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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
* set of functions used for normalization
*
* @package PhpMyAdmin
*/
if (! defined('PHPMYADMIN')) {
exit;
}
/**
* build the html for columns of $colTypeCategory category
* in form of given $listType in a table
*
* @param string $db current database
* @param string $table current table
* @param string $colTypeCategory supported all|Numeric|String|Spatial
* |Date and time using the _pgettext() format
* @param string $listType type of list to build, supported dropdown|checkbox
*
* @return HTML for list of columns in form of given list types
*/
function PMA_getHtmlForColumnsList(
$db, $table, $colTypeCategory='all', $listType='dropdown'
) {
$columnTypeList = array();
if ($colTypeCategory != 'all') {
$types = $GLOBALS['PMA_Types']->getColumns();
$columnTypeList = $types[$colTypeCategory];
}
$GLOBALS['dbi']->selectDb($db, $GLOBALS['userlink']);
$columns = (array) $GLOBALS['dbi']->getColumns(
$db, $table, null,
true, $GLOBALS['userlink']
);
$type = "";
$selectColHtml = "";
foreach ($columns as $column => $def) {
if (isset($def['Type'])) {
$extracted_columnspec = PMA_Util::extractColumnSpec($def['Type']);
$type = $extracted_columnspec['type'];
}
if (empty($columnTypeList)
|| in_array(/*overload*/mb_strtoupper($type), $columnTypeList)
) {
if ($listType == 'checkbox') {
$selectColHtml .= '<input type="checkbox" value="'
. htmlspecialchars($column) . '"/>'
. htmlspecialchars($column) . ' [ '
. htmlspecialchars($def['Type']) . ' ]</br>';
} else {
$selectColHtml .= '<option value="' . htmlspecialchars($column) . ''
. '">' . htmlspecialchars($column)
. ' [ ' . htmlspecialchars($def['Type']) . ' ]'
. '</option>';
}
}
}
return $selectColHtml;
}
/**
* get the html of the form to add the new column to given table
*
* @param integer $num_fields number of columns to add
* @param string $db current database
* @param string $table current table
* @param array $columnMeta array containing default values for the fields
*
* @return HTML
*/
function PMA_getHtmlForCreateNewColumn(
$num_fields, $db, $table, $columnMeta=array()
) {
$cfgRelation = PMA_getRelationsParam();
$content_cells = array();
$available_mime = array();
$mime_map = array();
$header_cells = PMA_getHeaderCells(
true, null,
$cfgRelation['mimework'], $db, $table
);
if ($cfgRelation['mimework'] && $GLOBALS['cfg']['BrowseMIME']) {
$mime_map = PMA_getMIME($db, $table);
$available_mime = PMA_getAvailableMIMEtypes();
}
$comments_map = PMA_getComments($db, $table);
for ($columnNumber = 0; $columnNumber < $num_fields; $columnNumber++) {
$content_cells[$columnNumber] = PMA_getHtmlForColumnAttributes(
$columnNumber, $columnMeta, '',
8, '', null, array(), null, null,
$comments_map, null, true,
array(), $cfgRelation,
isset($available_mime)?$available_mime:array(), $mime_map
);
}
return PMA_getHtmlForTableFieldDefinitions($header_cells, $content_cells);
}
/**
* build the html for step 1.1 of normalization
*
* @param string $db current database
* @param string $table current table
* @param string $normalizedTo up to which step normalization will go,
* possible values 1nf|2nf|3nf
*
* @return HTML for step 1.1
*/
function PMA_getHtmlFor1NFStep1($db, $table, $normalizedTo)
{
$step = 1;
$stepTxt = __('Make all columns atomic');
$html = "<h3 class='center'>"
. __('First step of normalization (1NF)') . "</h3>";
$html .= "<div id='mainContent' data-normalizeto='" . $normalizedTo . "'>" .
"<fieldset>" .
