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e41806c30b
Document false and null return types Cf. <https://news-web.php.net/php.doc.cvs/17645>. git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@351730 c90b9560-bf6c-de11-be94-00142212c4b1
703 lines
23 KiB
XML
703 lines
23 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- Generated by xml_proto.php v2.2. Found in /scripts directory of phpdoc. -->
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<refentry xml:id="function.db2-connect" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>db2_connect</refname>
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<refpurpose>
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Returns a connection to a database
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</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>resource</type><methodname>db2_connect</methodname>
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<methodparam><type>string</type><parameter>database</parameter></methodparam>
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<methodparam><type>string</type><parameter>username</parameter></methodparam>
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<methodparam><type>string</type><parameter>password</parameter></methodparam>
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<methodparam choice="opt"><type>array</type><parameter>options</parameter></methodparam>
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</methodsynopsis>
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<para>
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Creates a new connection to an IBM DB2 Universal Database, IBM Cloudscape,
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or Apache Derby database.
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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>database</parameter></term>
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<listitem>
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<para>
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For a cataloged connection to a database, <parameter>database</parameter>
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represents the database alias in the DB2 client catalog.
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</para>
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<para>
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For an uncataloged connection to a database,
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<parameter>database</parameter> represents a complete connection
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string in the following format:
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<literallayout>DATABASE=<parameter>database</parameter>;HOSTNAME=<parameter>hostname</parameter>;PORT=<parameter>port</parameter>;PROTOCOL=TCPIP;UID=<parameter>username</parameter>;PWD=<parameter>password</parameter>;</literallayout>
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where the parameters represent the following values:
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<variablelist>
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<varlistentry>
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<term><parameter>database</parameter></term>
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<listitem>
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<para>
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The name of the database.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>hostname</parameter></term>
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<listitem>
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<para>
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The hostname or IP address of the database server.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>port</parameter></term>
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<listitem>
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<para>
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The TCP/IP port on which the database is listening for
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requests.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>username</parameter></term>
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<listitem>
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<para>
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The username with which you are connecting to the
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database.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>password</parameter></term>
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<listitem>
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<para>
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The password with which you are connecting to the database.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>username</parameter></term>
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<listitem>
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<para>
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The username with which you are connecting to the database.
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</para>
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<para>
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For uncataloged connections, you must pass a &null; value or empty
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string.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>password</parameter></term>
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<listitem>
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<para>
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The password with which you are connecting to the database.
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</para>
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<para>
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For uncataloged connections, you must pass a &null; value or empty
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string.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>options</parameter></term>
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<listitem>
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<para>
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An associative array of connection options that affect the behavior
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of the connection, where valid array keys include:
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<variablelist>
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<varlistentry>
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<term><parameter>autocommit</parameter></term>
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<listitem>
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<para>
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Passing the <literal>DB2_AUTOCOMMIT_ON</literal> value turns
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autocommit on for this connection handle.
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</para>
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<para>
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Passing the <literal>DB2_AUTOCOMMIT_OFF</literal> value turns
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autocommit off for this connection handle.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>DB2_ATTR_CASE</parameter></term>
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<listitem>
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<para>
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Passing the <literal>DB2_CASE_NATURAL</literal> value specifies
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that column names are returned in natural case.
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</para>
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<para>
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Passing the <literal>DB2_CASE_LOWER</literal> value specifies
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that column names are returned in lower case.
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</para>
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<para>
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Passing the <literal>DB2_CASE_UPPER</literal> value specifies
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that column names are returned in upper case.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>CURSOR</parameter></term>
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<listitem>
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<para>
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Passing the <literal>DB2_FORWARD_ONLY</literal> value specifies a
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forward-only cursor for a statement resource. This is the default
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cursor type and is supported on all database servers.
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</para>
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<para>
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Passing the <literal>DB2_SCROLLABLE</literal> value specifies a
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scrollable cursor for a statement resource. This mode enables
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random access to rows in a result set, but currently is supported
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only by IBM DB2 Universal Database.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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<para>
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The following new option is available in ibm_db2 version 1.7.0 and later.
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<variablelist>
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<varlistentry>
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<term><parameter>trustedcontext</parameter></term>
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<listitem>
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<para>
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Passing the DB2_TRUSTED_CONTEXT_ENABLE value turns trusted context
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on for this connection handle. This parameter cannot be set using
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<function>db2_set_option</function>.
