Adds a field to the query table, possibly with an alias.

This will automatically call ensureTable to make sure the required table exists, *unless* $table is unset.

Parameters

$table: The table this field is attached to. If NULL, it is assumed this will be a formula; otherwise, ensureTable is used to make sure the table exists.

$field: The name of the field to add. This may be a real field or a formula.

$alias: The alias to create. If not specified, the alias will be $table_$field unless $table is NULL. When adding formulae, it is recommended that an alias be used.

$params: An array of parameters additional to the field that will control items such as aggregation functions and DISTINCT. Some values that are recognized:

• function: An aggregation function to apply, such as SUM.
• aggregate: Set to TRUE to indicate that this value should be aggregated in a GROUP BY.

Return value

string The name that this field can be referred to as. Usually this is the alias.

2 calls to Sql::addField()

Sql::addOrderBy in core/modules/views/src/Plugin/views/query/Sql.php

Add an ORDER BY clause to the query.

Sql::query in core/modules/views/src/Plugin/views/query/Sql.php

Generates a query and a countquery from all of the information supplied.

File

core/modules/views/src/Plugin/views/query/Sql.php, line 833

Class

Sql

Views query plugin for an SQL query.

Namespace

Drupal\views\Plugin\views\query

Code

public function addField($table, $field, $alias = '', $params = []) {
  // We check for this specifically because it gets a special alias.
  if ($table == $this->view->storage
    ->get('base_table') && $field == $this->view->storage
    ->get('base_field') && empty($alias)) {
    $alias = $this->view->storage
      ->get('base_field');
  }
  if ($table && empty($this->tableQueue[$table])) {
    $this->ensureTable($table);
  }
  if (!$alias && $table) {
    $alias = $table . '_' . $field;
  }
  // Make sure an alias is assigned
  $alias = $alias ? $alias : $field;
  // PostgreSQL truncates aliases to 63 characters:
  // https://www.drupal.org/node/571548.
  // We limit the length of the original alias up to 60 characters
  // to get a unique alias later if its have duplicates
  $alias = strtolower(substr($alias, 0, 60));
  // Create a field info array.
  $field_info = [
    'field' => $field,
    'table' => $table,
    'alias' => $alias,
  ] + $params;
  // Test to see if the field is actually the same or not. Due to
  // differing parameters changing the aggregation function, we need
  // to do some automatic alias collision detection:
  $base = $alias;
  $counter = 0;
  while (!empty($this->fields[$alias]) && $this->fields[$alias] != $field_info) {
    $field_info['alias'] = $alias = $base . '_' . ++$counter;
  }
  if (empty($this->fields[$alias])) {
    $this->fields[$alias] = $field_info;
  }
  // Keep track of all aliases used.
  $this->fieldAliases[$table][$field] = $alias;
  return $alias;
}

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