db_add_primary_key($table, $fields)
Adds a primary key to a database table.
$table: Name of the table to be altered.
$fields: Array of fields for the primary key.
as of Drupal 8.0.x, will be removed in Drupal 9.0.0. Instead, get a database connection injected into your service from the container, get its schema driver, and call addPrimaryKey() on it. For example, $injected_database->schema()->addPrimaryKey($table, $fields);
\Drupal\Core\Database\Schema::addPrimaryKey()
function db_add_primary_key($table, $fields) { return Database::getConnection()->schema()->addPrimaryKey($table, $fields); }
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https://api.drupal.org/api/drupal/core!includes!database.inc/function/db_add_primary_key/8.1.x