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313 lines
7.4 KiB
PHP
313 lines
7.4 KiB
PHP
<?php
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/*
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V4.22 15 Apr 2004 (c) 2000-2004 John Lim (jlim@natsoft.com.my). All rights reserved.
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Released under both BSD license and Lesser GPL library license.
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Whenever there is any discrepancy between the two licenses,
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the BSD license will take precedence.
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Set tabs to 4 for best viewing.
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Latest version is available at http://php.weblogs.com/
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DB2 data driver. Requires ODBC.
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From phpdb list:
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Hi Andrew,
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thanks a lot for your help. Today we discovered what
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our real problem was:
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After "playing" a little bit with the php-scripts that try
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to connect to the IBM DB2, we set the optional parameter
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Cursortype when calling odbc_pconnect(....).
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And the exciting thing: When we set the cursor type
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to SQL_CUR_USE_ODBC Cursor Type, then
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the whole query speed up from 1 till 10 seconds
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to 0.2 till 0.3 seconds for 100 records. Amazing!!!
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Therfore, PHP is just almost fast as calling the DB2
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from Servlets using JDBC (don't take too much care
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about the speed at whole: the database was on a
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completely other location, so the whole connection
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was made over a slow network connection).
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I hope this helps when other encounter the same
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problem when trying to connect to DB2 from
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PHP.
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Kind regards,
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Christian Szardenings
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2 Oct 2001
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Mark Newnham has discovered that the SQL_CUR_USE_ODBC is not supported by
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IBM's DB2 ODBC driver, so this must be a 3rd party ODBC driver.
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From the IBM CLI Reference:
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SQL_ATTR_ODBC_CURSORS (DB2 CLI v5)
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This connection attribute is defined by ODBC, but is not supported by DB2
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CLI. Any attempt to set or get this attribute will result in an SQLSTATE of
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HYC00 (Driver not capable).
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A 32-bit option specifying how the Driver Manager uses the ODBC cursor
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library.
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So I guess this means the message [above] was related to using a 3rd party
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odbc driver.
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Setting SQL_CUR_USE_ODBC
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========================
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To set SQL_CUR_USE_ODBC for drivers that require it, do this:
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$db = NewADOConnection('db2');
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$db->curMode = SQL_CUR_USE_ODBC;
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$db->Connect($dsn, $userid, $pwd);
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USING CLI INTERFACE
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===================
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I have had reports that the $host and $database params have to be reversed in
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Connect() when using the CLI interface. From Halmai Csongor csongor.halmai#nexum.hu:
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> The symptom is that if I change the database engine from postgres or any other to DB2 then the following
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> connection command becomes wrong despite being described this version to be correct in the docs.
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>
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> $connection_object->Connect( $DATABASE_HOST, $DATABASE_AUTH_USER_NAME, $DATABASE_AUTH_PASSWORD, $DATABASE_NAME )
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>
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> In case of DB2 I had to swap the first and last arguments in order to connect properly.
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*/
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if (!defined('_ADODB_ODBC_LAYER')) {
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include(ADODB_DIR."/drivers/adodb-odbc.inc.php");
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}
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if (!defined('ADODB_DB2')){
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define('ADODB_DB2',1);
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class ADODB_DB2 extends ADODB_odbc {
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var $databaseType = "db2";
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var $concat_operator = '||';
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var $sysDate = 'CURRENT_DATE';
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var $sysTimeStamp = 'CURRENT TIMESTAMP';
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// The complete string representation of a timestamp has the form
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// yyyy-mm-dd-hh.mm.ss.nnnnnn.
