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# LXIX. Unified ODBC functions

# Introduction

In addition to normal ODBC support, the Unified ODBC functions in PHP allow you to access several databases that have borrowed the semantics of the ODBC API to implement their own API. Instead of maintaining multiple database drivers that were all nearly identical, these drivers have been unified into a single set of ODBC functions.

The following databases are supported by the Unified ODBC functions: Adabas D, IBM DB2, iODBC, Solid, and Sybase SQL Anywhere.

> Note: There is no ODBC involved when connecting to the above databases. The functions that you use to speak natively to them just happen to share the same names and syntax as the ODBC functions. The exception to this is iODBC. Building PHP with iODBC support enables you to use any ODBC-compliant drivers with your PHP applications. iODBC is maintained by OpenLink Software. More information on iODBC, as well as a HOWTO, is available at www.iodbc.org.

# Requirements

To access any of the supported databases you need to have the required libraries installed.

# Installation

Please see the Database installation options chapter for more information about configuring PHP with these databases.

# Runtime Configuration

The behaviour of these functions is affected by settings in `php.ini`.

Table 1. Unified ODBC Configuration Options

Name | Default | Changeable
--- | --- | ---
odbc.default_db * | NULL | PHP_INI_ALL
odbc.default_user * | NULL | PHP_INI_ALL
odbc.default_pw * | NULL | PHP_INI_ALL
odbc.allow_persistent | "1" | PHP_INI_SYSTEM
odbc.check_persistent | "1" | PHP_INI_SYSTEM
odbc.max_persistent | "-1" | PHP_INI_SYSTEM
odbc.max_links | "-1" | PHP_INI_SYSTEM
odbc.defaultlrl | "4096" | PHP_INI_ALL
odbc.defaultbinmode | "1" | PHP_INI_ALL

> Note: Entries marked with * are not implemented yet.

For further details and definition of the PHP_INI_* constants see ini_set().

Here is a short explanation of the configuration directives.

`odbc.default_db` string

  ODBC data source to use if none is specified in odbc_connect() or odbc_pconnect().

`odbc.default_user` string

  User name to use if none is specified in odbc_connect() or odbc_pconnect().

`odbc.default_pw` string

  Password to use if none is specified in odbc_connect() or odbc_pconnect().

`odbc.allow_persistent` boolean

  Whether to allow persistent ODBC connections.

`odbc.check_persistent` boolean

  Check that a connection is still valid before reuse.

`odbc.max_persistent` integer

  The maximum number of persistent ODBC connections per process.

`odbc.max_links` integer

  The maximum number of ODBC connections per process, including persistent connections.

`odbc.defaultlrl` integer

  Handling of LONG fields. Specifies the number of bytes returned to variables.

`odbc.defaultbinmode` integer

  Handling of binary data.

# Resource Types

This extension has no resource types defined.

# Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

`ODBC_TYPE` (integer)

`ODBC_BINMODE_PASSTHRU` (integer)

`ODBC_BINMODE_RETURN` (integer)

`ODBC_BINMODE_CONVERT` (integer)

`SQL_ODBC_CURSORS` (integer)

`SQL_CUR_USE_DRIVER` (integer)

`SQL_CUR_USE_IF_NEEDED` (integer)

`SQL_CUR_USE_ODBC` (integer)

`SQL_CONCURRENCY` (integer)

`SQL_CONCUR_READ_ONLY` (integer)

`SQL_CONCUR_LOCK` (integer)

`SQL_CONCUR_ROWVER` (integer)

`SQL_CONCUR_VALUES` (integer)

`SQL_CURSOR_TYPE` (integer)

`SQL_CURSOR_FORWARD_ONLY` (integer)

`SQL_CURSOR_KEYSET_DRIVEN` (integer)

`SQL_CURSOR_DYNAMIC` (integer)

`SQL_CURSOR_STATIC` (integer)

`SQL_KEYSET_SIZE` (integer)

`SQL_CHAR` (integer)

`SQL_VARCHAR` (integer)

`SQL_LONGVARCHAR` (integer)

`SQL_DECIMAL` (integer)

`SQL_NUMERIC` (integer)

`SQL_BIT` (integer)

`SQL_TINYINT` (integer)

`SQL_SMALLINT` (integer)

`SQL_INTEGER` (integer)

`SQL_BIGINT` (integer)

`SQL_REAL` (integer)

`SQL_FLOAT` (integer)

`SQL_DOUBLE` (integer)

`SQL_BINARY` (integer)

`SQL_VARBINARY` (integer)

`SQL_LONGVARBINARY` (integer)

`SQL_DATE` (integer)

`SQL_TIME` (integer)

`SQL_TIMESTAMP` (integer)

`SQL_TYPE_DATE` (integer)

`SQL_TYPE_TIME` (integer)

`SQL_TYPE_TIMESTAMP` (integer)

`SQL_BEST_ROWID` (integer)

`SQL_ROWVER` (integer)

`SQL_SCOPE_CURROW` (integer)

`SQL_SCOPE_TRANSACTION` (integer)

`SQL_SCOPE_SESSION` (integer)

`SQL_NO_NULLS` (integer)

`SQL_NULLABLE` (integer)

`SQL_INDEX_UNIQUE` (integer)

`SQL_INDEX_ALL` (integer)

`SQL_ENSURE` (integer)

`SQL_QUICK` (integer)

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