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pivottable.inc.php
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1 <?php
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 }
$sql
$sql
Definition: server.php:82
$rs
if(isset($_REQUEST['nrows'])) else $rs
Definition: server.php:92
PivotTableSQL
PivotTableSQL(&$db, $tables, $rowfields, $colfield, $where=false, $aggfield=false, $sumlabel='Sum ', $aggfn='SUM', $showcount=true)
Definition: pivottable.inc.php:31
rs2html
rs2html(&$rs, $ztabhtml=false, $zheaderarray=false, $htmlspecialchars=true, $echo=true)
Definition: tohtml.inc.php:41