| 1 | <?php
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| 2 | /**
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| 3 | * @version V4.93 10 Oct 2006 (c) 2000-2007 John Lim (jlim#natsoft.com.my). All rights reserved.
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| 4 | * Released under both BSD license and Lesser GPL library license.
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| 5 | * Whenever there is any discrepancy between the two licenses,
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| 6 | * the BSD license will take precedence.
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| 7 | *
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| 8 | * Set tabs to 4 for best viewing.
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| 9 | *
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| 10 | */
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| 11 |
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| 12 | /*
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| 13 | * Concept from daniel.lucazeau@ajornet.com.
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| 14 | *
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| 15 | * @param db Adodb database connection
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| 16 | * @param tables List of tables to join
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| 17 | * @rowfields List of fields to display on each row
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| 18 | * @colfield Pivot field to slice and display in columns, if we want to calculate
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| 19 | * ranges, we pass in an array (see example2)
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| 20 | * @where Where clause. Optional.
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| 21 | * @aggfield This is the field to sum. Optional.
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| 22 | * Since 2.3.1, if you can use your own aggregate function
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| 23 | * instead of SUM, eg. $aggfield = 'fieldname'; $aggfn = 'AVG';
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| 24 | * @sumlabel Prefix to display in sum columns. Optional.
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| 25 | * @aggfn Aggregate function to use (could be AVG, SUM, COUNT)
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| 26 | * @showcount Show count of records
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| 27 | *
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| 28 | * @returns Sql generated
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| 29 | */
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| 30 |
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| 31 | function PivotTableSQL(&$db,$tables,$rowfields,$colfield, $where=false,
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| 32 | $aggfield = false,$sumlabel='Sum ',$aggfn ='SUM', $showcount = true)
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| 33 | {
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| 34 | if ($aggfield) $hidecnt = true;
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| 35 | else $hidecnt = false;
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| 36 |
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| 37 | $iif = strpos($db->databaseType,'access') !== false;
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| 38 | // note - vfp 6 still doesn' work even with IIF enabled || $db->databaseType == 'vfp';
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| 39 |
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| 40 | //$hidecnt = false;
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| 41 |
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| 42 | if ($where) $where = "\nWHERE $where";
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| 43 | if (!is_array($colfield)) $colarr = $db->GetCol("select distinct $colfield from $tables $where order by 1");
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| 44 | if (!$aggfield) $hidecnt = false;
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| 45 |
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| 46 | $sel = "$rowfields, ";
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| 47 | if (is_array($colfield)) {
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| 48 | foreach ($colfield as $k => $v) {
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| 49 | $k = trim($k);
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| 50 | if (!$hidecnt) {
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| 51 | $sel .= $iif ?
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| 52 | "\n\t$aggfn(IIF($v,1,0)) AS \"$k\", "
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| 53 | :
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| 54 | "\n\t$aggfn(CASE WHEN $v THEN 1 ELSE 0 END) AS \"$k\", ";
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| 55 | }
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| 56 | if ($aggfield) {
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| 57 | $sel .= $iif ?
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| 58 | "\n\t$aggfn(IIF($v,$aggfield,0)) AS \"$sumlabel$k\", "
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| 59 | :
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| 60 | "\n\t$aggfn(CASE WHEN $v THEN $aggfield ELSE 0 END) AS \"$sumlabel$k\", ";
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| 61 | }
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| 62 | }
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| 63 | } else {
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| 64 | foreach ($colarr as $v) {
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| 65 | if (!is_numeric($v)) $vq = $db->qstr($v);
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| 66 | else $vq = $v;
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| 67 | $v = trim($v);
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| 68 | if (strlen($v) == 0 ) $v = 'null';
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| 69 | if (!$hidecnt) {
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| 70 | $sel .= $iif ?
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| 71 | "\n\t$aggfn(IIF($colfield=$vq,1,0)) AS \"$v\", "
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| 72 | :
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| 73 | "\n\t$aggfn(CASE WHEN $colfield=$vq THEN 1 ELSE 0 END) AS \"$v\", ";
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| 74 | }
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| 75 | if ($aggfield) {
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| 76 | if ($hidecnt) $label = $v;
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| 77 | else $label = "{$v}_$aggfield";
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| 78 | $sel .= $iif ?
