'Field', 1 => 'Type', 2 => 'Null', 3 => 'Key', 4 => 'Default', 5 => 'Extra');
/********************************/
$all_db_changes = array();
echo "Databases structure comparison script
";
// Iterate through databases given above (checking from the 'new' database side)
foreach ($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 "Now analysing differences between databases $base and ".$bases_old[$num_base]."
";
// 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_info = $table['fields'][$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] != $field_info[$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 "This database has been removed!
";
}
echo "Differences between each table
" .
"- fields display under each table's name,
" .
"- new tables are surrounded by '**',
" .
"- removed tables are surrounded by '---',
" .
"- new fields are surrounded by '++',
" .
"- removed fields are surrounded by '--',
" .
"- modified fields are surrounded by '~+~',
";
echo ''.print_r($modif_tables, true).'
';
$all_db_changes[$base] = $modif_tables;
}
mysql_close($db_new);
mysql_close($db_old);
echo "Generating SQL
";
//going through all databases changes
foreach ($all_db_changes as $base => $changes) {
echo "SQL for DB $base
";
foreach ($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 ".$myname."
";
}
foreach ($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 $myprops_string
";
}
foreach ($mynew as $myname) {
//column created, display ADD command
$myname = str_replace('++', '', $myname);
echo "ALTER TABLE ".$mytable." ADD $myname...
";
}
} 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."();
";
break;
case '--':
//dropped table, display DROP TABLE command
$table = str_replace('---', '', $table);
echo "DROP TABLE ".$table."();
";
break;
default:
echo "Unknown table problem: ".$table."
";
break;
}
}
}
}