Feature 1255 :

- add postgres database engine
- change installation process to allow postgres or mysql database

git-svn-id: http://piwigo.org/svn/trunk@4410 68402e56-0260-453c-a942-63ccdbb3a9ee

1 files changed, 581 insertions, 0 deletions

diff --git a/include/dblayer/functions_pgsql.inc.php b/include/dblayer/functions_pgsql.inc.php
new file mode 100644
index 000000000..9e51aef04
--- /dev/null
+++ b/include/dblayer/functions_pgsql.inc.php
@@ -0,0 +1,581 @@
+<?php
+// +-----------------------------------------------------------------------+
+// | Piwigo - a PHP based picture gallery                                  |
+// +-----------------------------------------------------------------------+
+// | Copyright(C) 2008-2009 Piwigo Team                  http://piwigo.org |
+// | Copyright(C) 2003-2008 PhpWebGallery Team    http://phpwebgallery.net |
+// | Copyright(C) 2002-2003 Pierrick LE GALL   http://le-gall.net/pierrick |
+// +-----------------------------------------------------------------------+
+// | 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                                          |
+// |                                                                       |
+// | This program is distributed in the hope that it will be useful, but   |
+// | WITHOUT ANY WARRANTY; without even the implied warranty of            |
+// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      |
+// | General Public License for more details.                              |
+// |                                                                       |
+// | You should have received a copy of the GNU General Public License     |
+// | along with this program; if not, write to the Free Software           |
+// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
+// | USA.                                                                  |
+// +-----------------------------------------------------------------------+
+
+define('REQUIRED_PGSQL_VERSION', '8.0');
+define('DB_ENGINE', 'PostgreSQL');
+
+define('DB_REGEX_OPERATOR', '~');
+define('DB_RANDOM_FUNCTION', 'RANDOM');
+
+/**
+ *
+ * simple functions
+ *
+ */
+
+function pwg_db_connect($host, $user, $password, $database)
+{
+  $connection_string = '';
+  if (strpos($host,':') !== false) 
+  {
+    list($host, $port) = explode(':', $host);
+  }
+  $connection_string = sprintf('host=%s', $host);
+  if (!empty($port))
+  {
+    $connection_string .= sprintf(' port=%d', $port);
+  }
+  $connection_string .= sprintf(' user=%s password=%s dbname=%s', 
+				$user, 
+				$password,
+				$database);
+  $link = pg_connect($connection_string) or my_error('pg_connect', true);  
+
+  return $link;
+}
+
+function pwg_db_check_charset() 
+{
+  return true;
+}
+
+function pwg_get_db_version() 
+{
+  list($pg_version) = pwg_db_fetch_row(pwg_query('SHOW SERVER_VERSION;'));
+  
+  return $pg_version;
+}
+
+function pwg_query($query)
+{
+  global $conf,$page,$debug,$t2;
+
+  //  Log::getInstance()->debug($query);
+
+  $start = get_moment();
+  ($result = pg_query($query)) or die($query."\n<br>".pg_last_error());
+
+  $time = get_moment() - $start;
+
+  if (!isset($page['count_queries']))
+  {
+    $page['count_queries'] = 0;
+    $page['queries_time'] = 0;
+  }
+
+  $page['count_queries']++;
+  $page['queries_time']+= $time;
+
+  if ($conf['show_queries'])
+  {
+    $output = '';
+    $output.= '<pre>['.$page['count_queries'].'] ';
+    $output.= "\n".$query;
+    $output.= "\n".'(this query time : ';
+    $output.= '<b>'.number_format($time, 3, '.', ' ').' s)</b>';
+    $output.= "\n".'(total SQL time  : ';
+    $output.= number_format($page['queries_time'], 3, '.', ' ').' s)';
+    $output.= "\n".'(total time      : ';
+    $output.= number_format( ($time+$start-$t2), 3, '.', ' ').' s)';
