Databases structure comparison script</h1>";
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//iterate through databases given above (checking from the 'new' database side)
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foreach($bases_new as $num_base=>$base)
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{
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//init tables lists for this database
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$modif_tables=array();
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$tables_db_new=array();
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$tables_db_old=array();
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$dump=array();
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//display current processed database
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echo "<h2>Now analysing differences between databases <em>$base</em> and <em>".$bases_old[$num_base]."</em></h2>";
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//get a list of tables for this database
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$query_new="SHOW TABLES FROM ".$bases_new[$num_base];
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$result_new=mysql_query($query_new,$db_new);
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if($result_new) //if there are tables in this database
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{
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$i=0;
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//as there are tables, process them one by one
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while($row_new=mysql_fetch_row($result_new))
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{
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$dump[$i]['table_name']=$row_new[0];
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$dump[$i]['fields']=array();
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$query_old="SHOW FIELDS FROM ".$bases_new[$num_base].".".$row_new[0];
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$result_old=mysql_query($query_old,$db_old) or die(mysql_error());
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$j=0;
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//get the fields details (numbered fields)
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while($row_old=mysql_fetch_row($result_old))
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{
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$dump[$i]['fields'][$j][0]=$row_old[0];
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$dump[$i]['fields'][$j][1]=$row_old[1];
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$dump[$i]['fields'][$j][2]=$row_old[2];
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$dump[$i]['fields'][$j][3]=$row_old[3];
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$dump[$i]['fields'][$j][4]=$row_old[4];
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$dump[$i]['fields'][$j][5]=$row_old[5];
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//get the field name in one special element of this array
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$dump[$i]['field_names'][$row_old[0]]=$j;
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$j++;
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}
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$i++;
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}
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foreach($dump as $table)
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{
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$query="SHOW FIELDS FROM ".$bases_old[$num_base].".".$table['table_name'];
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$result=mysql_query($query,$db_old);
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if(!$result)
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{
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$modif_tables[]='**'.$table['table_name'].'**';
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}
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else
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{
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$i=0;
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//check for removed, new or modified fields
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$fields_old = array();
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$fields_new = array();
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//list the new fields in a enumeration array
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foreach($table['field_names'] as $dummy_key=>$dummy_field){
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$fields_new[] = $dummy_key;
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}
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//list the old fields in an enumeration array and check if their corresponding
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//field in the new table is different (if any)
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$modif_fields = array();
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while($row_old = mysql_fetch_row($result)){
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$fields_old[] = $row_old[0];
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$modif_field = '';
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if(isset($table['fields'][$table['field_names'][$row_old[0]]])){
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$field_infos=$table['fields'][$table['field_names'][$row_old[0]]];
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foreach($row_old as $key=>$enreg)
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{
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//if the old field information of this kind doesn't match the new, record it
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if($row_old[$key] != $field_infos[$key])
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{
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$modif_field .='~+~'.$field_details[$key].'~+~,';
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break;
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}
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}
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//only record the whole stuff if the string is not empty
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if(strlen($modif_field)>0){
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$modif_fields[$row_old[0]] .= substr($modif_field,0,-1);
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}
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}
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}
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$new_fields = array_diff($fields_new,$fields_old);
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foreach($new_fields as $dummy=>$val){
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$new_fields[$dummy] = '++'.$val.'++';
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}
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$old_fields = array_diff($fields_old,$fields_new);
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foreach($old_fields as $dummy=>$val){
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$old_fields[$dummy] = '--'.$val.'--';
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}
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if(count($old_fields)>0 or count($modif_fields)>0 or count($new_fields)>0 ){
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$modif_tables[]=array(
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'table'=>$table['table_name'],
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'old_fields'=>$old_fields,
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'changed_fields'=>$modif_fields,
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'new_fields'=>$new_fields,
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);
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}
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}
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$tables_db_new[]=$table['table_name'];
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}
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$query="SHOW TABLES FROM ".$bases_old[$num_base];
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$result=mysql_query($query,$db_old) or die(mysql_error());
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while($row=mysql_fetch_row($result))
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{
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$tables_db_old[]=$row[0];
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}
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$diff=array_diff($tables_db_old,$tables_db_new);
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foreach($diff as $enreg)
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{
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$modif_tables[]='---'.$enreg.'---';
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}
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//$modif_tables=array_unique($modif_tables); //deprecated with the structure complexification
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}else{ //this database was removed in the new version
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$query="SHOW TABLES FROM ".$bases_old[$num_base];
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$result=mysql_query($query,$db_old) or die(mysql_error());
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while($row=mysql_fetch_row($result))
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{
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$tables_db_old[]=$row[0];
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}
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$diff=array_diff($tables_db_old,$tables_db_new);
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foreach($diff as $enreg)
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{
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$modif_tables[]='---'.$enreg.'---';
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}
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$modif_tables=array_unique($modif_tables);
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echo "<h3>This database has been removed!</h3>";
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}
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echo "<h3>Differences between each table</h3>" .
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"- fields display under each table's name, <br />" .
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"- new tables are surrounded by '**', <br />" .
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"- removed tables are surrounded by '---',<br />" .
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"- new fields are surrounded by '++',<br />" .
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"- removed fields are surrounded by '--',<br />" .
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"- modified fields are surrounded by '~+~',<br />";
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echo '<pre>'.print_r($modif_tables,true).'</pre>';
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$all_db_changes[$base] = $modif_tables;
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}
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mysql_close($db_new);
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mysql_close($db_old);
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echo "<h2>Generating SQL</h2>";
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//going through all databases changes
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foreach($all_db_changes as $base => $changes){
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echo "<h3>SQL for DB $base</h3>";
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foreach($changes as $table){
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if(is_array($table)){
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//we have a field-level difference
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$mytable = $table['table'];
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$myold = $table['old_fields'];
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$mychanged = $table['changed_fields'];
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$mynew = $table['new_fields'];
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foreach($myold as $myname){
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//column lost, display DROP command
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$myname = str_replace('--','',$myname);
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echo "ALTER TABLE ".$mytable." DROP ".$myname."<br />";
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}
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foreach($mychanged as $myname=>$myprop){
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//field changed, display SET command
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$myprops = split(',',$myprop);
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$myprops_string = '';
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foreach($myprops as $myprop){
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$myprop = str_replace('~+~','',$myprop);
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$myprops_string .= $myprop." ";
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}
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echo "ALTER TABLE ".$mytable." CHANGE $myname $myname $myprops_string<br />";
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}
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foreach($mynew as $myname){
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//column created, display ADD command
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$myname = str_replace('++','',$myname);
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echo "ALTER TABLE ".$mytable." ADD $myname...<br />";
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}
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}else{
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//we have a table-level difference
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$open_tag = substr($table,0,2);
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switch($open_tag){
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case '**':
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//new table, display CREATE TABLE command
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$table = str_replace('**','',$table);
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echo "CREATE TABLE ".$table."();<br />";
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break;
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case '--':
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//dropped table, display DROP TABLE command
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$table = str_replace('---','',$table);
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echo "DROP TABLE ".$table."();<br />";
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break;
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default:
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echo "Unknown table problem: ".$table."<br />";
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break;
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}
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}
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}
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}
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?>
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