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Поведение этих функций зависит от установок в php.ini.

Ingres configuration options

Name	Default	Changeable	Changelog
ingres.allow_persistent	"1"	PHP_INI_SYSTEM	Available since ingres 1.0.0
ingres.array_index_start	"1"	PHP_INI_ALL	Available since ingres 1.4.0.
ingres.auto	"1"	PHP_INI_ALL	Available since ingres 2.0.0.
ingres.blob_segment_length	"4096"	PHP_INI_ALL	Available since ingres 1.2.0.
ingres.cursor_mode	"0"	PHP_INI_ALL	Available since ingres 1.1.0.
ingres.default_database	NULL	PHP_INI_ALL	Available since ingres 1.0.0
ingres.default_password	NULL	PHP_INI_ALL	Available since ingres 1.0.0
ingres.default_user	NULL	PHP_INI_ALL	Available since ingres 1.0.0
ingres.describe	1	PHP_INI_ALL	Available since ingres 2.1.0
ingres.fetch_buffer_size	100	PHP_INI_ALL	Available since ingres 2.1.0
ingres.max_links	"-1"	PHP_INI_SYSTEM	Available since ingres 1.0.0
ingres.max_persistent	"-1"	PHP_INI_SYSTEM	Available since ingres 1.0.0
ingres.reuse_connection	"1"	PHP_INI_ALL	Available since ingres 2.0.0
ingres.scrollable	"1"	PHP_INI_ALL	Available since ingres 2.0.0.
ingres.trace	"0"	PHP_INI_ALL	Available since ingres 2.0.0.
ingres.trace_connect	"0"	PHP_INI_ALL	Available since ingres 1.2.1.
ingres.utf8	"1"	PHP_INI_ALL	Available since ingres 2.0.0.

Для подробного описания констант PHP_INI_*, обратитесь к документации функции ini_set().

Краткое разъяснение конфигурационных директив.

ingres.allow_persistent boolean

Specifies whether to allow persistent connections to Ingres

ingres.array_index_start integer

Specifies, by default, the array returned by ingres_fetch_array() and ingres_fetch_row() indexes from 1. To make the Ingres extension compatible with other database extensions, set this to 0.

ingres.auto boolean

Enables or disables autocommit emulation. Ingres cannot have multiple cursors open with autocommit enabled. When enabled, the driver emulates autocommit.

ingres.blob_segment_length integer

Specifies the amount of memory to use when reading BLOB data, in bytes

ingres.cursor_mode integer

Specifies the default mode for cursors opened with ingres_prepare(). Valid values are INGRES_CURSOR_UPDATE or INGRES_CURSOR_READONLY.

ingres.default_database string

Specifies the default database name to use when connecting to the database server if no other name is specified. Does not apply in SQL safe mode.

ingres.default_password string

Specifies the default password to use when connecting to the database server if no other name is specified. Does not apply in SQL safe mode.

ingres.default_user string

Specifies the default user name to use when connecting to the database server if no other name is specified. Does not apply in SQL safe mode.

ingres.describe boolean

Enables the use of DESCRIBE INPUT to determine the expected data types for queries that use parameters. Available with Ingres 9.1.0 and later. When disabled, queries that have parameters passed may need to manually describe the types of those parameters using the types parameter in ingres_query().

Замечание: Enabling this feature with ingres_query() will cause additional communications traffic between this extension and the server. To minimize this additional traffic, use ingres_prepare() and ingres_execute().

ingres.fetch_buffer_size integer

Specifies the number of pre-fetch rows that ingres_fetch_array(), ingres_fetch_object() and ingres_fetch_row() will try and fetch in one fetch operation.

ingres.max_links integer

Specifies the maximum number of Ingres sessions allowed per process or thread. The number of sessions should not exceed the total number of connected sessions configured within Ingres.

ingres.max_persistent integer

Specifies the maximum number of persistent Ingres sessions allowed per process or thread. The number of sessions should not exceed the total number of connected sessions configured within Ingres.

ingres.reuse_connection boolean

Reuses an existing active connection if connecting to the same database with the same user name

ingres.scrollable boolean

Enables support for scrollable cursors. When fetching CLOB or BLOB data, this should be set to FALSE. Available with Ingres 9.2.0 or later.

ingres.trace boolean

Enables simple tracing using E_NOTICE messages

ingres.trace_connect boolean

Prints E_NOTICE messages during ingres_connect or ingres_pconnect calls

ingres.utf8 boolean

Assumes that strings being passed to National Character column types (NVARCHAR or NCHAR) are using UTF8 encoding and converts them to UTF16 for the server