db2_connect

(PECL ibm_db2 >= 1.0.0)

db2_connect — Returns a connection to a database

Açıklama

db2_connect(
    string $database,
    ?string $username,
    ?string $password,
    array $options = []
): resource|false

Creates a new connection to an IBM DB2 Universal Database, IBM Cloudscape, or Apache Derby database.

Bağımsız Değişkenler

database

For a cataloged connection to a database, database represents the database alias in the DB2 client catalog.

For an uncataloged connection to a database, database represents a complete connection string in the following format:

DATABASE=database;HOSTNAME=hostname;PORT=port;PROTOCOL=TCPIP;UID=username;PWD=password;

Bilginize:
When connecting to Db2 on IBM i, the underlying system calls » SQLDriverConnect, which only accepts DSN, UID, and PWD for the » connection string. Like so:
DSN=database;UID=username;PWD=password;

where the parameters represent the following values:

database: The name of the database.
hostname: The hostname or IP address of the database server.
port: The TCP/IP port on which the database is listening for requests.
username: The username with which you are connecting to the database.
password: The password with which you are connecting to the database.

username

The username with which you are connecting to the database.

For uncataloged connections, you must pass a null value or empty string.

password

The password with which you are connecting to the database.

For uncataloged connections, you must pass a null value or empty string.

options

An associative array of connection options that affect the behavior of the connection, where valid array keys include:

autocommit

Passing the DB2_AUTOCOMMIT_ON value turns autocommit on for this connection handle.

Passing the DB2_AUTOCOMMIT_OFF value turns autocommit off for this connection handle.

DB2_ATTR_CASE

Passing the DB2_CASE_NATURAL value specifies that column names are returned in natural case.

Passing the DB2_CASE_LOWER value specifies that column names are returned in lower case.

Passing the DB2_CASE_UPPER value specifies that column names are returned in upper case.

CURSOR

Passing the DB2_FORWARD_ONLY value specifies a forward-only cursor for a statement resource. This is the default cursor type and is supported on all database servers.

Passing the DB2_SCROLLABLE value specifies a scrollable cursor for a statement resource. This mode enables random access to rows in a result set, but currently is supported only by IBM DB2 Universal Database.

The following new option is available in ibm_db2 version 1.7.0 and later.

trustedcontext

Passing the DB2_TRUSTED_CONTEXT_ENABLE value turns trusted context on for this connection handle. This parameter cannot be set using db2_set_option().

This key works only if the database is cataloged (even if the database is local), or if you specify the full DSN when you create the connection.

To catalog the database, use following commands:

db2 catalog tcpip node loopback remote <SERVERNAME> server <SERVICENAME>
db2 catalog database <LOCALDBNAME> as <REMOTEDBNAME> at node loopback
db2 "update dbm cfg using svcename <SERVICENAME>"
db2set DB2COMM=TCPIP

The following new i5/OS options are available in ibm_db2 version 1.5.1 and later.

i5_lib

A character value that indicates the default library that will be used for resolving unqualified file references. This is not valid if the connection is using system naming mode.

i5_naming

DB2_I5_NAMING_ON value turns on DB2 UDB CLI iSeries system naming mode. Files are qualified using the slash (/) delimiter. Unqualified files are resolved using the library list for the job.

DB2_I5_NAMING_OFF value turns off DB2 UDB CLI default naming mode, which is SQL naming. Files are qualified using the period (.) delimiter. Unqualified files are resolved using either the default library or the current user ID.

i5_commit

The i5_commit attribute should be set before the db2_connect(). If the value is changed after the connection has been established, and the connection is to a remote data source, the change does not take effect until the next successful db2_connect() for the connection handle.

Bilginize:
The php.ini setting ibm_db2.i5_allow_commit==0 or DB2_I5_TXN_NO_COMMIT is the default, but may be overridden with the i5_commit option.

DB2_I5_TXN_NO_COMMIT - Commitment control is not used.

DB2_I5_TXN_READ_UNCOMMITTED - Dirty reads, nonrepeatable reads, and phantoms are possible.

DB2_I5_TXN_READ_COMMITTED - Dirty reads are not possible. Nonrepeatable reads, and phantoms are possible.

DB2_I5_TXN_REPEATABLE_READ - Dirty reads and nonrepeatable reads are not possible. Phantoms are possible.

