Class BDB::Cursor |
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A database cursor is a sequential pointer to the database entries. It allows traversal of the database and access to duplicate keyed entries. Cursors are used for operating on collections of records, for iterating over a database, and for saving handles to individual records, so that they can be modified after they have been read.
Methods |
Public Instance methods |
close() |
Discards the cursor.
c_close() |
same than close
count() |
Return the count of duplicate
c_count() |
same than count
current() |
Same than get(BDB::CURRENT)
c_current() |
same than current
del() |
Deletes the key/data pair currently referenced by the cursor.
delete() |
same than del
c_del() |
same than del
dup(flags = 0) |
Creates new cursor that uses the same transaction and locker ID as the original cursor. This is useful when an application is using locking and requires two or more cursors in the same thread of control.
flags can have the value BDB::DB_POSITION, in this case the newly created cursor is initialized to reference the same position in the database as the original cursor and hold the same locks.
clone(flags = 0) |
same than dup
c_dup(flags = 0) |
same than dup
c_clone(flags = 0) |
same than dup
first() |
Same than get(BDB::FIRST)
c_first() |
same than first
get(flags, key = nil, value = nil) |
Retrieve key/data pair from the database
See the description of c_get in the Berkeley distribution for the different values of the flags parameter.
key must be given if the flags parameter is BDB::SET | BDB::SET_RANGE | BDB::SET_RECNO
key and value must be specified for BDB::GET_BOTH
c_get(flags, key = nil, value = nil) |
same than get
last() |
Same than get(BDB::LAST)
c_last() |
same than last
next() |
Same than get(BDB::NEXT)
c_next() |
same than next
pget(flags, key = nil, value = nil) |
Retrieve key/primary key/data pair from the database
c_pget(flags, key = nil, value = nil) |
same than pget
prev() |
Same than get(BDB::PREV)
c_prev() |
same than prev
put(flags, value) |
Stores data value into the database.
See the description of c_put in the Berkeley distribution for the different values of the flags parameter.
c_put(flags, value) |
same than put
put(flags, key, value) |
Stores key/data pairs into the database (only for Btree and Hash access methods)
flags must have the value BDB::KEYFIRST or BDB::KEYLAST
c_put(flags, key, value) |
same than put
set(key) |
Same than get with the flags BDB::SET or BDB::SET_RANGE or BDB::SET_RECNO
c_set(key) |
same than set
set_range(key) |
same than set
c_set_range(key) |
same than set
set_recno(key) |
same than set
c_set_recno(key) |
same than set