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# CIII. Paradox File Access

# 简介

警告
本扩展模块是实验性的。本模块的行为，包括其函数的名称以及其它任何关于此模块的文档可能会在没有通知的情况下随 PHP 以后的发布而改变。使用本扩展模块风险自担。

This module allows to read Paradox database and primary index files. It has initial support for creating Paradox databases. Consider it to be experimental due to lack of documentation of the Paradox file format.

> 注: This module has not been tested on other platforms than Debian/GNU Linux for PPC.

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

# 需求

You need at least PHP 5.0.0 and libpx >= 0.1.9. The paradox library (libpx) is available at http://pxlib.sourceforge.net.

# 安装

A short installation note: just type

    $ pear install paradox

in your console.

# 运行时配置

本扩展模块在 `php.ini` 中未定义任何配置选项。

# Object oriented API

The paradox extension provides also an object oriented API. It consists of only one class called paradox_doc. 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.

表格 1. Methods of class paradox_doc

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()
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()
timestamp2string() | px_timestamp2string()

# 预定义常量

以下常量由本扩展模块定义，因此只有在本扩展模块被编译到 PHP 中，或者在运行时被动态加载后才有效。

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

表格 2. Contants for field types

Name | Meaning
--- | ---
PX_FIELD_ALPHA | Character data with fixed length
PX_FIELD_DATE | Date
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 (not supported)
PX_FIELD_BLOB | Binary large object (not supported)
PX_FIELD_FMTMEMOBLOB | Binary large object (not supported)
PX_FIELD_OLE | OLE object (basically a blob, not supported)
PX_FIELD_GRAPHIC | Graphic (basically a blob, not supported)
PX_FIELD_TIME | time
PX_FIELD_TIMESTAMP | timestamp (like the unix timestamp)
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 |
PX_KEYTOUPPER |

表格 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 (not supported)
PX_FILE_SEC_INDEX | Secondary index (not supported)
PX_FILE_INC_SEC_INDEX | Incremental secondary index (not supported)
PX_FILE_NON_INC_SEC_INDEX_G | (not supported)
PX_FILE_SEC_INDEX_G | (not supported)
PX_FILE_INC_SEC_INDEX_G | (not supported)

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