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<?php
/**
* @version V4.93 10 Oct 2006 (c) 2000-2008 John Lim (jlim#natsoft.com.my). All rights reserved.
* Released under both BSD license and Lesser GPL library license.
* Whenever there is any discrepancy between the two licenses,
* the BSD license will take precedence.
*
* Set tabs to 4 for best viewing.
*
*/
/*
* Concept from daniel.lucazeau@ajornet.com.
*
* @param db Adodb database connection
* @param tables List of tables to join
* @rowfields List of fields to display on each row
* @colfield Pivot field to slice and display in columns, if we want to calculate
* ranges, we pass in an array (see example2)
* @where Where clause. Optional.
* @aggfield This is the field to sum. Optional.
* Since 2.3.1, if you can use your own aggregate function
* instead of SUM, eg. $aggfield = 'fieldname'; $aggfn = 'AVG';
* @sumlabel Prefix to display in sum columns. Optional.
* @aggfn Aggregate function to use (could be AVG, SUM, COUNT)
* @showcount Show count of records
*
* @returns Sql generated
*/
function PivotTableSQL(&$db,$tables,$rowfields,$colfield, $where=false,
$aggfield = false,$sumlabel='Sum ',$aggfn ='SUM', $showcount = true)
{
if ($aggfield) $hidecnt = true;
else $hidecnt = false;
$iif = strpos($db->databaseType,'access') !== false;
// note - vfp 6 still doesn' work even with IIF enabled || $db->databaseType == 'vfp';
//$hidecnt = false;
if ($where) $where = "\nWHERE $where";
if (!is_array($colfield)) $colarr = $db->GetCol("select distinct $colfield from $tables $where order by 1");
if (!$aggfield) $hidecnt = false;
$sel = "$rowfields, ";
if (is_array($colfield)) {
foreach ($colfield as $k => $v) {
$k = trim($k);
if (!$hidecnt) {
$sel .= $iif ?
"\n\t$aggfn(IIF($v,1,0)) AS \"$k\", "
:
"\n\t$aggfn(CASE WHEN $v THEN 1 ELSE 0 END) AS \"$k\", ";
}
if ($aggfield) {
$sel .= $iif ?
"\n\t$aggfn(IIF($v,$aggfield,0)) AS \"$sumlabel$k\", "
:
"\n\t$aggfn(CASE WHEN $v THEN $aggfield ELSE 0 END) AS \"$sumlabel$k\", ";
}
}
} else {
foreach ($colarr as $v) {
if (!is_numeric($v)) $vq = $db->qstr($v);
else $vq = $v;
$v = trim($v);
if (strlen($v) == 0 ) $v = 'null';
if (!$hidecnt) {
$sel .= $iif ?
"\n\t$aggfn(IIF($colfield=$vq,1,0)) AS \"$v\", "
:
"\n\t$aggfn(CASE WHEN $colfield=$vq THEN 1 ELSE 0 END) AS \"$v\", ";
}
if ($aggfield) {
if ($hidecnt) $label = $v;
else $label = "{$v}_$aggfield";
$sel .= $iif ?