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</para>
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<para>
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This key works only if the database is cataloged (even if the
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database is local), or if you specify the full DSN when you create
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the connection.
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</para>
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<para>
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To catalog the database, use following commands:
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</para>
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<para>
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<literallayout>db2 catalog tcpip node loopback remote <SERVERNAME> server <SERVICENAME>
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db2 catalog database <LOCALDBNAME> as <REMOTEDBNAME> at node loopback
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db2 "update dbm cfg using svcename <SERVICENAME>"
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db2set DB2COMM=TCPIP</literallayout>
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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<para>
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The following new i5/OS options are available in ibm_db2 version 1.5.1
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and later.
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<variablelist>
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<varlistentry>
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<term><parameter>i5_lib</parameter></term>
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<listitem>
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<para>
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A character value that indicates the default library that will be
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used for resolving unqualified file references. This is not valid
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if the connection is using system naming mode.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>i5_naming</parameter></term>
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<listitem>
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<para>
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<literal>DB2_I5_NAMING_ON</literal> value turns on DB2 UDB CLI iSeries
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system naming mode. Files are qualified using the slash (/) delimiter.
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Unqualified files are resolved using the library list for the job.
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</para>
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<para>
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<literal>DB2_I5_NAMING_OFF</literal> value turns off DB2 UDB CLI default
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naming mode, which is SQL naming. Files are qualified using the period (.)
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delimiter. Unqualified files are resolved using either the default library
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or the current user ID.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>i5_commit</parameter></term>
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<listitem>
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<para>
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The <parameter>i5_commit</parameter> attribute should be set before the
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<function>db2_connect</function>. If the value is changed after the
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connection has been established, and the connection is to a remote data
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source, the change does not take effect until the next successful
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<function>db2_connect</function> for the connection handle.
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<note>
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<para>
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The php.ini setting <parameter>ibm_db2.i5_allow_commit</parameter>==0
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or <literal>DB2_I5_TXN_NO_COMMIT</literal> is the default, but may be
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overridden with the <parameter>i5_commit</parameter> option.
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</para>
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</note>
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</para>
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<para>
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<literal>DB2_I5_TXN_NO_COMMIT</literal> - Commitment control is not used.
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</para>
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<para>
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<literal>DB2_I5_TXN_READ_UNCOMMITTED</literal> - Dirty reads, nonrepeatable
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reads, and phantoms are possible.
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</para>
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<para>
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<literal>DB2_I5_TXN_READ_COMMITTED</literal> - Dirty reads are not possible.
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Nonrepeatable reads, and phantoms are possible.
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</para>
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<para>
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<literal>DB2_I5_TXN_REPEATABLE_READ</literal> - Dirty reads and nonrepeatable
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reads are not possible. Phantoms are possible.
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</para>
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<para>
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<literal>DB2_I5_TXN_SERIALIZABLE</literal> - Transactions are serializable.
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Dirty reads, non-repeatable reads, and phantoms are not possible
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>i5_query_optimize</parameter></term>
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<listitem>
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<para>
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<literal>DB2_FIRST_IO</literal> All queries are optimized with the goal of
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returning the first page of output as fast as possible. This goal works well
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when the output is controlled by a user who is most likely to cancel the query
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after viewing the first page of output data. Queries coded with an
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OPTIMIZE FOR nnn ROWS clause honor the goal specified by the clause.
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</para>
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<para>
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<literal>DB2_ALL_IO</literal> All queries are optimized with the goal of running
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the entire query to completion in the shortest amount of elapsed time. This is a
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good option when the output of a query is being written to a file or report, or
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the interface is queuing the output data. Queries coded with an OPTIMIZE FOR nnn
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ROWS clause honor the goal specified by the clause. This is the default.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>i5_dbcs_alloc</parameter></term>
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<listitem>
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<para>
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<literal>DB2_I5_DBCS_ALLOC_ON</literal> value turns on DB2 6X allocation scheme
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for DBCS translation column size growth.
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</para>
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<para>
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<literal>DB2_I5_DBCS_ALLOC_OFF</literal> value turns off DB2 6X allocation scheme
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for DBCS translation column size growth.