"<legend>" . __('Step 1.') . $step . " " . $stepTxt . "</legend>" .
"<h4>" . __(
'Do you have any column which can be split into more than'
. ' one column? '
. 'For example: address can be split into street, city, country and zip.'
)
. "</br>(<a class='central_columns_dialog' data-maxrows='25' "
. "data-pick=false href='#'> "
. __(
'Show me the central list of columns that are not already in this table'
) . " </a>)</h4>"
. "<p class='cm-em'>" . __(
'Select a column which can be split into more '
. 'than one. (on select of \'no such column\', it\'ll move to next step)'
)
. "</p>"
. "<div id='extra'>"
. "<select id='selectNonAtomicCol' name='makeAtomic'>"
. '<option selected="selected" disabled="disabled">'
. __('Select one…') . "</option>"
. "<option value='no_such_col'>" . __('No such column') . "</option>"
. PMA_getHtmlForColumnsList(
$db,
$table,
_pgettext('string types', 'String')
)
. "</select>"
. "<span>" . __('split into ')
. "</span><input id='numField' type='number' value='2'>"
. "<input type='submit' id='splitGo' value='" . __('Go') . "'/></div>"
. "<div id='newCols'></div>"
. "</fieldset><fieldset class='tblFooters'>"
. "</fieldset>"
. "</div>";
return $html;
}
/**
* build the html contents of various html elements in step 1.2
*
* @param string $db current database
* @param string $table current table
*
* @return HTML contents for step 1.2
*/
function PMA_getHtmlContentsFor1NFStep2($db, $table)
{
$step = 2;
$stepTxt = __('Have a primary key');
$primary = PMA_Index::getPrimary($table, $db);
$hasPrimaryKey = "0";
$legendText = __('Step 1.') . $step . " " . $stepTxt;
$extra = '';
if ($primary) {
$headText = __("Primary key already exists.");
$subText = __("Taking you to next step…");
$hasPrimaryKey = "1";
} else {
$headText = __(
"There is no primary key; please add one.<br/>"
. "Hint: A primary key is a column "
. "(or combination of columns) that uniquely identify all rows."
);
$subText = '<a href="#" id="createPrimaryKey">'
. PMA_Util::getIcon(
'b_index_add.png', __(
'Add a primary key on existing column(s)'
)
)
. '</a>';
$extra = __(
"If it's not possible to make existing "
. "column combinations as primary key"
) . "<br/>"
. '<a href="#" id="addNewPrimary">'
. __('+ Add a new primary key column') . '</a>';
}
$res = array('legendText'=>$legendText, 'headText'=>$headText,
'subText'=>$subText, 'hasPrimaryKey'=>$hasPrimaryKey, 'extra'=>$extra);
return $res;
}
/**
* build the html contents of various html elements in step 1.4
*
* @param string $db current database
* @param string $table current table
*
* @return HTML contents for step 1.4
*/
function PMA_getHtmlContentsFor1NFStep4($db, $table)
{
$step = 4;
$stepTxt = __('Remove redundant columns');
$legendText = __('Step 1.') . $step . " " . $stepTxt;
$headText = __(
"Do you have a group of columns which on combining gives an existing"
. " column? For example, if you have first_name, last_name and"
. " full_name then combining first_name and last_name gives full_name"
. " which is redundant."
