public function Schema::renameTable in Drupal 8

Same name in this branch

8 core/lib/Drupal/Core/Database/Schema.php \Drupal\Core\Database\Schema::renameTable()
8 core/lib/Drupal/Core/Database/Driver/sqlite/Schema.php \Drupal\Core\Database\Driver\sqlite\Schema::renameTable()
8 core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php \Drupal\Core\Database\Driver\pgsql\Schema::renameTable()
8 core/lib/Drupal/Core/Database/Driver/mysql/Schema.php \Drupal\Core\Database\Driver\mysql\Schema::renameTable()

Same name and namespace in other branches

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

Rename a table.

Parameters

$table: The table to be renamed.

$new_name: The new name for the table.

Throws

\Drupal\Core\Database\SchemaObjectDoesNotExistException If the specified table doesn't exist.

\Drupal\Core\Database\SchemaObjectExistsException If a table with the specified new name already exists.

Overrides Schema::renameTable

File

core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php, line 550

Class

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

Namespace

Drupal\Core\Database\Driver\pgsql

Code

public function renameTable($table, $new_name) {
  if (!$this
    ->tableExists($table)) {
    throw new SchemaObjectDoesNotExistException("Cannot rename '{$table}' to '{$new_name}': table '{$table}' doesn't exist.");
  }
  if ($this
    ->tableExists($new_name)) {
    throw new SchemaObjectExistsException("Cannot rename '{$table}' to '{$new_name}': table '{$new_name}' already exists.");
  }

  // Get the schema and tablename for the old table.
  $old_full_name = $this->connection
    ->prefixTables('{' . $table . '}');
  list($old_schema, $old_table_name) = strpos($old_full_name, '.') ? explode('.', $old_full_name) : [
    'public',
    $old_full_name,
  ];

  // Index names and constraint names are global in PostgreSQL, so we need to
  // rename them when renaming the table.
  $indexes = $this->connection
    ->query('SELECT indexname FROM pg_indexes WHERE schemaname = :schema AND tablename = :table', [
    ':schema' => $old_schema,
    ':table' => $old_table_name,
  ]);
  foreach ($indexes as $index) {

    // Get the index type by suffix, e.g. idx/key/pkey
    $index_type = substr($index->indexname, strrpos($index->indexname, '_') + 1);

    // If the index is already rewritten by ensureIdentifiersLength() to not
    // exceed the 63 chars limit of PostgreSQL, we need to take care of that.
    // Example (drupal_Gk7Su_T1jcBHVuvSPeP22_I3Ni4GrVEgTYlIYnBJkro_idx).
    if (strpos($index->indexname, 'drupal_') !== FALSE) {
      preg_match('/^drupal_(.*)_' . preg_quote($index_type) . '/', $index->indexname, $matches);
      $index_name = $matches[1];
    }
    else {

      // Make sure to remove the suffix from index names, because
      // $this->ensureIdentifiersLength() will add the suffix again and thus
      // would result in a wrong index name.
      preg_match('/^' . preg_quote($old_full_name) . '__(.*)__' . preg_quote($index_type) . '/', $index->indexname, $matches);
      $index_name = $matches[1];
    }
    $this->connection
      ->query('ALTER INDEX "' . $index->indexname . '" RENAME TO ' . $this
      ->ensureIdentifiersLength($new_name, $index_name, $index_type) . '');
  }

  // Ensure the new table name does not include schema syntax.
  $prefixInfo = $this
    ->getPrefixInfo($new_name);

  // Rename sequences if the table contains serial fields.
  $info = $this
    ->queryTableInformation($table);
  if (!empty($info->serial_fields)) {
    foreach ($info->serial_fields as $field) {

      // The initial name of the sequence is generated automatically by
      // PostgreSQL when the table is created, so we need to use
      // pg_get_serial_sequence() to retrieve it.
      $old_sequence = $this->connection
        ->query("SELECT pg_get_serial_sequence('" . $old_full_name . "', '" . $field . "')")
        ->fetchField();

      // If the new sequence name exceeds the maximum identifier length limit,
      // it will not match the pattern that is automatically applied by
      // PostgreSQL on table creation, but that's ok because
      // pg_get_serial_sequence() will return our non-standard name on
      // subsequent table renames.
      $new_sequence = $this
        ->ensureIdentifiersLength($new_name, $field, 'seq', '_');
      $this->connection
        ->query('ALTER SEQUENCE ' . $old_sequence . ' RENAME TO ' . $new_sequence);
    }
  }

  // Now rename the table.
  $this->connection
    ->query('ALTER TABLE {' . $table . '} RENAME TO ' . $prefixInfo['table']);
  $this
    ->resetTableInformation($table);
}

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