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

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

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
 All rights reserved.
 
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     disclaimer. 
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     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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