Настройка во время выполнения
Поведение этих функций зависит от установок в php.ini.
| Имя | По умолчанию | Меняемо | Changelog |
|---|---|---|---|
| ibm_db2.binmode | "1" | PHP_INI_ALL | |
| ibm_db2.i5_allow_commit | "0" | PHP_INI_SYSTEM | Available since ibm_db2 1.4.9. |
| ibm_db2.i5_dbcs_alloc | "0" | PHP_INI_SYSTEM | Available since ibm_db2 1.5.0. |
| ibm_db2.instance_name | NULL | PHP_INI_SYSTEM | Available since ibm_db2 1.0.2. |
| ibm_db2.i5_all_pconnect | "0" | PHP_INI_SYSTEM | Available since ibm_db2 1.6.5. |
Краткое разъяснение конфигурационных директив.
- ibm_db2.binmode integer
-
This option controls the mode used for converting to and from binary data in the PHP application.
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1 (DB2_BINARY)
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2 (DB2_CONVERT)
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3 (DB2_PASSTHRU)
-
- ibm_db2.i5_allow_commit integer
-
This option controls the commit mode used for i5 schema collections in the PHP application.
-
0 no commit (see i5_commit for override)
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1 allow commit (see i5_commit for override)
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- ibm_db2.i5_dbcs_alloc integer
-
This option controls the internal ibm_db2 allocation scheme for large DBCS column buffers.
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0 no expanded allocations (see i5_dbcs_alloc for override)
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1 use expanded allocations (see i5_dbcs_alloc for override)
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- ibm_db2.instance_name string
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On Linux and UNIX operating systems, this option defines the name of the instance to use for cataloged database connections. If this option is set, its value overrides the DB2INSTANCE environment variable setting.
This option is ignored on Windows operating systems.
- ibm_db2.i5_all_pconnect integer
-
This option overrides i5 db2_connect full open and close in the PHP application. When ibm_db2.i5_all_pconnect = 1, all db2 connections become persistent (db2_pconnect). On i5/OS, db2_pconnect performs dramatically better with lower machine stress over db2_connect. This is a convenience override of db2_connect to evoke db2_pconnect without PHP source code changes.
-
0 db2_connect default full open and close
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1 db2_connect override to db2_pconnect for persistent connection only
-
Коментарии
The explanation of ibm_db2.i5_dbcs_alloc seems to be hard to understand for me.
In ibm_db2 extension inside, 6 times length of string column is allocated if i5_dbcs_alloc value is 1.
The allocated area is used for conversion between UTF-8 and EBCDIC character encodings.
By the definition of UTF-8, letter length can need 6 bytes at the maximum.
Note:
In the case of a long column, allocated size may be beyond the upper limit defined in DB2 because original column is made by 6 times. It can cause result data becomes null.
The explanation of ibm_db2.i5_allow_commit seems to be slightly difficult to understand for me.
I think it would be better to replace "no commit" with "can not use commitment control" or "do not allow transaction", and "allow commit" would be changed into
"can use commitment control" or "allow transaction" , Thanks.