Feature 1459 : add support for SQLite3 via PDO

git-svn-id: http://piwigo.org/svn/trunk@4967 68402e56-0260-453c-a942-63ccdbb3a9ee

2 files changed, 602 insertions, 0 deletions

diff --git a/include/dblayer/dblayers.inc.php b/include/dblayer/dblayers.inc.php
index 73c972832..8ab5c3743 100644
--- a/include/dblayer/dblayers.inc.php
+++ b/include/dblayer/dblayers.inc.php
@@ -33,4 +33,9 @@ $dblayers['pgsql'] = array('engine' => 'PostgreSQL',
 $dblayers['sqlite'] = array('engine' => 'SQLite',
 			    'function_available' => 'sqlite_open'
 			    );
+
+$dblayers['pdo-sqlite'] = array('engine' => 'PDO::SQLite',
+				'class_available' => 'PDO'
+				);
+
 ?>
\ No newline at end of file
diff --git a/include/dblayer/functions_pdo-sqlite.inc.php b/include/dblayer/functions_pdo-sqlite.inc.php
new file mode 100644
index 000000000..6544cd79d
--- /dev/null
+++ b/include/dblayer/functions_pdo-sqlite.inc.php
@@ -0,0 +1,597 @@
+<?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_PDO-SQLITE_VERSION', '3.0.0');
+define('DB_ENGINE', 'SQLite');
+
+define('DB_REGEX_OPERATOR', 'REGEXP');
+define('DB_RANDOM_FUNCTION', 'RANDOM');
+
+/**
+ *
+ * simple functions
+ *
+ */
+
+function pwg_db_connect($host, $user, $password, $database)
+{
+  global $conf;
+
+  $db_file = sprintf('sqlite:%s/%s.db', $conf['local_data_dir'], $database);
+
+  try {
+    $link = new PDO($db_file);
+  } catch (Exception $e) {
+    my_error('sqlite::open', true);
+  }
+
+  $link->sqliteCreateFunction('now', 'pwg_now', 0);
+  $link->sqliteCreateFunction('unix_timestamp', 'pwg_unix_timestamp', 0);
+  $link->sqliteCreateFunction('md5', 'md5', 1);
+  $link->sqliteCreateFunction('if', 'pwg_if', 3);
+
+  $link->sqliteCreateAggregate('std', 'pwg_std_step', 'pwg_std_finalize');
+  $link->sqliteCreateFunction('regexp', 'pwg_regexp', 2);
+
+  return $link;
+}
+
+function pwg_db_check_charset() 
+{
+  return true;
+}
+
+function pwg_get_db_version() 
+{
+  global $pwg_db_link;
+
+  return $pwg_db_link->getAttribute(PDO::ATTR_SERVER_VERSION);
+}
+
+function pwg_query($query)
+{
+  global $conf,$page,$debug,$t2,$pwg_db_link;
+
+  $start = get_moment();
+
+  $truncate_pattern = '`truncate(.*)`i';
+  $insert_pattern = '`(INSERT INTO [^)]*\)\s*VALUES)(\([^)]*\))\s*,\s*(.*)`mi';  
+
+  if (preg_match($truncate_pattern, $query, $matches))
+  {
+    $query = str_replace('TRUNCATE TABLE', 'DELETE FROM', $query);
+    $truncate_query = true;
+    ($result = $pwg_db_link->exec($query)) or die($query."\n<br>".$pwg_db_link->errorInfo());
+  }
+  elseif (preg_match($insert_pattern, $query, $matches))
+  {
+    $base_query = substr($query, 0, strlen($matches[1])+1);
+    $values_pattern = '`\)\s*,\s*\(`';
+    $values = preg_split($values_pattern, substr($query, strlen($matches[1])+1));
+    $values[0] = substr($values[0], 1);
+    $values[count($values)-1] = substr($values[count($values)-1], 
+				     0, 
+				     strlen($values[count($values)-1])-1
+				     );
+    for ($n=0;$n<count($values);$n++)
+    {
+      $query = $base_query . '('. $values[$n] . ")\n;";
+      ($result = $pwg_db_link->query($query)) 
+	or die($query."\n<br>".$pwg_db_link->lastErrorMsg());
+    }
+  }
+  else 
+  {
+    ($result = $pwg_db_link->query($query)) 
+      or die($query."\n<br>".$pwg_db_link->errorInfo());
+  }
+
+  $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) 
+      and !isset($truncate_query))
+    {
+      $output.= "\n".'(affected rows   : ';
+      $output.= pwg_db_changes($result).' )';
+    }
+    $output.= "</pre>\n";
+
+    $debug .= $output;
+  }
+
+  return $result;
+}
+
+function pwg_db_nextval($column, $table)
+{
+  $query = '
+SELECT MAX('.$column.')+1
+  FROM '.$table;
+  list($next) = pwg_db_fetch_row(pwg_query($query));
+  if (is_null($next))
+  {
+    $next = 1;
+  }
+  return $next;
+}
+
+/**
+ *
+ * complex functions
+ *
+ */
+
+function pwg_db_changes(PDOStatement $result=null) 
+{
+  return $result->rowCount();
+}
+
+function pwg_db_num_rows(PDOStatement $result) 