);
$subText = __(
"Check the columns which are redundant and click on remove. "
. "If no redundant column, click on 'No redundant column'"
);
$extra = PMA_getHtmlForColumnsList($db, $table, 'all', "checkbox") . "</br>"
. '<input type="submit" id="removeRedundant" value="'
. __('Remove selected') . '"/>'
. '<input type="submit" value="' . __('No redundant column')
. '" onclick="goToFinish1NF();"'
. '/>';
$res = array(
'legendText'=>$legendText, 'headText'=>$headText,
'subText'=>$subText, 'extra'=>$extra
);
return $res;
}
/**
* build the html contents of various html elements in step 1.3
*
* @param string $db current database
* @param string $table current table
*
* @return HTML contents for step 1.3
*/
function PMA_getHtmlContentsFor1NFStep3($db, $table)
{
$step = 3;
$stepTxt = __('Move repeating groups');
$legendText = __('Step 1.') . $step . " " . $stepTxt;
$headText = __(
"Do you have a group of two or more columns that are closely "
. "related and are all repeating the same attribute? For example, "
. "a table that holds data on books might have columns such as book_id, "
. "author1, author2, author3 and so on which form a "
. "repeating group. In this case a new table (book_id, author) should "
. "be created."
);
$subText = __(
"Check the columns which form a repeating group. "
. "If no such group, click on 'No repeating group'"
);
$extra = PMA_getHtmlForColumnsList($db, $table, 'all', "checkbox") . "</br>"
. '<input type="submit" id="moveRepeatingGroup" value="'
. __('Done') . '"/>'
. '<input type="submit" value="' . __('No repeating group')
. '" onclick="goToStep4();"'
. '/>';
$primary = PMA_Index::getPrimary($table, $db);
$primarycols = $primary->getColumns();
$pk = array();
foreach ($primarycols as $col) {
$pk[] = $col->getName();
}
$res = array(
'legendText'=>$legendText, 'headText'=>$headText,
'subText'=>$subText, 'extra'=>$extra, 'primary_key'=> json_encode($pk)
);
return $res;
}
/**
* build html contents for 2NF step 2.1
*
* @param string $db current database
* @param string $table current table
*
* @return HTML contents for 2NF step 2.1
*/
function PMA_getHtmlFor2NFstep1($db, $table)
{
$legendText = __('Step 2.') . "1 " . __('Find partial dependencies');
$primary = PMA_Index::getPrimary($table, $db);
$primarycols = $primary->getColumns();
$pk = array();
$subText = '';
$selectPkForm = "";
$extra = "";
foreach ($primarycols as $col) {
$pk[] = $col->getName();
$selectPkForm .= '<input type="checkbox" name="pd" value="'
. htmlspecialchars($col->getName()) . '">'
. htmlspecialchars($col->getName());
}
$key = implode(', ', $pk);
if (count($primarycols) > 1) {
$GLOBALS['dbi']->selectDb($db, $GLOBALS['userlink']);
$columns = (array) $GLOBALS['dbi']->getColumnNames(
$db, $table, $GLOBALS['userlink']
);
if (count($pk) == count($columns)) {
$headText = sprintf(
__(
'No partial dependencies possible as '
. 'no non-primary column exists since primary key ( %1$s ) '
. 'is composed of all the columns in the table.'
), htmlspecialchars($key)
) . '<br/>';
$extra = '<h3>' . __('Table is already in second normal form.')
. '</h3>';
} else {
$headText = sprintf(
__(
'The primary key ( %1$s ) consists of more than one column '
. 'so we need to find the partial dependencies.'
), htmlspecialchars($key)
) . '<br/>' . __(
'Please answer the following question(s) '
. 'carefully to obtain a correct normalization.'
)
. '<br/><a href="#" id="showPossiblePd">' . __(
'+ Show me the possible partial dependencies '
. 'based on data in the table'
) . '</a>';
$subText = __(
'For each column below, '
. 'please select the <b>minimal set</b> of columns among given set '
. 'whose values combined together are sufficient'
. ' to determine the value of the column.'
);
$cnt=0;
foreach ($columns as $column) {
if (!in_array($column, $pk)) {
$cnt++;
$extra .= "<b>" . sprintf(
__('\'%1$s\' depends on:'), htmlspecialchars($column)
) . "</b><br>";
$extra .= '<form id="pk_' . $cnt . '" data-colname="'
. htmlspecialchars($column) . '" class="smallIndent">'
. $selectPkForm . '</form><br/><br/>';
}
}
}
} else {
$headText = sprintf(
__(
'No partial dependencies possible as the primary key'
. ' ( %1$s ) has just one column.'
