library/adodb/pivottable.inc.php

   1 <?php
   2 /**
   3  * @version V4.93 10 Oct 2006 (c) 2000-2011 John Lim (jlim#natsoft.com). All rights reserved.
   4  * Released under both BSD license and Lesser GPL library license.
   5  * Whenever there is any discrepancy between the two licenses,
   6  * the BSD license will take precedence.
   7  *
   8  * Set tabs to 4 for best viewing.
   9  *
  10 */
  11
  12 /*
  13  * Concept from daniel.lucazeau@ajornet.com.
  14  *
  15  * @param db            Adodb database connection
  16  * @param tables        List of tables to join
  17  * @rowfields           List of fields to display on each row
  18  * @colfield            Pivot field to slice and display in columns, if we want to calculate
  19  *                                              ranges, we pass in an array (see example2)
  20  * @where                       Where clause. Optional.
  21  * @aggfield            This is the field to sum. Optional.
  22  *                                              Since 2.3.1, if you can use your own aggregate function
  23  *                                              instead of SUM, eg. $aggfield = 'fieldname'; $aggfn = 'AVG';
  24  * @sumlabel            Prefix to display in sum columns. Optional.
  25  * @aggfn                       Aggregate function to use (could be AVG, SUM, COUNT)
  26  * @showcount           Show count of records
  27  *
  28  * @returns                     Sql generated
  29  */
  30
  31  function PivotTableSQL(&$db,$tables,$rowfields,$colfield, $where=false,
  32         $aggfield = false,$sumlabel='Sum ',$aggfn ='SUM', $showcount = true)
  33  {
  34         if ($aggfield) $hidecnt = true;
  35         else $hidecnt = false;
  36
  37         $iif = strpos($db->databaseType,'access') !== false;
  38                 // note - vfp 6 still doesn' work even with IIF enabled || $db->databaseType == 'vfp';
  39
  40         //$hidecnt = false;
  41
  42         if ($where) $where = "\nWHERE $where";
  43         if (!is_array($colfield)) $colarr = $db->GetCol("select distinct $colfield from $tables $where order by 1");
  44         if (!$aggfield) $hidecnt = false;
  45
  46         $sel = "$rowfields, ";
  47         if (is_array($colfield)) {
  48                 foreach ($colfield as $k => $v) {
  49                         $k = trim($k);
  50                         if (!$hidecnt) {
  51                                 $sel .= $iif ?
  52                                         "\n\t$aggfn(IIF($v,1,0)) AS \"$k\", "
  53                                         :
  54                                         "\n\t$aggfn(CASE WHEN $v THEN 1 ELSE 0 END) AS \"$k\", ";
  55                         }
  56                         if ($aggfield) {
  57                                 $sel .= $iif ?
  58                                         "\n\t$aggfn(IIF($v,$aggfield,0)) AS \"$sumlabel$k\", "
  59                                         :
  60                                         "\n\t$aggfn(CASE WHEN $v THEN $aggfield ELSE 0 END) AS \"$sumlabel$k\", ";
  61                         }
  62                 }
  63         } else {
  64                 foreach ($colarr as $v) {
  65                         if (!is_numeric($v)) $vq = $db->qstr($v);
  66                         else $vq = $v;
  67                         $v = trim($v);
  68                         if (strlen($v) == 0     ) $v = 'null';
  69                         if (!$hidecnt) {
  70                                 $sel .= $iif ?
  71                                         "\n\t$aggfn(IIF($colfield=$vq,1,0)) AS \"$v\", "
  72                                         :
  73                                         "\n\t$aggfn(CASE WHEN $colfield=$vq THEN 1 ELSE 0 END) AS \"$v\", ";
  74                         }
  75                         if ($aggfield) {
  76                                 if ($hidecnt) $label = $v;
  77                                 else $label = "{$v}_$aggfield";
  78                                 $sel .= $iif ?