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var $fmtTimeStamp = "'Y-m-d-H.i.s'";
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var $ansiOuter = true;
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var $identitySQL = 'values IDENTITY_VAL_LOCAL()';
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var $_bindInputArray = false;
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var $upperCase = 'upper';
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function ADODB_DB2()
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{
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if (strncmp(PHP_OS,'WIN',3) === 0) $this->curmode = SQL_CUR_USE_ODBC;
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$this->ADODB_odbc();
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}
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function IfNull( $field, $ifNull )
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{
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return " COALESCE($field, $ifNull) "; // if DB2 UDB
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}
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function ServerInfo()
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{
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//odbc_setoption($this->_connectionID,1,101 /*SQL_ATTR_ACCESS_MODE*/, 1 /*SQL_MODE_READ_ONLY*/);
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$vers = $this->GetOne('select versionnumber from sysibm.sysversions');
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//odbc_setoption($this->_connectionID,1,101, 0 /*SQL_MODE_READ_WRITE*/);
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return array('description'=>'DB2 ODBC driver', 'version'=>$vers);
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}
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function _insertid()
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{
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return $this->GetOne($this->identitySQL);
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}
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function RowLock($tables,$where)
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{
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if ($this->_autocommit) $this->BeginTrans();
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return $this->GetOne("select 1 as ignore from $tables where $where for update");
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}
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function &MetaTables($ttype=false,$showSchema=false)
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{
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global $ADODB_FETCH_MODE;
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$savem = $ADODB_FETCH_MODE;
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$ADODB_FETCH_MODE = ADODB_FETCH_NUM;
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$qid = odbc_tables($this->_connectionID);
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$rs = new ADORecordSet_odbc($qid);
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$ADODB_FETCH_MODE = $savem;
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if (!$rs) return false;
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$rs->_has_stupid_odbc_fetch_api_change = $this->_has_stupid_odbc_fetch_api_change;
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$arr =& $rs->GetArray();
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//print_r($arr);
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$rs->Close();
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$arr2 = array();
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if ($ttype) {
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$isview = strncmp($ttype,'V',1) === 0;
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}
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for ($i=0; $i < sizeof($arr); $i++) {
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if (!$arr[$i][2]) continue;
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if (strncmp($arr[$i][1],'SYS',3) === 0) continue;
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$type = $arr[$i][3];
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if ($showSchema) $arr[$i][2] = $arr[$i][1].'.'.$arr[$i][2];
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if ($ttype) {
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if ($isview) {
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if (strncmp($type,'V',1) === 0) $arr2[] = $arr[$i][2];
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} else if (strncmp($type,'T',1) === 0) $arr2[] = $arr[$i][2];
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} else if (strncmp($type,'S',1) !== 0) $arr2[] = $arr[$i][2];
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}
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return $arr2;
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}
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// Format date column in sql string given an input format that understands Y M D
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function SQLDate($fmt, $col=false)
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{
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// use right() and replace() ?
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if (!$col) $col = $this->sysDate;
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$s = '';
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$len = strlen($fmt);
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for ($i=0; $i < $len; $i++) {
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if ($s) $s .= '||';
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$ch = $fmt[$i];
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switch($ch) {
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case 'Y':
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case 'y':
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$s .= "char(year($col))";
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break;
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case 'M':
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$s .= "substr(monthname($col),1,3)";
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break;
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case 'm':
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$s .= "right(digits(month($col)),2)";
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break;
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case 'D':
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case 'd':
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$s .= "right(digits(day($col)),2)";
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break;
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case 'H':
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case 'h':
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if ($col != $this->sysDate) $s .= "right(digits(hour($col)),2)";
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else $s .= "''";
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break;
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case 'i':
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case 'I':
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if ($col != $this->sysDate)
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$s .= "right(digits(minute($col)),2)";
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else $s .= "''";
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break;
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case 'S':
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case 's':
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if ($col != $this->sysDate)
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$s .= "right(digits(second($col)),2)";
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else $s .= "''";
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break;
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default:
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if ($ch == '\\') {
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$i++;
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$ch = substr($fmt,$i,1);
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}
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$s .= $this->qstr($ch);
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}
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}
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return $s;
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}
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function &SelectLimit($sql,$nrows=-1,$offset=-1,$inputArr=false)
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{
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if ($offset <= 0) {
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// could also use " OPTIMIZE FOR $nrows ROWS "
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if ($nrows >= 0) $sql .= " FETCH FIRST $nrows ROWS ONLY ";
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$rs =& $this->Execute($sql,$inputArr);
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} else {
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if ($offset > 0 && $nrows < 0);
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else {
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$nrows += $offset;
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$sql .= " FETCH FIRST $nrows ROWS ONLY ";
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}
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$rs =& ADOConnection::SelectLimit($sql,-1,$offset,$inputArr);
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}
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return $rs;
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}
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};
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class ADORecordSet_db2 extends ADORecordSet_odbc {
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var $databaseType = "db2";
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function ADORecordSet_db2($id,$mode=false)
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{
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$this->ADORecordSet_odbc($id,$mode);
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}
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function MetaType($t,$len=-1,$fieldobj=false)
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{
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if (is_object($t)) {
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$fieldobj = $t;
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$t = $fieldobj->type;
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$len = $fieldobj->max_length;
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}
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switch (strtoupper($t)) {
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case 'VARCHAR':
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case 'CHAR':
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case 'CHARACTER':
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if ($len <= $this->blobSize) return 'C';
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case 'LONGCHAR':
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case 'TEXT':
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case 'CLOB':
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case 'DBCLOB': // double-byte
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return 'X';
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case 'BLOB':
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case 'GRAPHIC':
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case 'VARGRAPHIC':
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return 'B';
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case 'DATE':
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return 'D';
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case 'TIME':
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case 'TIMESTAMP':
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return 'T';
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//case 'BOOLEAN':
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//case 'BIT':
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// return 'L';
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//case 'COUNTER':
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// return 'R';
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case 'INT':
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case 'INTEGER':
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case 'BIGINT':
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case 'SMALLINT':
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return 'I';
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default: return 'N';
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}
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}
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}
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} //define
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?>
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