config option to disable use of information_schema (if ok backport to QA_2_11)

libraries/config.default.php

@@ -312,6 +312,15 @@ $cfg['Servers'][$i]['AllowRoot'] = true;
  */
 $cfg['Servers'][$i]['AllowDeny']['order'] = '';
 
+/**
+ * Disable use of INFORMATION_SCHEMA
+ *
+ * @see http://sf.net/support/tracker.php?aid=1849494
+ * @see http://bugs.mysql.com/19588
+ * @global boolean $cfg['Servers'][$i]['DisableIS']
+ */
+$cfg['Servers'][$i]['DisableIS'] = true;
+
 /**
  * Host authentication rules, leave blank for defaults
  *

libraries/database_interface.lib.php

@@ -230,6 +230,7 @@ function PMA_DBI_get_tables_full($database, $table = false,
 
     $tables = array();
 
+    if (! $GLOBALS['cfg']['Server']['DisableIS']) {
       // get table information from information_schema
       if ($table) {
           if (true === $tbl_is_group) {
@@ -286,6 +287,7 @@ function PMA_DBI_get_tables_full($database, $table = false,
       $tables = PMA_DBI_fetch_result($sql, array('TABLE_SCHEMA', 'TABLE_NAME'),
           null, $link);
       unset($sql_where_table, $sql);
+    }
 
     // If permissions are wrong on even one database directory,
     // information_schema does not return any table info for any database
@@ -411,6 +413,7 @@ function PMA_DBI_get_databases_full($database = null, $force_stats = false,
 
     $apply_limit_and_order_manual = true;
 
+    if (! $GLOBALS['cfg']['Server']['DisableIS']) {
         /**
          * if $GLOBALS['cfg']['NaturalOrder'] is enabled, we cannot use LIMIT
          * cause MySQL does not support natural ordering, we have to do it afterward
@@ -485,6 +488,49 @@ function PMA_DBI_get_databases_full($database = null, $force_stats = false,
             unset($drop);
         }
         unset($sql_where_schema, $sql, $drops);
+    } else {
+        foreach ($GLOBALS['PMA_List_Database']->items as $database_name) {
+            // MySQL forward compatibility
+            // so pma could use this array as if every server is of version >5.0
+            $databases[$database_name]['SCHEMA_NAME']      = $database_name;
+
+            if ($force_stats) {
+                require_once 'mysql_charsets.lib.php';
+
+                $databases[$database_name]['DEFAULT_COLLATION_NAME']
+                    = PMA_getDbCollation($database_name);
+
+                // get additonal info about tables
+                $databases[$database_name]['SCHEMA_TABLES']          = 0;
+                $databases[$database_name]['SCHEMA_TABLE_ROWS']      = 0;
+                $databases[$database_name]['SCHEMA_DATA_LENGTH']     = 0;
+                $databases[$database_name]['SCHEMA_MAX_DATA_LENGTH'] = 0;
+                $databases[$database_name]['SCHEMA_INDEX_LENGTH']    = 0;
+                $databases[$database_name]['SCHEMA_LENGTH']          = 0;
+                $databases[$database_name]['SCHEMA_DATA_FREE']       = 0;
+
+                $res = PMA_DBI_query('SHOW TABLE STATUS FROM ' . PMA_backquote($database_name) . ';');
+                while ($row = PMA_DBI_fetch_assoc($res)) {
+                    $databases[$database_name]['SCHEMA_TABLES']++;
+                    $databases[$database_name]['SCHEMA_TABLE_ROWS']
+                        += $row['Rows'];
+                    $databases[$database_name]['SCHEMA_DATA_LENGTH']
+                        += $row['Data_length'];
+                    $databases[$database_name]['SCHEMA_MAX_DATA_LENGTH']
+                        += $row['Max_data_length'];
+                    $databases[$database_name]['SCHEMA_INDEX_LENGTH']
+                        += $row['Index_length'];
+                    $databases[$database_name]['SCHEMA_DATA_FREE']
+                        += $row['Data_free'];
+                    $databases[$database_name]['SCHEMA_LENGTH']
+                        += $row['Data_length'] + $row['Index_length'];
+                }
+                PMA_DBI_free_result($res);
+                unset($res);
+            }
+        }
+    }
+    
 