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| 79 | "\n\t$aggfn(IIF($colfield=$vq,$aggfield,0)) AS \"$label\", "
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| 80 | :
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| 81 | "\n\t$aggfn(CASE WHEN $colfield=$vq THEN $aggfield ELSE 0 END) AS \"$label\", ";
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| 82 | }
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| 83 | }
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| 84 | }
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| 85 | if ($aggfield && $aggfield != '1'){
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| 86 | $agg = "$aggfn($aggfield)";
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| 87 | $sel .= "\n\t$agg as \"$sumlabel$aggfield\", ";
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| 88 | }
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| 89 |
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| 90 | if ($showcount)
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| 91 | $sel .= "\n\tSUM(1) as Total";
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| 92 | else
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| 93 | $sel = substr($sel,0,strlen($sel)-2);
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| 94 |
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| 95 |
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| 96 | // Strip aliases
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| 97 | $rowfields = preg_replace('/ AS (\w+)/i', '', $rowfields);
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| 98 |
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| 99 | $sql = "SELECT $sel \nFROM $tables $where \nGROUP BY $rowfields";
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| 100 |
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| 101 | return $sql;
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| 102 | }
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| 103 |
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| 104 | /* EXAMPLES USING MS NORTHWIND DATABASE */
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| 105 | if (0) {
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| 106 |
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| 107 | # example1
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| 108 | #
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| 109 | # Query the main "product" table
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| 110 | # Set the rows to CompanyName and QuantityPerUnit
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| 111 | # and the columns to the Categories
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| 112 | # and define the joins to link to lookup tables
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| 113 | # "categories" and "suppliers"
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| 114 | #
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| 115 |
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| 116 | $sql = PivotTableSQL(
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| 117 | $gDB, # adodb connection
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| 118 | 'products p ,categories c ,suppliers s', # tables
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| 119 | 'CompanyName,QuantityPerUnit', # row fields
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| 120 | 'CategoryName', # column fields
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| 121 | 'p.CategoryID = c.CategoryID and s.SupplierID= p.SupplierID' # joins/where
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| 122 | );
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| 123 | print "<pre>$sql";
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| 124 | $rs = $gDB->Execute($sql);
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| 125 | rs2html($rs);
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| 126 |
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| 127 | /*
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| 128 | Generated SQL:
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| 129 |
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| 130 | SELECT CompanyName,QuantityPerUnit,
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| 131 | SUM(CASE WHEN CategoryName='Beverages' THEN 1 ELSE 0 END) AS "Beverages",
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| 132 | SUM(CASE WHEN CategoryName='Condiments' THEN 1 ELSE 0 END) AS "Condiments",
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| 133 | SUM(CASE WHEN CategoryName='Confections' THEN 1 ELSE 0 END) AS "Confections",
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| 134 | SUM(CASE WHEN CategoryName='Dairy Products' THEN 1 ELSE 0 END) AS "Dairy Products",
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| 135 | SUM(CASE WHEN CategoryName='Grains/Cereals' THEN 1 ELSE 0 END) AS "Grains/Cereals",
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| 136 | SUM(CASE WHEN CategoryName='Meat/Poultry' THEN 1 ELSE 0 END) AS "Meat/Poultry",
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| 137 | SUM(CASE WHEN CategoryName='Produce' THEN 1 ELSE 0 END) AS "Produce",
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| 138 | SUM(CASE WHEN CategoryName='Seafood' THEN 1 ELSE 0 END) AS "Seafood",
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| 139 | SUM(1) as Total
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| 140 | FROM products p ,categories c ,suppliers s WHERE p.CategoryID = c.CategoryID and s.SupplierID= p.SupplierID
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| 141 | GROUP BY CompanyName,QuantityPerUnit
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| 142 | */
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| 143 | //=====================================================================
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| 144 |
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| 145 | # example2
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| 146 | #
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| 147 | # Query the main "product" table
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| 148 | # Set the rows to CompanyName and QuantityPerUnit
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| 149 | # and the columns to the UnitsInStock for diiferent ranges
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| 150 | # and define the joins to link to lookup tables
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| 151 | # "categories" and "suppliers"
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| 152 | #
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| 153 | $sql = PivotTableSQL(
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| 154 | $gDB, # adodb connection
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| 155 | 'products p ,categories c ,suppliers s', # tables
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| 156 | 'CompanyName,QuantityPerUnit', # row fields
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| 157 | # column ranges
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| 158 | array(
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| 159 | ' 0 ' => 'UnitsInStock <= 0',
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| 160 | "1 to 5" => '0 < UnitsInStock and UnitsInStock <= 5',
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| 161 | "6 to 10" => '5 < UnitsInStock and UnitsInStock <= 10',
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| 162 | "11 to 15" => '10 < UnitsInStock and UnitsInStock <= 15',
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| 163 | "16+" =>'15 < UnitsInStock'
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| 164 | ),
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| 165 | ' p.CategoryID = c.CategoryID and s.SupplierID= p.SupplierID', # joins/where
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| 166 | 'UnitsInStock', # sum this field
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| 167 | 'Sum' # sum label prefix
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| 168 | );
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| 169 | print "<pre>$sql";
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| 170 | $rs = $gDB->Execute($sql);
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| 171 | rs2html($rs);
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| 172 | /*
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| 173 | Generated SQL:
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| 174 |
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| 175 | SELECT CompanyName,QuantityPerUnit,
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| 176 | SUM(CASE WHEN UnitsInStock <= 0 THEN UnitsInStock ELSE 0 END) AS "Sum 0 ",
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| 177 | SUM(CASE WHEN 0 < UnitsInStock and UnitsInStock <= 5 THEN UnitsInStock ELSE 0 END) AS "Sum 1 to 5",
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| 178 | SUM(CASE WHEN 5 < UnitsInStock and UnitsInStock <= 10 THEN UnitsInStock ELSE 0 END) AS "Sum 6 to 10",
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| 179 | SUM(CASE WHEN 10 < UnitsInStock and UnitsInStock <= 15 THEN UnitsInStock ELSE 0 END) AS "Sum 11 to 15",
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| 180 | SUM(CASE WHEN 15 < UnitsInStock THEN UnitsInStock ELSE 0 END) AS "Sum 16+",
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| 181 | SUM(UnitsInStock) AS "Sum UnitsInStock",
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| 182 | SUM(1) as Total
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| 183 | FROM products p ,categories c ,suppliers s WHERE p.CategoryID = c.CategoryID and s.SupplierID= p.SupplierID
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| 184 | GROUP BY CompanyName,QuantityPerUnit
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| 185 | */
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| 186 | }
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| 187 | ?> |
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