229 lines
7.4 KiB
PHP
229 lines
7.4 KiB
PHP
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Db
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* @subpackage Adapter
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* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id: Db2.php 9101 2008-03-30 19:54:38Z thomas $
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*/
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/** @see Zend_Db_Adapter_Pdo_Ibm */
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require_once 'Zend/Db/Adapter/Pdo/Ibm.php';
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/** @see Zend_Db_Statement_Pdo_Ibm */
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require_once 'Zend/Db/Statement/Pdo/Ibm.php';
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/**
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* @category Zend
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* @package Zend_Db
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* @subpackage Adapter
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* @copyright Copyright (c) 2005-2008 Zend Technologies Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Db_Adapter_Pdo_Ibm_Db2
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{
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/**
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* @var Zend_Db_Adapter_Abstract
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*/
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protected $_adapter = null;
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/**
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* Construct the data server class.
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*
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* It will be used to generate non-generic SQL
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* for a particular data server
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*
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* @param Zend_Db_Adapter_Abstract $adapter
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*/
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public function __construct($adapter)
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{
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$this->_adapter = $adapter;
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}
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/**
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* Returns a list of the tables in the database.
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*
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* @return array
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*/
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public function listTables()
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{
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$sql = "SELECT tabname "
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. "FROM SYSCAT.TABLES ";
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return $this->_adapter->fetchCol($sql);
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}
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/**
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* DB2 catalog lookup for describe table
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*
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* @param string $tableName
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* @param string $schemaName OPTIONAL
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* @return array
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*/
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public function describeTable($tableName, $schemaName = null)
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{
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$sql = "SELECT DISTINCT c.tabschema, c.tabname, c.colname, c.colno,
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c.typename, c.default, c.nulls, c.length, c.scale,
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c.identity, tc.type AS tabconsttype, k.colseq
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FROM syscat.columns c
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LEFT JOIN (syscat.keycoluse k JOIN syscat.tabconst tc
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ON (k.tabschema = tc.tabschema
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AND k.tabname = tc.tabname
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AND tc.type = 'P'))
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ON (c.tabschema = k.tabschema
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AND c.tabname = k.tabname
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AND c.colname = k.colname)
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WHERE "
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. $this->_adapter->quoteInto('UPPER(c.tabname) = UPPER(?)', $tableName);
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if ($schemaName) {
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$sql .= $this->_adapter->quoteInto(' AND UPPER(c.tabschema) = UPPER(?)', $schemaName);
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}
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$sql .= " ORDER BY c.colno";
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$desc = array();
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$stmt = $this->_adapter->query($sql);
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/**
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* To avoid case issues, fetch using FETCH_NUM
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*/
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$result = $stmt->fetchAll(Zend_Db::FETCH_NUM);
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/**
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* The ordering of columns is defined by the query so we can map
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* to variables to improve readability
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*/
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$tabschema = 0;
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$tabname = 1;
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$colname = 2;
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$colno = 3;
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$typename = 4;
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$default = 5;
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$nulls = 6;
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$length = 7;
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$scale = 8;
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$identityCol = 9;
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$tabconstype = 10;
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$colseq = 11;
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foreach ($result as $key => $row) {
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list ($primary, $primaryPosition, $identity) = array(false, null, false);
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if ($row[$tabconstype] == 'P') {
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$primary = true;
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$primaryPosition = $row[$colseq];
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}
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/**
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* In IBM DB2, an column can be IDENTITY
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* even if it is not part of the PRIMARY KEY.
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*/
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if ($row[$identityCol] == 'Y') {
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$identity = true;
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}
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$desc[$this->_adapter->foldCase($row[$colname])] = array(
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'SCHEMA_NAME' => $this->_adapter->foldCase($row[$tabschema]),
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'TABLE_NAME' => $this->_adapter->foldCase($row[$tabname]),
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'COLUMN_NAME' => $this->_adapter->foldCase($row[$colname]),
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'COLUMN_POSITION' => $row[$colno]+1,
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'DATA_TYPE' => $row[$typename],
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'DEFAULT' => $row[$default],
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'NULLABLE' => (bool) ($row[$nulls] == 'Y'),
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'LENGTH' => $row[$length],
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'SCALE' => $row[$scale],
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'PRECISION' => ($row[$typename] == 'DECIMAL' ? $row[$length] : 0),
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'UNSIGNED' => false,
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'PRIMARY' => $primary,
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'PRIMARY_POSITION' => $primaryPosition,
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'IDENTITY' => $identity
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);
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}
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return $desc;
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}
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/**
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* Adds a DB2-specific LIMIT clause to the SELECT statement.
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*
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* @param string $sql
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* @param integer $count
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* @param integer $offset OPTIONAL
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* @throws Zend_Db_Adapter_Exception
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* @return string
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*/
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public function limit($sql, $count, $offset = 0)
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{
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$count = intval($count);
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if ($count < 0) {
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/** @see Zend_Db_Adapter_Exception */
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require_once 'Zend/Db/Adapter/Exception.php';
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throw new Zend_Db_Adapter_Exception("LIMIT argument count=$count is not valid");
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} else {
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$offset = intval($offset);
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if ($offset < 0) {
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/** @see Zend_Db_Adapter_Exception */
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require_once 'Zend/Db/Adapter/Exception.php';
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throw new Zend_Db_Adapter_Exception("LIMIT argument offset=$offset is not valid");
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}
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if ($offset == 0 && $count > 0) {
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$limit_sql = $sql . " FETCH FIRST $count ROWS ONLY";
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return $limit_sql;
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}
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/**
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* DB2 does not implement the LIMIT clause as some RDBMS do.
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* We have to simulate it with subqueries and ROWNUM.
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* Unfortunately because we use the column wildcard "*",
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* this puts an extra column into the query result set.
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*/
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$limit_sql = "SELECT z2.*
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FROM (
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SELECT ROW_NUMBER() OVER() AS \"ZEND_DB_ROWNUM\", z1.*
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FROM (
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" . $sql . "
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) z1
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) z2
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WHERE z2.zend_db_rownum BETWEEN " . ($offset+1) . " AND " . ($offset+$count);
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}
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return $limit_sql;
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}
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/**
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* DB2-specific last sequence id
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*
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* @param string $sequenceName
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* @return integer
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*/
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public function lastSequenceId($sequenceName)
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{
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$sql = 'SELECT PREVVAL FOR '.$this->_adapter->quoteIdentifier($sequenceName).' AS VAL FROM SYSIBM.SYSDUMMY1';
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$value = $this->_adapter->fetchOne($sql);
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return $value;
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}
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/**
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* DB2-specific sequence id value
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*
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* @param string $sequenceName
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* @return integer
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*/
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public function nextSequenceId($sequenceName)
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{
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$sql = 'SELECT NEXTVAL FOR '.$this->_adapter->quoteIdentifier($sequenceName).' AS VAL FROM SYSIBM.SYSDUMMY1';
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$value = $this->_adapter->fetchOne($sql);
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return $value;
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}
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}
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