includes/db_pager.inc

   1 <?php
   2 /**********************************************************************
   3     Copyright (C) FrontAccounting, LLC.
   4         Released under the terms of the GNU General Public License, GPL,
   5         as published by the Free Software Foundation, either version 3
   6         of the License, or (at your option) any later version.
   7     This program is distributed in the hope that it will be useful,
   8     but WITHOUT ANY WARRANTY; without even the implied warranty of
   9     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  10     See the License here <http://www.gnu.org/licenses/gpl-3.0.html>.
  11 ***********************************************************************/
  12 //
  13 //      Controler part of database table pager with column sort.
  14 //      To display actual html object call display_db_pager($name) inside
  15 //  any form.
  16 //
  17 //      View definition you will find in the following file:
  18 include_once($path_to_root."/includes/ui/db_pager_view.inc");
  19
  20 class db_pager {
  21         var $sql;
  22         var $name;
  23         var $columns;           // column definitions (head, type, order)
  24
  25         var $marker;            // marker check function
  26         var $marker_txt;
  27         var $marker_class;
  28         var $notice_class;
  29         var $width;                     // table width (default '95%')
  30         var $header_fun;        // additional row between title and body
  31         var $header_class;
  32         var $footer_fun;
  33         var $footer_class;
  34         var $data = array();
  35
  36         var $curr_page,
  37                 $max_page,
  38             $last_page,
  39             $prev_page,
  40             $next_page,
  41             $first_page;
  42
  43         var $page_len,
  44             $rec_count;
  45
  46         var $select,
  47                 $where,
  48             $from,
  49                 $group,
  50                 $order;
  51         var     $extra_where;
  52
  53         var $ready = false; // this var is false after change in sql before first
  54                                                 // and before first query.
  55         var $inactive_ctrl = false;
  56         var $main_tbl;          // table and key field name for inactive ctrl and edit/delete links
  57         var $key;       // key field name
  58
  59         //  db_pager constructor
  60         //  accepts $sql like 'SELECT ...[FROM ...][WHERE ...][GROUP ...][ORDER ...]'
  61         //      $name is base name for pager controls
  62         function db_pager($sql, $name, $table = null, $page_len=0)
  63         {
  64                 $this->width = "95%";
  65                 if ($page_len == 0) $page_len = user_query_size();
  66                 $this->name = $name;
  67                 $this->page_len = $page_len;
  68                 $this->set_sql($sql);
  69         }
  70         //
  71         //      Parse base sql select query.
  72         //      or use an associative array.
  73         //  Usefull is the query can't be split correctly (using subquery for example).
  74         //  The associative array shouldn't contain the keyword itself.
  75         //  ex :
  76         //  array('select' => 'SUM(quantity)', 'from' => TB_PREF."stock_moves", 'group' => 'location')
  77         function set_sql($sql)
  78         {
  79                 if ($sql != $this->sql) {
  80                     $this->sql = $sql;
  81                     $this->ready = false;
  82
  83                                 if(is_array($sql)) {
  84                                         foreach(explode(' ', 'select from where group order') as $section) {
  85                                                 $this->$section = @$sql[$section];
  86                                         }
  87                                         $this->select = "SELECT ".$this->select;
  88                                 }
  89                                 else {
  90                                         // parse the query
  91                                                 $parts = preg_split('/\sORDER\s*BY\s/si', $sql, 2);
  92                                         if(count($parts) == 2) {
  93                                                 $sql = $parts[0];
  94                                                 $this->order = $parts[1];
  95                                         }
  96                                                 $parts = preg_split('/\sGROUP\s*BY\s/si', $sql, 2);
  97                                         if(count($parts) == 2) {
  98                                                 $sql = $parts[0];
  99                                                 $this->group = $parts[1];
 100                                         }
 101                                                 $parts = preg_split('/\sWHERE\s/si', $sql, 2);
 102                                         if(count($parts) == 2) {
 103                                                 $sql = $parts[0];
 104                                                 $this->where = $parts[1];
 105                                         }
 106                                                 $parts = preg_split('/\sFROM\s/si', $sql, 2);
