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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