Mssql.php

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


class Zend_Db_Adapter_Pdo_Mssql extends Zend_Db_Adapter_Pdo_Abstract
{
    protected $_pdoType = 'mssql';

    protected $_numericDataTypes = array(
        Zend_Db::INT_TYPE    => Zend_Db::INT_TYPE,
        Zend_Db::BIGINT_TYPE => Zend_Db::BIGINT_TYPE,
        Zend_Db::FLOAT_TYPE  => Zend_Db::FLOAT_TYPE,
        'INT'                => Zend_Db::INT_TYPE,
        'SMALLINT'           => Zend_Db::INT_TYPE,
        'TINYINT'            => Zend_Db::INT_TYPE,
        'BIGINT'             => Zend_Db::BIGINT_TYPE,
        'DECIMAL'            => Zend_Db::FLOAT_TYPE,
        'FLOAT'              => Zend_Db::FLOAT_TYPE,
        'MONEY'              => Zend_Db::FLOAT_TYPE,
        'NUMERIC'            => Zend_Db::FLOAT_TYPE,
        'REAL'               => Zend_Db::FLOAT_TYPE,
        'SMALLMONEY'         => Zend_Db::FLOAT_TYPE
    );

    protected function _dsn()
    {
        // baseline of DSN parts
        $dsn = $this->_config;

        // don't pass the username and password in the DSN
        unset($dsn['username']);
        unset($dsn['password']);
        unset($dsn['options']);
        unset($dsn['persistent']);
        unset($dsn['driver_options']);

        if (isset($dsn['port'])) {
            $seperator = ':';
            if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
                $seperator = ',';
            }
            $dsn['host'] .= $seperator . $dsn['port'];
            unset($dsn['port']);
        }

        // this driver supports multiple DSN prefixes
        // @see http://www.php.net/manual/en/ref.pdo-dblib.connection.php
        if (isset($dsn['pdoType'])) {
            switch (strtolower($dsn['pdoType'])) {
                case 'freetds':
                case 'sybase':
                    $this->_pdoType = 'sybase';
                    break;
                case 'mssql':
                    $this->_pdoType = 'mssql';
                    break;
                case 'dblib':
                default:
                    $this->_pdoType = 'dblib';
                    break;
            }
            unset($dsn['pdoType']);
        }

        // use all remaining parts in the DSN
        foreach ($dsn as $key => $val) {
            $dsn[$key] = "$key=$val";
        }

        $dsn = $this->_pdoType . ':' . implode(';', $dsn);
        return $dsn;
    }

    protected function _connect()
    {
        if ($this->_connection) {
            return;
        }
        parent::_connect();
        $this->_connection->exec('SET QUOTED_IDENTIFIER ON');
    }

    protected function _beginTransaction()
    {
        $this->_connect();
        $this->_connection->exec('BEGIN TRANSACTION');
        return true;
    }

    protected function _commit()
    {
        $this->_connect();
        $this->_connection->exec('COMMIT TRANSACTION');
        return true;
    }

    protected function _rollBack() {
        $this->_connect();
        $this->_connection->exec('ROLLBACK TRANSACTION');
        return true;
    }

    public function listTables()
    {
        $sql = "SELECT name FROM sysobjects WHERE type = 'U' ORDER BY name";
        return $this->fetchCol($sql);
    }

    public function describeTable($tableName, $schemaName = null)
    {
        if ($schemaName != null) {
            if (strpos($schemaName, '.') !== false) {
                $result = explode('.', $schemaName);
                $schemaName = $result[1];
            }
        }
        $sql = "exec sp_columns @table_name = " . $this->quoteIdentifier($tableName, true);
        if ($schemaName != null) {
            $sql .= ", @table_owner = " . $this->quoteIdentifier($schemaName, true);
        }

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

        $table_name  = 2;
        $column_name = 3;
        $type_name   = 5;
        $precision   = 6;
        $length      = 7;
        $scale       = 8;
        $nullable    = 10;
        $column_def  = 12;
        $column_position = 16;

        $sql = "exec sp_pkeys @table_name = " . $this->quoteIdentifier($tableName, true);
        if ($schemaName != null) {
            $sql .= ", @table_owner = " . $this->quoteIdentifier($schemaName, true);
        }