 107                                         if(count($parts) == 2) {
 108                                                 $sql = $parts[0];
 109                                                 $this->from = $parts[1];
 110                                         }
 111                                         $this->select = $sql;
 112                         }
 113                 }
 114         }
 115         //
 116         //      Set additional constraint on record set
 117         //
 118         function set_where($where = null)
 119         {
 120                 if ($where) {
 121                 if (!is_array($where))
 122                           $where = array($where);
 123
 124                     if (count($where) == count($this->extra_where) &&
 125                                 !count(array_diff($this->extra_where, $where)))
 126                                  return;
 127                 }
 128                 $this->extra_where = $where;
 129                 $this->ready = false;
 130         }
 131         //
 132         //      Set query result page
 133         //
 134         function change_page($page=null)
 135         {
 136             $this->set_page($page);
 137             $this->query();
 138             return true;
 139         }
 140         //
 141         //      Change sort column direction
 142         //      in order asc->desc->none->asc
 143         //
 144         function sort_table($col)
 145         {
 146
 147                         $max_priority = 0;
 148                         foreach($this->columns as $id => $_col) {
 149                         if(!isset($_col['ord_priority'])) continue;
 150                                 $max_priority = max($max_priority, $_col['ord_priority']);
 151                         };
 152
 153
 154             $ord = $this->columns[$col]['ord'];
 155                 $this->columns[$col]['ord_priority']  = $max_priority+1; // set priority , higher than anything else
 156             $ord = ($ord == '') ? 'asc' : (($ord == 'asc') ? 'desc' : '');
 157             $this->columns[$col]['ord'] = $ord;
 158             $this->set_page(1);
 159             $this->query();
 160             return true;
 161         }
 162         //
 163         // Query database
 164         //
 165         function query()
 166         {
 167                 global $Ajax;
 168
 169                 $Ajax->activate("_{$this->name}_span");
 170             $this->data = array();
 171             if (!$this->_init())
 172                   return false;
 173
 174             if ($this->rec_count == 0) return true;
 175
 176             $sql = $this->_sql_gen(false);
 177
 178             $result = db_query($sql, 'Error browsing database: '.$sql );
 179
 180             if ($result) {
 181                 // setting field names for subsequent queries
 182                         $c = 0;
 183                   // add result field names to column defs for
 184                   // col value retrieve and sort purposes
 185                    $cnt = min(db_num_fields($result), count($this->columns));
 186                         for ($c = $i = 0; $c < $cnt; $c++) {
 187                                 if (!(isset($this->columns[$c]['insert']) && $this->columns[$c]['insert'])) {
 188 //                                      if (!@($this->columns[$c]['type']=='skip'))
 189                                                 $this->columns[$c]['name']= db_field_name($result, $i);
 190                                         if (!@($this->columns[$c]['type']=='insert'))
 191                                         $i++;
 192                                         }
 193                         }
 194                         while ($row = db_fetch_assoc($result)) {
 195                                 $this->data[] = $row;
 196                         }
 197                 } else
 198                   return false;
 199                 return true;
 200         }
 201         //
 202         //      Calculates page numbers for html controls.
 203         //
 204         function set_page($to)
 205         {
 206             switch($to) {
 207                 case 'next':
 208                     $page = $this->curr_page+1; break;
 209                 case 'prev':
 210                     $page = $this->curr_page-1; break;
 211                 case 'last':
 212                     $page = $this->last_page; break;
 213                 default:
 214                     if (is_numeric($to)) {
 215                          $page = $to; break;
 216                     }
 217                 case 'first':
 218                     $page = 1; break;
 219             }
 220           if ($page < 1)
 221             $page = 1;
 222           $max = $this->max_page;
 223           if ($page > $max)
 224             $page = $max;
 225           $this->curr_page = $page;
 226           $this->next_page = ($page < $max) ? $page+1 : null;
 227           $this->prev_page = ($page > 1) ? ($page-1) : null;
 228           $this->last_page = ($page < $max) ? $max : null;
 229           $this->first_page = ($page != 1) ? 1: null;
 230         }
 231         //
 232         //      Set column definitions
 233         //  $flds: array( fldname1, fldname2=>type,...)