), htmlspecialchars($key)
) . '<br/>';
$extra = '<h3>' . __('Table is already in second normal form.') . '</h3>';
}
$res = array(
'legendText'=>$legendText, 'headText'=>$headText,
'subText'=>$subText,'extra'=>$extra, 'primary_key'=> $key
);
return $res;
}
/**
* build the html for showing the tables to have in order to put current table in 2NF
*
* @param array $partialDependencies array containing all the dependencies
* @param string $table current table
*
* @return HTML
*/
function PMA_getHtmlForNewTables2NF($partialDependencies,$table)
{
$html = '<p><b>' . sprintf(
__(
'In order to put the '
. 'original table \'%1$s\' into Second normal form we need '
. 'to create the following tables:'
), htmlspecialchars($table)
) . '</b></p>';
$tableName = $table;
$i=1;
foreach ($partialDependencies as $key=>$dependents) {
$html .= '<p><input type="text" name="' . htmlspecialchars($key)
. '" value="' . htmlspecialchars($tableName) . '"/>'
. '( <u>' . htmlspecialchars($key) . '</u>'
. (count($dependents)>0?', ':'')
. htmlspecialchars(implode(', ', $dependents)) . ' )';
$i++;
$tableName = 'table' . $i;
}
return $html;
}
/**
* create/alter the tables needed for 2NF
*
* @param array $partialDependencies array containing all the partial dependencies
* @param object $tablesName name of new tables
* @param string $table current table
* @param string $db current database
*
* @return array
*/
function PMA_createNewTablesFor2NF($partialDependencies, $tablesName, $table, $db)
{
$dropCols = false;
$nonPKCols = array();
$queries = array();
$error = false;
$headText = '<h3>' . sprintf(
__('The second step of normalization is complete for table \'%1$s\'.'),
htmlspecialchars($table)
) . '</h3>';
if (count((array)$partialDependencies) == 1) {
return array(
'legendText'=>__('End of step'), 'headText'=>$headText,
'queryError'=>$error
);
}
$message = '';
$GLOBALS['dbi']->selectDb($db, $GLOBALS['userlink']);
foreach ($partialDependencies as $key=>$dependents) {
if ($tablesName->$key != $table) {
$backquotedKey = implode(', ', PMA_Util::backquote(explode(', ', $key)));
$queries[] = 'CREATE TABLE ' . PMA_Util::backquote($tablesName->$key)
. ' SELECT DISTINCT ' . $backquotedKey
. (count($dependents)>0?', ':'')
. implode(',', PMA_Util::backquote($dependents))
. ' FROM ' . PMA_Util::backquote($table) . ';';
$queries[] = 'ALTER TABLE ' . PMA_Util::backquote($tablesName->$key)
. ' ADD PRIMARY KEY(' . $backquotedKey . ');';
$nonPKCols = array_merge($nonPKCols, $dependents);
} else {
$dropCols = true;
}
}
if ($dropCols) {
$query = 'ALTER TABLE ' . PMA_Util::backquote($table);
foreach ($nonPKCols as $col) {
$query .= ' DROP ' . PMA_Util::backquote($col) . ',';
}
$query = trim($query, ', ');
$query .= ';';
$queries[] = $query;
} else {
$queries[] = 'DROP TABLE ' . PMA_Util::backquote($table);
}
foreach ($queries as $query) {
if (!$GLOBALS['dbi']->tryQuery($query, $GLOBALS['userlink'])) {
$message = PMA_Message::error(__('Error in processing!'));
$message->addMessage('<br /><br />');
$message->addMessage(
PMA_Message::rawError(
$GLOBALS['dbi']->getError($GLOBALS['userlink'])
)
);
$error = true;
break;
}
}
return array(
'legendText'=>__('End of step'), 'headText'=>$headText,
'queryError'=>$error, 'extra'=>$message