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</para>
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<para>
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Note: php.ini setting <parameter>ibm_db2.i5_dbcs_alloc</parameter>==0 or
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<literal>DB2_I5_DBCS_ALLOC_OFF</literal> is the default, but may be overridden
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with the <parameter>i5_dbcs_alloc</parameter> option.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>i5_date_fmt</parameter></term>
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<listitem>
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<para>
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<literal>DB2_I5_FMT_ISO</literal> - The International Organization for Standardization
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(ISO) date format yyyy-mm-dd is used. This is the default.
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</para>
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<para>
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<literal>DB2_I5_FMT_USA</literal> - The United States date format mm/dd/yyyy is used.
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</para>
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<para>
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<literal>DB2_I5_FMT_EUR</literal> - The European date format dd.mm.yyyy is used.
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</para>
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<para>
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<literal>DB2_I5_FMT_JIS</literal> - The Japanese Industrial Standard date format
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yyyy-mm-dd is used.
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</para>
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<para>
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<literal>DB2_I5_FMT_MDY</literal> - The date format mm/dd/yyyy is used.
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</para>
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<para>
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<literal>DB2_I5_FMT_DMY</literal> - The date format dd/mm/yyyy is used.
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</para>
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<para>
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<literal>DB2_I5_FMT_YMD</literal> - The date format yy/mm/dd is used.
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</para>
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<para>
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<literal>DB2_I5_FMT_JUL</literal> - The Julian date format yy/ddd is used.
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</para>
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<para>
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<literal>DB2_I5_FMT_JOB</literal> - The job default is used.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>i5_date_sep</parameter></term>
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<listitem>
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<para>
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<literal>DB2_I5_SEP_SLASH</literal> - A slash ( / ) is used as the date separator.
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This is the default.
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</para>
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<para>
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<literal>DB2_I5_SEP_DASH</literal> - A dash ( - ) is used as the date separator.
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</para>
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<para>
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<literal>DB2_I5_SEP_PERIOD</literal> - A period ( . ) is used as the date
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separator.
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</para>
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<para>
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<literal>DB2_I5_SEP_COMMA</literal> - A comma ( , ) is used as the date separator.
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</para>
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<para>
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<literal>DB2_I5_SEP_BLANK</literal> - A blank is used as the date separator.
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</para>
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<para>
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<literal>DB2_I5_SEP_JOB</literal> - The job default is used
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>i5_time_fmt</parameter></term>
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<listitem>
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<para>
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<literal>DB2_I5_FMT_ISO</literal> - The International Organization for
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Standardization (ISO) time format hh.mm.ss is used. This is the default.
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</para>
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<para>
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<literal>DB2_I5_FMT_USA</literal> - The United States time format
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hh:mmxx is used, where xx is AM or PM.
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</para>
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<para>
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<literal>DB2_I5_FMT_EUR</literal> - The European time format hh.mm.ss
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is used.
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</para>
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<para>
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<literal>DB2_I5_FMT_JIS</literal> - The Japanese Industrial Standard
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time format hh:mm:ss is used.
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</para>
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<para>
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<literal>DB2_I5_FMT_HMS</literal> - The hh:mm:ss format is used.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>i5_time_sep</parameter></term>
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<listitem>
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<para>
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<literal>DB2_I5_SEP_COLON</literal> - A colon ( : ) is used as the time
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separator. This is the default.
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</para>
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<para>
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<literal>DB2_I5_SEP_PERIOD</literal> - A period ( . ) is used as the time
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separator.
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</para>
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<para>
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<literal>DB2_I5_SEP_COMMA</literal> - A comma ( , ) is used as the time
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separator.
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</para>
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<para>
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<literal>DB2_I5_SEP_BLANK</literal> - A blank is used as the time separator.
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</para>
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<para>
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<literal>DB2_I5_SEP_JOB</literal> - The job default is used.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>i5_decimal_sep</parameter></term>
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<listitem>
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<para>
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<literal>DB2_I5_SEP_PERIOD</literal> - A period ( . ) is used as
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the decimal separator. This is the default.
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</para>
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<para>
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<literal>DB2_I5_SEP_COMMA</literal> - A comma ( , ) is used as the
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decimal separator.
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</para>
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<para>
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<literal>DB2_I5_SEP_JOB</literal> - The job default is used.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
|
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<para>
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The following new i5/OS option is available in ibm_db2 version 1.8.0
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and later.
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<variablelist>
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<varlistentry>
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<term><parameter>i5_libl</parameter></term>
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<listitem>
|
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<para>
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A character value that indicates the library list that will be used for
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resolving unqualified file references. Specify the library list
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elements separated by blanks 'i5_libl'=>"MYLIB YOURLIB ANYLIB".