 234         function set_columns($flds)
 235         {
 236                 $this->columns = array();
 237                 if (!is_array($flds)) {
 238                         $flds = array($flds);
 239                 }
 240                 foreach ($flds as $colnum=>$coldef) {
 241                         if (is_string($colnum)) {       // 'colname'=>params
 242                           $h = $colnum;
 243                           $c = $coldef;
 244                         } else {                        //  n=>params
 245                                 if (is_array($coldef)) {
 246                                         $h = '';
 247                                         $c = $coldef;
 248                                 } else {
 249                                         $h = $coldef;
 250                                         $c = 'text';
 251                                 }
 252                         }
 253                         if (is_string($c))                      // params is simple column type
 254                           $c = array('type'=>$c);
 255
 256                         if (!isset($c['type']))
 257                           $c['type'] = 'text';
 258
 259                         switch($c['type']) {
 260                                 case 'inactive':
 261                                         $this->inactive_ctrl = true;
 262                                 case 'insert':
 263                                 default:
 264                                         $c['head'] = $h; break;
 265                                 case 'skip':            // skip the column (no header)
 266                                         unset($c['head']); break;
 267                         }
 268                         $this->columns[] = $c;
 269                 }
 270         }
 271         //
 272         // Generate db query from base sql
 273         // $count==false - for current page data retrieval
 274         // $count==true  - for total records count
 275         //
 276         function _sql_gen($count=false)
 277         {
 278                 $select = $this->select;
 279                 $from = $this->from;
 280                 $where = $this->where;
 281                 $group = $this->group;
 282                 $order = $this->order;
 283
 284                 if(count($this->extra_where)) {
 285                     $where .= ($where=='' ? '' : ' AND ')
 286                                 .implode(' AND ', $this->extra_where);
 287                 }
 288                 if ($where) $where = " WHERE ($where)";
 289
 290                 if ($count) {
 291                         $group = $group == '' ? "*" : "DISTINCT $group";
 292
 293                         return "SELECT COUNT(*) FROM (SELECT $group FROM $from $where) tmp_count";
 294                 }
 295
 296                 $sql = "$select FROM $from $where";
 297                 if ($group) $sql.= " GROUP BY $group";
 298             $ord = array();
 299
 300                         // sort order column by priority instead of table order.
 301                         $columns = array();
 302             foreach ($this->columns as $col) {
 303                                         if(isset($col['ord_priority'])) {
 304                                                 $columns[$col['ord_priority']] = $col;
 305                                         }
 306                         }
 307                         krsort($columns);
 308
 309             foreach ($columns as $col) {
 310                 if (isset($col['ord'])) {
 311                         if ( $col['ord'] != '' && isset($col['name'])) {
 312                             $ord[] = $col['name'] .' '. $col['ord'];
 313                             }
 314                         }
 315             }
 316
 317             if (count($ord)) {
 318                         $ord = array_map(function_exists('mysql_real_escape_string') ?
 319                                 'mysql_real_escape_string': 'mysql_escape_string', $ord);
 320                         $sql .= " ORDER BY " . implode(',', $ord);
 321                 } else {
 322                         if($order)
 323                                 $sql .= " ORDER BY $order"; // original base query order
 324                 }
 325
 326             $page_len = $this->page_len;
 327             $offset = ($this->curr_page - 1) * $page_len;
 328
 329             $sql .= " LIMIT $offset, $page_len";
 330
 331                 return $sql;
 332
 333         }
 334         //
 335         //      Initialization after changing record set
 336         //
 337         function _init()
 338         {
 339                 global $go_debug;
 340
 341             if ($this->ready == false ) {
 342                         $sql = $this->_sql_gen(true);
 343                         $result = db_query($sql, 'Error reading record set');
 344                         if ($result == false)
 345                                 return false;
 346                         $row = db_fetch_row($result);
 347                         $this->rec_count = $row[0];
 348                         $this->max_page = $this->page_len ?
 349                                 ceil($this->rec_count/$this->page_len) : 0;
 350
 351                         if ($go_debug) { // FIX - need column name parsing, but for now:
 352                                 // check if field names are set explicite in col def
 353                                 // for all initially ordered columns
 354                             foreach ($this->columns as $col) {
 355                                 if (isset($col['ord']) && $col['ord'] != ''
 356                                                 &&  !isset($col['name'])) {
 357                                                         display_warning("Result field names must be set
 358                                                                 for all intially ordered db_pager columns.");
 359                                 }
 360                                 }
 361                 }
 362                         $this->set_page(1);
 363                         $this->ready = true;
 364             }
 365         return true;
 366         }
 367         //
 368         //      Set current page in response to user control.
 369         //
 370         function select_records()
 371         {
 372                 global $Ajax;
 373
 374                 $page = find_submit($this->name.'_page_', false);
 375                 $sort = find_submit($this->name.'_sort_', true);
 376                 if ($page) {
 377                         $this->change_page($page);
 378                         if ($page == 'next' && !$this->next_page ||
 379                                 $page == 'last' && !$this->last_page)
 380                                         set_focus($this->name.'_page_prev');
 381                         if ($page == 'prev' && !$this->prev_page ||
 382                                 $page == 'first' && !$this->first_page)
 383                                         set_focus($this->name.'_page_next');
 384                 } elseif ($sort != -1) {
 385                         $this->sort_table($sort);
 386                 } else
 387                         $this->query();
 388         }
 389         //
 390         //      Set check function to mark some rows.
 391         //
 392         function set_marker($func, $notice='', $markercl='overduebg', $msgclass='overduefg' )
 393         {
 394                 $this->marker = $func;
 395                 $this->marker_txt = $notice;
 396                 $this->marker_class = $markercl;
 397                 $this->notice_class = $msgclass;
 398         }
 399         //
 400         //      Set handler to display additional row between titles and pager body.
