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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 developement libraries and header files included in every db++ installaion 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 pathes `/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 |

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