tokyocabinet

Requirements

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

The following flags and procedures are defined (currently, the APIs for the hash database (hdb), the B-tree database (bdb), and the table database (tdb) are provided; 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-vsize

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

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

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-hdb-ecode

[procedure] (tc-hdb-ecode HDB)

Returns the error code from the last tc-hdb operation. 0 means no error.

tc-bdb-open

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

Returns a BDB object as a c-pointer. FLAGS specifies creation and locking behavior; by default files are opened for reading (TC_BDBOREADER), writing (TC_BDBOWRITER) and creating (TC_BDBOCREAT).

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

[constant] TC_BDBOWRITER
[constant] TC_BDBOREADER
[constant] TC_BDBOCREAT
[constant] TC_BDBOTRUNC
[constant] TC_BDBONOLCK
[constant] TC_BDBOLCKNB

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

tc-bdb-close

[procedure] (tc-bdb-close BDB)

tc-bdb-get

[procedure] (tc-bdb-get BDB KEY)

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

tc-bdb-ecode

[procedure] (tc-bdb-ecode BDB)

Returns the error code from the last tc-bdb operation. 0 means no error.

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).

tc-tdb-ecode

[procedure] (tc-tdb-ecode TDB)

Returns the error code from the last tc-tdb operation. 0 means no error.

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

1.0 Initial release
2.01 some extensions for the table database
2.02 Some fixes and extensions for the table database.

License

 Copyright (c) 2008-2011, Alex Shinn
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