     /**
      * apply limit and order manually now
@@ -534,6 +580,7 @@ function PMA_DBI_get_columns_full($database = null, $table = null,
 {
     $columns = array();
 
+    if (! $GLOBALS['cfg']['Server']['DisableIS']) {
         $sql_wheres = array();
         $array_keys = array();
 
@@ -572,7 +619,78 @@ function PMA_DBI_get_columns_full($database = null, $table = null,
             $sql .= "\n" . ' WHERE ' . implode(' AND ', $sql_wheres);
         }
 
-    return PMA_DBI_fetch_result($sql, $array_keys, null, $link);
+        $columns = PMA_DBI_fetch_result($sql, $array_keys, null, $link);
+        unset($sql_wheres, $sql);
+    } else {
+        if (null === $database) {
+            foreach ($GLOBALS['PMA_List_Database']->items as $database) {
+                $columns[$database] = PMA_DBI_get_columns_full($database, null,
+                    null, $link);
+            }
+            return $columns;
+        } elseif (null === $table) {
+            $tables = PMA_DBI_get_tables($database);
+            foreach ($tables as $table) {
+                $columns[$table] = PMA_DBI_get_columns_full(
+                    $database, $table, null, $link);
+            }
+            return $columns;
+        }
+
+        $sql = 'SHOW FULL COLUMNS FROM '
+            . PMA_backquote($database) . '.' . PMA_backquote($table);
+        if (null !== $column) {
+            $sql .= " LIKE '" . $column . "'";
+        }
+
+        $columns = PMA_DBI_fetch_result($sql, 'Field', null, $link);
+
+        $ordinal_position = 1;
+        foreach ($columns as $column_name => $each_column) {
+
+            // MySQL forward compatibility
+            // so pma could use this array as if every server is of version >5.0
+            $columns[$column_name]['COLUMN_NAME']                 =& $columns[$column_name]['Field'];
+            $columns[$column_name]['COLUMN_TYPE']                 =& $columns[$column_name]['Type'];
+            $columns[$column_name]['COLLATION_NAME']              =& $columns[$column_name]['Collation'];
+            $columns[$column_name]['IS_NULLABLE']                 =& $columns[$column_name]['Null'];
+            $columns[$column_name]['COLUMN_KEY']                  =& $columns[$column_name]['Key'];
+            $columns[$column_name]['COLUMN_DEFAULT']              =& $columns[$column_name]['Default'];
+            $columns[$column_name]['EXTRA']                       =& $columns[$column_name]['Extra'];
+            $columns[$column_name]['PRIVILEGES']                  =& $columns[$column_name]['Privileges'];
+            $columns[$column_name]['COLUMN_COMMENT']              =& $columns[$column_name]['Comment'];
+
+            $columns[$column_name]['TABLE_CATALOG']               = null;
+            $columns[$column_name]['TABLE_SCHEMA']                = $database;
+            $columns[$column_name]['TABLE_NAME']                  = $table;
+            $columns[$column_name]['ORDINAL_POSITION']            = $ordinal_position;
+            $columns[$column_name]['DATA_TYPE']                   =
+                substr($columns[$column_name]['COLUMN_TYPE'], 0,
+                    strpos($columns[$column_name]['COLUMN_TYPE'], '('));
+            /**
+             * @todo guess CHARACTER_MAXIMUM_LENGTH from COLUMN_TYPE
+             */
+            $columns[$column_name]['CHARACTER_MAXIMUM_LENGTH']    = null;
+            /**
+             * @todo guess CHARACTER_OCTET_LENGTH from CHARACTER_MAXIMUM_LENGTH
+             */
+            $columns[$column_name]['CHARACTER_OCTET_LENGTH']      = null;
+            $columns[$column_name]['NUMERIC_PRECISION']           = null;
+            $columns[$column_name]['NUMERIC_SCALE']               = null;
+            $columns[$column_name]['CHARACTER_SET_NAME']          =
+                substr($columns[$column_name]['COLLATION_NAME'], 0,
+                    strpos($columns[$column_name]['COLLATION_NAME'], '_'));
+
+            $ordinal_position++;
+        }
+
+        if (null !== $column) {
+            reset($columns);
+            $columns = current($columns);
+        }
+    }
+
+    return $columns;
 }
 
 /**