DB++ Functions

Warnung

Diese Erweiterung ist EXPERIMENTELL. Das Verhalten dieser Erweiterung, einschließlich der Funktionsnamen, und alles Andere was hier dokumentiert ist, kann sich in zukünftigen PHP-Versionen ohne Ankündigung ändern. Seien Sie gewarnt und verwenden Sie diese Erweiterung auf eigenes Risiko.

Einführung

db++, made by the German company » Concept asa, is a relational database system with high performance and low memory and disk usage in mind. While providing SQL as an additional language interface, it is not really a SQL database in the first place but provides its own AQL query language which is much more influenced by the relational algebra than SQL is.

Concept asa always had an interest in supporting open source languages, db++ has had Perl and Tcl call interfaces for years now and uses Tcl as its internal stored procedure language.

Anforderungen

This extension relies on external client libraries so you have to have a db++ client installed on the system you want to use this extension on.

» Concept asa provides » db++ Demo versions and » documentation for Linux, some other Unix versions. There is also a Windows version of db++, but this extension doesn't support it (yet).

Installation

In order to build this extension yourself you need the db++ client libraries and header files to be installed on your system (these are included in the db++ installation archives by default). You have to run configure with option --with-dbplus to build this extension.

configure looks for the client libraries and header files under the default paths /usr/dbplus, /usr/local/dbplus and /opt/dblus. If you have installed db++ in a different place you have add the installation path to the configure option like this: --with-dbplus=/your/installation/path.

Laufzeit Konfiguration

Diese Erweiterung definiert keine Konfigurationseinstellungen in der php.ini.

Resource Typen

dbplus_relation

Most db++ functions operate on or return dbplus_relation resources. A dbplus_relation is a handle to a stored relation or a relation generated as the result of a query.

Vordefinierte Konstanten

Folgende Konstanten werden von dieser Erweiterung definiert und stehen nur zur Verfügung, wenn die Erweiterung entweder statisch in PHP kompiliert oder dynamisch zur Laufzeit geladen wurde.

db++ error codes

DB++ Error Codes

PHP Constant db++ constant meaning

DBPLUS_ERR_NOERR (integer) ERR_NOERR Null error condition

DBPLUS_ERR_DUPLICATE (integer) ERR_DUPLICATE Tried to insert a duplicate tuple

DBPLUS_ERR_EOSCAN (integer) ERR_EOSCAN End of scan from rget()

DBPLUS_ERR_EMPTY (integer) ERR_EMPTY Relation is empty (server)

DBPLUS_ERR_CLOSE (integer) ERR_CLOSE The server can't close

DBPLUS_ERR_WLOCKED (integer) ERR_WLOCKED The record is write locked

DBPLUS_ERR_LOCKED (integer) ERR_LOCKED Relation was already locked

DBPLUS_ERR_NOLOCK (integer) ERR_NOLOCK Relation cannot be locked

DBPLUS_ERR_READ (integer) ERR_READ Read error on relation

DBPLUS_ERR_WRITE (integer) ERR_WRITE Write error on relation

DBPLUS_ERR_CREATE (integer) ERR_CREATE Create() system call failed

DBPLUS_ERR_LSEEK (integer) ERR_LSEEK Lseek() system call failed

DBPLUS_ERR_LENGTH (integer) ERR_LENGTH Tuple exceeds maximum length

DBPLUS_ERR_OPEN (integer) ERR_OPEN Open() system call failed

DBPLUS_ERR_WOPEN (integer) ERR_WOPEN Relation already opened for writing

DBPLUS_ERR_MAGIC (integer) ERR_MAGIC File is not a relation

DBPLUS_ERR_VERSION (integer) ERR_VERSION File is a very old relation

DBPLUS_ERR_PGSIZE (integer) ERR_PGSIZE Relation uses a different page size

DBPLUS_ERR_CRC (integer) ERR_CRC Invalid crc in the superpage

DBPLUS_ERR_PIPE (integer) ERR_PIPE Piped relation requires lseek()

