**Ingres configuration options**
Имя	По умолчанию	Меняемо	Список изменений
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 разделу Где могут быть установлены параметры конфигурации.

Краткое разъяснение конфигурационных директив.

ingres.allow_persistent boolean: Specifies whether to allow persistent connections to Ingres
ingres.array_index_start integer: Specifies the start value for an integer key for arrays generated by ingres_fetch_row() or ingres_fetch_array(). By default ingres.array_index_start is set to 1. If you wish to make the ingres extension behave like other database extensions set this configuration option 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

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