+    if ( $result!=null and preg_match('/\s*SELECT\s+/i',$query) )
+    {
+      $output.= "\n".'(num rows        : ';
+      $output.= pwg_db_num_rows($result).' )';
+    }
+    elseif ( $result!=null
+      and preg_match('/\s*INSERT|UPDATE|REPLACE|DELETE\s+/i',$query) )
+    {
+      $output.= "\n".'(affected rows   : ';
+      $output.= pwg_db_changes($result).' )';
+    }
+    $output.= "</pre>\n";
+
+    $debug .= $output;
+  }
+
+  return $result;
+}
+
+function pwg_db_nextval($column, $table)
+{
+  $query = '
+SELECT nextval(\''.$table.'_'.$column.'_seq\')';
+  list($next) = pwg_db_fetch_row(pwg_query($query));
+
+  return $next;
+}
+
+/**
+ *
+ * complex functions
+ *
+ */
+
+function pwg_db_changes($result) 
+{
+  return pg_affected_rows($result);
+}
+
+function pwg_db_num_rows($result) 
+{
+  return pg_num_rows($result);
+}
+
+function pwg_db_fetch_assoc($result)
+{
+  return pg_fetch_assoc($result);
+}
+
+function pwg_db_fetch_row($result)
+{
+  return pg_fetch_row($result);
+}
+
+function pwg_db_fetch_object($result)
+{
+  return pg_fetch_object($result);
+}
+
+function pwg_db_free_result($result) 
+{
+  return pg_free_result($result);
+}
+
+function pwg_db_real_escape_string($s)
+{
+  return pg_escape_string($s);
+}
+
+function pwg_db_insert_id()
+{
+  // select currval('piwigo_user_id_seq');
+}
+
+/**
+ *
+ * complex functions
+ *
+ */
+
+/**
+ * creates an array based on a query, this function is a very common pattern
+ * used here
+ *
+ * @param string $query
+ * @param string $fieldname
+ * @return array
+ */
+function array_from_query($query, $fieldname)
+{
+  $array = array();
+
+  $result = pwg_query($query);
+  while ($row = pg_fetch_assoc($result))
+  {
+    array_push($array, $row[$fieldname]);
+  }
+
+  return $array;
+}
+
+define('MASS_UPDATES_SKIP_EMPTY', 1);
+/**
+ * updates multiple lines in a table
+ *
+ * @param string table_name
+ * @param array dbfields
+ * @param array datas
+ * @param int flags - if MASS_UPDATES_SKIP_EMPTY - empty values do not overwrite existing ones
+ * @return void
+ */
+function mass_updates($tablename, $dbfields, $datas, $flags=0)
+{
+  if (count($datas) == 0)
+    return;
+  // depending on the MySQL version, we use the multi table update or N update queries
+  if (count($datas) < 10)
+  { // MySQL is prior to version 4.0.4, multi table update feature is not available
+    foreach ($datas as $data)
+    {
+      $query = '
+UPDATE '.$tablename.'
+  SET ';
+      $is_first = true;
+      foreach ($dbfields['update'] as $key)
+      {
+        $separator = $is_first ? '' : ",\n    ";
+
+        if (isset($data[$key]) and $data[$key] != '')
+        {
+          $query.= $separator.$key.' = \''.$data[$key].'\'';
+        }
+        else
+        {
+          if ($flags & MASS_UPDATES_SKIP_EMPTY )
+            continue; // next field
+          $query.= "$separator$key = NULL";
+        }
+        $is_first = false;
+      }
+      if (!$is_first)
+      {// only if one field at least updated
+        $query.= '
+  WHERE ';
+        $is_first = true;
+        foreach ($dbfields['primary'] as $key)
+        {
+          if (!$is_first)
+          {
+            $query.= ' AND ';
+          }
+          if ( isset($data[$key]) )
+          {
+            $query.= $key.' = \''.$data[$key].'\'';
+          }
+          else
+          {
+            $query.= $key.' IS NULL';
+          }
+          $is_first = false;
+        }
+        pwg_query($query);
+      }
+    } // foreach update
+  } // if mysql_ver or count<X
+  else
+  {
+    $all_fields = array_merge($dbfields['primary'], $dbfields['update']);
+    $temporary_tablename = $tablename.'_'.micro_seconds();
+    $query = '
+CREATE TABLE '.$temporary_tablename.' 
