Beschreibung

cubrid_get_db_parameter(resource $conn_identifier): array

This function returns the CUBRID database parameters,Bei einem Fehler wird false zurückgegeben.. It returns an associative array with the values for the following parameters:

PARAM_ISOLATION_LEVEL
PARAM_LOCK_TIMEOUT
PARAM_MAX_STRING_LENGTH
PARAM_AUTO_COMMIT

**Database parameters**
Parameter	Description
PARAM_ISOLATION_LEVEL	The transaction isolation level.
LOCK_TIMEOUT	CUBRID provides the lock timeout feature, which sets the waiting time (in seconds) for the lock until the transaction lock setting is allowed. The default value of the lock_timeout_in_secs parameter is -1, which means the application client will wait indefinitely until the transaction lock is allowed.
PARAM_AUTO_COMMIT	In CUBRID PHP, auto-commit mode is disabled by default for transaction management. It can be set by using cubrid_set_autocommit().

The following table shows the isolation levels from 1 to 6. It consists of table schema (row) and isolation level:
Levels of Isolation Supported by CUBRID

Name Description

SERIALIZABLE (6) In this isolation level, problems concerning concurrency (e.g. dirty read, non-repeatable read, phantom read, etc.) do not occur.

REPEATABLE READ CLASS with REPEATABLE READ INSTANCES (5) Another transaction T2 cannot update the schema of table A while transaction T1 is viewing table A. Transaction T1 may experience phantom read for the record R that was inserted by another transaction T2 when it is repeatedly retrieving a specific record.

REPEATABLE READ CLASS with READ COMMITTED INSTANCES (or CURSOR STABILITY) (4) Another transaction T2 cannot update the schema of table A while transaction T1 is viewing table A. Transaction T1 may experience R read (non-repeatable read) that was updated and committed by another transaction T2 when it is repeatedly retrieving the record R.

REPEATABLE READ CLASS with READ UNCOMMITTED INSTANCES (3) Default isolation level. Another transaction T2 cannot update the schema of table A while transaction T1 is viewing table A. Transaction T1 may experience R' read (dirty read) for the record that was updated but not committed by another transaction T2.

READ COMMITTED CLASS with READ COMMITTED INSTANCES (2) Transaction T1 may experience A' read (non-repeatable read) for the table that was updated and committed by another transaction T2 while it is viewing table A repeatedly. Transaction T1 may experience R' read (non-repeatable read) for the record that was updated and committed by another transaction T2 while it is retrieving the record R repeatedly.

READ COMMITTED CLASS with READ UNCOMMITTED INSTANCES (1) Transaction T1 may experience A' read (non-repeatable read) for the table that was updated and committed by another transaction T2 while it is repeatedly viewing table A. Transaction T1 may experience R' read (dirty read) for the record that was updated but not committed by another transaction T2.

**Levels of Isolation Supported by CUBRID**
Name	Description
SERIALIZABLE (6)	In this isolation level, problems concerning concurrency (e.g. dirty read, non-repeatable read, phantom read, etc.) do not occur.
REPEATABLE READ CLASS with REPEATABLE READ INSTANCES (5)	Another transaction T2 cannot update the schema of table A while transaction T1 is viewing table A. Transaction T1 may experience phantom read for the record R that was inserted by another transaction T2 when it is repeatedly retrieving a specific record.
REPEATABLE READ CLASS with READ COMMITTED INSTANCES (or CURSOR STABILITY) (4)	Another transaction T2 cannot update the schema of table A while transaction T1 is viewing table A. Transaction T1 may experience R read (non-repeatable read) that was updated and committed by another transaction T2 when it is repeatedly retrieving the record R.
REPEATABLE READ CLASS with READ UNCOMMITTED INSTANCES (3)	Default isolation level. Another transaction T2 cannot update the schema of table A while transaction T1 is viewing table A. Transaction T1 may experience R' read (dirty read) for the record that was updated but not committed by another transaction T2.
READ COMMITTED CLASS with READ COMMITTED INSTANCES (2)	Transaction T1 may experience A' read (non-repeatable read) for the table that was updated and committed by another transaction T2 while it is viewing table A repeatedly. Transaction T1 may experience R' read (non-repeatable read) for the record that was updated and committed by another transaction T2 while it is retrieving the record R repeatedly.
READ COMMITTED CLASS with READ UNCOMMITTED INSTANCES (1)	Transaction T1 may experience A' read (non-repeatable read) for the table that was updated and committed by another transaction T2 while it is repeatedly viewing table A. Transaction T1 may experience R' read (dirty read) for the record that was updated but not committed by another transaction T2.

Parameter-Liste

conn_identifier: The CUBRID connection. If the connection identifier is not specified, the last link opened by cubrid_connect() is assumed.

Rückgabewerte

An associative array with CUBRID database parameters; on success,Bei einem Fehler wird false zurückgegeben..

Changelog

Version	Beschreibung
8.4.0	Change LOCK_TIMEOUT to PARAM_LOCK_TIMEOUT, and MAX_STRING_LENGTH to PARAM_MAX_STRING_LENGTH in result.

Beispiele

Beispiel #1 cubrid_get_db_parameter() example

<?php
printf("%-30s %s\n", "CUBRID PHP Version:", cubrid_version());

printf("\n");

$conn = cubrid_connect("localhost", 33088, "demodb");

if (!$conn) {
    die('Connect Error ('. cubrid_error_code() .')' . cubrid_error_msg());
}

$db_params = cubrid_get_db_parameter($conn);

while (list($param_name, $param_value) = each($db_params)) {
    printf("%-30s %s\n", $param_name, $param_value);
}

printf("\n");

$server_info = cubrid_get_server_info($conn);
$client_info = cubrid_get_client_info();

printf("%-30s %s\n", "Server Info:", $server_info);
printf("%-30s %s\n", "Client Info:", $client_info);

printf("\n");

$charset = cubrid_get_charset($conn);

printf("%-30s %s\n", "CUBRID Charset:", $charset);

cubrid_disconnect($conn);

?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

CUBRID PHP Version:            9.1.0.0001

PARAM_ISOLATION_LEVEL          3
LOCK_TIMEOUT                   -1
MAX_STRING_LENGTH              1073741823
PARAM_AUTO_COMMIT              1

Server Info:                   9.1.0.0212
Client Info:                   9.1.0

CUBRID Charset:                iso8859-1

Siehe auch

cubrid_set_db_parameter() - Sets the CUBRID database parameters
cubrid_get_autocommit() - Get auto-commit mode of the connection