 401         //      Return array of column contents.
 402         //
 403         function set_header($func, $headercl='inquirybg')
 404         {
 405                 $this->header_fun = $func;
 406                 $this->header_class = $headercl;
 407         }
 408         //
 409         //      Set handler to display additional row between pager body and navibar.
 410         //      Return array of column contents.
 411         //
 412         function set_footer($func, $footercl='inquirybg')
 413         {
 414                 $this->footer_fun = $func;
 415                 $this->footer_class = $footercl;
 416         }
 417         //
 418         //      Setter for table editors with inactive cell control.
 419         //
 420         function set_inactive_ctrl($table, $key) {
 421                 $this->inactive_ctrl = array('table'=>$table, 'key'=>$key);
 422         }
 423         //
 424         //      Helper for display inactive control cells
 425         //
 426         function inactive_control_cell(&$row)
 427         {
 428                 if ($this->inactive_ctrl) {
 429 //                      return inactive_control_cell($row[$this->inactive_ctrl['key']],
 430 //                               $row['inactive'], $this->inactive_ctrl['table'],
 431 //                               $this->inactive_ctrl['key']);
 432
 433                         global  $Ajax;
 434
 435                         $key = $this->key ?
 436                                 $this->key : $this->columns[0]['name'];         // TODO - support for complex keys
 437                         $id = $row[$key];
 438                         $table = $this->main_tbl;
 439                         $name = "Inactive". $id;
 440                         $value = $row['inactive'] ? 1:0;
 441
 442                         if (check_value('show_inactive')) {
 443                                 if (isset($_POST['LInact'][$id]) && (get_post('_Inactive'.$id.'_update') ||
 444                                         get_post('Update')) && (check_value('Inactive'.$id) != $value)) {
 445                                         update_record_status($id, !$value, $table, $key);
 446                                         $value = !$value;
 447                                 }
 448                                 echo '<td align="center">'. checkbox(null, $name, $value, true, '')
 449                                 . hidden("LInact[$id]", $value, false) . '</td>';
 450                         }
 451                 } else
 452                         return '';
 453         }
 454
 455 };
 456 //-----------------------------------------------------------------------------
 457 //      Creates new db_pager $_SESSION object on first page call.
 458 //  Retrieves from $_SESSION var on subsequent $_POST calls
 459 //
 460 //  $name - base name for pager controls and $_SESSION object name
 461 //  $sql  - base sql for data inquiry. Order of fields implies
 462 //              pager columns order.
 463 //      $coldef - array of column definitions. Example definitions
 464 //              Column with title 'User name' and default text format:
 465 //                              'User name'
 466 //              Skipped field from sql query. Data for the field is not displayed:
 467 //                              'dummy' => 'skip'
 468 //              Column without title, data retrieved form row data with function func():
 469 //                              array('fun'=>'func')
 470 //              Inserted column with title 'Some', formated with function rowfun().
 471 //      formated as date:
 472 //                              'Some' => array('type'=>'date, 'insert'=>true, 'fun'=>'rowfun')
 473 //              Column with name 'Another', formatted as date,
 474 // sortable with ascending start order (available orders: asc,desc, '').
 475 //                              'Another' => array('type'=>'date', 'ord'=>'asc')
 476 //
 477 //      All available column format types you will find in db_pager_view.inc file.
 478 //              If query result has more fields than count($coldef), rest of data is ignored
 479 //  during display, but can be used in format handlers for 'spec' and 'insert'
 480 //      type columns.
 481
 482 function &new_db_pager($name, $sql, $coldef, $table = null, $key = null, $page_len = 0)  {
 483
 484     if (isset($_SESSION[$name]) &&
 485                  ($_SERVER['REQUEST_METHOD'] == 'GET' || $_SESSION[$name]->sql != $sql)) {
 486                 unset($_SESSION[$name]); // kill pager if sql has changed
 487         }
 488         if (!isset($_SESSION[$name])) {
 489             $_SESSION[$name] = new db_pager($sql, $name, $table, $page_len);
 490                 $_SESSION[$name]->main_tbl = $table;
 491                 $_SESSION[$name]->key = $key;
 492                 $_SESSION[$name]->set_sql($sql);
 493                 $_SESSION[$name]->set_columns($coldef);
 494         }
 495
 496         return  $_SESSION[$name];
 497
 498 }
 499 //
 500 //      Force pager initialization.
 501 //
 502 function refresh_pager($name)
 503 {
 504         if (isset($_SESSION[$name]))
 505                 $_SESSION[$name]->ready = false;
 506 }
 507 ?>