public function TruncateQuery::__toString
public TruncateQuery::__toString()
Implements PHP magic __toString method to convert the query to a string.
Return value
string The prepared statement.
Overrides Query::__toString
File
- includes/database/query.inc, line 942
- Non-specific Database query code. Used by all engines.
Class
- TruncateQuery
- General class for an abstracted TRUNCATE operation.
Code
public function __toString() { // Create a sanitized comment string to prepend to the query. $comments = $this->connection->makeComment($this->comments); // In most cases, TRUNCATE is not a transaction safe statement as it is a // DDL statement which results in an implicit COMMIT. When we are in a // transaction, fallback to the slower, but transactional, DELETE. // PostgreSQL also locks the entire table for a TRUNCATE strongly reducing // the concurrency with other transactions. if ($this->connection->inTransaction()) { return $comments . 'DELETE FROM {' . $this->connection->escapeTable($this->table) . '}'; } else { return $comments . 'TRUNCATE {' . $this->connection->escapeTable($this->table) . '} '; } }
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https://api.drupal.org/api/drupal/includes!database!query.inc/function/TruncateQuery::__toString/7.x