+  AS SELECT * FROM '.$tablename.' WHERE 1=2';
+
+    pwg_query($query);
+    mass_inserts($temporary_tablename, $all_fields, $datas);
+    if ( $flags & MASS_UPDATES_SKIP_EMPTY )
+      $func_set = create_function('$s, $t', 'return "$s = IFNULL(t2.$s, '.$tablename.'.$s)";');
+    else
+      $func_set = create_function('$s', 'return "$s = t2.$s";');
+
+    // update of images table by joining with temporary table
+    $query = '
+UPDATE '.$tablename.'
+  SET '.
+      implode(
+        "\n    , ",
+        array_map($func_set, $dbfields['update'])
+        ).'
+FROM '.$temporary_tablename.' AS t2
+  WHERE '.
+      implode(
+        "\n    AND ",
+        array_map(
+          create_function('$s, $t', 'return "'.$tablename.'.$s = t2.$s";'),
+          $dbfields['primary']
+          )
+        );
+    pwg_query($query);
+    $query = '
+DROP TABLE '.$temporary_tablename;
+    pwg_query($query);
+  }
+}
+
+
+/**
+ * inserts multiple lines in a table
+ *
+ * @param string table_name
+ * @param array dbfields
+ * @param array inserts
+ * @return void
+ */
+
+function mass_inserts($table_name, $dbfields, $datas)
+{
+  if (count($datas) != 0)
+  {
+    $first = true;
+
+    $packet_size = 16777216;
+    $packet_size = $packet_size - 2000; // The last list of values MUST not exceed 2000 character*/
+    $query = '';
+
+    foreach ($datas as $insert)
+    {
+      if (strlen($query) >= $packet_size)
+      {
+        pwg_query($query);
+        $first = true;
+      }
+
+      if ($first)
+      {
+        $query = '
+INSERT INTO '.$table_name.'
+  ('.implode(',', $dbfields).')
+  VALUES';
+        $first = false;
+      }
+      else
+      {
+        $query .= '
+  , ';
+      }
+
+      $query .= '(';
+      foreach ($dbfields as $field_id => $dbfield)
+      {
+        if ($field_id > 0)
+        {
+          $query .= ',';
+        }
+
+        if (!isset($insert[$dbfield]) or $insert[$dbfield] === '')
+        {
+          $query .= 'NULL';
+        }
+        else
+        {
+          $query .= "'".$insert[$dbfield]."'";
+        }
+      }
+      $query .= ')';
+    }
+    pwg_query($query);
+  }
+}
+
+/**
+ * Do maintenance on all PWG tables
+ *
+ * @return none
+ */
+function do_maintenance_all_tables()
+{
+  global $prefixeTable, $page;
+
+  $all_tables = array();
+
+  // List all tables
+  $query = 'SHOW TABLES LIKE \''.$prefixeTable.'%\'';
+  $result = pwg_query($query);
+  while ($row = pwg_db_fetch_assoc($result))
+  {
+    array_push($all_tables, $row[0]);
+  }
+
+  // Repair all tables
+  $query = 'REPAIR TABLE '.implode(', ', $all_tables);
+  $mysql_rc = pwg_query($query);
+
+  // Re-Order all tables
+  foreach ($all_tables as $table_name)
+  {
+    $all_primary_key = array();
+
+    $query = 'DESC '.$table_name.';';
+    $result = pwg_query($query);
+    while ($row = pwg_db_fetch_assoc($result))
+    {
+      if ($row['Key'] == 'PRI')
+      {
+        array_push($all_primary_key, $row['Field']);
+      }
+    }
+
+    if (count($all_primary_key) != 0)
+    {
+      $query = 'ALTER TABLE '.$table_name.' ORDER BY '.implode(', ', $all_primary_key).';';
+      $mysql_rc = $mysql_rc && pwg_query($query);
+    }
+  }
+
+  // Optimize all tables
+  $query = 'OPTIMIZE TABLE '.implode(', ', $all_tables);
+  $mysql_rc = $mysql_rc && pwg_query($query);