);
}
/**
* build the html for showing the new tables to have in order
* to put given tables in 3NF
*
* @param object $dependencies containing all the dependencies
* @param array $tables tables formed after 2NF and need to convert to 3NF
* @param string $db current database
*
* @return array containing html and the list of new tables
*/
function PMA_getHtmlForNewTables3NF($dependencies, $tables, $db)
{
$html = "";
$i=1;
$newTables = array();
foreach ($tables as $table=>$arrDependson) {
if (count(array_unique($arrDependson)) == 1) {
continue;
}
$primary = PMA_Index::getPrimary($table, $db);
$primarycols = $primary->getColumns();
$pk = array();
foreach ($primarycols as $col) {
$pk[] = $col->getName();
}
$html .= '<p><b>' . sprintf(
__(
'In order to put the '
. 'original table \'%1$s\' into Third normal form we need '
. 'to create the following tables:'
), htmlspecialchars($table)
) . '</b></p>';
$tableName = $table;
$columnList = array();
foreach ($arrDependson as $key) {
$dependents = $dependencies->$key;
if ($key == $table) {
$key = implode(', ', $pk);
}
$tmpTableCols =array_merge(explode(', ', $key), $dependents);
sort($tmpTableCols);
if (!in_array($tmpTableCols, $columnList)) {
$columnList[] = $tmpTableCols;
$html .= '<p><input type="text" name="'
. htmlspecialchars($tableName)
. '" value="' . htmlspecialchars($tableName) . '"/>'
. '( <u>' . htmlspecialchars($key) . '</u>'
. (count($dependents)>0?', ':'')
. htmlspecialchars(implode(', ', $dependents)) . ' )';
$newTables[$table][$tableName] = array(
"pk"=>$key, "nonpk"=>implode(', ', $dependents)
);
$i++;
$tableName = 'table' . $i;
}
}
}
return array('html'=>$html, 'newTables'=>$newTables);
}
/**
* create new tables or alter existing to get 3NF
*
* @param array $newTables list of new tables to be created
* @param string $db current database
*
* @return array
*/
function PMA_createNewTablesFor3NF($newTables, $db)
{
$queries = array();
$dropCols = false;
$error = false;
$headText = '<h3>' .
__('The third step of normalization is complete.')
. '</h3>';
if (count((array)$newTables) == 0) {
return array(
'legendText'=>__('End of step'), 'headText'=>$headText,
'queryError'=>$error
);
}
$message = '';
$GLOBALS['dbi']->selectDb($db, $GLOBALS['userlink']);
foreach ($newTables as $originalTable=>$tablesList) {
foreach ($tablesList as $table=>$cols) {
if ($table != $originalTable) {
$quotedPk = implode(
', ', PMA_Util::backquote(explode(', ', $cols->pk))
);
$quotedNonpk = implode(
', ', PMA_Util::backquote(explode(', ', $cols->nonpk))
);
$queries[] = 'CREATE TABLE ' . PMA_Util::backquote($table)
. ' SELECT DISTINCT ' . $quotedPk
. ', ' . $quotedNonpk
. ' FROM ' . PMA_Util::backquote($originalTable) . ';';
$queries[] = 'ALTER TABLE ' . PMA_Util::backquote($table)
. ' ADD PRIMARY KEY(' . $quotedPk . ');';
} else {
$dropCols = $cols;
}
}
if ($dropCols) {
$columns = (array) $GLOBALS['dbi']->getColumnNames(
$db, $originalTable, $GLOBALS['userlink']
);
$colPresent = array_merge(
explode(', ', $dropCols->pk), explode(', ', $dropCols->nonpk)
);
$query = 'ALTER TABLE ' . PMA_Util::backquote($originalTable);
foreach ($columns as $col) {
if (!in_array($col, $colPresent)) {
$query .= ' DROP ' . PMA_Util::backquote($col) . ',';
