$result_set = $class->result($terms, $args)¶

This method is actually defined in Data::ObjectDriver::BaseObject but it is the way a new ResultSet object is created.

Arguments:

$terms - A hashref. Same format as the first argument to Data::ObjectDriver::DBI::search

$args - A hashref. Same format as the second argument to Data::ObjectDriver::DBI::search

Return value:

This method returns a Data::ObjectDriver::ResultSet object

$new_result = Data::ObjectDriver::ResultSet->iterator(\@data)¶

Create a new result set object that takes existing data and operates only as an iterator, without any of the query management.

Arguments:

$data - An array ref of data elements

Return value:

A Data::ObjectDriver::ResultSet object

add_constraint¶

Apply a constraint to the result. The format of the two arguments is the same as for Data::ObjectDriver::DBI::search

Arguments:

$terms - A hashref of object fields and values constraining them. Same as first parameter to result method.

$args - A hashref of values that affect the returned data, such as limit and sort by. Same as first parameter to result method.

; Return value : Returns 1 if successful and 0 otherwise

; Notes : Do we fail if called after we've retrieved the result set? Ignore it? Requery?

; Example

  $res->add_constraint({object_id => $id}, {limit => 100})

add_term¶

Apply a single search term to the result. Equivalent to:

  $res->add_constraint($terms)

Arguments:

$terms - A hashref of object fields and values constraining them

; Return value : Returns 1 if successful and 0 otherwise

; Notes : Same question as for add_constraint

; Example

  $res->add_term({object_id => $id})

clear_term¶

Clear a single search term from the result.

Arguments:

@terms - An array of term names to clear

; Return value : Returns 1 if successful and 0 otherwise

; Notes : none

; Example

  $res->clear_term(qw(limit offset))

add_limit¶

Apply a limit to the result. Equivalent to:

  $res->add_constraint({}, {limit => $limit})

Arguments:

$limit - A scalar numeric value giving the limit of the number of objects returned

; Return value : Returns 1 if successful and 0 otherwise

; Notes :

; Example

  $res->add_limit(100)

clear_limit¶

Clear any limit value in the result.

Arguments:

none

; Return value : Returns 1 if successful and 0 otherwise

; Notes : None

; Example

  $res->clear_limit

add_offset¶

Add an offset for the results returned. Result set must also have a limit set at some point.

Arguments:

$offset - A scalar numeric value giving the offset for the first object returned

; Return value : Returns 1 if successful and 0 otherwise

; Notes : none

; Example

  $res->add_offset(5_000)

clear_offset¶

Clear any offset value in the result.

Arguments:

none

; Return value : Returns 1 if successful and 0 otherwise

; Notes :

; Example

  $res->clear_offset

add_order¶

Add a sort order for the results returned.

Arguments:

[0] = $order = - A scalar string value giving the sort order for the results, one of ascend or descend

; Return value : Returns 1 if successful and 0 otherwise

; Notes : >none''

; Example

  $res->add_order('ascend')

clear_order¶

Clear any offset value in the result.

Arguments:

none

; Return value : Returns 1 if successful and 0 otherwise

; Notes : none

; Example

  $res->clear_order

index¶

Return the current index into the result set.

Arguments:

none

; Return value : An integer giving the zero based index of the current element in the result set.

; Notes : none

; Example

  $idx = $res->index;

next¶

Retrieve the next item in the resultset

Arguments:

none

; Return value : The next object or undef if past the end of the result set

; Notes : Calling this method will force a DB query. All subsequent calls to curr will return this object

; Example

  $obj = $res->next;

peek_next¶

Retrieve the next item in the resultset WITHOUT advancing the cursor.

Arguments:

none

; Return value : The next object or undef if past the end of the result set

; Notes : Calling this method will force a DB query. All subsequent calls to curr will return this object

; Example

  while ($bottle = $res->next){
      if ($bottle->type eq 'Bud Light'
          && $res->peek_next->type eq 'Chimay'){
          $bottle->pass; #don't spoil my palate
      }else{
          $bottle->drink;
      }
  }

prev¶

Retrieve the previous item in the result set

Arguments:

none

; Return value : The previous object or undef if before the beginning of the result set

; Notes : All subsequent calls to curr will return this object

; Example

  $obj = $res->prev;

curr¶

Retrieve the current item in the result set. This item is set by calls to next and prev

Arguments:

none

; Return value : The current object or undef if past the boundaries of the result set

; Notes : none

; Example

  $obj = $res->curr

slice¶

Return a slice of the result set. This is logically equivalent to setting a limit and offset and then retrieving all the objects via -next>. If you call slice and then call next, you will get undef and additionally is_finished will be true.

Arguments:

$from - Scalar integer giving the start of the slice range

$to - Scalar integer giving the end of the slice range

; Return value : An array of objects

; Notes : Objects are index from 0 just like perl arrays.

; Example

  my @objs = $res->slice(0, 20)

count¶

Get the count of the items in the result set.

Arguments:

none

; Return value : A scalar count of the number of items in the result set

; Notes : This will cause a count() query on the database if the result set hasn't been retrieved yet. If the result set has been retrieved it will just return the number of objects stored in the result set object.

; Example

  $num = $res->count

is_finished¶

Returns whether we've arrived at the end of the result set

Arguments:

none

; Return value : Returns 1 if we are finished iterating though the result set and 0 otherwise

; Notes : none

; Example

  while (not $res->is_finished) {
      my $obj = $res->next;
      # Stuff ...
  }

dod_debug¶

Set this and you'll see $Data::ObjectDriver::DEBUG output when I go to get the results.

rewind¶

Move back to the start of the iterator for this instance of results of a query.

first¶

Returns the first object in the result set.

Arguments:

none

; Return value : The first object in the result set

; Notes : Resets the current cursor so that calls to curr return this value.

; Example

  $obj = $res->first

last¶

Returns the last object in the result set.

Arguments:

none

; Return value : The last object in the result set

; Notes : Resets the current cursor so that calls to curr return this value.

; Example

  $obj = $res->last

is_last¶

Returns 1 if the cursor is on the last row of the result set, 0 if it is not.

Arguments:

none

; Return value : Returns 1 if the cursor is on the last row of the result set, 0 if it is not.

; Example

  if ( $res->is_last ) {
     ## do some stuff
  }