A nested array of values to insert.
$insertValues is an array of arrays. Each sub-array is either an associative array whose keys are field names and whose values are field values to insert, or a non-associative array of values in the same order as $insertFields.
Whether multiple insert sets will be run in a single query or multiple queries is left to individual drivers to implement in whatever manner is most appropriate. The order of values in each sub-array must match the order of fields in $insertFields.
Type: array
protected $insertValues = array();