Podręcznik PHP
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# CX. Paradox File Access

# Wstęp

Ostrzeżenie
Ten moduł jest w stadium EKSPERYMENTALNYM. Oznacza to, że zachowanie tych funkcji, ich nazwy, w zasadzie wszystko udokumentowane tutaj może zostać zmienione w przyszłych wersjach PHP bez wcześniejszego uprzedzenia. Używaj tego modułu na własne ryzyko.

This module allows to read and write Paradox databases, primary index files and blob files. Write support has been proven to be quite reliable, though due to lack of documentation the produced files may not in any case be readable by other applications. Encrypted databases can be read without specifying a password if pxlib >= 0.5.0 is used.

> Notatka: This module is also in development and may change, though I don't expect major changes to the API.

# Wymagania

You need at least PHP 5.0.0 and pxlib >= 0.4.4 for the basic set of functions. Some newer functions are only available with pxlib >= 0.6.0. Reading and writing of encrypted databases requires at least pxlib >= 0.5.0. The paradox library (pxlib) is available at http://pxlib.sourceforge.net.

# Instalacja

A short installation note: just type

    $ pear install paradox

in your console. Make sure you have pxlib installed before. If you install pxlib from an rpm or debian package, do not forget to install the development package as well.

# Konfiguracja czasu wykonywania

To rozszerzenie nie definiuje posiada żadnych dyrektyw konfiguracyjnych w pliku `php.ini`.

# Object oriented API

The paradox extension provides also an object oriented API. It consists of only one class called paradox_db. Its methods only differ from the functions in its name and of course the missing first parameter. The following table will list all methods and its equivalent functions.

Tabela 1. Methods of class paradox_db

Name of method | Equivalent function
--- | ---
Constructor | px_new()
Destructor | px_delete()
open_fp() | px_open_fp()
create_fp() | px_create_fp()
close() | px_close()
numrecords() | px_numrecords()
numfields() | px_numfields()
get_record() | px_get_record()
put_record() | px_put_record()
retrieve_record() | px_retrieve_record()
delete_record() | px_delete_record()
insert_record() | px_insert_record()
update_record() | px_update_record()
get_field() | px_get_field()
get_schema() | px_get_schema()
get_info() | px_get_info()
set_parameter() | px_set_parameter()
get_parameter() | px_get_parameter()
set_value() | px_set_value()
get_value() | px_get_value()
get_info() | px_get_info()
set_targetencoding() | px_set_targetencoding()
set_tablename() | px_set_tablename()
set_blob_file() | px_set_blob_file()
date2string() | px_date2string()
timestamp2string() | px_timestamp2string()

# Stałe predefinopwane

Poniższe stałe są zdefiniowane w tym rozszerzeniu i stają się dostępne, gdy rozszerzenie jest dokompilowane do PHP, lub załadowane dynamicznie przy starcie.

The following two tables lists all constants defined by the paradox extension.

Tabela 2. Contants for field types

Name | Meaning
--- | ---
PX_FIELD_ALPHA | Character data with fixed length
PX_FIELD_DATE | Date, number of days since 1.1.0000
PX_FIELD_SHORT | Short integer (2 Bytes)
PX_FIELD_LONG | Long integer (4 Bytes)
PX_FIELD_CURRENCY | same as PX_FIELD_NUMBER
PX_FIELD_NUMBER | Double
PX_FIELD_LOGICAL | Boolean
PX_FIELD_MEMOBLOB | Binary large object
PX_FIELD_BLOB | Binary large object (not supported)
PX_FIELD_FMTMEMOBLOB | Binary large object
PX_FIELD_OLE | OLE object (basically a blob, not supported)
PX_FIELD_GRAPHIC | Graphic (basically a blob, not supported)
PX_FIELD_TIME | time, number of milli seconds since midnight
PX_FIELD_TIMESTAMP | timestamp, number of milli seconds since 1.1.0000
PX_FIELD_AUTOINC | Auto incrementing interger (like PX_FIELD_LONG)
PX_FIELD_BCD | Decimal number stored in bcd format (not supported)
PX_FIELD_BYTES | Array of Bytes with not more than 255 bytes (not supported)
PX_KEYTOLOWER | Turn all field names into lower case
PX_KEYTOUPPER | Turn all field names into upper case

Tabela 3. Contants for file types

Name | Meaning
--- | ---
PX_FILE_INDEX_DB | Indexed database
PX_FILE_PRIM_INDEX | Primary index
PX_FILE_NON_INDEX_DB | None indexed database
PX_FILE_NON_INC_SEC_INDEX | None incremental secondary index
PX_FILE_SEC_INDEX | Secondary index
PX_FILE_INC_SEC_INDEX | Incremental secondary index
PX_FILE_NON_INC_SEC_INDEX_G | Non incremental secondary index
PX_FILE_SEC_INDEX_G | Secondary index
PX_FILE_INC_SEC_INDEX_G | Non incremental secondary index

Poprzedni | Spis treści | Następny
ovrimos_rollback | Początek rozdziału | px_close