        $stmt = $this->query($sql);
        $primaryKeysResult = $stmt->fetchAll(Zend_Db::FETCH_NUM);
        $primaryKeyColumn = array();
        $pkey_column_name = 3;
        $pkey_key_seq = 4;
        foreach ($primaryKeysResult as $pkeysRow) {
            $primaryKeyColumn[$pkeysRow[$pkey_column_name]] = $pkeysRow[$pkey_key_seq];
        }

        $desc = array();
        $p = 1;
        foreach ($result as $key => $row) {
            $identity = false;
            $words = explode(' ', $row[$type_name], 2);
            if (isset($words[0])) {
                $type = $words[0];
                if (isset($words[1])) {
                    $identity = (bool) preg_match('/identity/', $words[1]);
                }
            }

            $isPrimary = array_key_exists($row[$column_name], $primaryKeyColumn);
            if ($isPrimary) {
                $primaryPosition = $primaryKeyColumn[$row[$column_name]];
            } else {
                $primaryPosition = null;
            }

            $desc[$this->foldCase($row[$column_name])] = array(
                'SCHEMA_NAME'      => null, // @todo
                'TABLE_NAME'       => $this->foldCase($row[$table_name]),
                'COLUMN_NAME'      => $this->foldCase($row[$column_name]),
                'COLUMN_POSITION'  => (int) $row[$column_position],
                'DATA_TYPE'        => $type,
                'DEFAULT'          => $row[$column_def],
                'NULLABLE'         => (bool) $row[$nullable],
                'LENGTH'           => $row[$length],
                'SCALE'            => $row[$scale],
                'PRECISION'        => $row[$precision],
                'UNSIGNED'         => null, // @todo
                'PRIMARY'          => $isPrimary,
                '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");
        }

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

        $sql = preg_replace(
            '/^SELECT\s+(DISTINCT\s)?/i',
            'SELECT $1TOP ' . ($count+$offset) . ' ',
            $sql
            );

        if ($offset > 0) {
            $orderby = stristr($sql, 'ORDER BY');

            if ($orderby !== false) {
                $orderParts = explode(',', substr($orderby, 8));
                $pregReplaceCount = null;
                $orderbyInverseParts = array();
                foreach ($orderParts as $orderPart) {
                    $orderPart = rtrim($orderPart);
                    $inv = preg_replace('/\s+desc$/i', ' ASC', $orderPart, 1, $pregReplaceCount);
                    if ($pregReplaceCount) {
                        $orderbyInverseParts[] = $inv;
                        continue;
                    }
                    $inv = preg_replace('/\s+asc$/i', ' DESC', $orderPart, 1, $pregReplaceCount);
                    if ($pregReplaceCount) {
                        $orderbyInverseParts[] = $inv;
                        continue;
                    } else {
                        $orderbyInverseParts[] = $orderPart . ' DESC';
                    }
                }

                $orderbyInverse = 'ORDER BY ' . implode(', ', $orderbyInverseParts);
            }




            $sql = 'SELECT * FROM (SELECT TOP ' . $count . ' * FROM (' . $sql . ') AS inner_tbl';
            if ($orderby !== false) {
                $sql .= ' ' . $orderbyInverse . ' ';
            }
            $sql .= ') AS outer_tbl';
            if ($orderby !== false) {
                $sql .= ' ' . $orderby;
            }
        }

        return $sql;
    }

    public function lastInsertId($tableName = null, $primaryKey = null)
    {
        $sql = 'SELECT SCOPE_IDENTITY()';
        return (int)$this->fetchOne($sql);
    }

    public function getServerVersion()
    {
        try {
            $stmt = $this->query("SELECT CAST(SERVERPROPERTY('productversion') AS VARCHAR)");
            $result = $stmt->fetchAll(Zend_Db::FETCH_NUM);
            if (count($result)) {
                return $result[0][0];
            }
            return null;
        } catch (PDOException $e) {
            return null;
        }
    }

    protected function _quote($value)
    {
        if (!is_int($value) && !is_float($value)) {
            // Fix for null-byte injection
            $value = addcslashes($value, "\000\032");
        }
        return parent::_quote($value);
    }
}