DB2_I5_TXN_SERIALIZABLE - Transactions are serializable. Dirty reads, non-repeatable reads, and phantoms are not possible

i5_query_optimize

DB2_FIRST_IO All queries are optimized with the goal of returning the first page of output as fast as possible. This goal works well when the output is controlled by a user who is most likely to cancel the query after viewing the first page of output data. Queries coded with an OPTIMIZE FOR nnn ROWS clause honor the goal specified by the clause.

DB2_ALL_IO All queries are optimized with the goal of running the entire query to completion in the shortest amount of elapsed time. This is a good option when the output of a query is being written to a file or report, or the interface is queuing the output data. Queries coded with an OPTIMIZE FOR nnn ROWS clause honor the goal specified by the clause. This is the default.

i5_dbcs_alloc

DB2_I5_DBCS_ALLOC_ON value turns on DB2 6X allocation scheme for DBCS translation column size growth.

DB2_I5_DBCS_ALLOC_OFF value turns off DB2 6X allocation scheme for DBCS translation column size growth.

Note: php.ini setting ibm_db2.i5_dbcs_alloc==0 or DB2_I5_DBCS_ALLOC_OFF is the default, but may be overridden with the i5_dbcs_alloc option.

i5_date_fmt

DB2_I5_FMT_ISO - The International Organization for Standardization (ISO) date format yyyy-mm-dd is used. This is the default.

DB2_I5_FMT_USA - The United States date format mm/dd/yyyy is used.

DB2_I5_FMT_EUR - The European date format dd.mm.yyyy is used.

DB2_I5_FMT_JIS - The Japanese Industrial Standard date format yyyy-mm-dd is used.

DB2_I5_FMT_MDY - The date format mm/dd/yyyy is used.

DB2_I5_FMT_DMY - The date format dd/mm/yyyy is used.

DB2_I5_FMT_YMD - The date format yy/mm/dd is used.

DB2_I5_FMT_JUL - The Julian date format yy/ddd is used.

DB2_I5_FMT_JOB - The job default is used.

i5_date_sep

DB2_I5_SEP_SLASH - A slash ( / ) is used as the date separator. This is the default.

DB2_I5_SEP_DASH - A dash ( - ) is used as the date separator.

DB2_I5_SEP_PERIOD - A period ( . ) is used as the date separator.

DB2_I5_SEP_COMMA - A comma ( , ) is used as the date separator.

DB2_I5_SEP_BLANK - A blank is used as the date separator.

DB2_I5_SEP_JOB - The job default is used

i5_time_fmt

DB2_I5_FMT_ISO - The International Organization for Standardization (ISO) time format hh.mm.ss is used. This is the default.

DB2_I5_FMT_USA - The United States time format hh:mmxx is used, where xx is AM or PM.

DB2_I5_FMT_EUR - The European time format hh.mm.ss is used.

DB2_I5_FMT_JIS - The Japanese Industrial Standard time format hh:mm:ss is used.

DB2_I5_FMT_HMS - The hh:mm:ss format is used.

i5_time_sep

DB2_I5_SEP_COLON - A colon ( : ) is used as the time separator. This is the default.

DB2_I5_SEP_PERIOD - A period ( . ) is used as the time separator.

DB2_I5_SEP_COMMA - A comma ( , ) is used as the time separator.

DB2_I5_SEP_BLANK - A blank is used as the time separator.

DB2_I5_SEP_JOB - The job default is used.

i5_decimal_sep

DB2_I5_SEP_PERIOD - A period ( . ) is used as the decimal separator. This is the default.

DB2_I5_SEP_COMMA - A comma ( , ) is used as the decimal separator.

DB2_I5_SEP_JOB - The job default is used.

The following new i5/OS option is available in ibm_db2 version 1.8.0 and later.

i5_libl: A character value that indicates the library list that will be used for resolving unqualified file references. Specify the library list elements separated by blanks 'i5_libl'=>"MYLIB YOURLIB ANYLIB".

Bilginize:
i5_libl calls qsys2/qcmdexc('cmd',cmdlen), which is only available in i5/OS V5R4 and later.

Dönen Değerler

Returns a connection handle resource if the connection attempt is successful. If the connection attempt fails, db2_connect() returns false.

Örnekler

Örnek 1 Creating a cataloged connection

Cataloged connections require you to have previously cataloged the target database through the DB2 Command Line Processor (CLP) or DB2 Configuration Assistant.

<?php
$database = 'SAMPLE';
$user = 'db2inst1';
$password = 'ibmdb2';

$conn = db2_connect($database, $user, $password);

if ($conn) {
    echo "Connection succeeded.";
    db2_close($conn);
}
else {
    echo "Connection failed.";
}
?>

Yukarıdaki örneğin çıktısı:

Connection succeeded.

