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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Db
* @subpackage Adapter
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Db2.php 20096 2010-01-06 02:05:09Z bkarwin $
*/
/** @see Zend_Db_Adapter_Pdo_Ibm */
// require_once 'Zend/Db/Adapter/Pdo/Ibm.php';
/** @see Zend_Db_Statement_Pdo_Ibm */
// require_once 'Zend/Db/Statement/Pdo/Ibm.php';
/**
* @category Zend
* @package Zend_Db
* @subpackage Adapter
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Db_Adapter_Pdo_Ibm_Db2
{
/**
* @var Zend_Db_Adapter_Abstract
*/
protected $_adapter = null;
/**
* Construct the data server class.
*
* It will be used to generate non-generic SQL
* for a particular data server
*
* @param Zend_Db_Adapter_Abstract $adapter
*/
public function __construct($adapter)
{
$this->_adapter = $adapter;
}
/**
* Returns a list of the tables in the database.
*
* @return array
*/
public function listTables()
{
$sql = "SELECT tabname "
. "FROM SYSCAT.TABLES ";
return $this->_adapter->fetchCol($sql);
}
/**
* DB2 catalog lookup for describe table
*
* @param string $tableName
* @param string $schemaName OPTIONAL
* @return array
*/
public function describeTable($tableName, $schemaName = null)
{
$sql = "SELECT DISTINCT c.tabschema, c.tabname, c.colname, c.colno,
c.typename, c.default, c.nulls, c.length, c.scale,
c.identity, tc.type AS tabconsttype, k.colseq
FROM syscat.columns c
LEFT JOIN (syscat.keycoluse k JOIN syscat.tabconst tc
ON (k.tabschema = tc.tabschema
AND k.tabname = tc.tabname
AND tc.type = 'P'))
ON (c.tabschema = k.tabschema
AND c.tabname = k.tabname
AND c.colname = k.colname)
WHERE "
. $this->_adapter->quoteInto('UPPER(c.tabname) = UPPER(?)', $tableName);
if ($schemaName) {
$sql .= $this->_adapter->quoteInto(' AND UPPER(c.tabschema) = UPPER(?)', $schemaName);
}
$sql .= " ORDER BY c.colno";
$desc = array();
$stmt = $this->_adapter->query($sql);
/**
* To avoid case issues, fetch using FETCH_NUM
*/
$result = $stmt->fetchAll(Zend_Db::FETCH_NUM);
/**
* The ordering of columns is defined by the query so we can map
* to variables to improve readability
*/
$tabschema = 0;
$tabname = 1;
$colname = 2;
$colno = 3;
$typename = 4;
$default = 5;
$nulls = 6;
$length = 7;
$scale = 8;
$identityCol = 9;
$tabconstype = 10;
$colseq = 11;
foreach ($result as $key => $row) {
list ($primary, $primaryPosition, $identity) = array(false, null, false);
if ($row[$tabconstype] == 'P') {
$primary = true;
$primaryPosition = $row[$colseq];
}
/**
* In IBM DB2, an column can be IDENTITY
* even if it is not part of the PRIMARY KEY.
*/
if ($row[$identityCol] == 'Y') {
$identity = true;
}
$desc[$this->_adapter->foldCase($row[$colname])] = array(
'SCHEMA_NAME' => $this->_adapter->foldCase($row[$tabschema]),
'TABLE_NAME' => $this->_adapter->foldCase($row[$tabname]),
'COLUMN_NAME' => $this->_adapter->foldCase($row[$colname]),
'COLUMN_POSITION' => $row[$colno]+1,
'DATA_TYPE' => $row[$typename],
'DEFAULT' => $row[$default],
'NULLABLE' => (bool) ($row[$nulls] == 'Y'),
'LENGTH' => $row[$length],
'SCALE' => $row[$scale],
'PRECISION' => ($row[$typename] == 'DECIMAL' ? $row[$length] : 0),
'UNSIGNED' => false,
'PRIMARY' => $primary,
'PRIMARY_POSITION' => $primaryPosition,
'IDENTITY' => $identity
);
}
return $desc;
}
/**
* Adds a DB2-specific LIMIT clause to the SELECT statement.
*
* @param string $sql
* @param integer $count
* @param integer $offset OPTIONAL
* @throws Zend_Db_Adapter_Exception
* @return string
*/
public function limit($sql, $count, $offset = 0)
{
$count = intval($count);
if ($count < 0) {
/** @see Zend_Db_Adapter_Exception */
// require_once 'Zend/Db/Adapter/Exception.php';
throw new Zend_Db_Adapter_Exception("LIMIT argument count=$count is not valid");
} else {
$offset = intval($offset);
if ($offset < 0) {
/** @see Zend_Db_Adapter_Exception */
// require_once 'Zend/Db/Adapter/Exception.php';
throw new Zend_Db_Adapter_Exception("LIMIT argument offset=$offset is not valid");
}
if ($offset == 0 && $count > 0) {
$limit_sql = $sql . " FETCH FIRST $count ROWS ONLY";
return $limit_sql;
}
/**
* DB2 does not implement the LIMIT clause as some RDBMS do.
* We have to simulate it with subqueries and ROWNUM.
* Unfortunately because we use the column wildcard "*",
* this puts an extra column into the query result set.
*/
$limit_sql = "SELECT z2.*
FROM (
SELECT ROW_NUMBER() OVER() AS \"ZEND_DB_ROWNUM\", z1.*
FROM (
" . $sql . "
) z1
) z2
WHERE z2.zend_db_rownum BETWEEN " . ($offset+1) . " AND " . ($offset+$count);
}
return $limit_sql;
}
/**
* DB2-specific last sequence id
*
* @param string $sequenceName
* @return integer
*/
public function lastSequenceId($sequenceName)
{
$sql = 'SELECT PREVVAL FOR '.$this->_adapter->quoteIdentifier($sequenceName).' AS VAL FROM SYSIBM.SYSDUMMY1';
$value = $this->_adapter->fetchOne($sql);
return $value;
}
/**
* DB2-specific sequence id value
*
* @param string $sequenceName
* @return integer
*/
public function nextSequenceId($sequenceName)
{
$sql = 'SELECT NEXTVAL FOR '.$this->_adapter->quoteIdentifier($sequenceName).' AS VAL FROM SYSIBM.SYSDUMMY1';
$value = $this->_adapter->fetchOne($sql);
return $value;
}
}
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