protected function Schema::ensureIdentifiersLength in Drupal 8

Same name and namespace in other branches

9 core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php \Drupal\Core\Database\Driver\pgsql\Schema::ensureIdentifiersLength()

Make sure to limit identifiers according to PostgreSQL compiled in length.

PostgreSQL allows in standard configuration identifiers no longer than 63 chars for table/relation names, indexes, primary keys, and constraints. So we map all identifiers that are too long to drupal_base64hash_tag, where tag is one of:

idx for indexes
key for constraints
pkey for primary keys
seq for sequences

Parameters

string $table_identifier_part: The first argument used to build the identifier string. This usually refers to a table/relation name.

string $column_identifier_part: The second argument used to build the identifier string. This usually refers to one or more column names.

string $tag: The identifier tag. It can be one of 'idx', 'key', 'pkey' or 'seq'.

string $separator: (optional) The separator used to glue together the aforementioned identifier parts. Defaults to '__'.

Return value

string The index/constraint/pkey identifier.

10 calls to Schema::ensureIdentifiersLength()

Schema::addPrimaryKey in core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php: Add a primary key.
Schema::addUniqueKey in core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php: Add a unique key.
Schema::constraintExists in core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php: Helper function: check if a constraint (PK, FK, UK) exists.
Schema::createTableSql in core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php: Generate SQL to create a new table from a Drupal schema definition.
Schema::dropIndex in core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php: Drop an index.

... See full list

File

core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php, line 74

Class

Schema: PostgreSQL implementation of \Drupal\Core\Database\Schema.

Namespace

Drupal\Core\Database\Driver\pgsql

Code

protected function ensureIdentifiersLength($table_identifier_part, $column_identifier_part, $tag, $separator = '__') {
  $info = $this
    ->getPrefixInfo($table_identifier_part);
  $table_identifier_part = $info['table'];
  $identifierName = implode($separator, [
    $table_identifier_part,
    $column_identifier_part,
    $tag,
  ]);

  // Retrieve the max identifier length which is usually 63 characters
  // but can be altered before PostgreSQL is compiled so we need to check.
  if (empty($this->maxIdentifierLength)) {
    $this->maxIdentifierLength = $this->connection
      ->query("SHOW max_identifier_length")
      ->fetchField();
  }
  if (strlen($identifierName) > $this->maxIdentifierLength) {
    $saveIdentifier = '"drupal_' . $this
      ->hashBase64($identifierName) . '_' . $tag . '"';
  }
  else {
    $saveIdentifier = $identifierName;
  }
  return $saveIdentifier;
}

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