tokyocabinet

  1. tokyocabinet
    1. Description
    2. Author
    3. Requirements
    4. Documentation
      1. tc-hdb-open
      2. tc-hdb-close
      3. tc-hdb-put!
      4. tc-hdb-delete!
      5. tc-hdb-get
      6. tc-hdb-iter-init
      7. tc-hdb-iter-next
      8. tc-hdb-fold
      9. tc-tdb-open
      10. tc-tdb-close
      11. tc-tdb-get-tabcols
      12. tc-tdb-vsize
    5. Limitations
    6. Changelog
    7. License

Description

Tokyo Cabinet DBM bindings for Chicken.

Author

Alex Shinn

Requirements

No eggs are required but you must have tokyocabinet installed on your OS.

Documentation

The following flags and procedures are defined (currently only APIs for the hash database and the table database is provided - B-trees and fixed-length databases may be provided later). For more information, consult the tokyocabinet(3) manual pages.

tc-hdb-open

[procedure] (tc-hdb-open FILE #!key FLAGS TUNE-OPTS MUTEX? NUM-BUCKETS RECORD-ALIGNMENT NUM-FREE-BLOCKS CACHE-LIMIT MMAP-SIZE)

Returns a HDB object as a c-pointer. FLAGS specifies creation and locking behavior; by default files are opened for reading (TC_HDBOREADER), writing (TC_HDBOWRITER) and creating (TC_HDBOCREAT).

TUNE-OPTS, along with the other keywords specify options to the tchdbtune function. MUTEX? opens the file under mutex mode (as with tchdbsetmutex).

[constant] TC_HDBOWRITER
[constant] TC_HDBOREADER
[constant] TC_HDBOCREAT
[constant] TC_HDBOTRUNC
[constant] TC_HDBONOLCK
[constant] TC_HDBOLCKNB

These flags to tc-hdb-open specify creation and locking behavior.

tc-hdb-close

[procedure] (tc-hdb-close HDB)

Closes and frees the database handle.

tc-hdb-put!

[procedure] (tc-hdb-put! HDB KEY VALUE)

Put (KEY, VALUE) into hash database HDB.

tc-hdb-delete!

[procedure] (tc-hdb-delete! HDB KEY)

Delete KEY from hash database HDB.

tc-hdb-get

[procedure] (tc-hdb-get HDB KEY)

Returns the string VALUE associated with KEY in hash database HDB, or #f if KEY does not exist.

tc-hdb-iter-init

[procedure] (tc-hdb-iter-init HDB)

tc-hdb-iter-next

[procedure] (tc-hdb-iter-next HDB)

Returns a STRING

tc-hdb-fold

[procedure] (tc-hdb-fold HDB KONS KNIL)

Returns the accumulated result. Specify ALIST-CONS for the KONS to get an alist representation of the database.

tc-tdb-open

[procedure] (tc-tdb-open TDB #!key FLAGS MUTEX? NUM-BUCKETS RECORD-ALIGNMENT NUM-FREE-BLOCKS TUNE-OPTS CACHE-LIMIT LEAF-CACHE NON-LEAF-CACHE MMAP-SIZE)

Returns a TDB object as a c-pointer.

tc-tdb-close

[procedure] (tc-tdb-close TDB)

Closes the table database TDB.

tc-tdb-get-tabcols

[procedure] (tc-tdb-get-tabcols TDB KEY)

The attribute-value pairs for key KEY from table database TDB as one string with tab character as separator: attr1 TAB val1 TAB attr2 TAB val2 ...

tc-tdb-vsize

[procedure] (tc-tdb-vsize TDB KEY)

The size of the value for KEY (measured in bytes).

Limitations

Procedures which accept or return strings, such as tc-hdb-get and tc-hdb-put, are subject to the maximum string length limit imposed by Chicken. On 32-bit platforms, this is 16 megabytes. On a 64-bit platform, it is 72 petabytes. If you try to store or retrieve objects exceeding this limit, an error will occur.

For unknown reasons, table databases cannot be opened if mmap-size is greater than 0.

Changelog

License

 Copyright (c) 2008-2011, Alex Shinn
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following
 conditions are met:
 
   Redistributions of source code must retain the above copyright notice, this list of conditions and the following
     disclaimer. 
   Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
     disclaimer in the documentation and/or other materials provided with the distribution. 
   Neither the name of the author nor the names of its contributors may be used to endorse or promote
     products derived from this software without specific prior written permission. 
 
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