}
}
$query = trim($query, ', ');
$query .= ';';
$queries[] = $query;
} else {
$queries[] = 'DROP TABLE ' . PMA_Util::backquote($originalTable);
}
$dropCols = false;
}
foreach ($queries as $query) {
if (!$GLOBALS['dbi']->tryQuery($query, $GLOBALS['userlink'])) {
$message = PMA_Message::error(__('Error in processing!'));
$message->addMessage('<br /><br />');
$message->addMessage(
PMA_Message::rawError(
$GLOBALS['dbi']->getError($GLOBALS['userlink'])
)
);
$error = true;
break;
}
}
return array(
'legendText'=>__('End of step'), 'headText'=>$headText,
'queryError'=>$error, 'extra'=>$message
);
}
/**
* move the repeating group of columns to a new table
*
* @param string $repeatingColumns comma separated list of repeating group columns
* @param string $primary_columns comma separated list of column in primary key
* of $table
* @param string $newTable name of the new table to be created
* @param string $newColumn name of the new column in the new table
* @param string $table current table
* @param string $db current database
*
* @return array
*/
function PMA_moveRepeatingGroup(
$repeatingColumns, $primary_columns, $newTable, $newColumn, $table, $db
) {
$repeatingColumnsArr = (array)PMA_Util::backquote(
explode(', ', $repeatingColumns)
);
$primary_columns = implode(
',', PMA_Util::backquote(explode(',', $primary_columns))
);
$query1 = 'CREATE TABLE ' . PMA_Util::backquote($newTable);
$query2 = 'ALTER TABLE ' . PMA_Util::backquote($table);
$message = PMA_Message::success(
sprintf(
__('Selected repeating group has been moved to the table \'%s\''),
htmlspecialchars($table)
)
);
$first = true;
$error = false;
foreach ($repeatingColumnsArr as $repeatingColumn) {
if (!$first) {
$query1 .= ' UNION ';
}
$first = false;
$query1 .= ' SELECT ' . $primary_columns . ',' . $repeatingColumn
. ' as ' . PMA_Util::backquote($newColumn)
. ' FROM ' . PMA_Util::backquote($table);
$query2 .= ' DROP ' . $repeatingColumn . ',';
}
$query2 = trim($query2, ',');
$queries = array($query1, $query2);
$GLOBALS['dbi']->selectDb($db, $GLOBALS['userlink']);
foreach ($queries as $query) {
if (!$GLOBALS['dbi']->tryQuery($query, $GLOBALS['userlink'])) {
$message = PMA_Message::error(__('Error in processing!'));
$message->addMessage('<br /><br />');
$message->addMessage(
PMA_Message::rawError(
$GLOBALS['dbi']->getError($GLOBALS['userlink'])
)
);
$error = true;
break;
}
}
return array(
'queryError'=>$error, 'message'=>$message
);
}
/**
* build html for 3NF step 1 to find the transitive dependencies
*
* @param string $db current database
* @param array $tables tables formed after 2NF and need to process for 3NF
*
* @return string
*/
function PMA_getHtmlFor3NFstep1($db, $tables)
{
$legendText = __('Step 3.') . "1 " . __('Find transitive dependencies');
$extra = "";
$headText = __(
'Please answer the following question(s) '
. 'carefully to obtain a correct normalization.'
);
$subText = __(
'For each column below, '
. 'please select the <b>minimal set</b> of columns among given set '
. 'whose values combined together are sufficient'
. ' to determine the value of the column.<br />'
. 'Note: A column may have no transitive dependency, '
. 'in that case you don\'t have to select any.'
