Acces Methods¶ ↑
These are the methods for BDB::Recnum
Don't mix these methods with methods of BDB::Cursor
Class Methods¶ ↑
open(name = nil, subname = nil, flags = 0, mode = 0, options = {})
create(name = nil, subname = nil, flags = 0, mode = 0, options = {})
new(name = nil, subname = nil, flags = 0, mode = 0, options = {})
-
open the database
BDB::Recnum.open(name, subname, flags, mode) is equivalent to BDB::Recno.open(name, subname, flags, mode, "set_flags" => BDB::RENUMBER, "set_array_base" => 0)
remove(name, subname = nil)
db_remove(name, subname = nil)
unlink(name, subname = nil)
-
Removes the database (or subdatabase) represented by the name and subname combination.
If no subdatabase is specified, the physical file represented by name is removed, incidentally removing all subdatabases that it contained.
upgrade(name)
db_upgrade(name)
-
Upgrade the database
Methods¶ ↑
All this methods has the same syntax than for the class Array
self[nth]
-
retrieves the
nth
item from an array. Index starts from zero. If index is the negative, counts backward from the end of the array. The index of the last element is -1. Returnsnil
, if thenth
element is not exist in the array. self[start..end]
-
returns an array containing the objects from
start
toend
, including both ends. if end is larger than the length of the array, it will be rounded to the length. Ifstart
is out of an array range , returnsnil
. And ifstart
is larger than end with in array range, returns empty array ([]). self[start, length]
-
returns an array containing
length
items fromstart
. Returnsnil
iflength
is negative. self[nth] = val
-
changes the
nth
element of the array intoval
. Ifnth
is larger than array length, the array shall be extended automatically. Extended region shall be initialized bynil
. self[start..end] = val
-
replace the items from
start
toend
withval
. Ifval
is not an array, the type ofval
will be converted into the Array usingto_a
method. self[start, length] = val
-
replace the
length
items fromstart
withval
. Ifval
is not an array, the type ofval
will be converted into the Array usingto_a
. self + other
-
concatenation
self * times
-
repetition
self - other
-
substraction
self & other
-
returns a new array which contains elements belong to both elements.
self | other
-
join
self << obj
-
append a new item with value
obj
. Returnself
self <=> other
-
comparison : return -1, 0 or 1
clear
-
delete all elements
collect {|item| ..}
-
Returns a new array by invoking block once for every element, passing each element as a parameter to block. The result of block is used as the given element
collect! {|item| ..}
-
invokes block once for each element of db, replacing the element with the value returned by block.
concat(other)
-
append
other
to the end delete(val)
-
delete the item which matches to
val
delete_at(pos)
-
delete the item at
pos
delete_if {|x| ...}
-
delete the item if the block return
true
reject!{|x|...}
-
delete the item if the block return
true
each {|x| ...}
-
iterate over each item
each_index {|i| ...}
-
iterate over each index
empty?
-
return
true
if the db file is empty fill(val)
-
set the entire db with
val
fill(val, start[, length])
-
fill the db with
val
fromstart
fill(val, start..end)
-
set the db with
val
fromstart
toend
include?(val)
-
returns true if the given
val
is present index(val)
-
returns the index of the item which equals to
val
. If no item found, returnsnil
indexes(index_1,..., index_n)
-
returns an array consisting of elements at the given indices
indices(index_1,..., index_n)
-
returns an array consisting of elements at the given indices
join([sep])
-
returns a string created by converting each element to a string
length
size
-
return the number of elements of the db file
nitems
-
return the number of non-nil elements of the db file
pop
-
pops and returns the last value
push(obj...)
-
appends obj
replace(other)
-
replaces the contents of the db file with the contents of
other
reverse
-
returns the array of the items in reverse order
reverse!
-
replaces the items in reverse order.
reverse_each {|x| ...}
-
iterate over each item in reverse order
rindex(val)
-
returns the index of the last item which verify +item == val+
shift
-
remove and return the first element
to_a
to_ary
-
return an
Array
with all elements unshift(obj)
-
insert
obj
to the front of the db file