public function Schema::queryFieldInformation

Fetch the list of CHECK constraints used on a field.

We introspect the database to collect the information required by field alteration.

Parameters

$table: The non-prefixed name of the table.

$field: The name of the field.

Return value

An array of all the checks for the field.

File

drupal/core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php, line 97

Definition of Drupal\Core\Database\Driver\pgsql\Schema

Class

Schema

Namespace

Code

public function queryFieldInformation($table, $field) {
  $prefixInfo = $this
    ->getPrefixInfo($table, TRUE);

  // Split the key into schema and table for querying.
  $schema = $prefixInfo['schema'];
  $table_name = $prefixInfo['table'];
  $field_information = (object) array(
    'checks' => array(),
  );
  $checks = $this->connection
    ->query("SELECT conname FROM pg_class cl INNER JOIN pg_constraint co ON co.conrelid = cl.oid INNER JOIN pg_attribute attr ON attr.attrelid = cl.oid AND attr.attnum = ANY (co.conkey) INNER JOIN pg_namespace ns ON cl.relnamespace = ns.oid WHERE co.contype = 'c' AND ns.nspname = :schema AND cl.relname = :table AND attr.attname = :column", array(
    ':schema' => $schema,
    ':table' => $table_name,
    ':column' => $field,
  ));
  $field_information = $checks
    ->fetchCol();
  return $field_information;
}