PHP SQLSelect::selectField方法代码示例

 /**
  * Augment the the SQLSelect that is created by the DataQuery
  * @todo Should this all go into VersionedDataQuery?
  */
 public function augmentSQL(SQLSelect $query, DataQuery $dataQuery = null)
 {
     if (!$dataQuery || !$dataQuery->getQueryParam('Versioned.mode')) {
         return;
     }
     $baseTable = ClassInfo::baseDataClass($dataQuery->dataClass());
     switch ($dataQuery->getQueryParam('Versioned.mode')) {
         // Reading a specific data from the archive
         case 'archive':
             $date = $dataQuery->getQueryParam('Versioned.date');
             foreach ($query->getFrom() as $table => $dummy) {
                 if (!DB::get_schema()->hasTable($table . '_versions')) {
                     continue;
                 }
                 $query->renameTable($table, $table . '_versions');
                 $query->replaceText("\"{$table}_versions\".\"ID\"", "\"{$table}_versions\".\"RecordID\"");
                 $query->replaceText("`{$table}_versions`.`ID`", "`{$table}_versions`.`RecordID`");
                 // Add all <basetable>_versions columns
                 foreach (Config::inst()->get('Versioned', 'db_for_versions_table') as $name => $type) {
                     $query->selectField(sprintf('"%s_versions"."%s"', $baseTable, $name), $name);
                 }
                 $query->selectField(sprintf('"%s_versions"."%s"', $baseTable, 'RecordID'), "ID");
                 if ($table != $baseTable) {
                     $query->addWhere("\"{$table}_versions\".\"Version\" = \"{$baseTable}_versions\".\"Version\"");
                 }
             }
             // Link to the version archived on that date
             $query->addWhere(array("\"{$baseTable}_versions\".\"Version\" IN\n\t\t\t\t(SELECT LatestVersion FROM\n\t\t\t\t\t(SELECT\n\t\t\t\t\t\t\"{$baseTable}_versions\".\"RecordID\",\n\t\t\t\t\t\tMAX(\"{$baseTable}_versions\".\"Version\") AS LatestVersion\n\t\t\t\t\t\tFROM \"{$baseTable}_versions\"\n\t\t\t\t\t\tWHERE \"{$baseTable}_versions\".\"LastEdited\" <= ?\n\t\t\t\t\t\tGROUP BY \"{$baseTable}_versions\".\"RecordID\"\n\t\t\t\t\t) AS \"{$baseTable}_versions_latest\"\n\t\t\t\t\tWHERE \"{$baseTable}_versions_latest\".\"RecordID\" = \"{$baseTable}_versions\".\"RecordID\"\n\t\t\t\t)" => $date));
             break;
             // Reading a specific stage (Stage or Live)
         // Reading a specific stage (Stage or Live)
         case 'stage':
             $stage = $dataQuery->getQueryParam('Versioned.stage');
             if ($stage && $stage != $this->defaultStage) {
                 foreach ($query->getFrom() as $table => $dummy) {
                     // Only rewrite table names that are actually part of the subclass tree
                     // This helps prevent rewriting of other tables that get joined in, in
                     // particular, many_many tables
                     if (class_exists($table) && ($table == $this->owner->class || is_subclass_of($table, $this->owner->class) || is_subclass_of($this->owner->class, $table))) {
                         $query->renameTable($table, $table . '_' . $stage);
                     }
                 }
             }
             break;
             // Reading a specific stage, but only return items that aren't in any other stage
         // Reading a specific stage, but only return items that aren't in any other stage
         case 'stage_unique':
             $stage = $dataQuery->getQueryParam('Versioned.stage');
             // Recurse to do the default stage behavior (must be first, we rely on stage renaming happening before
             // below)
             $dataQuery->setQueryParam('Versioned.mode', 'stage');
             $this->augmentSQL($query, $dataQuery);
             $dataQuery->setQueryParam('Versioned.mode', 'stage_unique');
             // Now exclude any ID from any other stage. Note that we double rename to avoid the regular stage rename
             // renaming all subquery references to be Versioned.stage
             foreach ($this->stages as $excluding) {
                 if ($excluding == $stage) {
                     continue;
                 }
                 $tempName = 'ExclusionarySource_' . $excluding;
                 $excludingTable = $baseTable . ($excluding && $excluding != $this->defaultStage ? "_{$excluding}" : '');
                 $query->addWhere('"' . $baseTable . '"."ID" NOT IN (SELECT "ID" FROM "' . $tempName . '")');
                 $query->renameTable($tempName, $excludingTable);
             }
             break;
             // Return all version instances
         // Return all version instances
         case 'all_versions':
         case 'latest_versions':
             foreach ($query->getFrom() as $alias => $join) {
                 if ($alias != $baseTable) {
                     $query->setJoinFilter($alias, "\"{$alias}\".\"RecordID\" = \"{$baseTable}_versions\".\"RecordID\"" . " AND \"{$alias}\".\"Version\" = \"{$baseTable}_versions\".\"Version\"");
                 }
                 $query->renameTable($alias, $alias . '_versions');
             }
             // Add all <basetable>_versions columns
             foreach (Config::inst()->get('Versioned', 'db_for_versions_table') as $name => $type) {
                 $query->selectField(sprintf('"%s_versions"."%s"', $baseTable, $name), $name);
             }
             // Alias the record ID as the row ID
             $query->selectField(sprintf('"%s_versions"."%s"', $baseTable, 'RecordID'), "ID");
             // Ensure that any sort order referring to this ID is correctly aliased
             $orders = $query->getOrderBy();
             foreach ($orders as $order => $dir) {
                 if ($order === "\"{$baseTable}\".\"ID\"") {
                     unset($orders[$order]);
                     $orders["\"{$baseTable}_versions\".\"RecordID\""] = $dir;
                 }
             }
             $query->setOrderBy($orders);
             // latest_version has one more step
             // Return latest version instances, regardless of whether they are on a particular stage
             // This provides "show all, including deleted" functonality
             if ($dataQuery->getQueryParam('Versioned.mode') == 'latest_versions') {
                 $query->addWhere("\"{$alias}_versions\".\"Version\" IN\n\t\t\t\t\t(SELECT LatestVersion FROM\n\t\t\t\t\t\t(SELECT\n\t\t\t\t\t\t\t\"{$alias}_versions\".\"RecordID\",\n\t\t\t\t\t\t\tMAX(\"{$alias}_versions\".\"Version\") AS LatestVersion\n\t\t\t\t\t\t\tFROM \"{$alias}_versions\"\n\t\t\t\t\t\t\tGROUP BY \"{$alias}_versions\".\"RecordID\"\n\t\t\t\t\t\t) AS \"{$alias}_versions_latest\"\n\t\t\t\t\t\tWHERE \"{$alias}_versions_latest\".\"RecordID\" = \"{$alias}_versions\".\"RecordID\"\n\t\t\t\t\t)");
             } else {
//.........这里部分代码省略.........