Örnek 2 Creating an uncataloged connection

An uncataloged connection enables you to dynamically connect to a database.

<?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.";
}
?>

Yukarıdaki örneğin çıktısı:

Connection succeeded.

Örnek 3 Creating a connection with autocommit off by default

Passing an array of options to db2_connect() enables you to modify the default behavior of the connection handle.

<?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.";
}
?>

Yukarıdaki örneğin çıktısı:

Connection succeeded.
Autocommit is off.

Örnek 4 i5/OS best performance

To achieve best performance for your i5/OS ibm_db2 1.5.1 PHP application use the default host, userid, and password for your db2_connect().

<?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);
?>

Yukarıdaki örneğin çıktısı:

ANIMALS
NAMES
PICTURES

Örnek 5 Using trusted context

The following example shows how to enable trusted context, switch users, and get the current user ID.

<?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";
}
?>

Yukarıdaki örneğin çıktısı:

Explicit trusted connection succeeded.
User has been switched.

Ayrıca Bakınız

db2_close() - Closes a database connection
db2_pconnect() - Returns a persistent connection to a database

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User Contributed Notes 1 note

down

d dot lanza38 at gmail dot com ¶

9 years ago

As of 09/29/2015 when using the ibm_db2 driver and specifying an invalid library list with the 'i5_libl' option, the connection will be successfully created but with a default library list.  What happens is the connection is made and THEN the library list is attempted to be changed.  The connection will be a success but the library list change will fail without "db2_conn_error()" or "db2_conn_errormsg()" reporting anything and a default library list will be used.  However, "db2_stmt_error()" and "db2_stmt_errormsg()" will register with a value.  Also if error reporting is enable, the warning will be output to the screen.  This is not a bug, rather intended behavior according to Zend (I opened a ticked) and depending on which library list is used/swapped could lead to major problems (development VS production).  I stumbled upon this behavior when an anomaly (which I still can't explain) was imploding my library list with the character 'Z'.  I realized I was in my development environment but accessing production data as a result.  Going forward I will make sure to add this additional check for good measure.

See below to recreate behavior:

<?php
ini_set("display_errors", 1);

$systemName = 'systemName';
$userID = 'userName';
$password = 'password';

$options['i5_libl'] = implode('Z', array(
        'INVALID',        
    'LIB',       
    'LIST',   
    'IMPLODED',  
    'WITH',   
    'THE',      
    'LETTER',       
    'Z'
    ));

$options['i5_naming'] = DB2_I5_NAMING_ON;

$conn = db2_connect($systemName, $userID, $password, $options);
//This line causes "ini_set("display_errors", 1)" to dislay this warning on the screen:
//Warning: db2_connect(): Statement Execute Failed in /PATH/TO/FILE/test.php on line 58

if (db2_stmt_error()) { //Evaluates to true
    echo "error ID: " . (db2_stmt_error()); //Displays error code: 38501
    echo "<br>error message: " . (db2_stmt_errormsg()); //Displays: Trigger program or external routine detected an error. SQLCODE=-443
}

echo "<br />|".db2_conn_error()." ||| ".db2_conn_errormsg()."|<br />"; //Only "| ||| |" is displayed
print_r($conn); //A resource ID is displayed
echo "<br />";

if(isset($conn) && $conn === true){
    echo "Boolean true<br />";
    //never executes, but not expected since either false or a resource ID should be returned.
    //Plus it is clear $conn contains a resource ID from above.
}
if(isset($conn) && $conn == true){
    echo "Non-Boolean true 2<br />"; 
    //This always executes regardless of an accurate library list or not
    //I suppose "if($conn)" would evaluate to non-boolean true so this makes sense.
}
if(isset($conn) && $conn == "true"){
    echo "String true";
    //Never executes, but not expected.
}
if(isset($conn) && $conn === false){
    echo "Boolean false<br />";
    //never executes because the connection itself was a success.
    //If invalid credentials were provided this executes.
}
if(isset($conn) && $conn == false){
    echo "Non-Boolean false 2<br />";
    //never executes because the connection itself was a success.
    //Added this here because I was unsure if a boolean false would be returned or not.
    //If invalid credentials were provided this executes as well.
}
if(isset($conn) && $conn == "false"){
    echo "String false";
    //never executes because the connection itself was a success.
    //Added this here because I was unsure if a String "false" would be returned
}
?>

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