https://api.drupal.org/api/drupal/includes%21database%21database.inc/function/DatabaseConnection%3A%3AescapeField/7.x
function DatabaseConnection::escapeField | Drupal API
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https://api.drupal.org/api/drupal/7.x/search/escapeField
Search for escapeField | Drupal API
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https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Database%21Query%21Select.php/function/Select%3A%3AescapeField/11.x
function Select::escapeField | Drupal API
functionselectdrupalapi