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</para>
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<note>
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<para>
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<parameter>i5_libl</parameter> calls qsys2/qcmdexc('cmd',cmdlen), which is only
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available in i5/OS V5R4 and later.
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</para>
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</note>
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</listitem>
|
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</varlistentry>
|
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</variablelist>
|
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</para>
|
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</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;
|
|
<para>
|
|
Returns a connection handle resource if the connection attempt is
|
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successful. If the connection attempt fails, <function>db2_connect</function>
|
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returns &false;.
|
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</para>
|
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</refsect1>
|
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|
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<refsect1 role="examples">
|
|
&reftitle.examples;
|
|
<para>
|
|
<example>
|
|
<title>Creating a cataloged connection</title>
|
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<para>
|
|
Cataloged connections require you to have previously cataloged the target
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database through the DB2 Command Line Processor (CLP) or DB2
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|
Configuration Assistant.
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</para>
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<programlisting role="php">
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<![CDATA[
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<?php
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$database = 'SAMPLE';
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$user = 'db2inst1';
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$password = 'ibmdb2';
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$conn = db2_connect($database, $user, $password);
|
|
|
|
if ($conn) {
|
|
echo "Connection succeeded.";
|
|
db2_close($conn);
|
|
}
|
|
else {
|
|
echo "Connection failed.";
|
|
}
|
|
?>
|
|
]]>
|
|
</programlisting>
|
|
&example.outputs;
|
|
<screen>
|
|
<![CDATA[
|
|
Connection succeeded.
|
|
]]>
|
|
</screen>
|
|
</example>
|
|
<example>
|
|
<title>Creating an uncataloged connection</title>
|
|
<para>
|
|
An uncataloged connection enables you to dynamically connect to a
|
|
database.
|
|
</para>
|
|
<programlisting role="php">
|
|
<![CDATA[
|
|
<?php
|
|
$database = 'SAMPLE';
|
|
$user = 'db2inst1';
|
|
$password = 'ibmdb2';
|
|
$hostname = 'localhost';
|
|
$port = 50000;
|
|
|
|
$conn_string = "DRIVER={IBM DB2 ODBC DRIVER};DATABASE=$database;" .
|
|
"HOSTNAME=$hostname;PORT=$port;PROTOCOL=TCPIP;UID=$user;PWD=$password;";
|
|
$conn = db2_connect($conn_string, '', '');
|
|
|
|
if ($conn) {
|
|
echo "Connection succeeded.";
|
|
db2_close($conn);
|
|
}
|
|
else {
|
|
echo "Connection failed.";
|
|
}
|
|
?>
|
|
]]>
|
|
</programlisting>
|
|
&example.outputs;
|
|
<screen>
|
|
<![CDATA[
|
|
Connection succeeded.
|
|
]]>
|
|
</screen>
|
|
</example>
|
|
<example>
|
|
<title>Creating a connection with autocommit off by default</title>
|
|
<para>
|
|
Passing an array of options to <function>db2_connect</function> enables
|
|
you to modify the default behavior of the connection handle.
|
|
</para>
|
|
<programlisting role="php">
|
|
<![CDATA[
|
|
<?php
|
|
$database = 'SAMPLE';
|
|
$user = 'db2inst1';
|
|
$password = 'ibmdb2';
|
|
$options = array('autocommit' => DB2_AUTOCOMMIT_OFF);
|
|
|
|
$conn = db2_connect($database, $user, $password, $options);
|
|
|
|
if ($conn) {
|
|
echo "Connection succeeded.\n";
|
|
if (db2_autocommit($conn)) {
|
|
echo "Autocommit is on.\n";
|
|
}
|
|
else {
|
|
echo "Autocommit is off.\n";
|
|
}
|
|
db2_close($conn);
|
|
}
|
|
else {
|
|
echo "Connection failed.";
|
|
}
|
|
?>
|
|
]]>
|
|
</programlisting>
|
|
&example.outputs;
|
|
<screen>
|
|
<![CDATA[
|
|
Connection succeeded.
|
|
Autocommit is off.
|
|
]]>
|
|
</screen>
|
|
</example>
|
|
<example>
|
|
<title>i5/OS best performance</title>
|
|
<para>
|
|
To achieve best performance for your i5/OS ibm_db2 1.5.1 PHP application
|
|
use the default host, userid, and password for your
|
|
<function>db2_connect</function>.