DBPLUS_ERR_NIDX (integer) ERR_NIDX Too many secondary indices

DBPLUS_ERR_MALLOC (integer) ERR_MALLOC Malloc() call failed

DBPLUS_ERR_NUSERS (integer) ERR_NUSERS Error use of max users

DBPLUS_ERR_PREEXIT (integer) ERR_PREEXIT Caused by invalid usage

DBPLUS_ERR_ONTRAP (integer) ERR_ONTRAP Caused by a signal

DBPLUS_ERR_PREPROC (integer) ERR_PREPROC Error in the preprocessor

DBPLUS_ERR_DBPARSE (integer) ERR_DBPARSE Error in the parser

DBPLUS_ERR_DBRUNERR (integer) ERR_DBRUNERR Run error in db

DBPLUS_ERR_DBPREEXIT (integer) ERR_DBPREEXIT Exit condition caused by prexit() * procedure

DBPLUS_ERR_WAIT (integer) ERR_WAIT Wait a little (Simple only)

DBPLUS_ERR_CORRUPT_TUPLE (integer) ERR_CORRUPT_TUPLE A client sent a corrupt tuple

DBPLUS_ERR_WARNING0 (integer) ERR_WARNING0 The Simple routines encountered a non fatal error which was corrected

DBPLUS_ERR_PANIC (integer) ERR_PANIC The server should not really die but after a disaster send ERR_PANIC to all its clients

DBPLUS_ERR_FIFO (integer) ERR_FIFO Can't create a fifo

DBPLUS_ERR_PERM (integer) ERR_PERM Permission denied

DBPLUS_ERR_TCL (integer) ERR_TCL TCL_error

DBPLUS_ERR_RESTRICTED (integer) ERR_RESTRICTED Only two users

DBPLUS_ERR_USER (integer) ERR_USER An error in the use of the library by an application programmer

DBPLUS_ERR_UNKNOWN (integer) ERR_UNKNOWN

Inhaltsverzeichnis

dbplus_add — Add a tuple to a relation
dbplus_aql — Perform AQL query
dbplus_chdir — Get/Set database virtual current directory
dbplus_close — Close a relation
dbplus_curr — Get current tuple from relation
dbplus_errcode — Get error string for given errorcode or last error
dbplus_errno — Get error code for last operation
dbplus_find — Set a constraint on a relation
dbplus_first — Get first tuple from relation
dbplus_flush — Flush all changes made on a relation
dbplus_freealllocks — Free all locks held by this client
dbplus_freelock — Release write lock on tuple
dbplus_freerlocks — Free all tuple locks on given relation
dbplus_getlock — Get a write lock on a tuple
dbplus_getunique — Get an id number unique to a relation
dbplus_info — Get information about a relation
dbplus_last — Get last tuple from relation
dbplus_lockrel — Request write lock on relation
dbplus_next — Get next tuple from relation
dbplus_open — Open relation file
dbplus_prev — Get previous tuple from relation
dbplus_rchperm — Change relation permissions
dbplus_rcreate — Creates a new DB++ relation
dbplus_rcrtexact — Creates an exact but empty copy of a relation including indices
dbplus_rcrtlike — Creates an empty copy of a relation with default indices
dbplus_resolve — Resolve host information for relation
dbplus_restorepos — Restore position
dbplus_rkeys — Specify new primary key for a relation
dbplus_ropen — Open relation file local
dbplus_rquery — Perform local (raw) AQL query
dbplus_rrename — Rename a relation
dbplus_rsecindex — Create a new secondary index for a relation
dbplus_runlink — Remove relation from filesystem
dbplus_rzap — Remove all tuples from relation
dbplus_savepos — Save position
dbplus_setindex — Set index
dbplus_setindexbynumber — Set index by number
dbplus_sql — Perform SQL query
dbplus_tcl — Execute TCL code on server side
dbplus_tremove — Remove tuple and return new current tuple
dbplus_undo — Undo
dbplus_undoprepare — Prepare undo
dbplus_unlockrel — Give up write lock on relation
dbplus_unselect — Remove a constraint from relation
dbplus_update — Update specified tuple in relation
dbplus_xlockrel — Request exclusive lock on relation
dbplus_xunlockrel — Free exclusive lock on relation