WebSVN – Moodle – /lib/adodb/pivottable.inc.php

<?php
/**
 * PivotTable.
 *
 * This file is part of ADOdb, a Database Abstraction Layer library for PHP.
 *
 * @package ADOdb
 * @link https://adodb.org Project's web site and documentation
 * @link https://github.com/ADOdb/ADOdb Source code and issue tracker
 *
 * The ADOdb Library is dual-licensed, released under both the BSD 3-Clause
 * and the GNU Lesser General Public Licence (LGPL) v2.1 or, at your option,
 * any later version. This means you can use it in proprietary products.
 * See the LICENSE.md file distributed with this source code for details.
 * @license BSD-3-Clause
 * @license LGPL-2.1-or-later
 *
 * @copyright 2000-2013 John Lim
 * @copyright 2014 Damien Regad, Mark Newnham and the ADOdb community
 */

/*
 * 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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