);
$cnt=0;
foreach ($tables as $key=>$table) {
$primary = PMA_Index::getPrimary($table, $db);
$primarycols = $primary->getColumns();
$selectTdForm = "";
$pk = array();
foreach ($primarycols as $col) {
$pk[] = $col->getName();
}
$GLOBALS['dbi']->selectDb($db, $GLOBALS['userlink']);
$columns = (array) $GLOBALS['dbi']->getColumnNames(
$db, $table, $GLOBALS['userlink']
);
if (count($columns)-count($pk)<=1) {
continue;
}
foreach ($columns as $column) {
if (!in_array($column, $pk)) {
$selectTdForm .= '<input type="checkbox" name="pd" value="'
. htmlspecialchars($column) . '">'
. '<span>' . htmlspecialchars($column) . '</span>';
}
}
foreach ($columns as $column) {
if (!in_array($column, $pk)) {
$cnt++;
$extra .= "<b>" . sprintf(
__('\'%1$s\' depends on:'), htmlspecialchars($column)
)
. "</b><br>";
$extra .= '<form id="td_' . $cnt . '" data-colname="'
. htmlspecialchars($column) . '" data-tablename="'
. htmlspecialchars($table) . '" class="smallIndent">'
. $selectTdForm
. '</form><br/><br/>';
}
}
}
if ($extra == "") {
$headText = __(
"No Transitive dependencies possible as the table "
. "doesn't have any non primary key columns"
);
$subText = "";
$extra = "<h3>" . __("Table is already in Third normal form!") . "</h3>";
}
$res = array(
'legendText'=>$legendText, 'headText'=>$headText,
'subText'=>$subText,'extra'=>$extra
);
return $res;
}
/**
* get html for options to normalize table
*
* @return HTML
*/
function PMA_getHtmlForNormalizetable()
{
$html_output = '<form method="post" action="normalization.php" '
. 'name="normalize" '
. 'id="normalizeTable" '
. '>'
. PMA_URL_getHiddenInputs($GLOBALS['db'], $GLOBALS['table'])
. '<input type="hidden" name="step1" value="1">';
$html_output .= '<fieldset>';
$html_output .= '<legend>'
. __('Improve table structure (Normalization):') . '</legend>';
$html_output .= '<h3>' . __('Select up to what step you want to normalize') . '</h3>';
$choices = array(
'1nf' => __('First step of normalization (1NF)'),
'2nf' => __('Second step of normalization (1NF+2NF)'),
'3nf' => __('Third step of normalization (1NF+2NF+3NF)'));
$html_output .= PMA_Util::getRadioFields(
'normalizeTo', $choices, '1nf', true
);
$html_output .= '</fieldset><fieldset class="tblFooters">'
. "<span class='floatleft'>" . __(
'Hint: Please follow the procedure carefully in order '
. 'to obtain correct normalization'
) . "</span>"
. '<input type="submit" name="submit_normalize" value="' . __('Go') . '" />'
. '</fieldset>'
. '</form>'
. '</div>';
return $html_output;
}
/**
* find all the possible partial dependencies based on data in the table.
