Db2.php

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<?php
#require_once 'Zend/Db/Adapter/Pdo/Ibm.php';

#require_once 'Zend/Db/Statement/Pdo/Ibm.php';


class Zend_Db_Adapter_Pdo_Ibm_Db2
{
    protected $_adapter = null;

    public function __construct($adapter)
    {
        $this->_adapter = $adapter;
    }

    public function listTables()
    {
        $sql = "SELECT tabname "
        . "FROM SYSCAT.TABLES ";
        return $this->_adapter->fetchCol($sql);
    }

    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);

        $result = $stmt->fetchAll(Zend_Db::FETCH_NUM);

        $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];
            }
            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;
    }

    public function limit($sql, $count, $offset = 0)
    {
        $count = intval($count);
        if ($count < 0) {
            #require_once 'Zend/Db/Adapter/Exception.php';
            throw new Zend_Db_Adapter_Exception("LIMIT argument count=$count is not valid");
        } else {
            $offset = intval($offset);
            if ($offset < 0) {
                #require_once 'Zend/Db/Adapter/Exception.php';
                throw new Zend_Db_Adapter_Exception("LIMIT argument offset=$offset is not valid");
            }

            if ($offset == 0 && $count > 0) {
                $limit_sql = $sql . " FETCH FIRST $count ROWS ONLY";
                return $limit_sql;
            }
            $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;
    }

    public function lastSequenceId($sequenceName)
    {
        $sql = 'SELECT PREVVAL FOR '.$this->_adapter->quoteIdentifier($sequenceName).' AS VAL FROM SYSIBM.SYSDUMMY1';
        $value = $this->_adapter->fetchOne($sql);
        return $value;
    }

    public function nextSequenceId($sequenceName)
    {
        $sql = 'SELECT NEXTVAL FOR '.$this->_adapter->quoteIdentifier($sequenceName).' AS VAL FROM SYSIBM.SYSDUMMY1';
        $value = $this->_adapter->fetchOne($sql);
        return $value;
    }
}