"\n\t$aggfn(IIF($colfield=$vq,$aggfield,0)) AS \"$label\", "
:
"\n\t$aggfn(CASE WHEN $colfield=$vq THEN $aggfield ELSE 0 END) AS \"$label\", ";
}
}
}
if ($aggfield && $aggfield != '1'){
$agg = "$aggfn($aggfield)";
$sel .= "\n\t$agg as \"$sumlabel$aggfield\", ";
}
if ($showcount)
$sel .= "\n\tSUM(1) as Total";
else
$sel = substr($sel,0,strlen($sel)-2);
// Strip aliases
$rowfields = preg_replace('/ AS (\w+)/i', '', $rowfields);
$sql = "SELECT $sel \nFROM $tables $where \nGROUP BY $rowfields";
return $sql;
}
/* EXAMPLES USING MS NORTHWIND DATABASE */
if (0) {
# example1
#
# Query the main "product" table
# Set the rows to CompanyName and QuantityPerUnit
# and the columns to the Categories
# and define the joins to link to lookup tables
# "categories" and "suppliers"
#
$sql = PivotTableSQL(
$gDB, # adodb connection
'products p ,categories c ,suppliers s', # tables
'CompanyName,QuantityPerUnit', # row fields
'CategoryName', # column fields
'p.CategoryID = c.CategoryID and s.SupplierID= p.SupplierID' # joins/where
);
print "<pre>$sql";
$rs = $gDB->Execute($sql);
rs2html($rs);
/*
Generated SQL:
SELECT CompanyName,QuantityPerUnit,
SUM(CASE WHEN CategoryName='Beverages' THEN 1 ELSE 0 END) AS "Beverages",
SUM(CASE WHEN CategoryName='Condiments' THEN 1 ELSE 0 END) AS "Condiments",
SUM(CASE WHEN CategoryName='Confections' THEN 1 ELSE 0 END) AS "Confections",
SUM(CASE WHEN CategoryName='Dairy Products' THEN 1 ELSE 0 END) AS "Dairy Products",
SUM(CASE WHEN CategoryName='Grains/Cereals' THEN 1 ELSE 0 END) AS "Grains/Cereals",
SUM(CASE WHEN CategoryName='Meat/Poultry' THEN 1 ELSE 0 END) AS "Meat/Poultry",
SUM(CASE WHEN CategoryName='Produce' THEN 1 ELSE 0 END) AS "Produce",
SUM(CASE WHEN CategoryName='Seafood' THEN 1 ELSE 0 END) AS "Seafood",
SUM(1) as Total
FROM products p ,categories c ,suppliers s WHERE p.CategoryID = c.CategoryID and s.SupplierID= p.SupplierID
GROUP BY CompanyName,QuantityPerUnit
*/
//=====================================================================
# example2
#
# Query the main "product" table
# Set the rows to CompanyName and QuantityPerUnit
# and the columns to the UnitsInStock for diiferent ranges
# and define the joins to link to lookup tables
# "categories" and "suppliers"
#
$sql = PivotTableSQL(
$gDB, # adodb connection
'products p ,categories c ,suppliers s', # tables
'CompanyName,QuantityPerUnit', # row fields
# column ranges
array(
' 0 ' => 'UnitsInStock <= 0',
"1 to 5" => '0 < UnitsInStock and UnitsInStock <= 5',
"6 to 10" => '5 < UnitsInStock and UnitsInStock <= 10',
"11 to 15" => '10 < UnitsInStock and UnitsInStock <= 15',
"16+" =>'15 < UnitsInStock'
),
' p.CategoryID = c.CategoryID and s.SupplierID= p.SupplierID', # joins/where
'UnitsInStock', # sum this field
'Sum' # sum label prefix
);
print "<pre>$sql";
$rs = $gDB->Execute($sql);
rs2html($rs);
/*
Generated SQL:
SELECT CompanyName,QuantityPerUnit,
SUM(CASE WHEN UnitsInStock <= 0 THEN UnitsInStock ELSE 0 END) AS "Sum 0 ",
SUM(CASE WHEN 0 < UnitsInStock and UnitsInStock <= 5 THEN UnitsInStock ELSE 0 END) AS "Sum 1 to 5",
SUM(CASE WHEN 5 < UnitsInStock and UnitsInStock <= 10 THEN UnitsInStock ELSE 0 END) AS "Sum 6 to 10",
SUM(CASE WHEN 10 < UnitsInStock and UnitsInStock <= 15 THEN UnitsInStock ELSE 0 END) AS "Sum 11 to 15",
SUM(CASE WHEN 15 < UnitsInStock THEN UnitsInStock ELSE 0 END) AS "Sum 16+",
SUM(UnitsInStock) AS "Sum UnitsInStock",
SUM(1) as Total
FROM products p ,categories c ,suppliers s WHERE p.CategoryID = c.CategoryID and s.SupplierID= p.SupplierID
GROUP BY CompanyName,QuantityPerUnit
*/
}
?>
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