+  if ($mysql_rc)
+  {
+    array_push(
+          $page['infos'],
+          l10n('Optimizations completed')
+          );
+  }
+  else
+  {
+    array_push(
+          $page['errors'],
+          l10n('Optimizations errors')
+          );
+  }
+}
+
+function pwg_db_concat_ws($string, $separaor)
+{
+  return 'ARRAY_TO_STRING(ARRAY['.$string.'],\''.$separaor.'\')';
+}
+
+function pwg_db_cast_to_text($string)
+{
+  return 'CAST('.$string.' AS TEXT)';
+}
+
+/**
+ * returns an array containing the possible values of an enum field
+ *
+ * @param string tablename
+ * @param string fieldname
+ */
+function get_enums($table, $field)
+{
+  $typname = preg_replace('/'.$GLOBALS['prefixeTable'].'/', '', $table); 
+  Log::getInstance()->debug($typname);
+  $typname .= '_' . $field;
+
+  $query = 'SELECT 
+enumlabel FROM pg_enum JOIN pg_type
+  ON pg_enum.enumtypid=pg_type.oid 
+  WHERE typname=\''.$typname.'\'
+';
+  $result = pwg_query($query);
+  while ($row = pwg_db_fetch_assoc($result))
+  {
+    $options[] = $row['enumlabel'];
+  }
+
+  return $options;
+}
+
+// get_boolean transforms a string to a boolean value. If the string is
+// "false" (case insensitive), then the boolean value false is returned. In
+// any other case, true is returned.
+function get_boolean( $string )
+{
+  $boolean = true;
+  if ('f' == $string || 'false' == $string)
+  {
+    $boolean = false;
+  }
+  return $boolean;
+}
+
+/**
+ * returns boolean string 'true' or 'false' if the given var is boolean
+ *
+ * @param mixed $var
+ * @return mixed
+ */
+function boolean_to_string($var)
+{
+  if (!empty($var) && ($var == 't'))
+  {
+    return 'true';
+  }
+  else
+  {
+    return 'false';
+  }
+}
+
+/**
+ *
+ * interval and date functions 
+ *
+ */
+
+function pwg_db_get_recent_period_expression($period, $date='CURRENT_DATE')
+{
+  if ($date!='CURRENT_DATE')
+  {
+    $date = '\''.$date.'\'::date';
+  }
+
+  return '('.$date.' - \''.$period.' DAY\'::interval)::date';
+}
+
+function pwg_db_get_recent_period($period, $date='CURRENT_DATE')
+{
+  $query = 'select '.pwg_db_get_recent_period_expression($period, $date);
+  list($d) = pwg_db_fetch_row(pwg_query($query));
+
+  return $d;
+}
+
+function pwg_db_get_date_YYYYMM($date)
+{
+  return 'TO_CHAR('.$date.', \'YYYYMM\')';
+}
+
+function pwg_db_get_date_MMDD($date)
+{
+  return 'TO_CHAR('.$date.', \'MMDD\')';
+}
+
+function pwg_db_get_year($date)
+{
+  return 'EXTRACT(YEAR FROM '.$date.')';
+}
+
+function pwg_db_get_month($date)
+{
+  return 'EXTRACT(MONTH FROM '.$date.')';
+}
+
+function pwg_db_get_week($date, $mode=null)
+{
+  return 'EXTRACT(WEEK FROM '.$date.')';
+}
+
+function pwg_db_get_dayofmonth($date)
+{
+  return 'EXTRACT(DAY FROM '.$date.')';
+}
+
+function pwg_db_get_dayofweek($date)
+{
+  return 'EXTRACT(DOW FROM '.$date.')::INTEGER - 1';
+}
+
+function pwg_db_get_weekday($date)
+{
+  return 'EXTRACT(ISODOW FROM '.$date.')::INTEGER - 1';
+}
+
+// my_error returns (or send to standard output) the message concerning the
+// error occured for the last mysql query.
+function my_error($header, $die)
+{
+  $error = '[pgsql error]'.pg_last_error()."\n";
+  $error .= $header;
+
+  if ($die)
+  {
+    fatal_error($error);
+  }
+  echo("<pre>");
+  trigger_error($error, E_USER_WARNING);
+  echo("</pre>");
+}
+
+
+?>
\ No newline at end of file