  79                                         "\n\t$aggfn(IIF($colfield=$vq,$aggfield,0)) AS \"$label\", "
  80                                         :
  81                                         "\n\t$aggfn(CASE WHEN $colfield=$vq THEN $aggfield ELSE 0 END) AS \"$label\", ";
  82                         }
  83                 }
  84         }
  85         if ($aggfield && $aggfield != '1'){
  86                 $agg = "$aggfn($aggfield)";
  87                 $sel .= "\n\t$agg as \"$sumlabel$aggfield\", ";
  88         }
  89
  90         if ($showcount)
  91                 $sel .= "\n\tSUM(1) as Total";
  92         else
  93                 $sel = substr($sel,0,strlen($sel)-2);
  94
  95
  96         // Strip aliases
  97         $rowfields = preg_replace('/ AS (\w+)/i', '', $rowfields);
  98
  99         $sql = "SELECT $sel \nFROM $tables $where \nGROUP BY $rowfields";
 100
 101         return $sql;
 102  }
 103
 104 /* EXAMPLES USING MS NORTHWIND DATABASE */
 105 if (0) {
 106
 107 # example1
 108 #
 109 # Query the main "product" table
 110 # Set the rows to CompanyName and QuantityPerUnit
 111 # and the columns to the Categories
 112 # and define the joins to link to lookup tables
 113 # "categories" and "suppliers"
 114 #
 115
 116  $sql = PivotTableSQL(
 117         $gDB,                                                                                   # adodb connection
 118         'products p ,categories c ,suppliers s',                # tables
 119         'CompanyName,QuantityPerUnit',                                  # row fields
 120         'CategoryName',                                                                 # column fields
 121         'p.CategoryID = c.CategoryID and s.SupplierID= p.SupplierID' # joins/where
 122 );
 123  print "<pre>$sql";
 124  $rs = $gDB->Execute($sql);
 125  rs2html($rs);
 126
 127 /*
 128 Generated SQL:
 129
 130 SELECT CompanyName,QuantityPerUnit,
 131         SUM(CASE WHEN CategoryName='Beverages' THEN 1 ELSE 0 END) AS "Beverages",
 132         SUM(CASE WHEN CategoryName='Condiments' THEN 1 ELSE 0 END) AS "Condiments",
 133         SUM(CASE WHEN CategoryName='Confections' THEN 1 ELSE 0 END) AS "Confections",
 134         SUM(CASE WHEN CategoryName='Dairy Products' THEN 1 ELSE 0 END) AS "Dairy Products",
 135         SUM(CASE WHEN CategoryName='Grains/Cereals' THEN 1 ELSE 0 END) AS "Grains/Cereals",
 136         SUM(CASE WHEN CategoryName='Meat/Poultry' THEN 1 ELSE 0 END) AS "Meat/Poultry",
 137         SUM(CASE WHEN CategoryName='Produce' THEN 1 ELSE 0 END) AS "Produce",
 138         SUM(CASE WHEN CategoryName='Seafood' THEN 1 ELSE 0 END) AS "Seafood",
 139         SUM(1) as Total
 140 FROM products p ,categories c ,suppliers s  WHERE p.CategoryID = c.CategoryID and s.SupplierID= p.SupplierID
 141 GROUP BY CompanyName,QuantityPerUnit
 142 */
 143 //=====================================================================
 144
 145 # example2
 146 #
 147 # Query the main "product" table
 148 # Set the rows to CompanyName and QuantityPerUnit
 149 # and the columns to the UnitsInStock for diiferent ranges
 150 # and define the joins to link to lookup tables
 151 # "categories" and "suppliers"
 152 #
 153  $sql = PivotTableSQL(
 154         $gDB,                                                                           # adodb connection
 155         'products p ,categories c ,suppliers s',        # tables
 156         'CompanyName,QuantityPerUnit',                          # row fields
 157                                                                                                 # column ranges
 158 array(
 159 ' 0 ' => 'UnitsInStock <= 0',
 160 "1 to 5" => '0 < UnitsInStock and UnitsInStock <= 5',
 161 "6 to 10" => '5 < UnitsInStock and UnitsInStock <= 10',
 162 "11 to 15"  => '10 < UnitsInStock and UnitsInStock <= 15',
 163 "16+" =>'15 < UnitsInStock'
 164 ),
 165         ' p.CategoryID = c.CategoryID and s.SupplierID= p.SupplierID', # joins/where
 166         'UnitsInStock',                                                         # sum this field
 167         'Sum'                                                                           # sum label prefix
 168 );
 169  print "<pre>$sql";
 170  $rs = $gDB->Execute($sql);
 171  rs2html($rs);
 172  /*
 173  Generated SQL:
 174
 175 SELECT CompanyName,QuantityPerUnit,
 176         SUM(CASE WHEN UnitsInStock <= 0 THEN UnitsInStock ELSE 0 END) AS "Sum  0 ",
 177         SUM(CASE WHEN 0 < UnitsInStock and UnitsInStock <= 5 THEN UnitsInStock ELSE 0 END) AS "Sum 1 to 5",
 178         SUM(CASE WHEN 5 < UnitsInStock and UnitsInStock <= 10 THEN UnitsInStock ELSE 0 END) AS "Sum 6 to 10",
 179         SUM(CASE WHEN 10 < UnitsInStock and UnitsInStock <= 15 THEN UnitsInStock ELSE 0 END) AS "Sum 11 to 15",
 180         SUM(CASE WHEN 15 < UnitsInStock THEN UnitsInStock ELSE 0 END) AS "Sum 16+",
 181         SUM(UnitsInStock) AS "Sum UnitsInStock",
 182         SUM(1) as Total
 183 FROM products p ,categories c ,suppliers s  WHERE  p.CategoryID = c.CategoryID and s.SupplierID= p.SupplierID
 184 GROUP BY CompanyName,QuantityPerUnit
 185  */
 186 }
 187 ?>