 /**
  * Select the given field expressions.
  *
  * @param $fieldExpression String The field to select (escaped SQL statement)
  * @param $alias String The alias of that field (escaped SQL statement)
  */
 protected function selectField($fieldExpression, $alias = null)
 {
     $this->query->selectField($fieldExpression, $alias);
 }

 public function testDbDatetimeDifference()
 {
     $offset = $this->checkPreconditions();
     $clause = $this->adapter->datetimeDifferenceClause('1974-10-14 10:30:00', '1973-10-14 10:30:00');
     $result = DB::query('SELECT ' . $clause)->value();
     $this->matchesRoughly($result / 86400, 365, '1974 - 1973 = 365 * 86400 sec', $offset);
     $clause = $this->adapter->datetimeDifferenceClause(date('Y-m-d H:i:s', strtotime('-15 seconds')), 'now');
     $result = DB::query('SELECT ' . $clause)->value();
     $this->matchesRoughly($result, -15, '15 seconds ago - now', $offset);
     $clause = $this->adapter->datetimeDifferenceClause('now', $this->adapter->datetimeIntervalClause('now', '+45 Minutes'));
     $result = DB::query('SELECT ' . $clause)->value();
     $this->matchesRoughly($result, -45 * 60, 'now - 45 minutes ahead', $offset);
     $query = new SQLSelect();
     $query->setSelect(array());
     $query->selectField($this->adapter->datetimeDifferenceClause('"LastEdited"', '"Created"'), 'test')->setFrom('"DbDateTimeTest_Team"')->setLimit(1);
     $result = $query->execute()->value();
     $lastedited = Dataobject::get_one('DbDateTimeTest_Team')->LastEdited;
     $created = Dataobject::get_one('DbDateTimeTest_Team')->Created;
     $this->matchesRoughly($result, strtotime($lastedited) - strtotime($created), 'age of HomePage record in seconds since unix epoc', $offset);
 }