chickadee » tokyocabinet

tokyocabinet

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, 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

tc-hdb-open FILE #!key FLAGS TUNE-OPTS MUTEX? NUM-BUCKETS RECORD-ALIGNMENT NUM-FREE-BLOCKS CACHE-LIMIT MMAP-SIZEprocedure

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).

TC_HDBOWRITERconstant
TC_HDBOREADERconstant
TC_HDBOCREATconstant
TC_HDBOTRUNCconstant
TC_HDBONOLCKconstant
TC_HDBOLCKNBconstant

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

tc-hdb-close

tc-hdb-close HDBprocedure

Closes and frees the database handle.

tc-hdb-put!

tc-hdb-put! HDB KEY VALUEprocedure

Put (KEY, VALUE) into hash database HDB.

tc-hdb-delete!

tc-hdb-delete! HDB KEYprocedure

Delete KEY from hash database HDB.

tc-hdb-get

tc-hdb-get HDB KEYprocedure

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

tc-hdb-vsize

tc-hdb-vsize HDB KEYprocedure

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

tc-hdb-iter-init

tc-hdb-iter-init HDBprocedure

tc-hdb-iter-next

tc-hdb-iter-next HDBprocedure

Returns a STRING

tc-hdb-fold

tc-hdb-fold HDB KONS KNILprocedure

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

tc-hdb-ecode

tc-hdb-ecode HDBprocedure

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

tc-bdb-open

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-SIZEprocedure

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).

TC_BDBOWRITERconstant
TC_BDBOREADERconstant
TC_BDBOCREATconstant
TC_BDBOTRUNCconstant
TC_BDBONOLCKconstant
TC_BDBOLCKNBconstant

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

tc-bdb-close

tc-bdb-close BDBprocedure

tc-bdb-get

tc-bdb-get BDB KEYprocedure

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

tc-bdb-ecode

tc-bdb-ecode BDBprocedure

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

tc-tdb-open

tc-tdb-open TDB #!key FLAGS MUTEX? NUM-BUCKETS RECORD-ALIGNMENT NUM-FREE-BLOCKS TUNE-OPTS CACHE-LIMIT LEAF-CACHE NON-LEAF-CACHE MMAP-SIZEprocedure

Returns a TDB object as a c-pointer.

tc-tdb-close

tc-tdb-close TDBprocedure

Closes the table database TDB.

tc-tdb-get-tabcols

tc-tdb-get-tabcols TDB KEYprocedure

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

tc-tdb-vsize TDB KEYprocedure

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

tc-tdb-ecode

tc-tdb-ecode TDBprocedure

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

License

 Copyright (c) 2008-2011, Alex Shinn
 All rights reserved.
 
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