+{ 
+  return $result->columnCount();
+}
+
+function pwg_db_fetch_assoc($result)
+{
+  return $result->fetch(PDO::FETCH_ASSOC);
+}
+
+function pwg_db_fetch_row($result)
+{
+  return $result->fetch(PDO::FETCH_NUM);
+}
+
+function pwg_db_fetch_object($result)
+{
+  return $result;
+}
+
+function pwg_db_free_result($result) 
+{
+}
+
+function pwg_db_real_escape_string($s)
+{
+  global $pwg_db_link;
+
+  return trim($pwg_db_link->quote($s), "'");
+}
+
+function pwg_db_insert_id($table=null, $column='id')
+{
+  global $pwg_db_link;
+
+  return $pwg_db_link->lastInsertRowID();
+}
+
+/**
+ *
+ * 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 ($row = pwg_db_fetch_assoc($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;
+
+  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);
+    }
+  }
+}
+
+
+/**
+ * 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
+  $query = 'SELECT name FROM SQLITE_MASTER
+WHERE name LIKE \''.$prefixeTable.'%\'';
+
+  $all_tables = array_from_query($query, 'name');
+  foreach ($all_tables as $table_name)
+  {
+    $query = 'VACUUM '.$table_name.';';
+    $result = pwg_query($query);
+  }
+  
+  array_push($page['infos'],
+	     l10n('Optimizations completed')
+	     );
+}
+
+function pwg_db_concat($array)
+{
+  return implode($array, ' || ');
+}
+
+function pwg_db_concat_ws($array, $separator)
+{
+  $glue = sprintf(' || \'%s\' || ', $separator);
+
+  return implode($array, $glue);
+}
+
+function pwg_db_cast_to_text($string)
+{
+  return $string;
+}
+
+/**
+ * returns an array containing the possible values of an enum field
+ *
+ * @param string tablename
+ * @param string fieldname
+ */
+function get_enums($table, $field)
+{
+  return array();
+}
+
+// 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 == 'true'))
+  {
+    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.'\'';
+  }
+
+  return 'date('.$date.',\''.-$period.' DAY\')';
+}
+
+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 'strftime(\'%Y%m\','.$date.')';
+}
+
+function pwg_db_get_date_MMDD($date)
+{
+  return 'strftime(\'%m%d\','.$date.')';
+}
+
+function pwg_db_get_year($date)
+{
+  return 'strftime(\'%Y\','.$date.')';
+}
+
+function pwg_db_get_month($date)
+{
+  return 'strftime(\'%m\','.$date.')';
+}
+
+function pwg_db_get_week($date, $mode=null)
+{
+  return 'strftime(\'%W\','.$date.')';
+}
+
+function pwg_db_get_dayofmonth($date)
+{
+  return 'strftime(\'%d\','.$date.')';
+}
+
+function pwg_db_get_dayofweek($date)
+{
+  return 'strftime(\'%w\','.$date.')';
+}
+
+function pwg_db_get_weekday($date)
+{
+  return 'strftime(\'%w\',date('.$date.',\'-1 DAY\'))';
+}
+
+// my_error returns (or send to standard output) the message concerning the
+// error occured for the last mysql query.
+function my_error($header, $die)
+{
+  global $pwg_db_link;
+
+  $error = '';
+  if (isset($pwg_db_link)) 
+  {
+    $error .= '[sqlite error]'.$pwg_db_link->errorInfo()."\n";
+  }
+
+  $error .= $header;
+
+  if ($die)
+  {
+    fatal_error($error);
+  }
+  echo("<pre>");
+  trigger_error($error, E_USER_WARNING);
+  echo("</pre>");
+}
+
+// sqlite create functions
+function pwg_now()
+{
+  return date('Y-m-d H:i:s');
+}
+
+function pwg_unix_timestamp()
+{
+  return time();
+}
+
+function pwg_if($expression, $value1, $value2) 
+{
+  if ($expression)
+  {
+    return $value1;
+  }
+  else
+  {
+    return $value2;
+  }
+} 
+
+function pwg_regexp($pattern, $string)
+{
+  $pattern = sprintf('`%s`', $pattern);
+  return preg_match($pattern, $string);
+}
+
+function pwg_std_step(&$values, $rownumber, $value) 
+{
+  $values[] = $value;
+
+  return $values;
+}
+
+function pwg_std_finalize(&$values, $rownumber) 
+{
+  if (count($values)<=1)
+  {
+    return 0;
+  }
+
+  $total = 0;
+  $total_square = 0;
+  foreach ($values as $value)
+  {
+    $total += $value;
+    $total_square += pow($value, 2);
+  }
+
+  $mean = $total/count($values);
+  $var = $total_square/count($values) - pow($mean, 2);
+  
+  return sqrt($var);
+}
+?>