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XXII. DB++ Functions

Avertissement

Ce module est EXPERIMENTAL. Cela signifie que le comportement de ces fonctions, leurs noms et concrètement, TOUT ce qui est documenté ici peut changer dans un futur proche, SANS PREAVIS! Soyez-en conscient, et utiliser ce module à vos risques et périls.

DB++ Database Functions

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 then 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.

Requirements

You need the development libraries and header files included in every db++ installation archive. Concept asa provides additional documentation and Demo versions of db++ for Linux, some other UNIX versions and Windows95/NT.

Installation

Creation and installation of this extension requires the db++ client libraries and header files to be installed on your system. 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.

db++ error codes

Tableau 1. DB++ Error Codes

PHP Constant	db++ constant	meaning
DBPLUS_ERR_NOERR	ERR_NOERR	Null error condition
DBPLUS_ERR_DUPLICATE	ERR_DUPLICATE	Tried to insert a duplicate tuple
DBPLUS_ERR_EOSCAN	ERR_EOSCAN	End of scan from rget()
DBPLUS_ERR_EMPTY	ERR_EMPTY	Relation is empty (server)
DBPLUS_ERR_CLOSE	ERR_CLOSE	The server can't close
DBPLUS_ERR_WLOCKED	ERR_WLOCKED	The record is write locked
DBPLUS_ERR_LOCKED	ERR_LOCKED	Relation was already locked
DBPLUS_ERR_NOLOCK	ERR_NOLOCK	Relation cannot be locked
DBPLUS_ERR_READ	ERR_READ	Read error on relation
DBPLUS_ERR_WRITE	ERR_WRITE	Write error on relation
DBPLUS_ERR_CREATE	ERR_CREATE	Create() system call failed
DBPLUS_ERR_LSEEK	ERR_LSEEK	Lseek() system call failed
DBPLUS_ERR_LENGTH	ERR_LENGTH	Tuple exceeds maximum length
DBPLUS_ERR_OPEN	ERR_OPEN	Open() system call failed
DBPLUS_ERR_WOPEN	ERR_WOPEN	Relation already opened for writing
DBPLUS_ERR_MAGIC	ERR_MAGIC	File is not a relation
DBPLUS_ERR_VERSION	ERR_VERSION	File is a very old relation
DBPLUS_ERR_PGSIZE	ERR_PGSIZE	Relation uses a different page size
DBPLUS_ERR_CRC	ERR_CRC	Invalid crc in the superpage
DBPLUS_ERR_PIPE	ERR_PIPE	Piped relation requires lseek()
DBPLUS_ERR_NIDX	ERR_NIDX	Too many secondary indices
DBPLUS_ERR_MALLOC	ERR_MALLOC	Malloc() call failed
DBPLUS_ERR_NUSERS	ERR_NUSERS	Error use of max users
DBPLUS_ERR_PREEXIT	ERR_PREEXIT	Caused by invalid usage
DBPLUS_ERR_ONTRAP	ERR_ONTRAP	Caused by a signal
DBPLUS_ERR_PREPROC	ERR_PREPROC	Error in the preprocessor
DBPLUS_ERR_DBPARSE	ERR_DBPARSE	Error in the parser
DBPLUS_ERR_DBRUNERR	ERR_DBRUNERR	Run error in db
DBPLUS_ERR_DBPREEXIT	ERR_DBPREEXIT	Exit condition caused by prexit() * procedure
DBPLUS_ERR_WAIT	ERR_WAIT	Wait a little (Simple only)
DBPLUS_ERR_CORRUPT_TUPLE	ERR_CORRUPT_TUPLE	A client sent a corrupt tuple
DBPLUS_ERR_WARNING0	ERR_WARNING0	The Simple routines encountered a non fatal error which was corrected
DBPLUS_ERR_PANIC	ERR_PANIC	The server should not really die but after a disaster send ERR_PANIC to all its clients
DBPLUS_ERR_FIFO	ERR_FIFO	Can't create a fifo
DBPLUS_ERR_PERM	ERR_PERM	Permission denied
DBPLUS_ERR_TCL	ERR_TCL	TCL_error
DBPLUS_ERR_RESTRICTED	ERR_RESTRICTED	Only two users
DBPLUS_ERR_USER	ERR_USER	An error in the use of the library by an application programmer
DBPLUS_ERR_UNKNOWN	ERR_UNKNOWN

Table des matières
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 a id number unique to a relation
dbplus_info -- ???
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_rkeys -- Specify new primary key for a relation
dbplus_restorepos -- ???
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 -- ???
dbplus_setindex -- ???
dbplus_setindexbynumber -- ???
dbplus_sql -- Perform SQL query
dbplus_tcl -- Execute TCL code on server side
dbplus_tremove -- Remove tuple and return new current tuple
dbplus_undo -- ???
dbplus_undoprepare -- ???
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


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