*
* @param string $table current table
* @param string $db current database
*
* @return HTML containing the list of all the possible partial dependencies
*/
function PMA_findPartialDependencies($table, $db)
{
$dependencyList = array();
$GLOBALS['dbi']->selectDb($db, $GLOBALS['userlink']);
$columns = (array) $GLOBALS['dbi']->getColumnNames(
$db, $table, $GLOBALS['userlink']
);
$columns = (array)PMA_Util::backquote($columns);
$totalRowsRes = $GLOBALS['dbi']->fetchResult(
'SELECT COUNT(*) FROM (SELECT * FROM '
. PMA_Util::backquote($table) . ' LIMIT 500) as dt;'
);
$totalRows = $totalRowsRes[0];
$primary = PMA_Index::getPrimary($table, $db);
$primarycols = $primary->getColumns();
$pk = array();
foreach ($primarycols as $col) {
$pk[] = PMA_Util::backquote($col->getName());
}
$partialKeys = PMA_getAllCombinationPartialKeys($pk);
$distinctValCount = PMA_findDistinctValuesCount(
array_unique(
array_merge($columns, $partialKeys)
), $table
);
foreach ($columns as $column) {
if (!in_array($column, $pk)) {
foreach ($partialKeys as $partialKey) {
if ($partialKey
&& PMA_checkPartialDependency(
$partialKey, $column, $table,
$distinctValCount[$partialKey],
$distinctValCount[$column], $totalRows
)
) {
$dependencyList[$partialKey][] = $column;
}
}
}
}
$html = __(
'This list is based on a subset of the table\'s data '
. 'and is not necessarily accurate. '
)
. '<div class="dependencies_box">';
foreach ($dependencyList as $dependon=>$colList) {
$html .= '<span class="displayblock">'
. '<input type="button" class="pickPd" value="' . __('Pick') . '"/>'
. '<span class="determinants">'
. htmlspecialchars(str_replace('`', '', $dependon)) . '</span> -> '
. '<span class="dependents">'
. htmlspecialchars(str_replace('`', '', implode(', ', $colList)))
. '</span>'
. '</span>';
}
if (empty($dependencyList)) {
$html .= '<p class="displayblock desc">'
. __('No partial dependencies found!') . '</p>';
}
$html .= '</div>';
return $html;
}
/**
* check whether a particular column is dependent on given subset of primary key
*
* @param string $partialKey the partial key, subset of primary key,
* each column in key supposed to be backquoted
* @param string $column backquoted column on whose dependency being checked
* @param string $table current table
* @param integer $pkCnt distinct value count for given partial key
* @param integer $colCnt distinct value count for given column
* @param integer $totalRows total distinct rows count of the table
*
* @return boolean TRUE if $column is dependent on $partialKey, False otherwise
*/
function PMA_checkPartialDependency(
$partialKey, $column, $table, $pkCnt, $colCnt, $totalRows
) {
$query = 'SELECT '
. 'COUNT(DISTINCT ' . $partialKey . ',' . $column . ') as pkColCnt '
. 'FROM (SELECT * FROM ' . PMA_Util::backquote($table)
. ' LIMIT 500) as dt' . ';';
$res = $GLOBALS['dbi']->fetchResult($query, null, null, $GLOBALS['userlink']);
$pkColCnt = $res[0];
if ($pkCnt && $pkCnt == $colCnt && $colCnt == $pkColCnt) {
return true;
}
if ($totalRows && $totalRows == $pkCnt) {
return true;
}
return false;
}
/**
* function to get distinct values count of all the column in the array $columns
*
* @param array $columns array of backquoted columns whose distinct values
* need to be counted.
* @param string $table table to which these columns belong
*
* @return array associative array containing the count
*/
function PMA_findDistinctValuesCount($columns, $table)
{
$result = array();
$query = 'SELECT ';
foreach ($columns as $column) {
if ($column) { //each column is already backquoted
$query .= 'COUNT(DISTINCT ' . $column . ') as \''
. $column . '_cnt\', ';
}
}
$query = trim($query, ', ');
$query .= ' FROM (SELECT * FROM ' . PMA_Util::backquote($table)
. ' LIMIT 500) as dt' . ';';
$res = $GLOBALS['dbi']->fetchResult($query, null, null, $GLOBALS['userlink']);
foreach ($columns as $column) {
if ($column) {
$result[$column] = isset($res[0][$column . '_cnt']) ? $res[0][$column . '_cnt'] : null;
}
}
return $result;
}
/**
* find all the possible partial keys
*
* @param array $primaryKey array containing all the column present in primary key
*
* @return array containing all the possible partial keys(subset of primary key)
*/
function PMA_getAllCombinationPartialKeys($primaryKey)
{
$results = array('');
foreach ($primaryKey as $element) {
foreach ($results as $combination) {
array_push(
$results, trim($element . ',' . $combination, ',')
);
}
}
array_pop($results); //remove key which consist of all primary key columns
return $results;
}
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