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https://github.com/sigmasternchen/php-doc-en
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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@330593 c90b9560-bf6c-de11-be94-00142212c4b1
271 lines
8 KiB
XML
271 lines
8 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<refentry xml:id="function.cubrid-get-db-parameter" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
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<refnamediv>
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<refname>cubrid_get_db_parameter</refname>
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<refpurpose>Returns the CUBRID database parameters</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>array</type><methodname>cubrid_get_db_parameter</methodname>
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<methodparam><type>resource</type><parameter>conn_identifier</parameter></methodparam>
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</methodsynopsis>
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<para>
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This function returns the CUBRID database parameters or it returns FALSE on
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failure. It returns an associative array with the values for the following
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parameters:
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</para>
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<para>
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<simplelist>
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<member><constant>PARAM_ISOLATION_LEVEL</constant></member>
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<member><constant>PARAM_LOCK_TIMEOUT</constant></member>
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<member><constant>PARAM_MAX_STRING_LENGTH</constant></member>
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<member><constant>PARAM_AUTO_COMMIT</constant></member>
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</simplelist>
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</para>
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<para>
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<table>
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<title>Database parameters</title>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>Parameter</entry>
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<entry>Description</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>PARAM_ISOLATION_LEVEL</entry>
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<entry>The transaction isolation level.</entry>
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</row>
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<row>
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<entry>LOCK_TIMEOUT</entry>
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<entry>CUBRID provides the lock timeout feature, which sets the waiting
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time (in seconds) for the lock until the transaction lock setting is
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allowed. The default value of the lock_timeout_in_secs parameter is
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-1, which means the application client will wait indefinitely until
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the transaction lock is allowed.
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</entry>
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</row>
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<row>
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<entry>PARAM_AUTO_COMMIT</entry>
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<entry>In CUBRID PHP, auto-commit mode is disabled by default for
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transaction management. It can be set by using
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<function>cubrid_set_autocommit</function>.
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</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</para>
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<para>
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The following table shows the isolation levels from 1 to 6. It consists of
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table schema (row) and isolation level:
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<table>
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<title>Levels of Isolation Supported by CUBRID</title>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>Name</entry>
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<entry>Description</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>SERIALIZABLE (6)</entry>
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<entry>In this isolation level, problems concerning concurrency (e.g.
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dirty read, non-repeatable read, phantom read, etc.) do not
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occur.</entry>
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</row>
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<row>
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<entry>REPEATABLE READ CLASS with REPEATABLE READ INSTANCES (5)</entry>
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<entry>Another transaction T2 cannot update the schema of table A while
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transaction T1 is viewing table A.
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Transaction T1 may experience phantom read for the record R that was
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inserted by another transaction T2 when it is repeatedly retrieving a
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specific record.</entry>
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</row>
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<row>
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<entry>REPEATABLE READ CLASS with READ COMMITTED INSTANCES (or CURSOR STABILITY) (4)</entry>
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<entry>Another transaction T2 cannot update the schema of table A while
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transaction T1 is viewing table A.
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Transaction T1 may experience R read (non-repeatable read) that was
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updated and committed by another transaction T2 when it is repeatedly
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retrieving the record R.</entry>
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</row>
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<row>
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<entry>REPEATABLE READ CLASS with READ UNCOMMITTED INSTANCES (3)</entry>
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<entry>Default isolation level. Another transaction T2 cannot update
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the schema of table A while transaction T1 is viewing table A.
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Transaction T1 may experience R' read (dirty read) for the record that
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was updated but not committed by another transaction T2.</entry>
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</row>
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<row>
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<entry>READ COMMITTED CLASS with READ COMMITTED INSTANCES (2)</entry>
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<entry>Transaction T1 may experience A' read (non-repeatable read) for
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the table that was updated and committed by another transaction T2
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while it is viewing table A repeatedly. Transaction T1 may experience
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R' read (non-repeatable read) for the record that was updated and
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committed by another transaction T2 while it is retrieving the record
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R repeatedly.</entry>
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</row>
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<row>
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<entry>READ COMMITTED CLASS with READ UNCOMMITTED INSTANCES (1)</entry>
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<entry>Transaction T1 may experience A' read (non-repeatable read) for
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the table that was updated and committed by another transaction T2
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while it is repeatedly viewing table A. Transaction T1 may experience
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R' read (dirty read) for the record that was updated but not committed
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by another transaction T2.</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>conn_identifier</parameter></term>
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<listitem><para>
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The CUBRID connection. If the connection identifier is not specified,
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the last link opened by <function>cubrid_connect</function> is assumed.
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</para></listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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An associative array with CUBRID database parameters; on success.
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</para>
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<para>
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&false; on failure.
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</para>
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</refsect1>
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<refsect1 role="changelog">
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&reftitle.changelog;
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<para>
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<informaltable>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>&Version;</entry>
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<entry>&Description;</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>8.4.0</entry>
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<entry>
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Change LOCK_TIMEOUT to PARAM_LOCK_TIMEOUT, and MAX_STRING_LENGTH to
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PARAM_MAX_STRING_LENGTH in result.
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</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</para>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<example>
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<title><function>cubrid_get_db_parameter</function> example</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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printf("%-30s %s\n", "CUBRID PHP Version:", cubrid_version());
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printf("\n");
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$conn = cubrid_connect("localhost", 33088, "demodb");
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if (!$conn) {
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die('Connect Error ('. cubrid_error_code() .')' . cubrid_error_msg());
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}
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$db_params = cubrid_get_db_parameter($conn);
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while (list($param_name, $param_value) = each($db_params)) {
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printf("%-30s %s\n", $param_name, $param_value);
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}
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printf("\n");
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$server_info = cubrid_get_server_info($conn);
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$client_info = cubrid_get_client_info();
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printf("%-30s %s\n", "Server Info:", $server_info);
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printf("%-30s %s\n", "Client Info:", $client_info);
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printf("\n");
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$charset = cubrid_get_charset($conn);
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printf("%-30s %s\n", "CUBRID Charset:", $charset);
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cubrid_disconnect($conn);
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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CUBRID PHP Version: 9.1.0.0001
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PARAM_ISOLATION_LEVEL 3
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LOCK_TIMEOUT -1
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MAX_STRING_LENGTH 1073741823
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PARAM_AUTO_COMMIT 1
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Server Info: 9.1.0.0212
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Client Info: 9.1.0
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CUBRID Charset: iso8859-1
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]]>
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</screen>
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</example>
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><function>cubrid_set_db_parameter</function></member>
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<member><function>cubrid_get_autocommit</function></member>
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</simplelist>
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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