|
|
</para>
|
|
<programlisting role="php">
|
|
<![CDATA[
|
|
<?php
|
|
$library = "ADC";
|
|
$i5 = db2_connect("", "", "", array("i5_lib"=>"qsys2"));
|
|
$result = db2_exec($i5,
|
|
"select * from systables where table_schema = '$library'");
|
|
while ($row = db2_fetch_both($result)) {
|
|
echo $row['TABLE_NAME']."</br>";
|
|
}
|
|
db2_close($i5);
|
|
?>
|
|
]]>
|
|
</programlisting>
|
|
&example.outputs;
|
|
<screen>
|
|
<![CDATA[
|
|
ANIMALS
|
|
NAMES
|
|
PICTURES
|
|
]]>
|
|
</screen>
|
|
</example>
|
|
<example>
|
|
<title>Using trusted context</title>
|
|
<para>
|
|
The following example shows how to enable trusted context, switch
|
|
users, and get the current user ID.
|
|
</para>
|
|
<programlisting role="php">
|
|
<![CDATA[
|
|
<?php
|
|
|
|
$database = "SAMPLE";
|
|
$hostname = "localhost";
|
|
$port = 50000;
|
|
$authID = "db2inst1";
|
|
$auth_pass = "ibmdb2";
|
|
|
|
$tc_user = "tcuser";
|
|
$tc_pass = "tcpassword";
|
|
|
|
$dsn = "DATABASE=$database;HOSTNAME=$hostname;PORT=$port;
|
|
PROTOCOL=TCPIP;UID=$authID;PWD=$auth_pass;";
|
|
$options = array ("trustedcontext" => DB2_TRUSTED_CONTEXT_ENABLE);
|
|
|
|
$tc_conn = db2_connect($dsn, "", "", $options);
|
|
if($tc_conn) {
|
|
echo "Explicit trusted connection succeeded.\n";
|
|
|
|
if(db2_get_option($tc_conn, "trustedcontext")) {
|
|
$userBefore = db2_get_option($tc_conn, "trusted_user");
|
|
|
|
//Do some work as user 1.
|
|
|
|
//Switching to trusted user.
|
|
$parameters = array("trusted_user" => $tc_user,
|
|
"trusted_password" => $tcuser_pass);
|
|
$res = db2_set_option ($tc_conn, $parameters, 1);
|
|
|
|
$userAfter = db2_get_option($tc_conn, "trusted_user");
|
|
//Do more work as trusted user.
|
|
|
|
if($userBefore != $userAfter) {
|
|
echo "User has been switched." . "\n";
|
|
}
|
|
}
|
|
|
|
db2_close($tc_conn);
|
|
}
|
|
else {
|
|
echo "Explicit trusted connection failed.\n";
|
|
}
|
|
?>
|
|
|
|
]]>
|
|
</programlisting>
|
|
&example.outputs;
|
|
<screen>
|
|
<![CDATA[
|
|
Explicit trusted connection succeeded.
|
|
User has been switched.
|
|
]]>
|
|
</screen>
|
|
</example>
|
|
</para>
|
|
</refsect1>
|
|
|
|
<refsect1 role="seealso">
|
|
&reftitle.seealso;
|
|
<para>
|
|
<simplelist>
|
|
<member><function>db2_close</function></member>
|
|
<member><function>db2_pconnect</function></member>
|
|
</simplelist>
|
|
</para>
|
|
</refsect1>
|
|
|
|
|
|
</refentry>
|
|
|
|
<!-- Keep this comment at the end of the file
|
|
Local variables:
|
|
mode: sgml
|
|
sgml-omittag:t
|
|
sgml-shorttag:t
|
|
sgml-minimize-attributes:nil
|
|
sgml-always-quote-attributes:t
|
|
sgml-indent-step:1
|
|
sgml-indent-data:t
|
|
indent-tabs-mode:nil
|
|
sgml-parent-document:nil
|
|
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
|
|
sgml-exposed-tags:nil
|
|
sgml-local-catalogs:nil
|
|
sgml-local-ecat-files:nil
|
|
End:
|
|
vim600: syn=xml fen fdm=syntax fdl=2 si
|
|
vim: et tw=78 syn=sgml
|
|
vi: ts=1 sw=1
|
|
-->
|